680 lines
17 KiB
JavaScript
680 lines
17 KiB
JavaScript
/**
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* This is a manager for the many canvas and content layers that compose the application
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*
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* It manages canvases and their locations and sizes according to current viewport views
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*/
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/**
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* Here is where the old magic is created.
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*
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* This is probably not recommended, but it works and
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* is probably the most reliable way to not break everything.
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*/
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(() => {
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const original = {
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drawImage: CanvasRenderingContext2D.prototype.drawImage,
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getImageData: CanvasRenderingContext2D.prototype.getImageData,
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putImageData: CanvasRenderingContext2D.prototype.putImageData,
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// Drawing methods
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moveTo: CanvasRenderingContext2D.prototype.moveTo,
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lineTo: CanvasRenderingContext2D.prototype.lineTo,
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arc: CanvasRenderingContext2D.prototype.arc,
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fillRect: CanvasRenderingContext2D.prototype.fillRect,
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clearRect: CanvasRenderingContext2D.prototype.clearRect,
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};
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// Backing up original functions to <key>Root
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Object.keys(original).forEach((key) => {
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CanvasRenderingContext2D.prototype[key + "Root"] = function (...args) {
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return original[key].call(this, ...args);
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};
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});
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// Add basic get bounding box support (canvas coordinates)
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Reflect.defineProperty(CanvasRenderingContext2D.prototype, "bb", {
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get: function () {
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return new BoundingBox({
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x: -this.origin.x,
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y: -this.origin.y,
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w: this.canvas.width,
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h: this.canvas.height,
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});
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},
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});
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// Modifying drawImage
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Reflect.defineProperty(CanvasRenderingContext2D.prototype, "drawImage", {
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value: function (...args) {
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switch (args.length) {
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case 3:
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case 5:
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if (this.origin !== undefined) {
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args[1] += this.origin.x;
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args[2] += this.origin.y;
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}
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break;
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case 9:
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// Check for origin on source
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const sctx = args[0].getContext && args[0].getContext("2d");
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if (sctx && sctx.origin !== undefined) {
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args[1] += sctx.origin.x;
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args[2] += sctx.origin.y;
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}
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// Check for origin on destination
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if (this.origin !== undefined) {
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args[5] += this.origin.x;
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args[6] += this.origin.y;
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}
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break;
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}
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// Pass arguments through
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return original.drawImage.call(this, ...args);
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},
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});
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// Modifying getImageData method
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Reflect.defineProperty(CanvasRenderingContext2D.prototype, "getImageData", {
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value: function (...args) {
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if (this.origin) {
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args[0] += this.origin.x;
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args[1] += this.origin.y;
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}
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// Pass arguments through
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return original.getImageData.call(this, ...args);
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},
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});
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// Modifying putImageData method
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Reflect.defineProperty(CanvasRenderingContext2D.prototype, "putImageData", {
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value: function (...args) {
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if (this.origin) {
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args[0] += this.origin.x;
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args[1] += this.origin.y;
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}
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// Pass arguments through
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return original.putImageData.call(this, ...args);
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},
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});
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// Modifying moveTo method
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Reflect.defineProperty(CanvasRenderingContext2D.prototype, "moveTo", {
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value: function (...args) {
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if (this.origin) {
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args[0] += this.origin.x;
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args[1] += this.origin.y;
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}
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// Pass arguments through
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return original.moveTo.call(this, ...args);
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},
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});
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// Modifying lineTo method
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Reflect.defineProperty(CanvasRenderingContext2D.prototype, "lineTo", {
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value: function (...args) {
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if (this.origin) {
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args[0] += this.origin.x;
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args[1] += this.origin.y;
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}
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// Pass arguments through
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return original.lineTo.call(this, ...args);
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},
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});
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// Modifying arc
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Reflect.defineProperty(CanvasRenderingContext2D.prototype, "arc", {
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value: function (...args) {
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if (this.origin) {
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args[0] += this.origin.x;
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args[1] += this.origin.y;
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}
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// Pass arguments through
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return original.arc.call(this, ...args);
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},
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});
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// Modifying fillRect
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Reflect.defineProperty(CanvasRenderingContext2D.prototype, "fillRect", {
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value: function (...args) {
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if (this.origin) {
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args[0] += this.origin.x;
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args[1] += this.origin.y;
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}
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// Pass arguments through
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return original.fillRect.call(this, ...args);
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},
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});
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// Modifying clearRect
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Reflect.defineProperty(CanvasRenderingContext2D.prototype, "clearRect", {
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value: function (...args) {
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if (this.origin) {
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args[0] += this.origin.x;
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args[1] += this.origin.y;
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}
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// Pass arguments through
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return original.clearRect.call(this, ...args);
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},
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});
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})();
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// End of black magic
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const layers = {
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_collections: [],
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collections: makeWriteOnce({}, "layers.collections"),
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listen: {
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oncollectioncreate: new Observer(),
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oncollectiondelete: new Observer(),
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onlayercreate: new Observer(),
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onlayerdelete: new Observer(),
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},
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// Registers a new collection
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// Layer collections are a group of layers (canvases) that are rendered in tandem. (same width, height, position, transform, etc)
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/**
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*
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* @param {string} key A key used to identify the collection
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* @param {Size} size The initial size of the collection in pixels (CSS size)
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* @param {object} options Extra options for the collection
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* @param {string} [options.name=key] The display name of the collection
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* @param {{key: string, options: object}} [options.initLayer] The configuration for the initial layer to be created
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* @param {number} [options.inputSizeMultiplier=9] Size of the input area element, in pixels
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* @param {HTMLElement} [options.targetElement] Element the collection will be inserted into
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* @param {Size} [options.resolution=size] The resolution of the collection (canvas size). Not sure it works.
