mirror of
https://github.com/photonstorm/phaser
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50 lines
2.1 KiB
JavaScript
50 lines
2.1 KiB
JavaScript
/**
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* @author Richard Davey <rich@photonstorm.com>
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* @copyright 2013-2023 Photon Storm Ltd.
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* @license {@link https://opensource.org/licenses/MIT|MIT License}
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*/
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var Rectangle = require('../../geom/rectangle/Rectangle');
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var SnapCeil = require('../../math/snap/SnapCeil');
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var SnapFloor = require('../../math/snap/SnapFloor');
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var bounds = new Rectangle();
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/**
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* Returns the bounds in the given orthogonal layer that are within the cameras viewport.
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* This is used internally by the cull tiles function.
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*
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* @function Phaser.Tilemaps.Components.CullBounds
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* @since 3.50.0
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*
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* @param {Phaser.Tilemaps.LayerData} layer - The Tilemap Layer to act upon.
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* @param {Phaser.Cameras.Scene2D.Camera} camera - The Camera to run the cull check against.
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*
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* @return {Phaser.Geom.Rectangle} A rectangle containing the culled bounds. If you wish to retain this object, clone it, as it's recycled internally.
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*/
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var CullBounds = function (layer, camera)
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{
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var tilemap = layer.tilemapLayer.tilemap;
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var tilemapLayer = layer.tilemapLayer;
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// We need to use the tile sizes defined for the map as a whole, not the layer,
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// in order to calculate the bounds correctly. As different sized tiles may be
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// placed on the grid and we cannot trust layer.baseTileWidth to give us the true size.
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var tileW = Math.floor(tilemap.tileWidth * tilemapLayer.scaleX);
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var tileH = Math.floor(tilemap.tileHeight * tilemapLayer.scaleY);
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var boundsLeft = SnapFloor(camera.worldView.x - tilemapLayer.x, tileW, 0, true) - tilemapLayer.cullPaddingX;
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var boundsRight = SnapCeil(camera.worldView.right - tilemapLayer.x, tileW, 0, true) + tilemapLayer.cullPaddingX;
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var boundsTop = SnapFloor(camera.worldView.y - tilemapLayer.y, tileH, 0, true) - tilemapLayer.cullPaddingY;
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var boundsBottom = SnapCeil(camera.worldView.bottom - tilemapLayer.y, tileH, 0, true) + tilemapLayer.cullPaddingY;
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return bounds.setTo(
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boundsLeft,
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boundsTop,
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(boundsRight - boundsLeft),
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(boundsBottom - boundsTop)
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);
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};
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module.exports = CullBounds;
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