207921978b
Signed-off-by: Victor Seiji Hariki <victorseijih@gmail.com>
216 lines
5.6 KiB
JavaScript
216 lines
5.6 KiB
JavaScript
// Layering
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const imageCollection = layers.registerCollection(
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"image",
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{w: 2560, h: 1536},
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{
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name: "Image Layers",
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}
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);
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const bgLayer = imageCollection.registerLayer("bg", {
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name: "Background",
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});
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const imgLayer = imageCollection.registerLayer("image", {
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name: "Image",
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ctxOptions: {desynchronized: true},
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});
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const maskPaintLayer = imageCollection.registerLayer("mask", {
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name: "Mask Paint",
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ctxOptions: {desynchronized: true},
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});
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const ovLayer = imageCollection.registerLayer("overlay", {
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name: "Overlay",
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});
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const debugLayer = imageCollection.registerLayer("debug", {
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name: "Debug Layer",
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});
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const imgCanvas = imgLayer.canvas; // where dreams go
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const imgCtx = imgLayer.ctx;
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const maskPaintCanvas = maskPaintLayer.canvas; // where mouse cursor renders
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const maskPaintCtx = maskPaintLayer.ctx;
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maskPaintCanvas.classList.add("mask-canvas");
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const ovCanvas = ovLayer.canvas; // where mouse cursor renders
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const ovCtx = ovLayer.ctx;
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const debugCanvas = debugLayer.canvas; // where mouse cursor renders
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const debugCtx = debugLayer.ctx;
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/* WIP: Most cursors shouldn't need a zoomable canvas */
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/** @type {HTMLCanvasElement} */
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const uiCanvas = document.getElementById("layer-overlay"); // where mouse cursor renders
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uiCanvas.width = uiCanvas.clientWidth;
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uiCanvas.height = uiCanvas.clientHeight;
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const uiCtx = uiCanvas.getContext("2d", {desynchronized: true});
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debugLayer.hide(); // Hidden by default
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layers.registerCollection("mask", {name: "Mask Layers", requiresActive: true});
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// Where CSS and javascript magic happens to make the canvas viewport work
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/**
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* Ended up using a CSS transforms approach due to more flexibility on transformations
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* and capability to automagically translate input coordinates to layer space.
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*/
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mouse.registerContext(
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"world",
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(evn, ctx) => {
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// Fix because in chrome layerX and layerY simply doesnt work
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/** @type {HTMLDivElement} */
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const target = evn.target;
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// Get element bounding rect
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const bb = imageCollection.element.getBoundingClientRect();
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// Get element width/height (css, cause I don't trust client sizes in chrome anymore)
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const w = imageCollection.size.w;
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const h = imageCollection.size.h;
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// Get cursor position
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const x = evn.clientX;
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const y = evn.clientY;
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// Map to layer space
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const layerX = ((x - bb.left) / bb.width) * w;
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const layerY = ((y - bb.top) / bb.height) * h;
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//
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ctx.coords.prev.x = ctx.coords.pos.x;
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ctx.coords.prev.y = ctx.coords.pos.y;
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ctx.coords.pos.x = layerX;
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ctx.coords.pos.y = layerY;
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},
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{target: imageCollection.inputElement}
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);
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/**
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* The global viewport object (may be modularized in the future). All
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* coordinates given are of the center of the viewport
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*
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* cx and cy are the viewport's world coordinates, scaled to zoom level.
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* _x and _y are actual coordinates in the DOM space
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*
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* The transform() function does some transforms and writes them to the
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* provided element.
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*/
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const viewport = {
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get cx() {
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return this._x * this.zoom;
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},
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set cx(v) {
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return (this._x = v / this.zoom);
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},
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_x: 0,
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get cy() {
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return this._y * this.zoom;
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},
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set cy(v) {
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return (this._y = v / this.zoom);
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},
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_y: 0,
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zoom: 1,
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rotation: 0,
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get w() {
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return (window.innerWidth * 1) / this.zoom;
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},
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get h() {
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return (window.innerHeight * 1) / this.zoom;
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},
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viewToCanvas(x, y) {
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return {x, y};
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},
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canvasToView(x, y) {
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return {
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x: window.innerWidth * ((x - this.cx) / this.w) + window.innerWidth / 2,
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y: window.innerHeight * ((y - this.cy) / this.h) + window.innerHeight / 2,
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};
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},
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/**
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* Apply transformation
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*
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* @param {HTMLElement} el Element to apply CSS transform to
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*/
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transform(el) {
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el.style.transformOrigin = `${this.cx}px ${this.cy}px`;
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el.style.transform = `scale(${this.zoom}) translate(${-(
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this._x -
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this.w / 2
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)}px, ${-(this._y - this.h / 2)}px)`;
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},
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};
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viewport.cx = imageCollection.size.w / 2;
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viewport.cy = imageCollection.size.h / 2;
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let worldInit = null;
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viewport.transform(imageCollection.element);
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mouse.listen.window.onwheel.on((evn) => {
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if (evn.evn.ctrlKey) {
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evn.evn.preventDefault();
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const pcx = viewport.cx;
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const pcy = viewport.cy;
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if (evn.delta < 0) {
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viewport.zoom *= 1 + Math.abs(evn.delta * 0.0002);
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} else {
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viewport.zoom *= 1 - Math.abs(evn.delta * 0.0002);
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}
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viewport.cx = pcx;
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viewport.cy = pcy;
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viewport.transform(imageCollection.element);
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toolbar.currentTool.redraw();
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if (debug) {
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debugCtx.clearRect(0, 0, debugCanvas.width, debugCanvas.height);
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debugCtx.fillStyle = "#F0F";
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debugCtx.beginPath();
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debugCtx.arc(viewport.cx, viewport.cy, 5, 0, Math.PI * 2);
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debugCtx.fill();
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}
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}
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});
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mouse.listen.window.btn.middle.onpaintstart.on((evn) => {
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worldInit = {x: viewport.cx, y: viewport.cy};
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});
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mouse.listen.window.btn.middle.onpaint.on((evn) => {
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if (worldInit) {
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viewport.cx = worldInit.x + (evn.ix - evn.x) / viewport.zoom;
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viewport.cy = worldInit.y + (evn.iy - evn.y) / viewport.zoom;
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// Limits
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viewport.cx = Math.max(Math.min(viewport.cx, imageCollection.size.w), 0);
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viewport.cy = Math.max(Math.min(viewport.cy, imageCollection.size.h), 0);
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// Draw Viewport location
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}
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viewport.transform(imageCollection.element);
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if (debug) {
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debugCtx.clearRect(0, 0, debugCanvas.width, debugCanvas.height);
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debugCtx.fillStyle = "#F0F";
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debugCtx.beginPath();
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debugCtx.arc(viewport.cx, viewport.cy, 5, 0, Math.PI * 2);
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debugCtx.fill();
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}
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});
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mouse.listen.window.btn.middle.onpaintend.on((evn) => {
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worldInit = null;
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});
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window.addEventListener("resize", () => {
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viewport.transform(imageCollection.element);
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uiCanvas.width = uiCanvas.clientWidth;
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uiCanvas.height = uiCanvas.clientHeight;
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});
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