Stop the analysis pass in Loopy's redraw routine from being

[sgt/puzzles] / drawing.c

diff --git a/drawing.c b/drawing.c
index 4cbb46d..7f4a6cf 100644 (file)
--- a/drawing.c
+++ b/drawing.c
@@ -87,6 +87,34 @@ void draw_line(drawing *dr, int x1, int y1, int x2, int y2, int colour)
     dr->api->draw_line(dr->handle, x1, y1, x2, y2, colour);
 }
 
+void draw_thick_line(drawing *dr, float thickness,
+                    float x1, float y1, float x2, float y2, int colour)
+{
+    if (dr->api->draw_thick_line) {
+       dr->api->draw_thick_line(dr->handle, thickness,
+                                x1, y1, x2, y2, colour);
+    } else {
+       /* We'll fake it up with a filled polygon.  The tweak to the
+        * thickness empirically compensates for rounding errors, because
+        * polygon rendering uses integer coordinates.
+        */
+       float len = sqrt((x2 - x1)*(x2 - x1) + (y2 - y1)*(y2 - y1));
+       float tvhatx = (x2 - x1)/len * (thickness/2 - 0.2);
+       float tvhaty = (y2 - y1)/len * (thickness/2 - 0.2);
+       int p[8];
+
+       p[0] = x1 - tvhaty;
+       p[1] = y1 + tvhatx;
+       p[2] = x2 - tvhaty;
+       p[3] = y2 + tvhatx;
+       p[4] = x2 + tvhaty;
+       p[5] = y2 - tvhatx;
+       p[6] = x1 + tvhaty;
+       p[7] = y1 - tvhatx;
+       dr->api->draw_polygon(dr->handle, p, 4, colour, colour);
+    }
+}
+
 void draw_polygon(drawing *dr, int *coords, int npoints,
                   int fillcolour, int outlinecolour)
 {