lib/xmet/skew_t.py

@@ -49,27 +49,21 @@ class SkewTGraph():
 
         return factor * self.height
 
-    def draw_isobar(self, cr: cairo.Context,
-                    x: float,
-                    y: float,
-                    pressure: float):
-        sx, sy = self.graph_to_screen(-self.width / 2,
-                                      self.pressure_to_y(pressure))
-
-        cr.move_to(x + sx, y + sy)
-        cr.rel_line_to(self.width, 0)
-        cr.stroke()
-
     def draw_isobars(self, cr: cairo.Context, x: float, y: float):
         cr.save()
 
         cr.set_source_rgb(0.75, 0.75, 0.75)
 
         for pressure in range(PRESSURE_MIN, PRESSURE_MAX+1, PRESSURE_STEP):
+            coords = self.graph_to_screen(-self.width / 2,
+                                         self.pressure_to_y(pressure))
+
             if pressure % (2*PRESSURE_STEP) != 0:
                 continue
 
-            self.draw_isobar(cr, x, y, pressure)
+            cr.move_to(x + coords[0], y + coords[1])
+            cr.rel_line_to(self.width, 0)
+            cr.stroke()
 
         cr.restore()
 
@@ -169,11 +163,11 @@ class SkewTGraph():
         cr.stroke()
 
     def draw_sounding(self,
-                      cr: cairo.Context,
-                      x: float,
-                      y: float,
-                      sounding: Sounding,
-                      fn: Callable):
+                     cr: cairo.Context,
+                     x: float,
+                     y: float,
+                     sounding: Sounding,
+                     fn: Callable):
         cr.save()
 
         first = True