From 3ce7f701c22d3fd0a40be35e6a6ea198d8010fb2 Mon Sep 17 00:00:00 2001
From: "W. Trevor King" <wking@drexel.edu>
Date: Thu, 12 Apr 2012 00:01:22 -0400
Subject: [PATCH] Assorted changes to get problems working with new, flexible
 labels.

---
 latex/problems/Giancoli_6/problem19.24.tex    | 15 ++++---
 latex/problems/Giancoli_6/problem19.31.tex    | 32 +++++++-------
 .../Serway_and_Jewett_4/problem12.18.tex      |  2 +-
 .../Serway_and_Jewett_4/problem13.16.tex      |  6 +--
 .../Serway_and_Jewett_4/problem14.08.tex      |  4 +-
 .../Serway_and_Jewett_4/problem14.20.tex      |  2 +-
 .../Serway_and_Jewett_4/problem19.07.tex      |  4 +-
 .../Serway_and_Jewett_4/problem28.57.tex      |  6 +--
 .../problem12.V1.tex                          | 20 ++++-----
 .../problem12.06.T.tex                        | 11 ++---
 .../problem12.47.T.tex                        | 10 ++---
 .../problem28.62.T.tex                        |  4 +-
 .../question09.11.T.tex                       |  7 ++--
 .../Serway_and_Jewett_8/problem02.11.tex      |  8 ++--
 .../Serway_and_Jewett_8/problem03.24.tex      | 18 ++++----
 .../Serway_and_Jewett_8/problem03.28.tex      |  8 ++--
 .../Serway_and_Jewett_8/problem03.29.tex      |  6 ++-
 .../Serway_and_Jewett_8/problem03.36.tex      | 11 +++--
 .../Serway_and_Jewett_8/problem03.43.tex      |  6 ++-
 .../Serway_and_Jewett_8/problem05.25.tex      |  2 +-
 .../Serway_and_Jewett_8/problem05.30.tex      |  4 +-
 .../Serway_and_Jewett_8/problem06.11.tex      |  2 +-
 .../Serway_and_Jewett_8/problem06.21.tex      |  4 +-
 .../Serway_and_Jewett_8/problem23.09.tex      | 10 ++---
 .../Serway_and_Jewett_8/problem23.17.tex      | 10 ++---
 .../Serway_and_Jewett_8/problem23.50.tex      |  8 ++--
 .../Serway_and_Jewett_8/problem23.59.tex      |  6 +--
 .../Serway_and_Jewett_8/problem29.02.tex      |  8 ++--
 .../Serway_and_Jewett_8/problem29.03.tex      | 12 +++---
 .../Serway_and_Jewett_8/problem29.22.tex      |  2 +-
 .../Young_and_Freedman_12/problem21.84.tex    | 42 ++++++++++---------
 .../Young_and_Freedman_12/problem21.86.tex    |  8 ++--
 .../Young_and_Freedman_12/problem23.21.tex    | 12 +++---
 .../Young_and_Freedman_12/problem23.60.tex    |  6 +--
 .../Young_and_Freedman_12/problem23.63.tex    |  2 +-
 .../Young_and_Freedman_12/problem27.35.tex    |  6 +--
 .../Young_and_Freedman_12/problem27.68.tex    |  2 +-
 .../Young_and_Freedman_12/problem27.73.tex    |  4 +-
 .../Young_and_Freedman_12/problem28.12.tex    | 12 +++---
 .../Young_and_Freedman_12/problem28.62.tex    | 15 +++----
 .../Young_and_Freedman_12/problem29.10.tex    |  8 ++--
 .../Young_and_Freedman_12/problem29.21.tex    |  2 +-
 .../Young_and_Freedman_12/problem29.25.tex    |  4 +-
 .../wking/problem.sprung-pendulum.tex         | 31 +++++++-------
 44 files changed, 207 insertions(+), 195 deletions(-)

diff --git a/latex/problems/Giancoli_6/problem19.24.tex b/latex/problems/Giancoli_6/problem19.24.tex
index 15bc710..1dc6d58 100644
--- a/latex/problems/Giancoli_6/problem19.24.tex
+++ b/latex/problems/Giancoli_6/problem19.24.tex
@@ -4,12 +4,15 @@ Determine the terminal voltage of each battery in Fig.~19-44.
 \begin{asy}
   import Circ;
   real u = 3cm;
-  TwoTerminal ra = resistor((0,0), normal, 0, "$r_1 = 1.0\U{\Ohm}$", "");
-  TwoTerminal Ba = source(ra.end, DC, 0, "", "$\mathcal{E}_1 = 12\U{V}$");
-  TwoTerminal rb = resistor(ra.beg+(0,-u), normal, 0, "$r_2 = 2.0\U{\Ohm}$", "");
-  TwoTerminal Bb = source(rb.end, DC, 0, "", "$\mathcal{E}_2 = 18\U{V}$");
-  TwoTerminal R = resistor(Bb.end+(0.5u,0.25u), normal, 90, "", "$R = 6.6\U{\Ohm}$");
-  wireU(rb.beg, ra.beg, -24pt, rlsq);
+  TwoTerminal ra = resistor((0,0), ang=0, "$r_1 = 1.0\U{\Ohm}$", "");
+  TwoTerminal Ba = source(
+    ra.end, ang=0, type=DC, "", "$\mathcal{E}_1 = 12\U{V}$");
+  TwoTerminal rb = resistor(ra.beg+(0,-u), ang=0, "$r_2 = 2.0\U{\Ohm}$", "");
+  TwoTerminal Bb = source(
+    rb.end, ang=0, type=DC, "", "$\mathcal{E}_2 = 18\U{V}$");
+  TwoTerminal R = resistor(
+    Bb.end+(0.5u,0.25u), ang=90, "", "$R = 6.6\U{\Ohm}$");
+  wire(rb.beg, ra.beg, rlsq, dist=-24pt);
   wire(Bb.end, R.beg, rlsq);
   wire(Ba.end, R.end, rlsq);
 \end{asy}
diff --git a/latex/problems/Giancoli_6/problem19.31.tex b/latex/problems/Giancoli_6/problem19.31.tex
index 28a539f..d9636f2 100644
--- a/latex/problems/Giancoli_6/problem19.31.tex
+++ b/latex/problems/Giancoli_6/problem19.31.tex
@@ -7,14 +7,14 @@ Calculate the currents in each resistor of Fig.~19-49.
 \begin{asy}
 import Circ;
 real u = 3cm;
-TwoTerminal Bc = source((0,0), DC, 90, "", "$3.0\U{V}$");
-TwoTerminal Rcb = resistor(Bc.beg, normal, -90, "$10\U{\Ohm}$", "");
-TwoTerminal Rca = resistor(Bc.end, normal, 180, "", "$2\U{\Ohm}$");
+TwoTerminal Bc = source((0,0), ang=90, type=DC, "", "$3.0\U{V}$");
+TwoTerminal Rcb = resistor(Bc.beg, ang=-90, "$10\U{\Ohm}$", "");
+TwoTerminal Rca = resistor(Bc.end, ang=180, "", "$2\U{\Ohm}$");
 pair Jtop = Rca.end, Jbot = (Jtop.x,Rcb.end.y);
-TwoTerminal Rb = resistor(Jtop, normal, -90, "$6\U{\Ohm}$", "");
-TwoTerminal Ba = source(Jtop, DC, 180, "", "$6.0\U{V}$");
-TwoTerminal Rab = resistor(Jbot, normal, 180, "$8\U{\Ohm}$", "");
-TwoTerminal Raa = resistor(Rab.end, normal, 90, "$12\U{\Ohm}$", "");
+TwoTerminal Rb = resistor(Jtop, ang=-90, "$6\U{\Ohm}$", "");
+TwoTerminal Ba = source(Jtop, ang=180, type=DC, "", "$6.0\U{V}$");
+TwoTerminal Rab = resistor(Jbot, ang=180, "$8\U{\Ohm}$", "");
+TwoTerminal Raa = resistor(Rab.end, ang=90, "$12\U{\Ohm}$", "");
 wire(Ba.end, Raa.end, rlsq);
 wire(Rab.beg, Jbot, nsq);
 wire(Jbot, Rb.end, nsq);
@@ -28,16 +28,16 @@ wire(Jbot, Rcb.end, rlsq);
 \begin{asy}
 import Circ;
 TwoTerminal Bc = source((0,0), DC, 90, "", "$3.0\U{V}$");
-TwoTerminal Rcb = resistor(Bc.beg, normal, -90, "$10\U{\Ohm}$", "");
-TwoTerminal Rca = resistor(Bc.end, normal, 180, "", "$2\U{\Ohm}$");
+TwoTerminal Rcb = resistor(Bc.beg, ang=-90, "$10\U{\Ohm}$", "");
+TwoTerminal Rca = resistor(Bc.end, ang=180, "", "$2\U{\Ohm}$");
 pair Jtop = Rca.end, Jbot = (Jtop.x,Rcb.end.y);
-TwoTerminal Ic = current((Jbot+Rcb.end)/2, 0, "", "$I_3$");
-TwoTerminal Rb = resistor(Jtop, normal, -90, "$6\U{\Ohm}$", "");
-TwoTerminal Ib = current(Rb.end, -90, "", "$I_2$");
-TwoTerminal Ba = source(Jtop, DC, 180, "", "$6.0\U{V}$");
-TwoTerminal Ia = current(Ba.end, 180, "$I_1$", "");
-TwoTerminal Rab = resistor(Jbot, normal, 180, "$8\U{\Ohm}$", "");
-TwoTerminal Raa = resistor(Rab.end, normal, 90, "$12\U{\Ohm}$", "");
+TwoTerminal Ic = current((Jbot+Rcb.end)/2, "", "$I_3$");
+TwoTerminal Rb = resistor(Jtop, ang=-90, "$6\U{\Ohm}$", "");
+TwoTerminal Ib = current(Rb.end, ang=-90, "", "$I_2$");
+TwoTerminal Ba = source(Jtop, ang=180, type=DC, "", "$6.0\U{V}$");
+TwoTerminal Ia = current(Ba.end, ang=180, "$I_1$", "");
+TwoTerminal Rab = resistor(Jbot, ang=180, "$8\U{\Ohm}$", "");
+TwoTerminal Raa = resistor(Rab.end, ang=90, "$12\U{\Ohm}$", "");
 wire(Ia.end, Raa.end, rlsq);
 wire(Jbot, Ib.end, nsq);
 wire(Jbot, Ic.beg, nsq);
diff --git a/latex/problems/Serway_and_Jewett_4/problem12.18.tex b/latex/problems/Serway_and_Jewett_4/problem12.18.tex
index 1e6b4ce..fb64459 100644
--- a/latex/problems/Serway_and_Jewett_4/problem12.18.tex
+++ b/latex/problems/Serway_and_Jewett_4/problem12.18.tex
@@ -23,7 +23,7 @@ real u = 1cm;
 real a = u/2;
 
