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(svn r19104) -Fix (r19039): Stablize main view centering in smallmap.

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alberth 2010-02-12 13:46:41 +00:00
parent 47295bb8b9
commit dd1c72d39a
1 changed files with 38 additions and 7 deletions
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45
src/smallmap_gui.cpp
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@ -557,15 +557,16 @@ class SmallMapWindow : public Window {
/**
* Determine the tile relative to the base tile of the smallmap, and the pixel position at
* that tile for a point in the smallmap.
* @param px Horizontal coordinate of the pixel.
* @param py Vertical coordinate of the pixel.
* @param px Horizontal coordinate of the pixel.
* @param py Vertical coordinate of the pixel.
* @param sub[out] Pixel position at the tile (0..3).
* @param add_sub Add current #subscroll to the position.
* @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 px, int py, int *sub) const
FORCEINLINE Point PixelToTile(int px, int py, int *sub, bool add_sub = true) const
{
px += this->subscroll; // Total horizontal offset.
if (add_sub) 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. */
@ -586,6 +587,37 @@ class SmallMapWindow : public Window {
return pt;
}
/**
* Compute base parameters of the smallmap such that tile (\a tx, \a ty) starts at pixel (\a x, \a y).
* @param tx Tile x coordinate.
* @param ty Tile y coordinate.
* @param x Non-negative horizontal position in the display where the tile starts.
* @param y Non-negative vertical position in the display where the tile starts.
* @param sub [out] Value of #subscroll needed.
* @return #scroll_x, #scroll_y values.
*/
Point ComputeScroll(int tx, int ty, int x, int y, int *sub)
{
assert(x >= 0 && y >= 0);
int new_sub;
Point tile_xy = PixelToTile(x, y, &new_sub, false);
tx -= tile_xy.x;
ty -= tile_xy.y;
Point scroll;
if (new_sub == 0) {
*sub = 0;
scroll.x = (tx + this->zoom) * TILE_SIZE;
scroll.y = (ty - this->zoom) * TILE_SIZE;
} else {
*sub = 4 - new_sub;
scroll.x = (tx + 2 * this->zoom) * TILE_SIZE;
scroll.y = (ty - 2 * this->zoom) * TILE_SIZE;
}
return scroll;
}
/** Initialize or change the zoom level.
* @param change Way to change the zoom level.
* @param zoom_pt Position to keep fixed while zooming.
@ -1287,9 +1319,8 @@ public:
int sub;
const NWidgetBase *wid = this->GetWidget<NWidgetBase>(SM_WIDGET_MAP);
Point tile = this->PixelToTile(wid->current_x / 2, wid->current_y / 2, &sub);
this->SetNewScroll(pt.x - tile.x * TILE_SIZE, pt.y - tile.y * TILE_SIZE, sub);
Point sxy = this->ComputeScroll(pt.x / TILE_SIZE, pt.y / TILE_SIZE, max(0, (int)wid->current_x / 2 - 2), wid->current_y / 2, &sub);
this->SetNewScroll(sxy.x, sxy.y, sub);
this->SetDirty();
}
};