326 lines
11 KiB
JavaScript
326 lines
11 KiB
JavaScript
// TODO: add undo for layer drag n drop
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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 or the ID of the canvas related to the layer
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*/
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class Layer {
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static layerCount = 1;
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static maxZIndex = 3;
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static unusedIDs = [];
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static currentID = 1;
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static layerOptions = document.getElementById("layer-properties-menu");
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// TODO: this is simply terrible. menuEntry can either be an HTML element, a string or undefined.
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// If it's an HTML element it is added, if it's a string nothing happens, if it's undefined the
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// first menuEntry is used (the one that appears on load)
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constructor(width, height, canvas, menuEntry) {
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// REFACTOR: the canvas should actually be a Canvas instance
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this.canvas = Util.getElement(canvas);
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this.canvas.width = width;
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this.canvas.height = height;
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// REFACTOR: the context could be an attribute of the canvas class, but it's a bit easier
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// to just type layer.context, we should discuss this
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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.oldLayerName = null;
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if (typeof menuEntry == "string")
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this.menuEntry = document.getElementById("layers-menu").firstElementChild;
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else if (menuEntry !== undefined)
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this.menuEntry = menuEntry;
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let id = Layer.unusedIDs.pop();
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if (id == null) {
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id = Layer.currentID;
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Layer.currentID++;
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}
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this.id = "layer" + id;
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// Binding the events
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if (this.menuEntry !== undefined) {
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this.name = this.menuEntry.getElementsByTagName("p")[0].innerHTML;
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this.menuEntry.id = "layer" + id;
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this.menuEntry.onmouseover = () => this.hover();
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this.menuEntry.onmouseout = () => this.unhover();
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this.menuEntry.onclick = () => this.selectLayer();
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this.menuEntry.getElementsByTagName("button")[0].onclick = () => this.toggleLock();
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this.menuEntry.getElementsByTagName("button")[1].onclick = () => this.toggleVisibility();
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this.menuEntry.addEventListener("mouseup", this.openOptionsMenu, false);
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this.menuEntry.addEventListener("dragstart", this.layerDragStart, false);
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this.menuEntry.addEventListener("drop", this.layerDragDrop, false);
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this.menuEntry.addEventListener("dragover", this.layerDragOver, false);
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this.menuEntry.addEventListener("dragleave", this.layerDragLeave, false);
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this.menuEntry.addEventListener("dragend", this.layerDragEnd, false);
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Events.onCustom("del", this.tryDelete.bind(this));
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this.menuEntry.getElementsByTagName("canvas")[0].getContext('2d').imageSmoothingEnabled = false;
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}
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this.initialize();
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}
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hasCanvas() {
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return this.menuEntry != null;
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}
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tryDelete() {
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if (Input.getLastTarget() != this.menuEntry && Input.getLastTarget().parentElement != this.menuEntry)
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return;
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LayerList.deleteLayer();
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}
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// Initializes the canvas
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initialize() {
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//resize canvas
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this.canvas.style.width = (this.canvas.width*currFile.zoom)+'px';
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this.canvas.style.height = (this.canvas.height*currFile.zoom)+'px';
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//show 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+currFile.canvasView.clientWidth/2-(currFile.canvasSize[0]*currFile.zoom/2)+'px';
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this.canvas.style.top = 48+currFile.canvasView.clientHeight/2-(currFile.canvasSize[1]*currFile.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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rename() {
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this.menuEntry.getElementsByTagName("p")[0].setAttribute("contenteditable", false);
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if (this.oldLayerName != null) {
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let name = this.menuEntry.getElementsByTagName("p")[0].innerHTML;
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for (let i=0; i<currFile.layers.length; i++) {
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if (name === currFile.layers[i].name) {
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name += ' (1)';
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i = 0;
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}
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}
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this.name = name;
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this.menuEntry.getElementsByTagName("p")[0].innerHTML = name;
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new HistoryState().RenameLayer(this.oldLayerName, name, currFile.currentLayer);
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this.oldLayerName = null;
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}
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}
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hover() {
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// Hides all the layers but the current one
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for (let i=1; i<currFile.layers.length - nAppLayers; i++) {
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if (currFile.layers[i] !== this) {
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currFile.layers[i].canvas.style.opacity = 0.3;
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}
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}
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}
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unhover() {
