diff --git a/lib/xmet/hodograph.py b/lib/xmet/hodograph.py
index b3552ee..008d770 100644
--- a/lib/xmet/hodograph.py
+++ b/lib/xmet/hodograph.py
@@ -29,12 +29,20 @@ class Hodograph():
         self.height = min(width, height)
         self.radius = min(width, height) * self.zoom
 
+    def sample_to_graph(self, wind_speed: dir, wind_dir: float) -> tuple:
+        r = self.radius * (wind_speed / WIND_SPEED_MAX)
+
+        x = r * math.cos(radians(wind_dir))
+        y = r * math.sin(radians(wind_dir))
+
+        return x, y
+
     def sample_to_screen(self, wind_speed: dir, wind_dir: float) -> tuple:
-        r = self.radius * min(wind_speed, WIND_SPEED_MAX) / WIND_SPEED_MAX
+        gx, gy = self.sample_to_graph(wind_speed, wind_dir)
 
         return (
-            self.offset_x * self.width  + r * math.cos(radians(wind_dir)),
-            self.offset_y * self.height + r * math.sin(radians(wind_dir))
+            self.offset_x * self.width  + gx,
+            self.offset_y * self.height + gy
         )
 
     def draw_speed_lines(self, cr: cairo.Context, x, y):