Basic Renderer

* Adds Tiled map JSON rendering
* TODO Cleanup & Organization

main.wren

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+import "graphics" for ImageData
+import "json" for Json
+import "graphics" for Canvas, Color
+import "./layerType" for LayerType
+import "dome" for Window
+import "math" for Math
+class Main {
+    construct new() {
+        _tileSheet = ImageData.loadFromFile("assets/tilemap_packed.png")
+        _tileSheetH = 128
+        _tileSheetW = 272
+        _tileH = 16
+        _tileW = 16
+        _rows = _tileSheetW/_tileW
+        _cols = _tileSheetH/_tileH
+        _levelData = Json.load("assets/level1.json")
+        _levelHeight = _levelData["tileheight"]
+        _levelWidth = _levelData["tilewidth"]
+        _layers = _levelData["layers"]       
+        Window.resize(256, 256)
+        Canvas.resize(256, 256)
+        
+    }
+
+    init() {
+
+    }
+
+    update() {
+
+    }
+
+    drawTile(tileIndex, mapX, mapY) {
+        var spriteX = (tileIndex % _rows)
+        var spriteY = Math.floor ((tileIndex - spriteX) % _cols)
+        _tileSheet.transform({
+            "srcX": spriteX * 16,
+            "srcY": spriteY * 16,
+            "srcW": _tileW,
+            "srcH": _tileH,
+            "scaleX": 1,
+            "scaleY": 1
+        }).draw(mapX*16,mapY*16)
+    }
+
+    drawLevel(x, y) {
+        for(layer in _layers) {
+            var index = 0        
+            for(levelY in 0...(_levelHeight)) {
+                for(levelX in 0...(_levelWidth)) {                    
+                    if((layer["type"] == LayerType.Tile) && (layer["visible"] == true)) {
+                        var tileIndex = layer["data"][index]
+                        if (tileIndex > 0) {
+                            drawTile(tileIndex-1, levelX, levelY)
+                        }
+                    }
+                  index = index + 1
+                }
+            }
+        }
+    }
+
+    getTile() {
+
+    }
+
+    draw(alpha) {
+        drawLevel(0,0)
+    }
+}
+
+var Game = Main.new()