mirror of
https://github.com/photonstorm/phaser
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150 lines
4 KiB
JavaScript
150 lines
4 KiB
JavaScript
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/**
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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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var CheckIsoBounds = require('./CheckIsoBounds');
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/**
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* Returns the tiles in the given layer that are within the camera's viewport. This is used internally.
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*
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* @function Phaser.Tilemaps.Components.IsoCullTiles
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* @private
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* @since 3.0.0
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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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* @param {array} [outputArray] - An optional array to store the Tile objects within.
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*
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* @return {Phaser.Tilemaps.Tile[]} An array of Tile objects.
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*/
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var IsoCullTiles = function (layer, camera, outputArray, renderOrder)
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{
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if (outputArray === undefined) { outputArray = []; }
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if (renderOrder === undefined) { renderOrder = 0; }
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outputArray.length = 0;
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var tilemapLayer = layer.tilemapLayer;
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var mapData = layer.data;
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var mapWidth = layer.width;
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var mapHeight = layer.height;
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var drawLeft = 0;
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var drawRight = mapWidth;
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var drawTop = 0;
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var drawBottom = mapHeight;
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if (!tilemapLayer.skipCull)
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{
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var x;
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var y;
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var tile;
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if (renderOrder === 0)
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{
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// right-down
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for (y = drawTop; y < drawBottom; y++)
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{
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for (x = drawLeft; mapData[y] && x < drawRight; x++)
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{
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if (CheckIsoBounds(x,y,layer,camera))
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{
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tile = mapData[y][x];
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if (!tile || tile.index === -1 || !tile.visible || tile.alpha === 0)
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{
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continue;
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}
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outputArray.push(tile);
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}
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}
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}
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}
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else if (renderOrder === 1)
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{
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// left-down
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for (y = drawTop; y < drawBottom; y++)
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{
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for (x = drawRight; mapData[y] && x >= drawLeft; x--)
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{
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if (CheckIsoBounds(x,y,layer,camera))
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{
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tile = mapData[y][x];
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if (!tile || tile.index === -1 || !tile.visible || tile.alpha === 0)
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{
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continue;
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}
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outputArray.push(tile);
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}
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}
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}
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}
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else if (renderOrder === 2)
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{
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// right-up
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for (y = drawBottom; y >= drawTop; y--)
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{
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for (x = drawLeft; mapData[y] && x < drawRight; x++)
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{
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if (CheckIsoBounds(x,y,layer,camera))
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{
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tile = mapData[y][x];
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if (!tile || tile.index === -1 || !tile.visible || tile.alpha === 0)
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{
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continue;
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}
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outputArray.push(tile);
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}
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}
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}
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}
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else if (renderOrder === 3)
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{
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// left-up
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for (y = drawBottom; y >= drawTop; y--)
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{
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for (x = drawRight; mapData[y] && x >= drawLeft; x--)
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{
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if (CheckIsoBounds(x,y,layer,camera))
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{
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tile = mapData[y][x];
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if (!tile || tile.index === -1 || !tile.visible || tile.alpha === 0)
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{
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continue;
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}
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outputArray.push(tile);
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}
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}
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}
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}
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}
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tilemapLayer.tilesDrawn = outputArray.length;
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tilemapLayer.tilesTotal = mapWidth * mapHeight;
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return outputArray;
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};
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module.exports = IsoCullTiles;
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