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// Shows all the layers again
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for (let i=1; i<currFile.layers.length - nAppLayers; i++) {
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if (currFile.layers[i] !== this) {
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currFile.layers[i].canvas.style.opacity = 1;
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}
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}
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}
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setID(id) {
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this.id = id;
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if (this.menuEntry != null) {
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this.menuEntry.id = id;
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}
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}
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// Resizes canvas
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resize() {
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let newWidth = (this.canvas.width * currFile.zoom) + 'px';
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let newHeight = (this.canvas.height *currFile.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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setCanvasOffset (offsetLeft, offsetTop) {
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//horizontal offset
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var minXOffset = -currFile.canvasSize[0] * currFile.zoom;
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var maxXOffset = window.innerWidth - 300;
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if (offsetLeft < minXOffset)
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this.canvas.style.left = minXOffset +'px';
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else if (offsetLeft > maxXOffset)
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this.canvas.style.left = maxXOffset +'px';
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else
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this.canvas.style.left = offsetLeft +'px';
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//vertical offset
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var minYOffset = -currFile.canvasSize[1] * currFile.zoom + 164;
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var maxYOffset = window.innerHeight - 100;
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if (offsetTop < minYOffset)
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this.canvas.style.top = minYOffset +'px';
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else if (offsetTop > maxYOffset)
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this.canvas.style.top = maxYOffset +'px';
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else
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this.canvas.style.top = offsetTop +'px';
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}
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// Copies the otherLayer's position and size
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copyData(otherLayer) {
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this.canvas.style.width = otherLayer.canvas.style.width;
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this.canvas.style.height = otherLayer.canvas.style.height;
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this.canvas.style.left = otherLayer.canvas.style.left;
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this.canvas.style.top = otherLayer.canvas.style.top;
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}
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selectLayer(layer) {
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if (layer == null) {
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// Deselecting the old layer
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currFile.currentLayer.deselectLayer();
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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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currFile.currentLayer = LayerList.getLayerByName(this.menuEntry.getElementsByTagName("p")[0].innerHTML);
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}
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else {
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currFile.currentLayer.deselectLayer();
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layer.isSelected = true;
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layer.menuEntry.classList.add("selected-layer");
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currFile.currentLayer = layer;
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}
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}
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toggleLock() {
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if (this.isLocked) {
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this.unlock();
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}
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else {
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this.lock();
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}
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}
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toggleVisibility() {
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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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deselectLayer() {
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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 = currFile.canvasSize[0] / currFile.canvasSize[1];
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let heightRatio = currFile.canvasSize[1] / currFile.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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drawLine(x0,y0,x1,y1, brushSize) {
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var dx = Math.abs(x1-x0);
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var dy = Math.abs(y1-y0);
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var sx = (x0 < x1 ? 1 : -1);
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var sy = (y0 < y1 ? 1 : -1);
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var err = dx-dy;
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while (true) {
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//set pixel
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// If the current tool is the brush
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if (ToolManager.currentTool().name == 'brush' || ToolManager.currentTool().name == 'rectangle' || ToolManager.currentTool().name == 'ellipse') {
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// I fill the rect
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currFile.currentLayer.context.fillRect(x0-Math.floor(brushSize/2), y0-Math.floor(brushSize/2), brushSize, brushSize);
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} else if (ToolManager.currentTool().name == 'eraser') {
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// In case I'm using the eraser I must clear the rect
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currFile.currentLayer.context.clearRect(x0-Math.floor(brushSize/2), y0-Math.floor(brushSize/2), brushSize, brushSize);
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}
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//if we've reached the end goal, exit the loop
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if ((x0==x1) && (y0==y1)) break;
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var e2 = 2*err;
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if (e2 >-dy) {
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err -=dy;
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x0+=sx;
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}
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if (e2 < dx) {
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err +=dx;
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y0+=sy;
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}
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}
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}
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} |