 Surface surf = Surface(pFrom=(-.7u,-a/2), pTo=(2u,-a/2));
-Block b = Block(center=(0,0), side=a);
+Block b = Block(center=(0,0), width=a);
 Spring spring = Spring(pFrom=(b.center+(a/2,0)), pTo=(2u,0));
 Vector Fspring = Force(b.center, mag=2a, dir=0, L="$F_s$");
 Vector Fexternal = Force(b.center, mag=2a, dir=180, L="$F_e$");
diff --git a/latex/problems/Serway_and_Jewett_4/problem13.16.tex b/latex/problems/Serway_and_Jewett_4/problem13.16.tex
index 0df674e..02ba8fe 100644
--- a/latex/problems/Serway_and_Jewett_4/problem13.16.tex
+++ b/latex/problems/Serway_and_Jewett_4/problem13.16.tex
@@ -18,11 +18,11 @@ real dx = 12pt; // length of bonus string for hanging mass & wall above string
 real r = 12pt;  // radius of hanging mass
 
 Mass m = Mass(radius=r, L="m");
-pair junction = m.center + (0, r+dx);
+pair junction = m.center() + (0, r+dx);
 real theta = asin(D/L) * 180 / pi;
 pair wall_join_r = junction + L/2*dir(90-theta);
 pair surf_ur = wall_join_r + (0, dx);
-pair surf_lr = (surf_ur.x, m.center.y - r - dx);
+pair surf_lr = (surf_ur.x, m.center().y - r - dx);
 Surface s_r = Surface(pFrom=surf_lr, pTo=surf_ur);
 pair wall_join_l = xscale(-1)*wall_join_r;
 pair surf_ul = xscale(-1)*surf_ur;
@@ -30,7 +30,7 @@ pair surf_ll = xscale(-1)*surf_lr;
 Surface s_l = Surface(pFrom=surf_ul, pTo=surf_ll);
 Distance d = Distance(pFrom=wall_join_l, pTo=wall_join_r, L="$3L/4$");
 
-draw(m.center -- junction);
+draw(m.center() -- junction);
 draw(wall_join_l -- junction -- wall_join_r);
 s_r.draw();
 s_l.draw();
diff --git a/latex/problems/Serway_and_Jewett_4/problem14.08.tex b/latex/problems/Serway_and_Jewett_4/problem14.08.tex
index 9529e5d..3708d0c 100644
--- a/latex/problems/Serway_and_Jewett_4/problem14.08.tex
+++ b/latex/problems/Serway_and_Jewett_4/problem14.08.tex
@@ -32,8 +32,8 @@ label("$S_b$", SpeakerB, W);
 dot(Listener);
 label("Listener", Listener, E);
 dAB.draw();
-dAL.draw(rotateLabel=false);
-dBL.draw(rotateLabel=false);
+dAL.draw();
+dBL.draw();
 \end{asy}
 \end{center}
 \Part{a}
diff --git a/latex/problems/Serway_and_Jewett_4/problem14.20.tex b/latex/problems/Serway_and_Jewett_4/problem14.20.tex
index a7281ff..b1a4e09 100644
--- a/latex/problems/Serway_and_Jewett_4/problem14.20.tex
+++ b/latex/problems/Serway_and_Jewett_4/problem14.20.tex
@@ -31,7 +31,7 @@ for (i=0; i<=n; ++i) {
 
 Block vib = Block((-w/2,0), width=w, height=w/3, L="vibrator");
 Block obj = Block((L+(1+cos(pi/4))*A, -L/3), width=vib.height, L="$m$");
-Distance dL = Distance((0,vib.height/2), (L,vib.height/2), L="$L$");
+Distance dL = Distance((0,vib.height/2), (L,vib.height/2), L=Label("$L$", N));
 
 draw(p, blue);
 draw(yscale(-1)*p, blue+dotted);
diff --git a/latex/problems/Serway_and_Jewett_4/problem19.07.tex b/latex/problems/Serway_and_Jewett_4/problem19.07.tex
index f30773f..c36bacb 100644
--- a/latex/problems/Serway_and_Jewett_4/problem19.07.tex
+++ b/latex/problems/Serway_and_Jewett_4/problem19.07.tex
@@ -21,7 +21,7 @@ real qb = -18e-9;
 
 Charge a = aCharge((0,0)*u, q=qa, L="$q_1$");
 Charge b = aCharge((0.03,0)*u, q=qb, L="$q_2$");
-Distance r = Distance(a.center, b.center, L="$r$");
+Distance r = Distance(a.center(), b.center(), L="$r$");
 Vector Fab = CoulombForce(a, b, scale=Fscale, L="$F$");
 Vector Fba = CoulombForce(b, a, scale=Fscale, L="$F$");
 Fab.mag /= 10.0; // Not part of Fscale b/c of rounding
@@ -55,7 +55,7 @@ real qb = -18e-9;
 
 Charge a = aCharge((0,0)*u, q=(qa+qb)/2, L="$Q/2$");
 Charge b = aCharge((0.03,0)*u, q=(qa+qb)/2, L="$Q/2$");
-Distance r = Distance(a.center, b.center, L="$r$");
+Distance r = Distance(a.center(), b.center(), L="$r$");
 Vector Fab = CoulombForce(a, b, scale=Fscale, L="$F$");
 Vector Fba = CoulombForce(b, a, scale=Fscale, L="$F$");
 
diff --git a/latex/problems/Serway_and_Jewett_4/problem28.57.tex b/latex/problems/Serway_and_Jewett_4/problem28.57.tex
index 4804571..7d56197 100644
--- a/latex/problems/Serway_and_Jewett_4/problem28.57.tex
+++ b/latex/problems/Serway_and_Jewett_4/problem28.57.tex
@@ -48,10 +48,8 @@ for (i=0; i<x.length; ++i) {
 }
 
 linefit L=leastsquares(x, y);
-write("work function");
-write(L.b);
-write("h/e");
-write(L.m);
+write("work function ", L.b);
+write("h/e ", L.m);
 
 real fit(real f)
 {
diff --git a/latex/problems/Serway_and_Jewett_4_venkat/problem12.V1.tex b/latex/problems/Serway_and_Jewett_4_venkat/problem12.V1.tex
index 057ba87..fe6508f 100644
--- a/latex/problems/Serway_and_Jewett_4_venkat/problem12.V1.tex
+++ b/latex/problems/Serway_and_Jewett_4_venkat/problem12.V1.tex
@@ -55,34 +55,34 @@ s.draw();
 
 real x = 2L;
 m = Mass((x,h), radius=1.5mm);
-s = Spring(pFrom=(x,h+dL+L), pTo=m.center);
+s = Spring(pFrom=(x,h+dL+L), pTo=m.center());
 s.draw();
 m.draw();
 
 real x = 3L;
-m.center = (x,h+A);
-s = Spring(pFrom=(x,h+dL+L), pTo=m.center);
+m.set_center((x,h+A));
+s = Spring(pFrom=(x,h+dL+L), pTo=m.center());
 s.draw();
 m.draw();
 
 real x = 4L;
-m.center = (x,h-A);
-s = Spring(pFrom=(x,h+dL+L), pTo=m.center);
+m.set_center((x,h-A));
+s = Spring(pFrom=(x,h+dL+L), pTo=m.center());
 s.draw();
 m.draw();
 
