cpp/openttd-patchpack/source Changeset - r17657:64bea15c6ec5

Changeset - r17657:64bea15c6ec5

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frosch - 13 years ago 2011-05-08 18:20:21
frosch@openttd.org

(svn r22439) -Fix (r22291, r22426): Drawing lines of length zero failed.

1 file changed with 6 insertions and 0 deletions:

src/blitter/base.cpp

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src/blitter/base.cpp

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@@ @@ -33,12 +33,18 @@ void Blitter::DrawLine(void *video, int @@
 		dx = -dx;
 		stepx = -1;
 	} else {
 		stepx = 1;
+	}
 	if (dx == 0 && dy == 0) {
 		/* The algorithm below cannot handle this special case; make it work at least for line width 1 */
 		if (x >= 0 && x < screen_width && y >= 0 && y < screen_height) this->SetPixel(video, x, y, colour);
 		return;
+	}
 	int frac_diff = width * max(dx, dy);
 	if (width > 1) {
 		/* compute frac_diff = width * sqrt(dx*dx + dy*dy)
 		 * Start interval:
 		 *    max(dx, dy) <= sqrt(dx*dx + dy*dy) <= sqrt(2) * max(dx, dy) <= 3/2 * max(dx, dy) */
 		int frac_sq = width * width * (dx * dx + dy * dy);

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