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Fix #751. Main bug caused by doing subtraction before factoring in zoom

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Duncan Frost
2015-02-10 19:13:37 +00:00
parent 4b095b65d6
commit 00583d12e6
1 changed files with 5 additions and 2 deletions
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7
src/interface/viewport.c
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@@ -339,8 +339,11 @@ void sub_6E7DE1(sint16 x, sint16 y, rct_window* w, rct_viewport* viewport){
//return;
uint8 zoom = (1 << viewport->zoom);
sint16 x_diff = (viewport->view_x - x) / zoom;
sint16 y_diff = (viewport->view_y - y) / zoom;
// Note: do not do the subtraction and then divide!
// Note: Due to arithmatic shift != /zoom a shift will have to be used
// hopefully when 0x006E7FF3 is finished this can be converted to /zoom.
sint16 x_diff = (viewport->view_x >> viewport->zoom) - (x >> viewport->zoom);
sint16 y_diff = (viewport->view_y >> viewport->zoom) - (y >> viewport->zoom);
viewport->view_x = x;
viewport->view_y = y;