 real dx = 0.5u;
 Distance Dh = Distance(pFrom=(0,0), pTo=(0,h), "$h$");
-Dh.draw(rotateLabel=false);
+Dh.draw();
 Distance DdL = Distance(pFrom=(dx,h), pTo=(dx,h+dL), "$\Delta l$ ");
 // inline asymptote crowds the label.  this space intentional  -^
-DdL.draw(rotateLabel=false);
+DdL.draw();
 Distance DL = Distance(pFrom=(2dx,h+dL), pTo=(2dx,h+dL+L), "$L$");
-DL.draw(rotateLabel=false);
+DL.draw();
 Distance Aup = Distance(pFrom=(3dx,h), pTo=(3dx,h+A), "$A$");
-Aup.draw(rotateLabel=false);
+Aup.draw();
 Distance Adn = Distance(pFrom=(4dx,h-A), pTo=(4dx,h), "$A$");
-Adn.draw(rotateLabel=false);
+Adn.draw();
 \end{asy}
 \end{center}
 
diff --git a/latex/problems/Serway_and_Jewett_4_wking/problem12.06.T.tex b/latex/problems/Serway_and_Jewett_4_wking/problem12.06.T.tex
index e57f6ec..0a7e525 100644
--- a/latex/problems/Serway_and_Jewett_4_wking/problem12.06.T.tex
+++ b/latex/problems/Serway_and_Jewett_4_wking/problem12.06.T.tex
@@ -18,13 +18,14 @@ real u = 1cm;
 real a=6.4; // degrees
 real force=2u; // magnitude
 Pendulum p = makePendulum(angleDeg=a, length=2u, stringL="$L$");
-p.mass.radius = 0;
-Vector fg = Force(p.mass.center/2, dir=-90, mag=force, L="$F_g$");
-Vector fgtan = Force(p.mass.center/2, dir=a-180, mag=force*sin(a), L=Label("$F_{\tan}$"));
-Vector v = Velocity(p.mass.center, dir=a, mag=0.5u, L="$v$");
+p.mass.lc.radius = 0;
+Vector fg = Force(p.mass.center()/2, dir=-90, mag=force, L="$F_g$");
+Vector fgtan = Force(p.mass.center()/2, dir=a-180, mag=force*sin(a),
+    L=Label("$F_{\tan}$"));
+Vector v = Velocity(p.mass.center(), dir=a, mag=0.5u, L="$v$");
 
 fg.draw();
-fgtan.draw(labelOffset=(-2mm,1mm));
+fgtan.draw();
 v.draw();
 p.draw(drawVertical=true);
 \end{asy}
diff --git a/latex/problems/Serway_and_Jewett_4_wking/problem12.47.T.tex b/latex/problems/Serway_and_Jewett_4_wking/problem12.47.T.tex
index 3b4d809..cd09341 100644
--- a/latex/problems/Serway_and_Jewett_4_wking/problem12.47.T.tex
+++ b/latex/problems/Serway_and_Jewett_4_wking/problem12.47.T.tex
@@ -16,7 +16,7 @@ import Mechanics;
 real u = 1cm;
 
 Pendulum p = makePendulum(angleDeg=25, length=2u, angleL="$\theta$");
-Spring s = Spring(pFrom=p.mass.center, pTo=p.mass.center+2u,
+Spring s = Spring(pFrom=p.mass.center(), pTo=p.mass.center()+2u,
                   unstretchedLength=2u);
 
 s.draw();
@@ -33,17 +33,17 @@ real u = 1cm;
 
 Pendulum p = makePendulum(angleDeg=25, length=2u,
                           angleL="$\theta$", stringL="$r$");
-Spring s = Spring(pFrom=p.mass.center, pTo=p.mass.center+2u,
+Spring s = Spring(pFrom=p.mass.center(), pTo=p.mass.center()+2u,
                   unstretchedLength=2u, L="$k$");
-Vector fs = Force(p.mass.center, dir=180, mag=5mm, L="$F_s$");
-Vector fg = Force(p.mass.center, dir=-90, mag=7mm, L="$F_g$");
+Vector fs = Force(p.mass.center(), dir=180, mag=5mm, L="$F_s$");
+Vector fg = Force(p.mass.center(), dir=-90, mag=7mm, L="$F_g$");
 
 s.draw();
 fs.draw();
 fg.draw();
 p.draw(drawVertical=true);
 
-label("$m$", p.mass.center);
+label("$m$", p.mass.center());
 \end{asy}
 \end{center}
 The spring is stretched or compressed by $x \approx r\sin(\theta)$
diff --git a/latex/problems/Serway_and_Jewett_4_wking/problem28.62.T.tex b/latex/problems/Serway_and_Jewett_4_wking/problem28.62.T.tex
index 92ac9de..d0aa302 100644
--- a/latex/problems/Serway_and_Jewett_4_wking/problem28.62.T.tex
+++ b/latex/problems/Serway_and_Jewett_4_wking/problem28.62.T.tex
@@ -40,9 +40,9 @@ label("incoming particle", v.center, W);
 v.draw();
 dot(v.center);
 Distance dE = Distance(pFrom=(xpos, 0), pTo=(xpos, E), L="E");
-dE.draw(rotateLabel=false);
+dE.draw();
 Distance dU = Distance(pFrom=(-xpos, 0), pTo=(-xpos, U), L="U");
-dU.draw(rotateLabel=false);
+dU.draw();
 \end{asy}
 \end{center}
 \end{problem} % problem 28.62
diff --git a/latex/problems/Serway_and_Jewett_4_wking/question09.11.T.tex b/latex/problems/Serway_and_Jewett_4_wking/question09.11.T.tex
index 396febd..6e91c69 100644
--- a/latex/problems/Serway_and_Jewett_4_wking/question09.11.T.tex
+++ b/latex/problems/Serway_and_Jewett_4_wking/question09.11.T.tex
@@ -6,9 +6,10 @@ increase when it is compressed by $1\U{cm}$?
 import Mechanics;
 real u = .5cm;
 
-Spring Su = Spring(pFrom=(0,0), pTo=(4u,0), k=500, L="$m$");
-Spring Sc = Spring(pFrom=(0,-2u), pTo=(3u,-2u), k=500, L="$m'$");
-Distance d = Distance(pFrom=(4u,-2u), pTo=(3u,-2u), scale=u, L=rotate(90)*Label("1 cm"));
+Spring Su = Spring(pFrom=(0,0), pTo=(4u,0), k=500, L=Label("$m$", N));
+Spring Sc = Spring(pFrom=(0,-2u), pTo=(3u,-2u), k=500, L=Label("$m'$", N));
+Distance d = Distance(pFrom=(4u,-2u), pTo=(3u,-2u), scale=u,
+    L=rotate(90)*Label("$1\U{cm}$", S));
 Su.draw();
 Sc.draw();
 d.draw();
diff --git a/latex/problems/Serway_and_Jewett_8/problem02.11.tex b/latex/problems/Serway_and_Jewett_8/problem02.11.tex
index 082fbfe..fe2c3fb 100644
--- a/latex/problems/Serway_and_Jewett_8/problem02.11.tex
+++ b/latex/problems/Serway_and_Jewett_8/problem02.11.tex
@@ -37,14 +37,14 @@ dot((0,0));  // start
 dot(f);      // finish
 
 Vector T1 = Vector((0,0), mag=length(f), dir=degrees(f), "tortoise");
-T1.draw(rotateLabel=true, labelOffset=-f/2);
+T1.draw();
 
 Vector H1 = Vector((0,0), mag=length(h1), dir=degrees(h1), "hare");
-H1.draw(rotateLabel=true, labelOffset=-h1/2);
+H1.draw();
 Vector H2 = Vector(h1, mag=length(h2-h1), dir=degrees(h2-h1), "pause");
-H2.draw(rotateLabel=true, labelOffset=-(h2-h1)*2/3);
+H2.draw();
 Vector H3 = Vector(h2, mag=length(f-h2), dir=degrees(f-h2), "hare");
-H3.draw(rotateLabel=true, labelOffset=-(f-h2)/2);
+H3.draw();
 
 xaxis("$x$");
 yaxis("$t$");
diff --git a/latex/problems/Serway_and_Jewett_8/problem03.24.tex b/latex/problems/Serway_and_Jewett_8/problem03.24.tex
index ff6f894..46df154 100644
--- a/latex/problems/Serway_and_Jewett_8/problem03.24.tex
+++ b/latex/problems/Serway_and_Jewett_8/problem03.24.tex
@@ -19,11 +19,11 @@ real u = 0.25cm;
 pair a = (2u, 6u);
 pair b = (3u, -2u);
 Vector A = Vector((0,0), mag=length(a), dir=degrees(a), "$\vect{A}$");
-A.draw(rotateLabel=true);
+A.draw();
 Vector B = Vector(a, mag=length(b), dir=degrees(b), "$\vect{B}$");
-B.draw(rotateLabel=true);
+B.draw();
 Vector C = Vector((0,0), mag=length(a+b), dir=degrees(a+b), "$\vect{C}$");
-C.draw(rotateLabel=true, labelOffset=-(a+b)/3);
+C.draw();
 \end{asy}
 \hspace{1cm}
 \begin{asy}
@@ -34,11 +34,11 @@ real u = 0.25cm;
 pair a = (2u, 6u);
 pair b = (3u, -2u);
 Vector A = Vector((0,0), mag=length(a), dir=degrees(a), "$\vect{A}$");
-A.draw(rotateLabel=true, labelOffset=-a/3);
+A.draw();
 Vector B = Vector(a-b, mag=length(b), dir=degrees(b), "$\vect{B}$");
-B.draw(rotateLabel=true);
+B.draw();
 Vector D = Vector((0,0), mag=length(a-b), dir=degrees(a-b), "$\vect{D}$");
-D.draw(rotateLabel=true);
+D.draw();
 \end{asy}
 \end{center}
 
