petern/OpenTTD
1
0
Fork 0
forked from mirror/OpenTTD
Code Pull Requests Activity

Codechange: Add InverseRemapCoords2 function for remapping viewport coordinates to underlying tile coordinates (Patch by adf88, #6583)

Browse Source
This commit is contained in:
Johannes E. Krause
2019-01-13 20:52:04 +01:00
committed by Niels Martin Hansen
parent 43852baace
commit f0290d5de7
4 changed files with 72 additions and 56 deletions
Download Patch File Download Diff File Expand all files Collapse all files

68
src/viewport.cpp
View File

@@ -399,65 +399,27 @@ ViewPort *IsPtInWindowViewport(const Window *w, int x, int y)
}
/**
* Translate screen coordinate in a viewport to a tile coordinate
* Translate screen coordinate in a viewport to underlying tile coordinate.
*
* Returns exact point of the map that is visible in the given place
* of the viewport (3D perspective), height of tiles and foundations matter.
*
* @param vp Viewport that contains the (\a x, \a y) screen coordinate
* @param x Screen x coordinate
* @param y Screen y coordinate
* @param clamp_to_map Clamp the coordinate outside of the map to the closest tile within the map.
* @return Tile coordinate
* @param x Screen x coordinate, distance in pixels from the left edge of viewport frame
* @param y Screen y coordinate, distance in pixels from the top edge of viewport frame
* @param clamp_to_map Clamp the coordinate outside of the map to the closest, non-void tile within the map
* @return Tile coordinate or (-1, -1) if given x or y is not within viewport frame
*/
Point TranslateXYToTileCoord(const ViewPort *vp, int x, int y, bool clamp_to_map)
{
Point pt;
int a, b;
int z;
if ( (uint)(x -= vp->left) >= (uint)vp->width ||
(uint)(y -= vp->top) >= (uint)vp->height) {
Point pt = {-1, -1};
return pt;
if (!IsInsideBS(x, vp->left, vp->width) || !IsInsideBS(y, vp->top, vp->height)) {
Point pt = { -1, -1 };
return pt;
}
x = (ScaleByZoom(x, vp->zoom) + vp->virtual_left) >> (2 + ZOOM_LVL_SHIFT);
y = (ScaleByZoom(y, vp->zoom) + vp->virtual_top) >> (1 + ZOOM_LVL_SHIFT);
a = y - x;
b = y + x;
if (clamp_to_map) {
/* Bring the coordinates near to a valid range. This is mostly due to the
* tiles on the north side of the map possibly being drawn too high due to
* the extra height levels. So at the top we allow a number of extra tiles.
* This number is based on the tile height and pixels. */
int extra_tiles = CeilDiv(_settings_game.construction.max_heightlevel * TILE_HEIGHT, TILE_PIXELS);
a = Clamp(a, -extra_tiles * TILE_SIZE, MapMaxX() * TILE_SIZE - 1);
b = Clamp(b, -extra_tiles * TILE_SIZE, MapMaxY() * TILE_SIZE - 1);
}
/* (a, b) is the X/Y-world coordinate that belongs to (x,y) if the landscape would be completely flat on height 0.
* Now find the Z-world coordinate by fix point iteration.
* This is a bit tricky because the tile height is non-continuous at foundations.
* The clicked point should be approached from the back, otherwise there are regions that are not clickable.
* (FOUNDATION_HALFTILE_LOWER on SLOPE_STEEP_S hides north halftile completely)
* So give it a z-malus of 4 in the first iterations.
*/
z = 0;
int min_coord = _settings_game.construction.freeform_edges ? TILE_SIZE : 0;
for (int i = 0; i < 5; i++) z = GetSlopePixelZ(Clamp(a + max(z, 4) - 4, min_coord, MapMaxX() * TILE_SIZE - 1), Clamp(b + max(z, 4) - 4, min_coord, MapMaxY() * TILE_SIZE - 1)) / 2;
for (int malus = 3; malus > 0; malus--) z = GetSlopePixelZ(Clamp(a + max(z, malus) - malus, min_coord, MapMaxX() * TILE_SIZE - 1), Clamp(b + max(z, malus) - malus, min_coord, MapMaxY() * TILE_SIZE - 1)) / 2;
for (int i = 0; i < 5; i++) z = GetSlopePixelZ(Clamp(a + z, min_coord, MapMaxX() * TILE_SIZE - 1), Clamp(b + z, min_coord, MapMaxY() * TILE_SIZE - 1)) / 2;
if (clamp_to_map) {
pt.x = Clamp(a + z, min_coord, MapMaxX() * TILE_SIZE - 1);
pt.y = Clamp(b + z, min_coord, MapMaxY() * TILE_SIZE - 1);
} else {
pt.x = a + z;
pt.y = b + z;
}
return pt;
return InverseRemapCoords2(
ScaleByZoom(x - vp->left, vp->zoom) + vp->virtual_left,
ScaleByZoom(y - vp->top, vp->zoom) + vp->virtual_top, clamp_to_map);
}
/* When used for zooming, check area below current coordinates (x,y)