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-rw-r--r--src/viewport.cpp9
1 files changed, 7 insertions, 2 deletions
diff --git a/src/viewport.cpp b/src/viewport.cpp
index f73f5f817..800d2d359 100644
--- a/src/viewport.cpp
+++ b/src/viewport.cpp
@@ -1723,8 +1723,13 @@ static void SetSelectionTilesDirty()
int bot_y = top_y;
do {
- Point top = RemapCoords2(top_x, top_y); // topmost dirty point
- Point bot = RemapCoords2(bot_x + TILE_SIZE - 1, bot_y + TILE_SIZE - 1); // bottommost point
+ /* topmost dirty point */
+ TileIndex top_tile = TileVirtXY(top_x, top_y);
+ Point top = RemapCoords(top_x, top_y, GetTileMaxZ(top_tile));
+
+ /* bottommost point */
+ TileIndex bottom_tile = TileVirtXY(bot_x, bot_y);
+ Point bot = RemapCoords(bot_x + TILE_SIZE, bot_y + TILE_SIZE, GetTileZ(bottom_tile)); // bottommost point
/* the 'x' coordinate of 'top' and 'bot' is the same (and always in the same distance from tile middle),
* tile height/slope affects only the 'y' on-screen coordinate! */