@@ -87,15 +87,15 @@ pair d = (1u, -8u);
 pair D = -d;
 
 Angle a = Angle((1,0), (0,0), d, red, "$-82.9\dg$");
-a.draw(labelOffsetAdjustment=2mm);
+a.draw();
 Vector vd = Vector((0,0), mag=length(d), dir=degrees(d), "$(1,-8)$");
 vd.draw();
 Angle A = Angle((1,0), (0,0), D, blue, "$97.1\dg$");
-A.draw(labelOffsetAdjustment=2mm);
+A.draw();
 Vector vD = Vector((0,0), mag=length(D), dir=degrees(D), "$(-1,8)$");
 vD.draw();
 Angle r = Angle(d, (0, 0), D, radius=15mm, green, "$180.0\dg$");
-r.draw(labelOffsetAdjustment=4mm);
+r.draw();
 
 xaxis("$x$");
 \end{asy}
diff --git a/latex/problems/Serway_and_Jewett_8/problem03.28.tex b/latex/problems/Serway_and_Jewett_8/problem03.28.tex
index 5d331f0..d061906 100644
--- a/latex/problems/Serway_and_Jewett_8/problem03.28.tex
+++ b/latex/problems/Serway_and_Jewett_8/problem03.28.tex
@@ -23,16 +23,16 @@ dot((0,0));  // initial ball position
 draw((0,-5u)--(0, 20u), dashed);  // line of scrimmage
 
 Vector vDrop = Vector((0,0), mag=length(drop), dir=degrees(drop), "drop");
-vDrop.draw(labelOffset=-drop/2);
+vDrop.draw();
 Vector vScramble = Vector(
     drop, mag=length(scramble), dir=degrees(scramble), "scramble");
-vScramble.draw(rotateLabel=true, labelOffset=-scramble/2);
+vScramble.draw();
 Vector vPass = Vector(drop+scramble, mag=length(pass), dir=degrees(pass),
     "pass");
-vPass.draw(rotateLabel=true, labelOffset=-pass/2);
+vPass.draw();
 Vector vResult = Vector((0,0), mag=length(result), dir=degrees(result),
     "result");
-vResult.draw(rotateLabel=true, labelOffset=-result/2);
+vResult.draw();
 \end{asy}
 \end{center}
 
diff --git a/latex/problems/Serway_and_Jewett_8/problem03.29.tex b/latex/problems/Serway_and_Jewett_8/problem03.29.tex
index d61ed3b..97698df 100644
--- a/latex/problems/Serway_and_Jewett_8/problem03.29.tex
+++ b/latex/problems/Serway_and_Jewett_8/problem03.29.tex
@@ -17,11 +17,13 @@ real u = 0.02cm;
 
 Angle a = Angle((1,0), (0,0), dir(60), "$\theta_1$");
 a.draw();
-Vector A = Vector((0,0), mag=120u, dir=60, "$\vect{F}_1$");
+Vector A = Vector((0,0), mag=120u, dir=60,
+    L=Label("$\vect{F}_1$", position=EndPoint, align=RightSide));
 A.draw();
 Angle b = Angle((-1,0), (0,0), dir(180-75), "$\theta_2$");
 b.draw();
-Vector B = Vector((0,0), mag=80u, dir=180-75, "$\vect{F}_2$");
+Vector B = Vector((0,0), mag=80u, dir=180-75,
+    L=Label("$\vect{F}_2$", position=EndPoint, align=LeftSide));
 B.draw();
 
 xaxis("$x$");
diff --git a/latex/problems/Serway_and_Jewett_8/problem03.36.tex b/latex/problems/Serway_and_Jewett_8/problem03.36.tex
index e5ef67d..39afb7c 100644
--- a/latex/problems/Serway_and_Jewett_8/problem03.36.tex
+++ b/latex/problems/Serway_and_Jewett_8/problem03.36.tex
@@ -15,11 +15,14 @@ pair a = 20u * dir(90);
 pair b = 40u * dir(45);
 pair c = 30u * dir(-45);
 
-Vector A = Vector((0,0), mag=length(a), dir=degrees(a), "$\vect{A}$");
+Vector A = Vector((0,0), mag=length(a), dir=degrees(a),
+    L=Label("$\vect{A}$", position=EndPoint, align=E));
 A.draw();
-Vector B = Vector((0,0), mag=length(b), dir=degrees(b), "$\vect{B}$");
+Vector B = Vector((0,0), mag=length(b), dir=degrees(b),
+    L=Label("$\vect{B}$", position=EndPoint, align=RightSide));
 B.draw();
-Vector C = Vector((0,0), mag=length(c), dir=degrees(c), "$\vect{C}$");
+Vector C = Vector((0,0), mag=length(c), dir=degrees(c),
+    L=Label("$\vect{C}$", position=EndPoint, align=LeftSide));
 C.draw();
 
 xaxis("$x$");
@@ -49,7 +52,7 @@ B.draw();
 Vector C = Vector(a+b, mag=length(c), dir=degrees(c), "$\vect{C}$");
 C.draw();
 Vector R = Vector((0,0), mag=length(r), dir=degrees(r), "$\vect{r}$");
-R.draw(labelOffset=-r/2);
+R.draw();
 
 xaxis("$x$");
 yaxis("$y$");
diff --git a/latex/problems/Serway_and_Jewett_8/problem03.43.tex b/latex/problems/Serway_and_Jewett_8/problem03.43.tex
index e293531..c3442ce 100644
--- a/latex/problems/Serway_and_Jewett_8/problem03.43.tex
+++ b/latex/problems/Serway_and_Jewett_8/problem03.43.tex
@@ -21,9 +21,11 @@ draw((-dx,h)--(d+dx,h), dashed);
 Surface s = Surface((-dx,0), (d+dx,0));
 s.draw();
 
-Vector A = Vector((0,0), mag=h, dir=90, "$\vect{R}_0$");
+Vector A = Vector((0,0), mag=h, dir=90,
+    L=Label("$\vect{R}_0$", position=EndPoint, align=W));
 A.draw();
-Vector B = Vector((0,0), mag=length((d,h)), dir=degrees((d,h)), "$\vect{R}_{30}$");
+Vector B = Vector((0,0), mag=length((d,h)), dir=degrees((d,h)),
+    L=Label("$\vect{R}_{30}$", position=EndPoint, align=RightSide));
 B.draw();
 \end{asy}
 \end{center}
diff --git a/latex/problems/Serway_and_Jewett_8/problem05.25.tex b/latex/problems/Serway_and_Jewett_8/problem05.25.tex
index 391cbb7..d1fbf92 100644
--- a/latex/problems/Serway_and_Jewett_8/problem05.25.tex
+++ b/latex/problems/Serway_and_Jewett_8/problem05.25.tex
@@ -71,7 +71,7 @@ Vector F3 = Force((0,0), mag=T3, dir=-90, "$\vect{F}_3$");
 
 a1.draw();
 a2.draw();
-A1.draw(labelOffsetAdjustment=12pt);
+A1.draw();
 A3.draw();
 draw((-7mm,0)--(7mm,0));
 draw((12mm*dir(-90+theta2))--(0,0)--(12mm*dir(180+theta2)));
diff --git a/latex/problems/Serway_and_Jewett_8/problem05.30.tex b/latex/problems/Serway_and_Jewett_8/problem05.30.tex
index b6516d1..4f8afa0 100644
--- a/latex/problems/Serway_and_Jewett_8/problem05.30.tex
+++ b/latex/problems/Serway_and_Jewett_8/problem05.30.tex
@@ -35,7 +35,7 @@ pair m2perp = rotate(-90)*dir(top-botR);
 Block m2 = Block(
     m2bot + a/2*m2perp, width=a, height=a, direction=-theta, "$m_2$");
 
-pair ropecross = extension(m1.center, m1.center+N,
+pair ropecross = extension(m1.center(), m1.center()+N,
                            m2.center, m2.center+(top-botR));
 pair pulley = ropecross + (pr, -pr/Tan(theta/2));
 
@@ -47,7 +47,7 @@ draw(pulley -- (pulley + 1.3(top-pulley)), psw+currentpen);
 filldraw(botL -- botR -- top -- cycle, fillpen=rgb(0.8,0.8,0.3));
 A.draw();
 
