mirror of
https://github.com/photonstorm/phaser
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70 lines
2.1 KiB
JavaScript
70 lines
2.1 KiB
JavaScript
/**
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* @author Richard Davey <rich@photonstorm.com>
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* @copyright 2019 Photon Storm Ltd.
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* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
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*/
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var GetTileAt = require('./GetTileAt');
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/**
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* Calculates interesting faces at the given tile coordinates of the specified layer. Interesting
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* faces are used internally for optimizing collisions against tiles. This method is mostly used
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* internally to optimize recalculating faces when only one tile has been changed.
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*
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* @function Phaser.Tilemaps.Components.CalculateFacesAt
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* @private
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* @since 3.0.0
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*
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* @param {integer} tileX - The x coordinate.
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* @param {integer} tileY - The y coordinate.
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* @param {Phaser.Tilemaps.LayerData} layer - The Tilemap Layer to act upon.
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*/
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var CalculateFacesAt = 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.faceTop = 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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if (tile && !tile.collides) { tile.resetFaces(); }
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return tile;
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};
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module.exports = CalculateFacesAt;
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