diff --git a/src/tilemaps/components/IsometricTileToWorldXY.js b/src/tilemaps/components/IsometricTileToWorldXY.js new file mode 100644 index 000000000..ffc6cc8ff --- /dev/null +++ b/src/tilemaps/components/IsometricTileToWorldXY.js @@ -0,0 +1,55 @@ +/** + * @author Richard Davey + * @copyright 2020 Photon Storm Ltd. + * @license {@link https://opensource.org/licenses/MIT|MIT License} + */ + +var Vector2 = require('../../math/Vector2'); + +/** + * Converts from isometric tile XY coordinates (tile units) to world XY coordinates (pixels), factoring in the + * layer's position, scale and scroll. This will return a new Vector2 object or update the given + * `point` object. + * + * @function Phaser.Tilemaps.Components.IsometricTileToWorldXY + * @since 3.50.0 + * + * @param {integer} tileX - The x coordinate, in tiles, not pixels. + * @param {integer} tileY - The y coordinate, in tiles, not pixels. + * @param {Phaser.Math.Vector2} [point] - A Vector2 to store the coordinates in. If not given a new Vector2 is created. + * @param {Phaser.Cameras.Scene2D.Camera} [camera=main camera] - The Camera to use when calculating the tile index from the world values. + * @param {Phaser.Tilemaps.LayerData} layer - The Tilemap Layer to act upon. + * + * @return {Phaser.Math.Vector2} The XY location in world coordinates. + */ +var IsometricTileToWorldXY = function (tileX, tileY, point, camera, layer) +{ + if (point === undefined) { point = new Vector2(); } + + var tileWidth = layer.baseTileWidth; + var tileHeight = layer.baseTileHeight; + var tilemapLayer = layer.tilemapLayer; + + var layerWorldX = 0; + var layerWorldY = 0; + + if (tilemapLayer) + { + if (camera === undefined) { camera = tilemapLayer.scene.cameras.main; } + + layerWorldX = tilemapLayer.x + camera.scrollX * (1 - tilemapLayer.scrollFactorX); + + tileWidth *= tilemapLayer.scaleX; + + layerWorldY = (tilemapLayer.y + camera.scrollY * (1 - tilemapLayer.scrollFactorY)); + + tileHeight *= tilemapLayer.scaleY; + } + + var x = layerWorldX + (tileX - tileY) * (tileWidth / 2); + var y = layerWorldY + (tileX + tileY) * (tileHeight / 2); + + return point.set(x, y); +}; + +module.exports = IsometricTileToWorldXY;