-draw(m1.center -- (m1.center.x, pulley.y));
+draw(m1.center() -- (m1.center().x, pulley.y));
 draw(m2.center -- (pulley + pr*m2perp));
 
 filldraw(shift(pulley)*scale(pr)*unitcircle, fillpen=white);
diff --git a/latex/problems/Serway_and_Jewett_8/problem06.11.tex b/latex/problems/Serway_and_Jewett_8/problem06.11.tex
index 3b9fa0d..5fa65c6 100644
--- a/latex/problems/Serway_and_Jewett_8/problem06.11.tex
+++ b/latex/problems/Serway_and_Jewett_8/problem06.11.tex
@@ -15,7 +15,7 @@ import Mechanics;
 real u = 1cm;
 
 Mass m = Mass((u,0), "$m$");
-Vector F = Force(m.center, mag=0.7u, dir=180, "$F_f$");
+Vector F = Force(m.center(), mag=0.7u, dir=180, "$F_f$");
 
 draw(scale(u)*unitcircle);
 Distance r = Distance((0,0), u*dir(45), "$r$");
diff --git a/latex/problems/Serway_and_Jewett_8/problem06.21.tex b/latex/problems/Serway_and_Jewett_8/problem06.21.tex
index c4d1022..a84a5e6 100644
--- a/latex/problems/Serway_and_Jewett_8/problem06.21.tex
+++ b/latex/problems/Serway_and_Jewett_8/problem06.21.tex
@@ -14,10 +14,10 @@ real L = 2u;
 real theta = aTan(a/g);
 
 Mass m = Mass(L*dir(-90-theta), "$m$");
-draw((0,0)--m.center);
+draw((0,0)--m.center());
 m.draw();
 draw((0,0)--(0, -0.5L), dashed);
-Angle T = Angle((0,-1), (0,0), m.center, "$\theta$");
+Angle T = Angle((0,-1), (0,0), m.center(), "$\theta$");
 T.draw();
 dot((0,0));
 // Vector A = Acceleration
diff --git a/latex/problems/Serway_and_Jewett_8/problem23.09.tex b/latex/problems/Serway_and_Jewett_8/problem23.09.tex
index 8113e34..48e7934 100644
--- a/latex/problems/Serway_and_Jewett_8/problem23.09.tex
+++ b/latex/problems/Serway_and_Jewett_8/problem23.09.tex
@@ -13,12 +13,12 @@ import ElectroMag;
 
 real u = 16cm;
 
-Charge a = pCharge((0,0), 5, L="$5.00\U{nC}$");
-Charge b = pCharge((0.3u,0), 6, L="$6.00\U{nC}$");
-Charge c = nCharge((0,-0.1u), -3, L="$-3.00\U{nC}$");
-Distance dab = Distance(a.center, b.center, scale=u, L="$0.300\U{m}$");
+Charge a = pCharge((0,0), 5, L=Label("$5.00\U{nC}$", align=N));
+Charge b = pCharge((0.3u,0), 6, L=Label("$6.00\U{nC}$", align=N));
+Charge c = nCharge((0,-0.1u), -3, L=Label("$-3.00\U{nC}$", align=S));
+Distance dab = Distance(a.center(), b.center(), scale=u, L="$0.300\U{m}$");
 Distance dac = Distance(
-    a.center, c.center, offset=-0.1u, scale=u, L="$0.100\U{m}$");
+    a.center(), c.center(), offset=-0.1u, scale=u, L="$0.100\U{m}$");
 a.draw(); b.draw(); c.draw(); dab.draw(); dac.draw();
 draw_ijhat((-0.1u,-0.08u));
 \end{asy}
diff --git a/latex/problems/Serway_and_Jewett_8/problem23.17.tex b/latex/problems/Serway_and_Jewett_8/problem23.17.tex
index 375804f..55b05bb 100644
--- a/latex/problems/Serway_and_Jewett_8/problem23.17.tex
+++ b/latex/problems/Serway_and_Jewett_8/problem23.17.tex
@@ -10,13 +10,13 @@ import ElectroMag;
 
 real u = 1.5cm;
 
-Charge a = pCharge((0,0), 2, L="$2Q$");
-Charge b = nCharge((u,0), -1, L="$-Q$");
-Charge c = pCharge((0,u), 1, L="$Q$");
+Charge a = pCharge((0,0), 2, L=Label("$2Q$", align=S));
+Charge b = nCharge((u,0), -1, L=Label("$-Q$", align=S));
+Charge c = pCharge((0,u), 1, L=Label("$Q$", align=S));
 Distance dab = Distance(
-    a.center, b.center, offset=0.5u, scale=u, L="$d$");
+    a.center(), b.center(), offset=0.5u, scale=u, L="$d$");
 Distance dac = Distance(
-    a.center, c.center, offset=-0.5u, scale=u, L="$d$");
+    a.center(), c.center(), offset=-0.5u, scale=u, L="$d$");
 draw_ijhat((0,0));
 a.draw(); b.draw(); c.draw(); dab.draw(); dac.draw();
 \end{asy}
diff --git a/latex/problems/Serway_and_Jewett_8/problem23.50.tex b/latex/problems/Serway_and_Jewett_8/problem23.50.tex
index a5e09c1..37c01a5 100644
--- a/latex/problems/Serway_and_Jewett_8/problem23.50.tex
+++ b/latex/problems/Serway_and_Jewett_8/problem23.50.tex
@@ -20,14 +20,14 @@ real dab = 5u;
 
 Surface c1 = Surface(pFrom=(ceil_width,0), pTo=(-ceil_width,0));
 Charge a1 = pCharge((0, -initial_stretch), L="$q_1$");
-Spring s1 = Spring(pFrom=(0,0), pTo=a1.center);
+Spring s1 = Spring(pFrom=(0,0), pTo=a1.center());
 c1.draw(); s1.draw(); a1.draw();
 
 Surface c2 = Surface(pFrom=(frame_space+ceil_width,0),
                     pTo=(frame_space-ceil_width,0));
-Charge a2 = pCharge((frame_space, -initial_stretch-dx));
-Charge b = nCharge(a2.center - (0, dab), L="$q_2$");
-Spring s2 = Spring(pFrom=(frame_space,0), pTo=a2.center);
+Charge a2 = pCharge((frame_space, -initial_stretch-dx), L="$q_1$");
+Charge b = nCharge(a2.center() - (0, dab), L="$q_2$");
+Spring s2 = Spring(pFrom=(frame_space,0), pTo=a2.center());
 c2.draw(); s2.draw(); a2.draw(); b.draw();
 \end{asy}
 \end{center}
diff --git a/latex/problems/Serway_and_Jewett_8/problem23.59.tex b/latex/problems/Serway_and_Jewett_8/problem23.59.tex
index 7ee8611..e5d9df9 100644
--- a/latex/problems/Serway_and_Jewett_8/problem23.59.tex
+++ b/latex/problems/Serway_and_Jewett_8/problem23.59.tex
@@ -35,11 +35,11 @@ t.draw();
 
 Charge a = pCharge((x,y));
 
-Vector T = Vector(a.center, mag=T_mag, dir=90+theta, "$T$");
+Vector T = Vector(a.center(), mag=T_mag, dir=90+theta, "$T$");
 T.draw();
-Vector G = Vector(a.center, mag=G_mag, dir=-90, "$mg$");
+Vector G = Vector(a.center(), mag=G_mag, dir=-90, "$mg$");
 G.draw();
-Vector E = Vector(a.center, mag=E_mag, dir=E_dir, "$F_E$");
+Vector E = Vector(a.center(), mag=E_mag, dir=E_dir, "$F_E$");
 E.draw();
 
 a.draw();
diff --git a/latex/problems/Serway_and_Jewett_8/problem29.02.tex b/latex/problems/Serway_and_Jewett_8/problem29.02.tex
index 7b00983..6c133b6 100644
--- a/latex/problems/Serway_and_Jewett_8/problem29.02.tex
+++ b/latex/problems/Serway_and_Jewett_8/problem29.02.tex
@@ -28,7 +28,7 @@ for (int i=0; i<Bs.length; i+=1) {
 }
 
 Charge a = pCharge((-0.5*width-12pt, 0), "$+$");
-Vector v = Velocity(a.center, dir=0);
+Vector v = Velocity(a.center(), dir=0);
 v.draw();
 a.draw();
 
@@ -56,7 +56,7 @@ for (int i=0; i<Bs.length; i+=1) {
 }
 
 Charge a = nCharge((0.5*width+12pt, 0), "$-$");
-Vector v = Velocity(a.center, dir=180);
+Vector v = Velocity(a.center(), dir=180);
 v.draw();
 a.draw();
 
@@ -85,7 +85,7 @@ for (int i=0; i<Bs.length; i+=1) {
 }
 
 Charge a = pCharge((0.5*width+12pt, 0), "$+$");
-Vector v = Velocity(a.center, dir=180);
+Vector v = Velocity(a.center(), dir=180);
 v.draw();
 a.draw();
 
@@ -122,7 +122,7 @@ Angle t = Angle(dir(90)-(0,dy), (0,0)-(0,dy), dir(45)-(0,dy), "$\theta=45\dg$");
 t.draw();
 
