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Force reload tiles when the tile's flip doesn't match the image

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Flipping an image changes the bounds of each tile. The existing
code assumes that cannot happen. getTile() calculates the tile
bounds the first time it is asked for a particular tile. It then
caches and returns the same time on every subsequent call.

getTile() has a check to test if a tile exists in the cache. If
it does not, the tile is created and inserted. In order to make
tiles be rebuilt after a flip, we only need to check if the tile's
flip matches the image's flip. If not, we can recreate the tile
as if it did not exist.

To make this a bit clearer, the tile's flipped flag is now set
in getTile() rather than positionTile().

This makes setFlip() work.
This commit is contained in:
Alistair Buxton 2021-03-22 06:30:06 +00:00
parent 3161808a9d
commit 7552806a47
2 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
src/tiledimage.js
View File

@ -866,7 +866,6 @@ $.extend($.TiledImage.prototype, $.EventSource.prototype, /** @lends OpenSeadrag
setFlip: function(flip) {
this.flipped = !!flip;
this._needsDraw = true;
this._raiseBoundsChange();
},
/**
@ -1501,7 +1500,7 @@ function getTile(
tilesMatrix[ level ][ x ] = {};
}
if ( !tilesMatrix[ level ][ x ][ y ] ) {
if ( !tilesMatrix[ level ][ x ][ y ] || ((!!tilesMatrix[ level ][ x ][ y ].flipped) !== (!!tiledImage.flipped)) ) {
xMod = ( numTiles.x + ( x % numTiles.x ) ) % numTiles.x;
yMod = ( numTiles.y + ( y % numTiles.y ) ) % numTiles.y;
bounds = tiledImage.getTileBounds( level, x, y );
@ -1550,6 +1549,8 @@ function getTile(
tile.isBottomMost = true;
}
tile.flipped = tiledImage.flipped;
tilesMatrix[ level ][ x ][ y ] = tile;
}
@ -1749,7 +1750,6 @@ function positionTile( tile, overlap, viewport, viewportCenter, levelVisibility,
tile.size = sizeC;
tile.squaredDistance = tileSquaredDistance;
tile.visibility = levelVisibility;
tile.flipped = tiledImage.getFlip();
}
/**

4
test/demo/flipping.html
View File

@ -36,7 +36,7 @@
First
<div class="button">
<input type="checkbox" id="ffirst" onchange="flip(0, this.checked)">
<label for="ffirst">Flip (Partially Implemented)</label>
<label for="ffirst">Flip</label>
</div>
<div class="button">
<input type="checkbox" id="rfirst" onchange="rotate(0, this.checked * 45)">
@ -48,7 +48,7 @@
Second
<div class="button">
<input type="checkbox" id="fsecond" onchange="flip(1, this.checked)" checked>
<label for="fsecond">Flip (Partially Implemented)</label>
<label for="fsecond">Flip</label>
</div>
<div class="button">
<input type="checkbox" id="rsecond" onchange="rotate(1, this.checked * 45)">