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* @returns {LayerCollection} The newly created layer collection
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*/
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registerCollection: (key, size, options = {}) => {
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defaultOpt(options, {
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// Display name for the collection
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name: key,
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// Initial layer
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initLayer: {
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key: "default",
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options: {},
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},
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// Input multiplier (Size of the input element div)
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inputSizeMultiplier: 9,
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// Target
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targetElement: document.getElementById("layer-render"),
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// Resolution of the image
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resolution: size,
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});
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if (options.inputSizeMultiplier % 2 === 0) options.inputSizeMultiplier++;
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// Path used for logging purposes
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const _logpath = "layers.collections." + key;
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// Collection ID
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const id = guid();
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// Collection element
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const element = document.createElement("div");
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element.id = `collection-${id}`;
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element.style.width = `${size.w}px`;
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element.style.height = `${size.h}px`;
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element.classList.add("collection");
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// Input element (overlay element for input handling)
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const inputel = document.createElement("div");
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inputel.id = `collection-input-${id}`;
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inputel.addEventListener("mouseover", (evn) => {
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document.activeElement.blur();
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});
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inputel.classList.add("collection-input-overlay");
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element.appendChild(inputel);
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options.targetElement.appendChild(element);
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/** @type {LayerCollection} */
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const collection = makeWriteOnce(
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{
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id,
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_logpath,
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_layers: [],
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layers: {},
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key,
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name: options.name,
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element,
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inputElement: inputel,
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_inputOffset: null,
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get inputOffset() {
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return this._inputOffset;
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},
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_origin: {x: 0, y: 0},
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get origin() {
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return {...this._origin};
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},
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get bb() {
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return new BoundingBox({
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x: -this.origin.x,
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y: -this.origin.y,
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w: this.size.w,
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h: this.size.h,
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});
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},
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_resizeInputDiv() {
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// Set offset
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const oldOffset = {...this._inputOffset};
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this._inputOffset = {
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x:
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-Math.floor(options.inputSizeMultiplier / 2) * size.w -
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this._origin.x,
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y:
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-Math.floor(options.inputSizeMultiplier / 2) * size.h -
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this._origin.y,
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};
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// Resize the input element
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this.inputElement.style.left = `${this.inputOffset.x}px`;
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this.inputElement.style.top = `${this.inputOffset.y}px`;
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this.inputElement.style.width = `${
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size.w * options.inputSizeMultiplier
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}px`;
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this.inputElement.style.height = `${
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size.h * options.inputSizeMultiplier
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}px`;
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// Move elements inside to new offset
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for (const child of this.inputElement.children) {
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if (child.style.position === "absolute") {
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child.style.left = `${
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parseInt(child.style.left, 10) +
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oldOffset.x -
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this._inputOffset.x
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}px`;
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child.style.top = `${
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parseInt(child.style.top, 10) +
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oldOffset.y -
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this._inputOffset.y
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}px`;
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}
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}
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},
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/**
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* Expands the collection and its full layers by the specified amounts
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*
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* @param {number} left Pixels to expand left
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* @param {number} top Pixels to expand top
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* @param {number} right Pixels to expand right
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* @param {number} bottom Pixels to expand bottom
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*/
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expand(left, top, right, bottom) {
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this._layers.forEach((layer) => {
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if (layer.full) layer._expand(left, top, right, bottom);
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});
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this._origin.x += left;
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this._origin.y += top;
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this.size.w += left + right;
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this.size.h += top + bottom;
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this._resizeInputDiv();
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for (const layer of this._layers) {
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layer.moveTo(layer.x, layer.y);
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}
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},
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size,
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resolution: options.resolution,
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/**
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* Registers a new layer
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*
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* @param {string | null} key Name and key to use to access layer. If null, it is a temporary layer.
