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(svn r19103) -Codechange: Use px/py for pixel coordinates in PixelToTile(), as promised by the documentation.

This commit is contained in:
alberth 2010-02-12 12:14:21 +00:00
parent d403d82617
commit 47295bb8b9
1 changed files with 9 additions and 9 deletions
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18
src/smallmap_gui.cpp
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@ -563,26 +563,26 @@ class SmallMapWindow : public Window {
* @return Tile being displayed at the given position relative to #scroll_x and #scroll_y.
* @note The #subscroll offset is already accounted for.
*/
FORCEINLINE Point PixelToTile(int dx, int dy, int *sub) const
FORCEINLINE Point PixelToTile(int px, int py, int *sub) const
{
dx += this->subscroll; // Total horizontal offset.
px += this->subscroll; // Total horizontal offset.
/* For each two rows down, add a x and a y tile, and
* For each four pixels to the right, move a tile to the right. */
Point pt = {((dy >> 1) - (dx >> 2)) * this->zoom, ((dy >> 1) + (dx >> 2)) * this->zoom};
dx &= 3;
Point pt = {((py >> 1) - (px >> 2)) * this->zoom, ((py >> 1) + (px >> 2)) * this->zoom};
px &= 3;
if (dy & 1) { // Odd number of rows, handle the 2 pixel shift.
if (dx < 2) {
if (py & 1) { // Odd number of rows, handle the 2 pixel shift.
if (px < 2) {
pt.x += this->zoom;
dx += 2;
px += 2;
} else {
pt.y += this->zoom;
dx -= 2;
px -= 2;
}
}
*sub = dx;
*sub = px;
return pt;
}