Add boxes.text() and use it in drillbox.py

boxes.py

@@ -705,6 +705,28 @@ class Boxes:
             self.corner(-90, r)
             self.edge(d)
 
+    @restore
+    def text(self, text, x=0, y=0, angle=0, align=""):
+        self.moveTo(x, y, angle)
+        (tx, ty, width, height, dx, dy) = self.ctx.text_extents(text)
+        align = align.split()
+        moves = {
+            "top" : (0, -height),
+            "middle" : (0, -0.5*height),
+            "bottom" : (0, 0),
+            "left" : (0, 0),
+            "center" : (-0.5*width, 0),
+            "right" : (-width, 0),
+        }
+        for a in align:
+            if a in moves:
+                self.moveTo(*moves[a])
+            else:
+                raise ValueError("Unknown alignment: %s" % align)
+
+        self.ctx.scale(1, -1)
+        self.ctx.show_text(text)
+
     @restore
     def NEMA(self, size, x=0, y=0, angle=0):
         nema = {

drillbox.py

@@ -29,12 +29,10 @@ class Box(Boxes):
         for i in range(4):
             for j in range(6):
                 self.rectangularHole(i*60+30, 20*j+10, 58, 14+1*j)
-                self.ctx.save()
-                self.ctx.move_to(i*60+14, 19*j+6)
                 d = 2.5-0.5*i+2*j
-                self.ctx.scale(1,-1)
-                self.ctx.show_text("%.1f" % d)
-                self.ctx.restore()
+                self.text("%.1f" % d, i*60+20, 19*j+6,
+                          align="center")
+
 
     def render(self):
         x, y, h = self.x, self.y, self.h