mirror of
https://github.com/photonstorm/phaser
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53 lines
1.5 KiB
JavaScript
53 lines
1.5 KiB
JavaScript
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var GetTileAt = require('./GetTileAt');
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// Recalculate the faces, assuming only one tile location has been changed
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// Used internally to update faces quickly for PutTileAt/RemoveTileAt/etc. Alternate approach to
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// 951.
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var RecalculateFacesAt = function (tileX, tileY, layer)
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{
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var tile = GetTileAt(tileX, tileY, true, layer);
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var above = GetTileAt(tileX, tileY - 1, true, layer);
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var below = GetTileAt(tileX, tileY + 1, true, layer);
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var left = GetTileAt(tileX - 1, tileY, true, layer);
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var right = GetTileAt(tileX + 1, tileY, true, layer);
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var tileCollides = tile && tile.collides;
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// Assume the changed tile has all interesting edges
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if (tileCollides)
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{
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tile.faceBottom = true;
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tile.faceBottom = true;
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tile.faceLeft = true;
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tile.faceRight = true;
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}
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// Reset edges that are shared between tile and its neighbors
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if (above && above.collides)
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{
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if (tileCollides) { tile.faceTop = false; }
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above.faceBottom = !tileCollides;
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}
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if (below && below.collides)
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{
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if (tileCollides) { tile.faceBottom = false; }
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below.faceTop = !tileCollides;
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}
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if (left && left.collides)
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{
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if (tileCollides) { tile.faceLeft = false; }
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left.faceRight = !tileCollides;
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}
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if (right && right.collides)
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{
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if (tileCollides) { tile.faceRight = false; }
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right.faceLeft = !tileCollides;
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}
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return tile;
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};
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module.exports = RecalculateFacesAt;
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