figures/stepper/step-size.asy: Restore piezo-approach labeling

I'd had this in the old MetaPost version, but now the positions are
automatic :).

diff --git a/src/figures/stepper/step-size.asy b/src/figures/stepper/step-size.asy
index 111a6ecef576d0ec59aa21218e6d53cacea3fb23..aa504c162b4a52e6237b9ff62471542ff494c505 100644 (file)
--- a/src/figures/stepper/step-size.asy
+++ b/src/figures/stepper/step-size.asy
@@ -64,6 +64,14 @@ for (i = 0; i < deflection.length; ++i) {
 int magic_i = 6;  /* pick one that looks pretty ;) */
 real gain = 20;   /* piezo volt per DAC volt */
 real sens = 7.57; /* piezo sensitivity nm per piezo volt */
+Label[] labels = {
+  Label("a", align=E),
+  Label("b", align=E),
+  Label("c", align=SE),
+  Label("d", align=SE),
+  Label("e", align=SE),
+  Label("f", align=SE),
+  };
 int j, k, start = -1;
 for (i = magic_i; i < calibration.length; ++i) {
   for (j = 0; j < calibration[i].piezo_approach.length; ++j) {
@@ -73,13 +81,14 @@ for (i = magic_i; i < calibration.length; ++i) {
         start = 0;
       }
       piezo_approach_t p0 = piezoApproach(calibration, i, start);
-      for (k = start; k < start + 6; ++k) {
+      for (k = start; k < start + labels.length; ++k) {
          if (k < calibration[i].piezo_approach.length) {
            piezo_approach_t p = piezoApproach(calibration, i, k);
            real[] x = piezo[p.start:p.stop] - piezo[p0.start];
            x = x * gain * sens;
            real[] y = deflection[p.start:p.stop] - deflection[p0.start];
            graphData(x=x, y=y, mpath=mcross, dots=true);
+           label(labels[k - start], (x[x.length-1], y[y.length-1]));
         }
       }
       break;  /* done with this stepper approach */