457 lines
11 KiB
TypeScript
457 lines
11 KiB
TypeScript
import { FolkShape } from "./folk-shape";
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import { css, html } from "./tags";
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const styles = css`
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:host {
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background: white;
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border-radius: 8px;
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box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
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min-width: 360px;
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min-height: 420px;
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}
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.header {
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display: flex;
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align-items: center;
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justify-content: space-between;
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padding: 8px 12px;
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background: linear-gradient(135deg, #f97316, #eab308);
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color: white;
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border-radius: 8px 8px 0 0;
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font-size: 12px;
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font-weight: 600;
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cursor: move;
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}
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.header-title {
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display: flex;
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align-items: center;
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gap: 6px;
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}
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.header-actions {
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display: flex;
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gap: 4px;
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}
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.header-actions button {
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background: transparent;
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border: none;
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color: white;
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cursor: pointer;
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padding: 2px 6px;
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border-radius: 4px;
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font-size: 14px;
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}
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.header-actions button:hover {
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background: rgba(255, 255, 255, 0.2);
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}
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.content {
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display: flex;
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flex-direction: column;
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height: calc(100% - 36px);
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overflow: hidden;
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}
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.toolbar-row {
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display: flex;
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align-items: center;
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gap: 6px;
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padding: 8px 12px;
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border-bottom: 1px solid #e2e8f0;
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flex-wrap: wrap;
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}
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.tool-btn {
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width: 32px;
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height: 32px;
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display: flex;
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align-items: center;
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justify-content: center;
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border: 2px solid #e2e8f0;
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border-radius: 6px;
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background: white;
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cursor: pointer;
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font-size: 14px;
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transition: all 0.15s;
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}
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.tool-btn:hover {
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border-color: #f97316;
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}
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.tool-btn.active {
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border-color: #f97316;
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background: #fff7ed;
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}
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.color-swatch {
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width: 24px;
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height: 24px;
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border-radius: 50%;
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border: 2px solid #e2e8f0;
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cursor: pointer;
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transition: transform 0.1s;
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}
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.color-swatch:hover {
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transform: scale(1.2);
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}
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.color-swatch.active {
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border-color: #0f172a;
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transform: scale(1.15);
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}
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.size-slider {
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width: 80px;
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accent-color: #f97316;
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}
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.size-label {
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font-size: 11px;
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color: #64748b;
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min-width: 20px;
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}
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.canvas-area {
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flex: 1;
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position: relative;
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cursor: crosshair;
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overflow: hidden;
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}
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.canvas-area canvas {
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width: 100%;
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height: 100%;
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display: block;
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}
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.export-btn {
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padding: 6px 12px;
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background: #f97316;
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color: white;
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border: none;
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border-radius: 6px;
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font-size: 12px;
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font-weight: 600;
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cursor: pointer;
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}
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.export-btn:hover {
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opacity: 0.9;
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}
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`;
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const COLORS = ["#0f172a", "#ef4444", "#f97316", "#eab308", "#22c55e", "#3b82f6", "#8b5cf6", "#ec4899", "#ffffff"];
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interface Stroke {
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points: { x: number; y: number; pressure: number }[];
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color: string;
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size: number;
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tool: string;
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}
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declare global {
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interface HTMLElementTagNameMap {
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"folk-drawfast": FolkDrawfast;
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}
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}
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export class FolkDrawfast extends FolkShape {
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static override tagName = "folk-drawfast";
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static {
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const sheet = new CSSStyleSheet();
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const parentRules = Array.from(FolkShape.styles.cssRules)
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.map((r) => r.cssText)
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.join("\n");
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const childRules = Array.from(styles.cssRules)