 Charge a = pCharge((0, -0.5*height-12pt), "$+$");
-Vector v = Velocity(a.center, dir=90);
+Vector v = Velocity(a.center(), dir=90);
 v.draw();
 a.draw();
 
diff --git a/latex/problems/Serway_and_Jewett_8/problem29.03.tex b/latex/problems/Serway_and_Jewett_8/problem29.03.tex
index e6adef9..7559214 100644
--- a/latex/problems/Serway_and_Jewett_8/problem29.03.tex
+++ b/latex/problems/Serway_and_Jewett_8/problem29.03.tex
@@ -10,9 +10,9 @@ import Mechanics;
 
 real u=1cm;
 
-Vector f = Force(mag=u, dir=90, "$\vect{F}_B$");
+Vector f = Force(mag=u, dir=90, Label("$\vect{F}_B$", EndPoint, N));
 f.draw();
-Vector v = Velocity(mag=u, dir=0, "$\vect{v}$");
+Vector v = Velocity(mag=u, dir=0, Label("$\vect{v}$", EndPoint, S));
 v.draw();
 label("\Part{a}", (0,0), S);
 \end{asy}
@@ -22,9 +22,9 @@ import Mechanics;
 
 real u=1cm;
 
-Vector f = Force(mag=u, dir=90, "$\vect{F}_B$");
+Vector f = Force(mag=u, dir=90, Label("$\vect{F}_B$", EndPoint, N));
 f.draw();
-Vector v = Velocity(mag=u, phi=90, "$\vect{v}$");
+Vector v = Velocity(mag=u, phi=90, Label("$\vect{v}$", EndPoint, S));
 v.draw();
 label("\Part{b}", (0,0), S);
 \end{asy}
@@ -34,9 +34,9 @@ import Mechanics;
 
 real u=1cm;
 
-Vector f = Force(mag=u, dir=180, "$\vect{F}_B$");
+Vector f = Force(mag=u, dir=180, Label("$\vect{F}_B$", EndPoint, N));
 f.draw();
-Vector v = Velocity(mag=u, phi=-90, "$\vect{v}$");
+Vector v = Velocity(mag=u, phi=-90, Label("$\vect{v}$", EndPoint, S));
 v.draw();
 label("\Part{c}", (0,0), S);
 \end{asy}
diff --git a/latex/problems/Serway_and_Jewett_8/problem29.22.tex b/latex/problems/Serway_and_Jewett_8/problem29.22.tex
index fda7e40..92281a5 100644
--- a/latex/problems/Serway_and_Jewett_8/problem29.22.tex
+++ b/latex/problems/Serway_and_Jewett_8/problem29.22.tex
@@ -34,7 +34,7 @@ for (int i=0; i<Bs.length; i+=1) {
 }
 
 Charge a = nCharge((-0.5*width-24pt, 0), "$e^-$");
-Vector v = Velocity(a.center, dir=0, "$\vect{v}$");
+Vector v = Velocity(a.center(), dir=0, "$\vect{v}$");
 v.draw();
 a.draw();
 
diff --git a/latex/problems/Young_and_Freedman_12/problem21.84.tex b/latex/problems/Young_and_Freedman_12/problem21.84.tex
index b4bef88..40e4956 100644
--- a/latex/problems/Young_and_Freedman_12/problem21.84.tex
+++ b/latex/problems/Young_and_Freedman_12/problem21.84.tex
@@ -25,15 +25,16 @@ real dy = .6; // Distance below charges to E field vector
 
 Charge a = neutralCharge(dir(-90+phi)*L*u, L="$q_R$");
 Charge b = neutralCharge(dir(-90-phi)*L*u, L="$q_L$");
-Wire La = Wire((0,0), a.center, L="$L$");
-Wire Lb = Wire(b.center, (0,0), L="$L$");
-Angle theta = Angle(a.center, (0,0), b.center, L="$\theta$");
-Surface s = Surface((a.center.x, 0), (b.center.x, 0));
-Vector E = EField(a.center - (0,dy)*u, mag=(a.center.x - b.center.x), dir=-180, L="$E$");
+Wire La = Wire((0,0), a.center(), L=Label("$L$", align=NW, embed=Shift));
+Wire Lb = Wire(b.center(), (0,0), L=Label("$L$", align=NE, embed=Shift));
+Angle theta = Angle(a.center(), (0,0), b.center(), L="$\theta$");
+Surface s = Surface((a.center().x, 0), (b.center().x, 0));
+Vector E = EField(a.center() - (0,dy)*u, mag=(a.center().x - b.center().x),
+    dir=-180, L="$E$");
 
 s.draw();
-La.draw(rotateLabel=false);
-Lb.draw(rotateLabel=false);
+La.draw();
+Lb.draw();
 theta.draw();
 E.draw();
 a.draw();
@@ -56,15 +57,16 @@ real dy = .6; // Distance below charges to E field vector
 
 Charge a = nCharge(dir(-90+phi)*L*u, L="$q_{R-}$");
 Charge b = pCharge(dir(-90-phi)*L*u, L="$q_{L+}$");
-Wire La = Wire((0,0), a.center, L="$L$");
-Wire Lb = Wire(b.center, (0,0), L="$L$");
-Angle theta = Angle(a.center, (0,0), b.center, L="$\theta$");
-Surface s = Surface((a.center.x, 0), (b.center.x, 0));
-Vector E = EField(a.center - (0,dy)*u, mag=(a.center.x - b.center.x), dir=-180, L="$E$");
+Wire La = Wire((0,0), a.center(), L="$L$");
+Wire Lb = Wire(b.center(), (0,0), L="$L$");
+Angle theta = Angle(a.center(), (0,0), b.center(), L="$\theta$");
+Surface s = Surface((a.center().x, 0), (b.center().x, 0));
+Vector E = EField(a.center() - (0,dy)*u, mag=(a.center().x - b.center().x),
+    dir=-180, L="$E$");
 
 s.draw();
-La.draw(rotateLabel=false);
-Lb.draw(rotateLabel=false);
+La.draw();
+Lb.draw();
 theta.draw();
 E.draw();
 a.draw();
@@ -78,10 +80,10 @@ import ElectroMag;
 real phi = 30; // Half angle between cables
 
 Charge a = nCharge();
-Vector Fq = Force(a.center, mag=.4cm, dir=-180, L="$F_q$");
-Vector FT = Force(a.center, mag=1cm, dir=90+phi, L="$F_T$");
-Vector FE = Force(a.center, mag=Sin(phi)*FT.mag+Fq.mag, dir=0, L="$F_E$");
-Vector Fg = Force(a.center, mag=Cos(phi)*FT.mag, dir=-90, L="$F_g$");
+Vector Fq = Force(a.center(), mag=.4cm, dir=-180, L="$F_q$");
+Vector FT = Force(a.center(), mag=1cm, dir=90+phi, L="$F_T$");
+Vector FE = Force(a.center(), mag=Sin(phi)*FT.mag+Fq.mag, dir=0, L="$F_E$");
+Vector Fg = Force(a.center(), mag=Cos(phi)*FT.mag, dir=-90, L="$F_g$");
 Fq.draw();
 FT.draw();
 FE.draw();
@@ -89,7 +91,7 @@ Fg.draw();
 a.draw();
 
 Charge b = pCharge((-2cm, 0));
-Fq.center = FT.center = FE.center = Fg.center = b.center;
+Fq.center = FT.center = FE.center = Fg.center = b.center();
 Fq.dir += 180;
 FT.dir -= 2*phi;
 FE.dir += 180;
@@ -99,7 +101,7 @@ FE.draw();
 Fg.draw();
 b.draw();
 
-draw_ijhat((a.center+b.center)/2 - (0,1cm));
+draw_ijhat((a.center()+b.center())/2 - (0,1cm));
 \end{asy}
 \end{center}
 
diff --git a/latex/problems/Young_and_Freedman_12/problem21.86.tex b/latex/problems/Young_and_Freedman_12/problem21.86.tex
index 7933349..fe08ee0 100644
--- a/latex/problems/Young_and_Freedman_12/problem21.86.tex
+++ b/latex/problems/Young_and_Freedman_12/problem21.86.tex
@@ -23,7 +23,7 @@ real dy = 2;
 int n=3;
 
 Charge q = aCharge((0,0)*u, q=1, L="$q$");
-Vector v = Velocity(q.center, L="$v$");
+Vector v = Velocity(q.center(), L="$v$");
 Wire top_plate = Wire((0,0.5*dy)*u, (L,.5*dy)*u);
 Wire bottom_plate = Wire((0,-.5*dy)*u, (L,-.5*dy)*u);
 
@@ -33,14 +33,14 @@ for (int i=0; i<n; i+=1) {
   E.draw();
 }
 
-path p = q.center;
+path p = q.center();
 real x, y, frac;
 int m = 20;
 for (int i=0; i<=m; i+= 1) {
   frac = i/m;
   x = L*frac;
   y = 0.4*dy*frac**2;
-  p = p..(q.center + (x,y)*u);
+  p = p..(q.center() + (x,y)*u);
 }
 draw(p, grey);
 
@@ -49,7 +49,7 @@ bottom_plate.draw();
 v.draw();
 q.draw();
 
