TOOLS/stats-conv: slightly better color

pyqtgraph's intColor() is less than ideal, especially on white
background. Can't see anything.

Unfortunately the rendering of the legend can't be fixed, because
pyqtgraph is terrible and hardcodes its rendering, including colors.

TOOLS/stats-conv.py

@@ -40,7 +40,7 @@ class G:
     events = {}
     start = None
     markers = ["o", "s", "t", "d"]
-    curveno = 0
+    curveno = {}
 
 def find_marker():
     if len(G.markers) == 0:
@@ -66,6 +66,10 @@ def get_event(event, evtype):
         G.events[event] = e
     return G.events[event]
 
+colors = [(0.0, 0.5, 0.0), (0.0, 0.0, 1.0), (0.0, 0.0, 0.0), (1.0, 0.0, 0.0), (0.75, 0.75, 0), (0.0, 0.75, 0.75), (0.75, 0, 0.75)]
+def mkColor(t):
+    return pg.mkColor(int(t[0] * 255), int(t[1] * 255), int(t[2] * 255))
+
 SCALE = 1e6 # microseconds to seconds
 
 for line in [line.split("#")[0].strip() for line in open(filename, "r")]:
@@ -152,8 +156,10 @@ for e in G.sevents:
         args['symbol'] = e.marker
         args['pen'] = None
     else:
-        args['pen'] = pg.mkPen(pg.intColor(G.curveno), width=0)
-        G.curveno += 1
+        if not cur in G.curveno:
+            G.curveno[cur] = 0
+        args['pen'] = pg.mkPen(mkColor(colors[G.curveno[cur] % len(colors)]), width=0)
+        G.curveno[cur] += 1
     n = cur.plot([x for x,y in e.vals], [y for x,y in e.vals], **args)
 
 QtGui.QApplication.instance().exec_()