Added back pan and missing sprite scaling functions

Also fixed bug that let the user change the brush size to 0

js/ToolManager.js

@@ -3,8 +3,9 @@ const ToolManager = (() => {
     eraserTool = new EraserTool("eraser", {type: 'html'}, switchTool);
     rectangleTool = new RectangleTool("rectangle", {type: 'html'}, switchTool);
     lineTool = new LineTool("line", {type: 'html'}, switchTool);
-    fillTool = new FillTool("fill", {type: 'cursor', pic: 'fill.png'}, switchTool);
+    fillTool = new FillTool("fill", {type: 'cursor', style: 'crosshair'}, switchTool);
-    eyedropperTool = new EyedropperTool("eyedropper", {type: 'cursor', pic: 'none'}, switchTool);
+    eyedropperTool = new EyedropperTool("eyedropper", {type: 'cursor', style: 'crosshair'}, switchTool);
+    panTool = new PanTool("pan", {type: 'custom'}, switchTool);
 
     currTool = brushTool;
     currTool.onSelect();

js/_resizeSprite.js

@@ -296,3 +296,101 @@ function toggleRatio(event) {
 function changedAlgorithm(event) {
     currentAlgo = event.target.value;
 }
+
+/** Resizes an imageData depending on the algorithm and on the new width and height
+ * 
+ * @param {*} image The imageData to scale
+ * @param {*} width The new width of the imageData
+ * @param {*} height The new height of the imageData
+ * @param {*} algorithm Scaling algorithm chosen by the user in the dialogue
+ */
+ function resizeImageData (image, width, height, algorithm) {
+	algorithm = algorithm || 'bilinear-interpolation'
+  
+	let resize;
+	switch (algorithm) {
+	  	case 'nearest-neighbor': resize = nearestNeighbor; break
+	  	case 'bilinear-interpolation': resize = bilinearInterpolation; break
+	  	default: return image;
+	}
+  
+	const result = new ImageData(width, height)
+  
+	resize(image, result)
+  
+	return result
+}
+
+
+/** Nearest neighbor algorithm to scale a sprite
+ * 
+ * @param {*} src The source imageData
+ * @param {*} dst The destination imageData
+ */
+ function nearestNeighbor (src, dst) {
+	let pos = 0
+
+	// Just applying the nearest neighbor algorithm
+	for (let y = 0; y < dst.height; y++) {
+		for (let x = 0; x < dst.width; x++) {
+		const srcX = Math.floor(x * src.width / dst.width)
+		const srcY = Math.floor(y * src.height / dst.height)
+
+		let srcPos = ((srcY * src.width) + srcX) * 4
+
+		dst.data[pos++] = src.data[srcPos++] // R
+		dst.data[pos++] = src.data[srcPos++] // G
+		dst.data[pos++] = src.data[srcPos++] // B
+		dst.data[pos++] = src.data[srcPos++] // A
+		}
+	}
+}
+  
+/** Bilinear interpolation used to scale a sprite
+ * 
+ * @param {*} src The source imageData
+ * @param {*} dst The destination imageData
+ */
+function bilinearInterpolation (src, dst) {
+	// Applying the bilinear interpolation algorithm
+
+	function interpolate (k, kMin, kMax, vMin, vMax) {
+	  	return Math.round((k - kMin) * vMax + (kMax - k) * vMin)
+	}
+  
+	function interpolateHorizontal (offset, x, y, xMin, xMax) {
+	  	const vMin = src.data[((y * src.width + xMin) * 4) + offset]
+	  	if (xMin === xMax) return vMin
+  
+	  	const vMax = src.data[((y * src.width + xMax) * 4) + offset]
+	  	return interpolate(x, xMin, xMax, vMin, vMax)
+	}
+  
+	function interpolateVertical (offset, x, xMin, xMax, y, yMin, yMax) {
+	  	const vMin = interpolateHorizontal(offset, x, yMin, xMin, xMax)
+	  	if (yMin === yMax) return vMin
+  
+	  	const vMax = interpolateHorizontal(offset, x, yMax, xMin, xMax)
+	  	return interpolate(y, yMin, yMax, vMin, vMax)
+	}
+  
+	let pos = 0
+  
+	for (let y = 0; y < dst.height; y++) {
+	  	for (let x = 0; x < dst.width; x++) {
+			const srcX = x * src.width / dst.width
+			const srcY = y * src.height / dst.height
+	
+			const xMin = Math.floor(srcX)
+			const yMin = Math.floor(srcY)
+	
+			const xMax = Math.min(Math.ceil(srcX), src.width - 1)
+			const yMax = Math.min(Math.ceil(srcY), src.height - 1)
+	
+			dst.data[pos++] = interpolateVertical(0, srcX, xMin, xMax, srcY, yMin, yMax) // R
+			dst.data[pos++] = interpolateVertical(1, srcX, xMin, xMax, srcY, yMin, yMax) // G
+			dst.data[pos++] = interpolateVertical(2, srcX, xMin, xMax, srcY, yMin, yMax) // B
+			dst.data[pos++] = interpolateVertical(3, srcX, xMin, xMax, srcY, yMin, yMax) // A
+		}
+	}
+}

js/_toolButtons.js

@@ -27,11 +27,6 @@ Events.on('click',"ellipse-smaller-button", function(e){
         tool.ellipse.brushSize--;
 }, false);
 
-//pan
-Events.on('click',"pan-button", function(){
-    tool.pan.switchTo();
-}, false);
-
 //rectangular selection button
 Events.on('click', "rectselect-button", function(){
     tool.rectselect.switchTo();

js/_tools.js

@@ -104,7 +104,7 @@ class Tool {
 	}
 
 	decreaseSize() {
-		if (this.currSize > 0) {
+		if (this.currSize > 1) {
 			this.currSize--;
 			this.updateCursor();
 		}

js/tools/PanTool.js

@@ -0,0 +1,39 @@
+class PanTool extends Tool {
+
+    constructor(name, options, switchFunction) {
+        super(name, options);
+
+        Events.on('click', this.mainButton, switchFunction, this);
+    }
+
+    onStart(mousePos) {
+        super.onStart(mousePos);
+        canvasView.style.cursor = "url(\'/pixel-editor/pan-held.png\'), auto";
+	}
+
+	onDrag(mousePos) {
+        super.onDrag(mousePos);
+
+        // Setting first layer position
+        layers[0].setCanvasOffset(layers[0].canvas.offsetLeft + (mousePos[0] - this.startMousePos[0]), layers[0].canvas.offsetTop + (mousePos[1] - this.startMousePos[1]));
+        // Copying that position to the other layers
+        for (let i=1; i<layers.length; i++) {
+            layers[i].copyData(layers[0]);
+        }
+	}
+
+	onEnd(mousePos) {
+        super.onEnd(mousePos);
+
+        canvasView.style.cursor = "url(\'/pixel-editor/pan.png\'), auto";
+	}
+
+    onSelect() {
+        super.onSelect();        
+        canvasView.style.cursor = "url(\'/pixel-editor/pan.png\'), auto";
+    }
+
+    onDeselect() {
+        super.onDeselect();
+    }
+}