-draw_ijhat(q.center - (1,0)*u);
+draw_ijhat(q.center() - (1,0)*u);
 \end{asy}
 \end{center}
 From the forces on the drop in each direction
diff --git a/latex/problems/Young_and_Freedman_12/problem23.21.tex b/latex/problems/Young_and_Freedman_12/problem23.21.tex
index 63b5dd5..1f7a9ef 100644
--- a/latex/problems/Young_and_Freedman_12/problem23.21.tex
+++ b/latex/problems/Young_and_Freedman_12/problem23.21.tex
@@ -18,19 +18,19 @@ real dTB = 0.06;
 
 Charge qO = pCharge((0,0), L="$q_1$");
 Charge qT = nCharge((dOT,0)*u, L="$q_2$");
-pair A = (qO.center+qT.center)/2.0;
+pair A = (qO.center()+qT.center())/2.0;
 // x^2 + y^2 = dOB^2
-// (x-a)^2 + y^2 = dTB^2     where a=qT.center.x
+// (x-a)^2 + y^2 = dTB^2     where a=qT.center().x
 //   so
 // 2xa - a^2 = dOB^2 - dTB^2
 // x = (dOB^2 - dTB^2 + a^2)/(2a)
 // y = (dOB^2-x^2)^0.5
 real Bx = (dOB**2 - dTB**2 + dOT**2)/(2*dOT);
 pair B = (Bx,(dOB**2-Bx**2)**0.5)*u;
-Distance DOA = Distance(qO.center, A, L=Label("$0.050\U{m}$", align=S));
-Distance DTA = Distance(A, qT.center, L=Label("$0.050\U{m}$", align=S));
-Distance DOB = Distance(qO.center, B, L=Label("$0.080\U{m}$", align=NW));
-Distance DTB = Distance(B, qT.center, L=Label("$0.060\U{m}$", align=NE));
+Distance DOA = Distance(qO.center(), A, L=Label("$0.050\U{m}$", align=S));
+Distance DTA = Distance(A, qT.center(), L=Label("$0.050\U{m}$", align=S));
+Distance DOB = Distance(qO.center(), B, L=Label("$0.080\U{m}$", align=NW));
+Distance DTB = Distance(B, qT.center(), L=Label("$0.060\U{m}$", align=NE));
 
 DOA.draw(); DTA.draw(); DOB.draw(); DTB.draw();
 dot(A, L="$A$", align=S);
diff --git a/latex/problems/Young_and_Freedman_12/problem23.60.tex b/latex/problems/Young_and_Freedman_12/problem23.60.tex
index 2845875..dba52b1 100644
--- a/latex/problems/Young_and_Freedman_12/problem23.60.tex
+++ b/latex/problems/Young_and_Freedman_12/problem23.60.tex
@@ -18,8 +18,8 @@ real dy = 1.8*L*Cos(phi);
 int n=3;
 
 Charge q = pCharge(dir(-90+phi)*L*u, q=1, L="$q$");
-Wire wire = Wire((0,0), q.center);
-Angle theta = Angle(q.center, (0,0), (0,-1), L="$\theta$");
+Wire wire = Wire((0,0), q.center());
+Angle theta = Angle(q.center(), (0,0), (0,-1), L="$\theta$");
 Surface s = Surface((ds/2,0)*u, (-ds/2,0)*u);
 Wire right_plate = Wire((ds,0)*u, (ds,-dy)*u, outline=green);
 Wire left_plate = Wire((-ds,0)*u, (-ds,-dy)*u, outline=green);
@@ -31,7 +31,7 @@ right_plate.draw();
 s.draw();
 Ds.draw();
 wire.draw();
-draw((0,0)--(0,q.center.y), dashed);
+draw((0,0)--(0,q.center().y), dashed);
 q.draw();
 theta.draw();
 \end{asy}
diff --git a/latex/problems/Young_and_Freedman_12/problem23.63.tex b/latex/problems/Young_and_Freedman_12/problem23.63.tex
index 9e1e612..4acf00c 100644
--- a/latex/problems/Young_and_Freedman_12/problem23.63.tex
+++ b/latex/problems/Young_and_Freedman_12/problem23.63.tex
@@ -24,7 +24,7 @@ real dy = 2;
 int n=3;
 
 Charge q = nCharge((-1,0)*u, q=1);
-Vector v = Velocity(q.center, L="$v$");
+Vector v = Velocity(q.center(), L="$v$");
 Wire top_plate = Wire((0,0.5*dy)*u, (L,.5*dy)*u);
 Wire bottom_plate = Wire((0,-.5*dy)*u, (L,-.5*dy)*u);
 Wire screen = Wire((L+s,-.7*dy)*u, (L+s,+.7*dy)*u, L="screen");
diff --git a/latex/problems/Young_and_Freedman_12/problem27.35.tex b/latex/problems/Young_and_Freedman_12/problem27.35.tex
index 6b9ee4b..06decd7 100644
--- a/latex/problems/Young_and_Freedman_12/problem27.35.tex
+++ b/latex/problems/Young_and_Freedman_12/problem27.35.tex
@@ -18,9 +18,9 @@ Vector I = Vector((-.25u,.25u), .125u, red, "$I$");
 draw(scale(u)*((0,0)--(1,0)--(1,1)--(0,1)--cycle), blue);
 draw(scale(u)*((-.25,.25)--(.25,.25)--(.25,.75)--(1.25,.75)), red);
 I.draw();
-Dhorizontal.draw(labelangle=-90, labeloffset=8pt);
-Dvertical.draw(labelangle=-90, labeloffset=8pt);
-Dbend.draw(rotateLabel=false, labelangle=-90, labeloffset=22pt);
+Dhorizontal.draw();
+Dvertical.draw();
+Dbend.draw();
 \end{asy}
 \end{center}
 \end{problem*}
diff --git a/latex/problems/Young_and_Freedman_12/problem27.68.tex b/latex/problems/Young_and_Freedman_12/problem27.68.tex
index 7b59cb4..3be3fc4 100644
--- a/latex/problems/Young_and_Freedman_12/problem27.68.tex
+++ b/latex/problems/Young_and_Freedman_12/problem27.68.tex
@@ -30,7 +30,7 @@ real xB = xBar - Rh.len/2;
 for (i=0; i<n; i+=1) {
   Bs.push(BField((xB, yBstart+i*dy), mag=Rh.len));
   if (i == n-1)
-    Bs[i].L = "\vect{B}";
+    Bs[i].label = Label("\vect{B}", EndPoint, LeftSide);
 }
 for (i=0; i<Bs.length; i+=1) {
   Bs[i].draw();
diff --git a/latex/problems/Young_and_Freedman_12/problem27.73.tex b/latex/problems/Young_and_Freedman_12/problem27.73.tex
index ec47cc2..820b871 100644
--- a/latex/problems/Young_and_Freedman_12/problem27.73.tex
+++ b/latex/problems/Young_and_Freedman_12/problem27.73.tex
@@ -48,9 +48,9 @@ for (i=0; i<Bs.length; i+=1) {
 draw(scale(r)*unitcircle, Bs[0].outline+dashed);
 
 Distance Dwire = Distance((pLL+2*pLR)/3, (pUL+2pUR)/3, "$45.0\U{cm}$");
-Dwire.draw(rotateLabel=false, labeloffset=24pt);
+Dwire.draw();
 Distance DdB = Distance((+r,-r), (-r,-r), offset=-3mm, L="$75.0\U{cm}$");
-DdB.draw(rotateLabel=false, labeloffset=12pt);
+DdB.draw();
 \end{asy}
 \end{center}
 \end{problem*}
diff --git a/latex/problems/Young_and_Freedman_12/problem28.12.tex b/latex/problems/Young_and_Freedman_12/problem28.12.tex
index 85d4744..2b69360 100644
--- a/latex/problems/Young_and_Freedman_12/problem28.12.tex
+++ b/latex/problems/Young_and_Freedman_12/problem28.12.tex
@@ -23,8 +23,8 @@ real Xseg = 1u;
 Distance dtop = Distance((-Xsep,Ysep/2), (0,0), "$8.00\U{cm}$");
 Distance dbot = Distance((-Xsep,-Ysep/2), (0,0), "$8.00\U{cm}$");
 
-dtop.draw(labeloffset=8pt);
-dbot.draw(labeloffset=-8pt);
+dtop.draw();
+dbot.draw();
 dot("P", (0,0));
 
 
@@ -35,8 +35,8 @@ wbot.draw();
 wbot_seg.draw();
 TwoTerminal Ibot = current((0,-Ysep/2), 180, "$24.0\U{A}$");
 Distance dSegbot = Distance((-Xsep-Xseg/2,-Ysep/2), (-Xsep+Xseg/2,-Ysep/2),
-                            offset=2mm, "$1.50\U{mm}$");
-dSegbot.draw(labeloffset=-8pt);
+                            offset=2mm, L=Label("$1.50\U{mm}$", S));
+dSegbot.draw();
 
 
 Wire wtop_seg = Wire((-Xsep-Xseg/2, Ysep/2), (-Xsep+Xseg/2, Ysep/2), red);
@@ -46,8 +46,8 @@ wtop.draw();
 wtop_seg.draw();
 TwoTerminal Itop = current((Ibot.end.x,Ysep/2), "$12.0\U{A}$");
 Distance dSegtop = Distance((-Xsep-Xseg/2,Ysep/2), (-Xsep+Xseg/2,Ysep/2),
-                            offset=-2mm, "$1.50\U{mm}$");
-dSegtop.draw(labeloffset=8pt);
+                            offset=-2mm, Label("$1.50\U{mm}$", N));
+dSegtop.draw();
 
