Tilemaps.Components.IsometricCullTiles is a new function that culls tiles in a isometric map.

Author: photonstorm

src/tilemaps/components/IsometricCullTiles.js

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+/**
+ * @author       Richard Davey <rich@photonstorm.com>
+ * @copyright    2020 Photon Storm Ltd.
+ * @license      {@link https://opensource.org/licenses/MIT|MIT License}
+ */
+
+var CheckIsoBounds = require('./CheckIsoBounds');
+
+/**
+ * Returns the tiles in the given layer that are within the camera's viewport. This is used internally.
+ *
+ * @function Phaser.Tilemaps.Components.IsometricCullTiles
+ * @since 3.50.0
+ *
+ * @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.
+ * @param {integer} [renderOrder=0] - The rendering order constant.
+ *
+ * @return {Phaser.Tilemaps.Tile[]} An array of Tile objects.
+ */
+var IsometricCullTiles = function (layer, camera, outputArray, renderOrder)
+{
+    if (outputArray === undefined) { outputArray = []; }
+    if (renderOrder === undefined) { renderOrder = 0; }
+
+    outputArray.length = 0;
+
+    var tilemapLayer = layer.tilemapLayer;
+
+    var mapData = layer.data;
+    var mapWidth = layer.width;
+    var mapHeight = layer.height;
+
+    var drawLeft = 0;
+    var drawRight = mapWidth;
+    var drawTop = 0;
+    var drawBottom = mapHeight;
+
+    if (!tilemapLayer.skipCull)
+    {
+        var x;
+        var y;
+        var tile;
+
+        if (renderOrder === 0)
+        {
+            //  right-down
+
+            for (y = drawTop; y < drawBottom; y++)
+            {
+                for (x = drawLeft; mapData[y] && x < drawRight; x++)
+                {
+                    if (CheckIsoBounds(x,y,layer,camera))
+                    {
+                        tile = mapData[y][x];
+
+                        if (!tile || tile.index === -1 || !tile.visible || tile.alpha === 0)
+                        {
+                            continue;
+                        }
+
+                        outputArray.push(tile);
+                    }
+                }
+            }
+        }
+        else if (renderOrder === 1)
+        {
+            //  left-down
+
+            for (y = drawTop; y < drawBottom; y++)
+            {
+                for (x = drawRight; mapData[y] && x >= drawLeft; x--)
+                {
+                    if (CheckIsoBounds(x,y,layer,camera))
+                    {
+                        tile = mapData[y][x];
+
+                        if (!tile || tile.index === -1 || !tile.visible || tile.alpha === 0)
+                        {
+                            continue;
+                        }
+
+                        outputArray.push(tile);
+                    }
+                }
+            }
+        }
+        else if (renderOrder === 2)
+        {
+            //  right-up
+
+            for (y = drawBottom; y >= drawTop; y--)
+            {
+                for (x = drawLeft; mapData[y] && x < drawRight; x++)
+                {
+                    if (CheckIsoBounds(x,y,layer,camera))
+                    {
+                        tile = mapData[y][x];
+
+                        if (!tile || tile.index === -1 || !tile.visible || tile.alpha === 0)
+                        {
+                            continue;
+                        }
+
+                        outputArray.push(tile);
+                    }
+                }
+            }
+        }
+        else if (renderOrder === 3)
+        {
+            //  left-up
+
+            for (y = drawBottom; y >= drawTop; y--)
+            {
+                for (x = drawRight; mapData[y] && x >= drawLeft; x--)
+                {
+                    if (CheckIsoBounds(x,y,layer,camera))
+                    {
+                        tile = mapData[y][x];
+
+                        if (!tile || tile.index === -1 || !tile.visible || tile.alpha === 0)
+                        {
+                            continue;
+                        }
+
+                        outputArray.push(tile);
+                    }
+                }
+            }
+        }
+    }
+
+    tilemapLayer.tilesDrawn = outputArray.length;
+    tilemapLayer.tilesTotal = mapWidth * mapHeight;
+
+    return outputArray;
+};
+
+module.exports = IsometricCullTiles;