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https://github.com/photonstorm/phaser
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42 lines
1.5 KiB
JavaScript
42 lines
1.5 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 Y coordinates (pixels) to tile Y 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.WorldToTileY
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* @since 3.0.0
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*
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* @param {number} worldY - The y coordinate to be converted, in pixels, not tiles.
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* @param {boolean} snapToFloor - Whether or not to round the tile coordinate down to the nearest integer.
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* @param {?Phaser.Cameras.Scene2D.Camera} 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 Y location in tile units.
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*/
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var WorldToTileY = function (worldY, snapToFloor, camera, layer)
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{
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if (snapToFloor === undefined) { snapToFloor = true; }
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var tileHeight = layer.baseTileHeight;
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var tilemapLayer = layer.tilemapLayer;
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if (tilemapLayer)
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{
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if (!camera) { 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 vertical scroll
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worldY = worldY - (tilemapLayer.y + camera.scrollY * (1 - tilemapLayer.scrollFactorY));
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tileHeight *= tilemapLayer.scaleY;
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}
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return (snapToFloor) ? Math.floor(worldY / tileHeight) : worldY / tileHeight;
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};
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module.exports = WorldToTileY;
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