phaser/src/tilemaps/components/CullTiles.js

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/**
* @author Richard Davey <rich@photonstorm.com>
* @copyright 2018 Photon Storm Ltd.
* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
*/
var SnapFloor = require('../../math/snap/SnapFloor');
var SnapCeil = require('../../math/snap/SnapCeil');
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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.CullTiles
* @private
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* @since 3.0.0
*
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* @param {Phaser.Tilemaps.LayerData} layer - The Tilemap Layer to act upon.
* @param {Phaser.Cameras.Scene2D.Camera} [camera] - The Camera to run the cull check against.
* @param {array} [outputArray] - An optional array to store the Tile objects within.
*
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* @return {Phaser.Tilemaps.Tile[]} An array of Tile objects.
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*/
var CullTiles = function (layer, camera, outputArray, renderOrder)
{
if (outputArray === undefined) { outputArray = []; }
if (renderOrder === undefined) { renderOrder = 0; }
outputArray.length = 0;
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var tilemap = layer.tilemapLayer.tilemap;
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var tilemapLayer = layer.tilemapLayer;
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var mapData = layer.data;
var mapWidth = layer.width;
var mapHeight = layer.height;
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// We need to use the tile sizes defined for the map as a whole, not the layer,
// in order to calculate the bounds correctly. As different sized tiles may be
// placed on the grid and we cannot trust layer.baseTileWidth to give us the true size.
var tileW = Math.floor(tilemap.tileWidth * tilemapLayer.scaleX);
var tileH = Math.floor(tilemap.tileHeight * tilemapLayer.scaleY);
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var drawLeft = 0;
var drawRight = mapWidth;
var drawTop = 0;
var drawBottom = mapHeight;
if (!tilemapLayer.skipCull && tilemapLayer.scrollFactorX === 1 && tilemapLayer.scrollFactorY === 1)
{
// Camera world view bounds, snapped for scaled tile size
// Cull Padding values are given in tiles, not pixels
var boundsLeft = SnapFloor(camera.worldView.x - tilemapLayer.x, tileW, 0, true) - tilemapLayer.cullPaddingX;
var boundsRight = SnapCeil(camera.worldView.right - tilemapLayer.x, tileW, 0, true) + tilemapLayer.cullPaddingX;
var boundsTop = SnapFloor(camera.worldView.y - tilemapLayer.y, tileH, 0, true) - tilemapLayer.cullPaddingY;
var boundsBottom = SnapCeil(camera.worldView.bottom - tilemapLayer.y, tileH, 0, true) + tilemapLayer.cullPaddingY;
drawLeft = Math.max(0, boundsLeft);
drawRight = Math.min(mapWidth, boundsRight);
drawTop = Math.max(0, boundsTop);
drawBottom = Math.min(mapHeight, boundsBottom);
}
var x;
var y;
var tile;
if (renderOrder === 0)
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{
// right-down
for (y = drawTop; y < drawBottom; y++)
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{
for (x = drawLeft; x < drawRight; x++)
{
tile = mapData[y][x];
if (!tile || tile.index === -1 || !tile.visible || tile.alpha === 0)
{
continue;
}
outputArray.push(tile);
}
}
}
else if (renderOrder === 1)
{
// left-down
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for (y = drawTop; y < drawBottom; y++)
{
for (x = drawRight; x >= drawLeft; x--)
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{
tile = mapData[y][x];
if (!tile || tile.index === -1 || !tile.visible || tile.alpha === 0)
{
continue;
}
outputArray.push(tile);
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}
}
}
else if (renderOrder === 2)
{
// right-up
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for (y = drawBottom; y >= drawTop; y--)
{
for (x = drawLeft; x < drawRight; x++)
{
tile = mapData[y][x];
if (!tile || tile.index === -1 || !tile.visible || tile.alpha === 0)
{
continue;
}
outputArray.push(tile);
}
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}
}
else if (renderOrder === 3)
{
// left-up
for (y = drawBottom; y >= drawTop; y--)
{
for (x = drawRight; x >= drawLeft; x--)
{
tile = mapData[y][x];
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if (!tile || tile.index === -1 || !tile.visible || tile.alpha === 0)
{
continue;
}
outputArray.push(tile);
}
}
}
tilemapLayer.tilesDrawn = outputArray.length;
tilemapLayer.tilesTotal = mapWidth * mapHeight;
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return outputArray;
};
module.exports = CullTiles;