From 102fe0be9faa60e59d3703d53fd10db990fb8896 Mon Sep 17 00:00:00 2001
From: Filippos Karapetis
Date: Thu, 25 Aug 2016 11:57:08 +0300
Subject: GRAPHICS: Fix discrepancy in the thick line drawing function

The shortcuts for horizontal and vertical lines should draw the extra
thickness pixels around the line, not below it or to the right
---
 graphics/primitives.cpp | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

(limited to 'graphics')

diff --git a/graphics/primitives.cpp b/graphics/primitives.cpp
index ac1c58b1d8..a879fc9e45 100644
--- a/graphics/primitives.cpp
+++ b/graphics/primitives.cpp
@@ -108,15 +108,11 @@ void drawThickLine2(int x1, int y1, int x2, int y2, int thick, int color, void (
 	int dy = abs(y2 - y1);
 
 	if (dx == 0) {
-		if (y1 > y2)
-			SWAP(y1, y2);
-		Common::Rect r(x1, y1, x1 + thick - 1, y2);
+		Common::Rect r(x1 - thick / 2, MIN(y1, y2), x1 + thick / 2, MAX(y1, y2));
 		drawFilledRect(r, color, plotProc, data);
 		return;
 	} else if (dy == 0) {
-		if (x1 > x2)
-			SWAP(x1, x2);
-		Common::Rect r(x1, y1, x2, y1 + thick - 1);
+		Common::Rect r(MIN(x1, x2), y1 - thick / 2, MAX(x1, x2), y1 + thick / 2);
 		drawFilledRect(r, color, plotProc, data);
 		return;
 	}
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