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* @param {object} options
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* @param {string} options.name
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* @param {?BoundingBox} options.bb
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* @param {string} [options.category]
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* @param {{w: number, h: number}} options.resolution
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* @param {?string} options.group
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* @param {object} options.after
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* @param {object} options.ctxOptions
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* @returns {Layer} The newly created layer
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*/
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registerLayer(key = null, options = {}) {
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// Make ID
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const id = guid();
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defaultOpt(options, {
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// Display name for the layer
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name: key || `Temporary ${id}`,
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// Bounding box for layer
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bb: {
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x: -collection.origin.x,
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y: -collection.origin.y,
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w: collection.size.w,
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h: collection.size.h,
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},
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// Category of the layer
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category: null,
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// Resolution for layer
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resolution: null,
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// Group for the layer ("group/subgroup/subsubgroup")
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group: null,
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// If set, will insert the layer after the given one
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after: null,
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// Context creation options
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ctxOptions: {},
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});
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// Check if the layer is full
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let full = false;
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if (
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options.bb.x === -collection.origin.x &&
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options.bb.y === -collection.origin.y &&
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options.bb.w === collection.size.w &&
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options.bb.h === collection.size.h
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)
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full = true;
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if (!options.resolution)
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// Calculate resolution
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options.resolution = {
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w: Math.round(
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(collection.resolution.w / collection.size.w) * options.bb.w
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),
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h: Math.round(
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(collection.resolution.h / collection.size.h) * options.bb.h
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),
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};
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// This layer's canvas
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// This is where black magic will take place in the future
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/**
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* @todo Use the canvas black arts to auto-scale canvas
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*/
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const canvas = document.createElement("canvas");
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canvas.id = `layer-${id}`;
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canvas.style.left = `${options.bb.x}px`;
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canvas.style.top = `${options.bb.y}px`;
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canvas.style.width = `${options.bb.w}px`;
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canvas.style.height = `${options.bb.h}px`;
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canvas.width = options.resolution.w;
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canvas.height = options.resolution.h;
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if (!options.after) collection.element.appendChild(canvas);
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else {
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options.after.canvas.after(canvas);
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}
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/**
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* Here we set the context origin for using the black magic.
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*/
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const ctx = canvas.getContext("2d", options.ctxOptions);
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if (full) {
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// Modify context to add origin information
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ctx.origin = {
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get x() {
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return collection.origin.x;
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},
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get y() {
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return collection.origin.y;
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},
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};
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}
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// Path used for logging purposes
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const _layerlogpath = key
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? _logpath + ".layers." + key
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: _logpath + ".layers[" + id + "]";
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const layer = makeWriteOnce(
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{
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_logpath: _layerlogpath,
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_collection: collection,
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_bb: new BoundingBox(options.bb),
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get bb() {
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return new BoundingBox(this._bb);
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},
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resolution: new Size(options.resolution),
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id,
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key,
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name: options.name,
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full,
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category: options.category,
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state: new Proxy(
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{visible: true},
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{
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set(obj, opt, val) {
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switch (opt) {
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case "visible":
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layer.canvas.style.display = val ? "block" : "none";
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break;
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}
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obj[opt] = val;
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},
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}
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),
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get x() {
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return this._bb.x;
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},
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get y() {
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return this._bb.y;
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},
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get width() {
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return this._bb.w;
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},
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get height() {
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return this._bb.h;
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},
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get w() {
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return this._bb.w;
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},
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get h() {
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return this._bb.h;
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},
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get origin() {
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return this._collection.origin;
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},
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get hidden() {
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return !this.state.visible;
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},
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/** Our canvas */
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canvas,
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ctx,
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/**
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* This is called by the collection when the layer must be expanded.