 \end{asy}
 \end{center}
diff --git a/latex/problems/Young_and_Freedman_12/problem28.62.tex b/latex/problems/Young_and_Freedman_12/problem28.62.tex
index 76f366c..644e94c 100644
--- a/latex/problems/Young_and_Freedman_12/problem28.62.tex
+++ b/latex/problems/Young_and_Freedman_12/problem28.62.tex
@@ -20,23 +20,24 @@ pen ipen = red+blue;
 Block Bt = Block((0,0), width=L, height=hBar, fill=yellow);
 Block Bb = Block((0,-d), width=L, height=hBar, fill=yellow);
 Spring Sl = Spring((-L/2,-d), (-L/2,0),
-                   deadLength=1mm, unstretchedLength=d, "k");
+    deadLength=1mm, unstretchedLength=d, L=Label("$k$", embed=Shift));
 Spring Sr = Spring((L/2,0), (L/2,-d),
-                   deadLength=1mm, unstretchedLength=d, "k");
+    deadLength=1mm, unstretchedLength=d, L=Label("$k$", embed=Shift));
 Vector It = Vector((0,Isep), dir=0, ipen);
 Vector Ib = Vector((0,-d-Isep), dir=180, ipen);
 
-Distance DL = Distance((-L/2,0), (L/2,0), offset=-2Isep, "$L$");
-Distance Dd = Distance((L/2,0), (L/2,-d), offset=-4Isep, "$d$");
+Distance DL = Distance((-L/2,0), (L/2,0), offset=-2Isep, Label("$L$", N));
+Distance Dd = Distance((L/2,0), (L/2,-d), offset=-4Isep,
+    Label("$d$", embed=Shift));
 
-Sl.draw(rotateLabel=false);
-Sr.draw(rotateLabel=false);
+Sl.draw();
+Sr.draw();
 Bt.draw();
 Bb.draw();
 It.draw();
 Ib.draw();
 DL.draw();
-Dd.draw(rotateLabel=false);
+Dd.draw();
 \end{asy}
 \end{center}
 \end{problem*}
diff --git a/latex/problems/Young_and_Freedman_12/problem29.10.tex b/latex/problems/Young_and_Freedman_12/problem29.10.tex
index a671c16..81410dc 100644
--- a/latex/problems/Young_and_Freedman_12/problem29.10.tex
+++ b/latex/problems/Young_and_Freedman_12/problem29.10.tex
@@ -38,11 +38,11 @@ v.draw();
 
 
 Distance Dw = Distance((-width/2,height/2), (width/2,height/2),
-                       offset=-6pt, "$30.0\U{cm}$");
+    offset=-6pt, Label("$30.0\U{cm}$", align=LeftSide));
 Distance Dh = Distance((-width/2,-height/2), (-width/2,height/2),
-                       offset=-6pt, "$40.0\U{cm}$");
-Dw.draw(labeloffset=8pt);
-Dh.draw(labeloffset=8pt);
+    offset=-6pt, Label("$40.0\U{cm}$", align=LeftSide));
+Dw.draw();
+Dh.draw();
 
 draw(scale(width/2,height/2)*((1,1)--(1,-1)--(-1,-1)--(-1,1)--cycle), yellow);
 \end{asy}
diff --git a/latex/problems/Young_and_Freedman_12/problem29.21.tex b/latex/problems/Young_and_Freedman_12/problem29.21.tex
index 0ae303e..24d809f 100644
--- a/latex/problems/Young_and_Freedman_12/problem29.21.tex
+++ b/latex/problems/Young_and_Freedman_12/problem29.21.tex
@@ -42,7 +42,7 @@ v.draw();
 
 pair A = scale(length/2)*rotate(angle)*(0,-1);
 pair B = scale(length/2)*rotate(angle)*(0,1);
-Distance L = Distance(A, B, offset=-6pt, "$L$");
+Distance L = Distance(A, B, offset=-6pt, L=Label("$L$", align=LeftSide));
 L.draw();
 
 draw(A--B, yellow);
diff --git a/latex/problems/Young_and_Freedman_12/problem29.25.tex b/latex/problems/Young_and_Freedman_12/problem29.25.tex
index 4b01253..1ff256a 100644
--- a/latex/problems/Young_and_Freedman_12/problem29.25.tex
+++ b/latex/problems/Young_and_Freedman_12/problem29.25.tex
@@ -53,8 +53,8 @@ label("$c$", (-width/2+xSep, ySep/2), N);
 label("$d$", (-width/2+xSep,-ySep/2), S);
 
 Distance D = Distance((width/2,ySep/2), (width/2,-ySep/2),
-                      offset=-6pt, "50.0\U{cm}");
-D.draw(labeloffset=8pt);
+    offset=-6pt, L=Label("$50.0\U{cm}$", align=LeftSide));
+D.draw();
 \end{asy}
 \end{center}
 \end{problem*}
diff --git a/latex/problems/wking/problem.sprung-pendulum.tex b/latex/problems/wking/problem.sprung-pendulum.tex
index 30c1850..05d575e 100644
--- a/latex/problems/wking/problem.sprung-pendulum.tex
+++ b/latex/problems/wking/problem.sprung-pendulum.tex
@@ -16,12 +16,11 @@ import Mechanics;
 real u = 1cm;
 
 Pendulum pA = makePendulum(angleDeg=-40, length=2u,
-                           angleL="$\theta$", stringL="$r$");
+    angleL="$\theta$", stringL=Label("$r$", embed=Shift));
 Pendulum pB = makePendulum(angleDeg=40, length=2u,
-                           angleL="$\theta$", stringL="$r$");
-Spring s = Spring(pFrom=pA.mass.center, pTo=pB.mass.center,
-                  unstretchedLength=abs(pA.mass.center.x)*2,
-                  L="$k$");
+    angleL="$\theta$", stringL=Label("$r$", align=LeftSide, embed=Shift));
+Spring s = Spring(pFrom=pA.mass.center(), pTo=pB.mass.center(),
+    unstretchedLength=abs(pA.mass.center().x)*2, L="$k$");
 Distance ds = Distance(pFrom=s.pFrom-(0,.7u),
                          pTo=s.pTo  -(0,.7u),
                            L="$d$");
@@ -29,8 +28,8 @@ s.draw();
 ds.draw();
 pA.draw(drawVertical=true);
 pB.draw();
-label("$m$", pA.mass.center);
-label("$m$", pB.mass.center);
+label("$m$", pA.mass.center());
+label("$m$", pB.mass.center());
 \end{asy}
 \end{center}
 \end{problem}
@@ -45,8 +44,8 @@ real u = 1cm;
 
 Pendulum p = makePendulum(angleDeg=-40, length=2u,
                           angleL="$\theta$", stringL="$r$");
-Spring s = Spring(pFrom=p.mass.center, pTo=(0,p.mass.center.y),
-                  unstretchedLength=abs(p.mass.center.x),
+Spring s = Spring(pFrom=p.mass.center(), pTo=(0,p.mass.center().y),
+                  unstretchedLength=abs(p.mass.center().x),
                   L="$2k$");
 Distance ds = Distance(pFrom=s.pFrom-(0,.7u),
                          pTo=s.pTo  -(0,.7u),
@@ -54,7 +53,7 @@ Distance ds = Distance(pFrom=s.pFrom-(0,.7u),
 s.draw();
 ds.draw();
 p.draw(drawVertical=true);
-label("$m$", p.mass.center);
+label("$m$", p.mass.center());
 \end{asy}
 \end{center}
 where the spring constant doubles, because when the left bob
@@ -76,12 +75,12 @@ real u = 1cm;
 
 Pendulum p = makePendulum(angleDeg=-40, length=2u,
                           angleL="$\theta$");
-Vector fs = Force(p.mass.center, dir=180, mag=1u, L="$F_s$");
-Vector fg = Force(p.mass.center, dir=-90, mag=1u, L="$F_g$");
-Vector dx = Vector(p.mass.center, dir=-40-180, mag=1.5u, L="$x'$");
-Vector dy = Vector(p.mass.center, dir=-40-90, mag=1.5u, L="$y'$");
-Angle xas = Angle(dx.pTip(), p.mass.center, fs.pTip(), L="$\theta$");
-Angle yag = Angle(dy.pTip(), p.mass.center, fg.pTip(), L="$\theta$");
+Vector fs = Force(p.mass.center(), dir=180, mag=1u, L="$F_s$");
+Vector fg = Force(p.mass.center(), dir=-90, mag=1u, L="$F_g$");
+Vector dx = Vector(p.mass.center(), dir=-40-180, mag=1.5u, L="$x'$");
+Vector dy = Vector(p.mass.center(), dir=-40-90, mag=1.5u, L="$y'$");
+Angle xas = Angle(dx.pTip(), p.mass.center(), fs.pTip(), L="$\theta$");
+Angle yag = Angle(dy.pTip(), p.mass.center(), fg.pTip(), L="$\theta$");
 
 xas.draw();
 yag.draw();
-- 
2.26.2