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.map((r) => r.cssText)
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.join("\n");
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sheet.replaceSync(`${parentRules}\n${childRules}`);
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this.styles = sheet;
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}
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#strokes: Stroke[] = [];
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#currentStroke: Stroke | null = null;
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#canvas: HTMLCanvasElement | null = null;
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#ctx: CanvasRenderingContext2D | null = null;
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#color = "#0f172a";
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#brushSize = 4;
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#tool = "pen"; // pen | eraser
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#isDrawing = false;
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get strokes() {
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return this.#strokes;
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}
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override createRenderRoot() {
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const root = super.createRenderRoot();
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const wrapper = document.createElement("div");
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wrapper.innerHTML = html`
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<div class="header">
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<span class="header-title">
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<span>\u270F\uFE0F</span>
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<span>Drawfast</span>
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</span>
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<div class="header-actions">
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<button class="export-png-btn" title="Export PNG">\u{1F4BE}</button>
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<button class="close-btn" title="Close">\u00D7</button>
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</div>
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</div>
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<div class="content">
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<div class="toolbar-row">
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<button class="tool-btn active" data-tool="pen" title="Pen">\u270F\uFE0F</button>
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<button class="tool-btn" data-tool="eraser" title="Eraser">\u{1F9F9}</button>
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<span style="width:1px;height:20px;background:#e2e8f0;margin:0 2px"></span>
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${COLORS.map((c) => `<span class="color-swatch${c === "#0f172a" ? " active" : ""}" data-color="${c}" style="background:${c}"></span>`).join("")}
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<span style="width:1px;height:20px;background:#e2e8f0;margin:0 2px"></span>
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<input type="range" class="size-slider" min="1" max="24" value="4" />
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<span class="size-label">4</span>
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<span style="flex:1"></span>
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<button class="tool-btn" data-tool="clear" title="Clear all">\u{1F5D1}</button>
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</div>
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<div class="canvas-area">
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<canvas></canvas>
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</div>
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</div>
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`;
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const slot = root.querySelector("slot");
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const containerDiv = slot?.parentElement as HTMLElement;
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if (containerDiv) {
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containerDiv.replaceWith(wrapper);
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}
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this.#canvas = wrapper.querySelector(".canvas-area canvas") as HTMLCanvasElement;
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this.#ctx = this.#canvas.getContext("2d");
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const closeBtn = wrapper.querySelector(".close-btn") as HTMLButtonElement;
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const exportBtn = wrapper.querySelector(".export-png-btn") as HTMLButtonElement;
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const sizeSlider = wrapper.querySelector(".size-slider") as HTMLInputElement;
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const sizeLabel = wrapper.querySelector(".size-label") as HTMLElement;
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const canvasArea = wrapper.querySelector(".canvas-area") as HTMLElement;
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// Tool buttons
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wrapper.querySelectorAll(".tool-btn").forEach((btn) => {
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btn.addEventListener("click", (e) => {
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e.stopPropagation();
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const tool = (btn as HTMLElement).dataset.tool;
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if (tool === "clear") {
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this.#strokes = [];
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this.#redraw();
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return;
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}
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this.#tool = tool || "pen";
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wrapper.querySelectorAll(".tool-btn").forEach((b) => b.classList.remove("active"));
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if (tool !== "clear") btn.classList.add("active");
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});
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});
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// Color swatches
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wrapper.querySelectorAll(".color-swatch").forEach((swatch) => {
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swatch.addEventListener("click", (e) => {
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e.stopPropagation();
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this.#color = (swatch as HTMLElement).dataset.color || "#0f172a";
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wrapper.querySelectorAll(".color-swatch").forEach((s) => s.classList.remove("active"));
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swatch.classList.add("active");
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// Switch to pen when picking a color
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this.#tool = "pen";
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wrapper.querySelectorAll(".tool-btn").forEach((b) => b.classList.remove("active"));
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wrapper.querySelector('[data-tool="pen"]')?.classList.add("active");
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});
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});
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// Size slider
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sizeSlider.addEventListener("input", (e) => {
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e.stopPropagation();
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this.#brushSize = parseInt(sizeSlider.value);
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sizeLabel.textContent = sizeSlider.value;
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});
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sizeSlider.addEventListener("pointerdown", (e) => e.stopPropagation());
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// Drawing events
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this.#canvas.addEventListener("pointerdown", (e) => {
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e.stopPropagation();
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e.preventDefault();
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this.#isDrawing = true;
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this.#canvas!.setPointerCapture(e.pointerId);
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const pos = this.#getCanvasPos(e);
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this.#currentStroke = {
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points: [{ ...pos, pressure: e.pressure || 0.5 }],
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color: this.#tool === "eraser" ? "#ffffff" : this.#color,
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size: this.#tool === "eraser" ? this.#brushSize * 3 : this.#brushSize,
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tool: this.#tool,
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};
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});
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this.#canvas.addEventListener("pointermove", (e) => {
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if (!this.#isDrawing || !this.#currentStroke) return;
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e.stopPropagation();
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const pos = this.#getCanvasPos(e);
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this.#currentStroke.points.push({ ...pos, pressure: e.pressure || 0.5 });
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this.#drawStroke(this.#currentStroke);
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});
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const endDraw = (e: PointerEvent) => {
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if (!this.#isDrawing) return;
