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Add PNG export to web editor #30

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Add PNG export to web editor #30

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35 changes: 34 additions & 1 deletion packages/web/src/editor/editor.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,19 @@ function captureLabel(
return canvas;
}

function downloadCanvasAsPng(canvas: HTMLCanvasElement, filename: string): void {
canvas.toBlob((blob) => {
if (!blob) return;

const url = URL.createObjectURL(blob);
const link = document.createElement("a");
link.href = url;
link.download = filename;
link.click();
URL.revokeObjectURL(url);
}, "image/png");
}

function rotateCanvas90CW(src: HTMLCanvasElement): HTMLCanvasElement {
const dst = document.createElement("canvas");
dst.width = src.height;
Expand Down Expand Up @@ -74,6 +87,26 @@ export function Editor() {
return () => window.removeEventListener("beforeunload", h);
}, []);

const exportPng = useCallback(async (): Promise<void> => {
const stage = stageRef.current;
if (!stage) return;

const { label, currentLabelName } = useEditorV2Store.getState();

// Deselect to avoid selection handles in the exported image.
useEditorV2Store.getState().clearSelection();

// Wait a frame for Konva to re-render without selection handles.
await new Promise((r) => requestAnimationFrame(r));

const canvas = captureLabel(stage, label.widthPx, label.heightPx);

const filename =
(currentLabelName || "label").replace(/[^a-zA-Z0-9._-]+/g, "_") + ".png";

downloadCanvasAsPng(canvas, filename);
}, []);

const print = useCallback(async (copies: number): Promise<boolean> => {
const printer = getPrinter();
const stage = stageRef.current;
Expand Down Expand Up @@ -131,7 +164,7 @@ export function Editor() {

return (
<div className="w-screen h-screen flex flex-col overflow-hidden bg-ink-950 text-ink-100">
<TopChrome onPrint={print} />
<TopChrome onPrint={print} onExportPng={exportPng} />
<div className="relative flex-1 min-h-0 flex flex-col">
<Canvas ref={stageRef} />
<Inspector />
Expand Down
11 changes: 10 additions & 1 deletion packages/web/src/editor/top-chrome/top-chrome.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@ import {
Grid3x3,
Ruler,
Heart,
Download,
} from "lucide-react";
import { useEditorV2Store } from "../../store/editor-store.ts";
import { PrintButton } from "./print-button.tsx";
Expand All @@ -18,9 +19,10 @@ import logoSvg from "../../assets/logo.svg";

interface TopChromeProps {
onPrint: (copies: number) => Promise<boolean>;
onExportPng: () => Promise<void>;
}

export function TopChrome({ onPrint }: TopChromeProps) {
export function TopChrome({ onPrint, onExportPng }: TopChromeProps) {
const zoom = useEditorV2Store((s) => s.zoom);
const label = useEditorV2Store((s) => s.label);
const gridVisible = useEditorV2Store((s) => s.gridVisible);
Expand Down Expand Up @@ -81,6 +83,13 @@ export function TopChrome({ onPrint }: TopChromeProps) {
<a href="https://github.com/sponsors/tomLadder" target="_blank" rel="noopener noreferrer" className="w-8 h-8 flex items-center justify-center rounded-md text-pink-400 hover:bg-pink-500/10 hover:text-pink-300 hover-fade" title="Sponsor this project">
<Heart size={16} />
</a>
<button
onClick={onExportPng}
className="w-8 h-8 flex items-center justify-center rounded-md text-ink-300 hover:bg-ink-800 hover:text-ink-100"
title="Export PNG"
>
<Download size={16} />
</button>
<PrintButton onPrint={onPrint} />
</div>

Expand Down