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*
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* Should NOT be called directly
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*
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* @param {number} left Pixels to expand left
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* @param {number} top Pixels to expand top
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* @param {number} right Pixels to expand right
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* @param {number} bottom Pixels to expand bottom
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*/
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_expand(left, top, right, bottom) {
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const tmpCanvas = document.createElement("canvas");
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tmpCanvas.width = this.w;
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tmpCanvas.height = this.h;
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tmpCanvas.getContext("2d").drawImage(this.canvas, 0, 0);
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this.resize(this.w + left + right, this.h + top + bottom);
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this.clear();
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this.ctx.drawImageRoot(tmpCanvas, left, top);
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this.moveTo(this.x - left, this.y - top);
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},
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/**
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* Clears the layer contents
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*/
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clear() {
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this.ctx.clearRectRoot(
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0,
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0,
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this.canvas.width,
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this.canvas.height
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);
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},
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/**
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* Recalculates DOM positioning
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*/
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syncDOM() {
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this.moveTo(this.x, this.y);
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this.resize(this.w, this.h);
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},
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/**
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* Moves this layer to another level (after given layer)
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*
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* @param {Layer} layer Will move layer to after this one
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*/
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moveAfter(layer) {
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layer.canvas.after(this.canvas);
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},
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/**
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* Moves this layer to another level (before given layer)
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*
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* @param {Layer} layer Will move layer to before this one
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*/
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moveBefore(layer) {
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layer.canvas.before(this.canvas);
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},
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/**
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* Moves this layer to another location
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*
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* @param {number} x X coordinate of the top left of the canvas
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* @param {number} y Y coordinate of the top left of the canvas
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*/
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moveTo(x, y) {
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this._bb.x = x;
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this._bb.y = y;
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this.canvas.style.left = `${x}px`;
|
|
this.canvas.style.top = `${y}px`;
|
|
},
|
|
|
|
/**
|
|
* Resizes layer in place
|
|
*
|
|
* @param {number} w New width
|
|
* @param {number} h New height
|
|
*/
|
|
resize(w, h) {
|
|
canvas.width = Math.round(
|
|
options.resolution.w * (w / options.bb.w)
|
|
);
|
|
canvas.height = Math.round(
|
|
options.resolution.h * (h / options.bb.h)
|
|
);
|
|
this._bb.w = w;
|
|
this._bb.h = h;
|
|
canvas.style.width = `${w}px`;
|
|
canvas.style.height = `${h}px`;
|
|
},
|
|
|
|
// Hides this layer (don't draw)
|
|
hide() {
|
|
this.canvas.style.display = "none";
|
|
},
|
|
// Hides this layer (don't draw)
|
|
unhide() {
|
|
this.canvas.style.display = "block";
|
|
},
|
|
},
|
|
_layerlogpath
|
|
);
|
|
|
|
// Add to indexers
|
|
if (!options.after) collection._layers.push(layer);
|
|
else {
|
|
const index = collection._layers.findIndex(
|
|
(l) => l === options.after
|
|
);
|
|
collection._layers.splice(index, 0, layer);
|
|
}
|
|
if (key) collection.layers[key] = layer;
|
|
|
|
if (key === null)
|
|
console.debug(
|
|
`[layers] Anonymous layer '${layer.name}' registered`
|
|
);
|
|
else
|
|
console.info(
|
|
`[layers] Layer '${layer.name}' at ${layer._logpath} registered`
|
|
);
|
|
|
|
layers.listen.onlayercreate.emit({
|
|
layer,
|
|
});
|
|
return layer;
|
|
},
|
|
|
|
/**
|
|
* Deletes a layer from the collection
|
|
*
|
|
* @param {Layer} layer Layer to delete
|
|
*/
|
|
deleteLayer: (layer) => {
|
|
const lobj = collection._layers.splice(
|
|
collection._layers.findIndex(
|
|
(l) => l.id === layer || l.id === layer.id
|
|
),
|
|
1
|
|
)[0];
|
|
if (!lobj) return;
|
|
|
|
layers.listen.onlayerdelete.emit({
|
|
layer: lobj,
|
|
});
|
|
if (lobj.key) delete collection.layers[lobj.key];
|
|
|
|
collection.element.removeChild(lobj.canvas);
|
|
|
|
if (lobj.key) console.info(`[layers] Layer '${lobj.key}' deleted`);
|
|
else console.debug(`[layers] Anonymous layer '${lobj.id}' deleted`);
|
|
},
|
|
},
|
|
_logpath,
|
|
["_inputOffset"]
|
|
);
|
|
|
|
collection._resizeInputDiv();
|
|
|
|
layers._collections.push(collection);
|
|
layers.collections[key] = collection;
|
|
|
|
console.info(
|
|
`[layers] Collection '${options.name}' at ${_logpath} registered`
|
|
);
|
|
|
|
return collection;
|
|
},
|
|
};
|