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this.#isDrawing = false;
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if (this.#currentStroke && this.#currentStroke.points.length > 0) {
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this.#strokes.push(this.#currentStroke);
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this.dispatchEvent(new CustomEvent("stroke-complete", {
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detail: { stroke: this.#currentStroke },
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}));
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}
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this.#currentStroke = null;
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};
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this.#canvas.addEventListener("pointerup", endDraw);
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this.#canvas.addEventListener("pointerleave", endDraw);
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// Export
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exportBtn.addEventListener("click", (e) => {
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e.stopPropagation();
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this.#exportPNG();
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});
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closeBtn.addEventListener("click", (e) => {
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e.stopPropagation();
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this.dispatchEvent(new CustomEvent("close"));
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});
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// Size canvas on next frame
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requestAnimationFrame(() => {
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this.#resizeCanvas(canvasArea);
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this.#redraw();
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});
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// Watch for resize
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const ro = new ResizeObserver(() => {
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this.#resizeCanvas(canvasArea);
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this.#redraw();
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});
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ro.observe(canvasArea);
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return root;
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}
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#resizeCanvas(container: HTMLElement) {
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if (!this.#canvas) return;
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const rect = container.getBoundingClientRect();
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if (rect.width > 0 && rect.height > 0) {
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this.#canvas.width = rect.width * devicePixelRatio;
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this.#canvas.height = rect.height * devicePixelRatio;
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this.#canvas.style.width = rect.width + "px";
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this.#canvas.style.height = rect.height + "px";
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if (this.#ctx) {
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this.#ctx.scale(devicePixelRatio, devicePixelRatio);
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}
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}
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}
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#getCanvasPos(e: PointerEvent): { x: number; y: number } {
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const rect = this.#canvas!.getBoundingClientRect();
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return {
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x: e.clientX - rect.left,
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y: e.clientY - rect.top,
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};
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}
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#drawStroke(stroke: Stroke) {
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if (!this.#ctx || stroke.points.length < 2) return;
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const ctx = this.#ctx;
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ctx.lineCap = "round";
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ctx.lineJoin = "round";
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ctx.strokeStyle = stroke.color;
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// Draw last segment for live drawing
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const len = stroke.points.length;
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const p0 = stroke.points[len - 2];
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const p1 = stroke.points[len - 1];
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const pressure = (p0.pressure + p1.pressure) / 2;
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ctx.lineWidth = stroke.size * (0.5 + pressure);
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if (stroke.tool === "eraser") {
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ctx.globalCompositeOperation = "destination-out";
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ctx.lineWidth = stroke.size * 3;
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} else {
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ctx.globalCompositeOperation = "source-over";
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}
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ctx.beginPath();
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ctx.moveTo(p0.x, p0.y);
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ctx.lineTo(p1.x, p1.y);
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ctx.stroke();
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ctx.globalCompositeOperation = "source-over";
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}
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#redraw() {
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if (!this.#ctx || !this.#canvas) return;
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const ctx = this.#ctx;
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const w = this.#canvas.width / devicePixelRatio;
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const h = this.#canvas.height / devicePixelRatio;
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ctx.clearRect(0, 0, w, h);
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// Fill white background
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ctx.fillStyle = "#ffffff";
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ctx.fillRect(0, 0, w, h);
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for (const stroke of this.#strokes) {
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if (stroke.points.length < 2) continue;
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ctx.lineCap = "round";
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ctx.lineJoin = "round";
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ctx.strokeStyle = stroke.color;
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if (stroke.tool === "eraser") {
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ctx.globalCompositeOperation = "destination-out";
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} else {
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ctx.globalCompositeOperation = "source-over";
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}
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for (let i = 1; i < stroke.points.length; i++) {
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const p0 = stroke.points[i - 1];
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const p1 = stroke.points[i];
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const pressure = (p0.pressure + p1.pressure) / 2;
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ctx.lineWidth = stroke.size * (0.5 + pressure);
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ctx.beginPath();
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ctx.moveTo(p0.x, p0.y);
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ctx.lineTo(p1.x, p1.y);
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ctx.stroke();
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}
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}
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ctx.globalCompositeOperation = "source-over";
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}
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#exportPNG() {
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if (!this.#canvas) return;
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const dataUrl = this.#canvas.toDataURL("image/png");
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const link = document.createElement("a");
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link.download = `drawfast-${Date.now()}.png`;
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link.href = dataUrl;
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link.click();
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}
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override toJSON() {
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return {
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...super.toJSON(),
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type: "folk-drawfast",
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strokes: this.#strokes.map((s) => ({
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points: s.points,
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color: s.color,
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size: s.size,
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tool: s.tool,
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})),
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};
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}
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}
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