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Render the flipped columns in reverse order

Browse Source 
This completes the per-image flip implementation. Tile bounds are
re-positioned within the image. When rendering, the x ordinals are
remapped to the flipped ones.

To use, set "flipped" on the image instead of the viewer. The code
is compatible with rotations and wrapping.

Implements #1553
This commit is contained in:
Alistair Buxton 2020-10-31 00:23:41 +00:00
parent afa8c2d1bd
commit 3c57063632
1 changed files with 27 additions and 2 deletions
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29
src/tiledimage.js
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@ -404,6 +404,9 @@ $.extend($.TiledImage.prototype, $.EventSource.prototype, /** @lends OpenSeadrag
var xMod = ( numTiles.x + ( x % numTiles.x ) ) % numTiles.x;
var yMod = ( numTiles.y + ( y % numTiles.y ) ) % numTiles.y;
var bounds = this.source.getTileBounds(level, xMod, yMod);
if (this.getFlip()) {
bounds.x = 1 - bounds.x - bounds.width;
}
bounds.x += (x - xMod) / numTiles.x;
bounds.y += (this._worldHeightCurrent / this._worldWidthCurrent) * ((y - yMod) / numTiles.y);
return bounds;
@ -1279,10 +1282,32 @@ function updateLevel(tiledImage, haveDrawn, drawLevel, level, levelOpacity,
var viewportCenter = tiledImage.viewport.pixelFromPoint(
tiledImage.viewport.getCenter());
if (tiledImage.getFlip()) {
// The right-most tile can be narrower than the others. When flipped,
// this tile is now on the left. Because it is narrower than the normal
// left-most tile, the subsequent tiles may not be wide enough to completely
// fill the viewport. Fix this by rendering an extra column of tiles. If we
// are not wrapping, make sure we never render more than the number of tiles
// in the image.
bottomRightTile.x += 1;
if (!tiledImage.wrapHorizontal) {
bottomRightTile.x = Math.min(bottomRightTile.x, numberOfTiles.x - 1);
}
}
for (var x = topLeftTile.x; x <= bottomRightTile.x; x++) {
for (var y = topLeftTile.y; y <= bottomRightTile.y; y++) {
if (drawArea.intersection(tiledImage.getTileBounds(level, x, y)) === null) {
var flippedX;
if (tiledImage.getFlip()) {
var xMod = ( numberOfTiles.x + ( x % numberOfTiles.x ) ) % numberOfTiles.x;
flippedX = x + numberOfTiles.x - xMod - xMod - 1;
} else {
flippedX = x;
}
if (drawArea.intersection(tiledImage.getTileBounds(level, flippedX, y)) === null) {
// This tile is outside of the viewport, no need to draw it
continue;
}
@ -1291,7 +1316,7 @@ function updateLevel(tiledImage, haveDrawn, drawLevel, level, levelOpacity,
tiledImage,
drawLevel,
haveDrawn,
x, y,
flippedX, y,
level,
levelOpacity,
levelVisibility,