mirror of
https://github.com/photonstorm/phaser
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44 lines
1.6 KiB
JavaScript
44 lines
1.6 KiB
JavaScript
/**
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* @author Richard Davey <rich@photonstorm.com>
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* @copyright 2020 Photon Storm Ltd.
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* @license {@link https://opensource.org/licenses/MIT|MIT License}
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*/
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/**
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* Converts from world X coordinates (pixels) to tile X coordinates (tile units), factoring in the
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* layer's position, scale and scroll.
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*
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* @function Phaser.Tilemaps.Components.WorldToTileX
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* @since 3.0.0
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*
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* @param {number} worldX - The x coordinate to be converted, in pixels, not tiles.
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* @param {boolean} [snapToFloor=true] - Whether or not to round the tile coordinate down to the nearest integer.
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* @param {Phaser.Cameras.Scene2D.Camera} [camera=main camera] - The Camera to use when calculating the tile index from the world values.
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* @param {Phaser.Tilemaps.LayerData} layer - The Tilemap Layer to act upon.
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*
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* @return {number} The X location in tile units.
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*/
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var WorldToTileX = function (worldX, snapToFloor, camera, layer)
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{
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if (snapToFloor === undefined) { snapToFloor = true; }
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var tileWidth = layer.baseTileWidth;
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var tilemapLayer = layer.tilemapLayer;
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if (tilemapLayer)
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{
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if (camera === undefined) { camera = tilemapLayer.scene.cameras.main; }
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// Find the world position relative to the static or dynamic layer's top left origin,
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// factoring in the camera's horizontal scroll
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worldX = worldX - (tilemapLayer.x + camera.scrollX * (1 - tilemapLayer.scrollFactorX));
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tileWidth *= tilemapLayer.scaleX;
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}
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return snapToFloor
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? Math.floor(worldX / tileWidth)
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: worldX / tileWidth;
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};
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module.exports = WorldToTileX;
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