mirror of
https://github.com/lospec/pixel-editor.git
synced 2023-08-10 21:12:51 +03:00
271 lines
9.6 KiB
JavaScript
271 lines
9.6 KiB
JavaScript
/** TODO LIST FOR LAYERS
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GENERAL REQUIREMENTS:
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- The user shouldn't be able to draw on a hidden or locked layer
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- Must delete the selected layer when right clicking on a layer and selecting that option
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* We should think about selecting more than one layer at once.
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* Rename layer
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* Merge with bottom layer option
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* Flatten visible option
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* Flatten everything option
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- Must move a layer when dragging it in the layer list (https://codepen.io/retrofuturistic/pen/tlbHE)
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- When the user clicks on the eye icon, the icon must always be shown
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- When the user clicks on the lock icon, the icon must be always be shown
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- When a layer is locked or not visible, the corresponding icons are always shown
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- When saving an artwork, the layers must be flattened to a temporary layer, which is then exported and deleted
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- Saving the state of an artwork to a .lospec file so that people can work on it later keeping
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the layers they created? That'd be cool, even for the app users, that could just double click on a lospec
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file for it to be opened right in the pixel editor
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ADDITIONAL LOGIC TO MAKE IT WORK WITH THE REST OF THE CODE:
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- move the tmp layer so that it's always right below the active layer
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- when the move tool is selected (to move a selection), the tmp layer must be put right above the
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active layer to show a preview
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- mouse events will always have at least a canvas target, so evey time there's an event, we'll have to check
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the actual element type instead of the current layer and then apply the tool on the currentLayer, not on
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the first one in order of z-index
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- when changing the stroke colour, it should change for all the layers: it should already be happening,
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just make sure it is
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OPTIONAL:
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1 - Fix issues
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2 - Add a Replace feature so that people can replace a colour without editing the one in the palette
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(right click->replace colour in layers? in that case we'd have to implement multiple layers selection)
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KNOWN BUGS:
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1 - Must delete existing layers when creating a new pixel
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THINGS TO TEST:
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1 - Undo / redo
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2 - Copy / cut / paste selection
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3 - Colour picking from underlying layer
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4 - File export
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*/
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/*
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MORE TODO LIST:
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- Resize canvas (must make a simple editor to preview the changes)
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- Resize sprite
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*/
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// Will probably need a class to handle all the html stuff
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let layerList;
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let layerListEntry;
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let layerCount = 1;
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let maxZIndex = 3;
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on('click',"add-layer-button", function(){
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// Creating a new canvas
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let newCanvas = document.createElement("canvas");
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// Setting up the new canvas
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canvasView.append(newCanvas);
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maxZIndex++;
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newCanvas.style.zIndex = maxZIndex;
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newCanvas.classList.add("drawingCanvas");
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console.log("Tela creata: " + newCanvas);
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// Clone the default layer
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let toAppend = layerListEntry.cloneNode(true);
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// Setting the default name for the layer
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toAppend.getElementsByTagName('p')[0].innerHTML = "Layer " + layerCount;
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// Removing the selected class
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toAppend.classList.remove("selected-layer");
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// Adding the layer to the list
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layerCount++;
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// Creating a layer object
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let newLayer = new Layer(currentLayer.canvasSize[0], currentLayer.canvasSize[1], newCanvas, toAppend);
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newLayer.context.fillStyle = currentLayer.context.fillStyle;
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newLayer.copyData(currentLayer);
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layers.splice(layers.length - 3, 0, newLayer);
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// Insert it before the Add layer button
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layerList.insertBefore(toAppend, layerList.childNodes[0]);
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}, false);
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/** Handler class for a single canvas (a single layer)
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*
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* @param width Canvas width
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* @param height Canvas height
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* @param canvas HTML canvas element
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*/
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class Layer {
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constructor(width, height, canvas, menuEntry) {
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this.canvasSize = [width, height];
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this.canvas = canvas;
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this.context = this.canvas.getContext('2d');
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this.isSelected = false;
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this.isVisible = true;
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this.isLocked = false;
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this.menuEntry = menuEntry;
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if (menuEntry != null) {
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console.log("Aggiungo eventi");
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menuEntry.onclick = () => this.select();
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menuEntry.getElementsByTagName("button")[0].onclick = () => this.toggleLock();
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menuEntry.getElementsByTagName("button")[1].onclick = () => this.toggleVisibility();
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}
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this.initialize();
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}
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// Initializes the canvas
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initialize() {
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var maxHorizontalZoom = Math.floor(window.innerWidth/this.canvasSize[0]*0.75);
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var maxVerticalZoom = Math.floor(window.innerHeight/this.canvasSize[1]*0.75);
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zoom = Math.min(maxHorizontalZoom,maxVerticalZoom);
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if (zoom < 1) zoom = 1;
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//resize canvas
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this.canvas.width = this.canvasSize[0];
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this.canvas.height = this.canvasSize[1];
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this.canvas.style.width = (this.canvas.width*zoom)+'px';
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this.canvas.style.height = (this.canvas.height*zoom)+'px';
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//unhide canvas
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this.canvas.style.display = 'block';
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//center canvas in window
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this.canvas.style.left = 64+canvasView.clientWidth/2-(this.canvasSize[0]*zoom/2)+'px';
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this.canvas.style.top = 48+canvasView.clientHeight/2-(this.canvasSize[1]*zoom/2)+'px';
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this.context.imageSmoothingEnabled = false;
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this.context.mozImageSmoothingEnabled = false;
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}
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// Resizes canvas
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resize() {
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let newWidth = (this.canvas.width * zoom) + 'px';
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let newHeight = (this.canvas.height *zoom)+ 'px';
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this.canvas.style.width = newWidth;
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this.canvas.style.height = newHeight;
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}
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// Copies the otherCanvas' position and size
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copyData(otherCanvas) {
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this.canvas.style.width = otherCanvas.canvas.style.width;
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this.canvas.style.height = otherCanvas.canvas.style.height;
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this.canvas.style.left = otherCanvas.canvas.style.left;
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this.canvas.style.top = otherCanvas.canvas.style.top;
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}
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select() {
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// Deselecting the old layer
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currentLayer.deselect();
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// Selecting the current layer
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this.isSelected = true;
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this.menuEntry.classList.add("selected-layer");
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currentLayer = getLayerByName(this.menuEntry.getElementsByTagName("p")[0].innerHTML);
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}
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toggleLock() {
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if (this.isLocked) {
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console.log("unlocked");
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this.unlock();
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}
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else {
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console.log("locked");
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this.lock();
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}
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}
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toggleVisibility() {
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console.log(this);
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if (this.isVisible) {
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this.hide();
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}
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else {
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this.show();
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}
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}
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deselect() {
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this.isSelected = false;
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this.menuEntry.classList.remove("selected-layer");
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}
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lock() {
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this.isLocked = true;
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this.menuEntry.getElementsByClassName("layer-button")[0].style.visibility = "visible";
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this.menuEntry.getElementsByClassName("default-icon")[0].style.display = "none";
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this.menuEntry.getElementsByClassName("edited-icon")[0].style.display = "inline-block";
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}
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unlock() {
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this.isLocked = false;
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this.menuEntry.getElementsByClassName("layer-button")[0].style.visibility = "hidden";
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this.menuEntry.getElementsByClassName("default-icon")[0].style.display = "inline-block";
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this.menuEntry.getElementsByClassName("edited-icon")[0].style.display = "none";
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}
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show() {
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this.isVisible = true;
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this.canvas.style.visibility = "visible";
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this.menuEntry.getElementsByClassName("layer-button")[1].style.visibility = "hidden";
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// Changing icon
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this.menuEntry.getElementsByClassName("default-icon")[1].style.display = "inline-block";
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this.menuEntry.getElementsByClassName("edited-icon")[1].style.display = "none";
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}
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hide() {
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this.isVisible = false;
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this.canvas.style.visibility = "hidden";
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this.menuEntry.getElementsByClassName("layer-button")[1].style.visibility = "visible";
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// Changing icon
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this.menuEntry.getElementsByClassName("default-icon")[1].style.display = "none";
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this.menuEntry.getElementsByClassName("edited-icon")[1].style.display = "inline-block";
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}
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updateLayerPreview() {
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// Getting the canvas
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let destination = this.menuEntry.getElementsByTagName("canvas")[0];
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let widthRatio = this.canvasSize[0] / this.canvasSize[1];
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let heightRatio = this.canvasSize[1] / this.canvasSize[0];
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// Computing width and height for the preview image
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let previewWidth = destination.width;
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let previewHeight = destination.height;
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// If the sprite is rectangular, I apply the ratio to the preview as well
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if (widthRatio < 1) {
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previewWidth = destination.width * widthRatio;
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}
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else if (widthRatio > 1) {
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previewHeight = destination.height * heightRatio;
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}
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// La appiccico sulla preview
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destination.getContext('2d').clearRect(0, 0, destination.width, destination.height);
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destination.getContext('2d').drawImage(this.canvas,
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// This is necessary to center the preview in the canvas
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(destination.width - previewWidth) / 2, (destination.height - previewHeight) / 2,
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previewWidth, previewHeight);
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}
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}
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// Finds a layer given its name
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function getLayerByName(name) {
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for (let i=0; i<layers.length; i++) {
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if (layers[i].menuEntry != null) {
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if (layers[i].menuEntry.getElementsByTagName("p")[0].innerHTML == name) {
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return layers[i];
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}
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}
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}
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return null;
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} |