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113 lines
3.1 KiB
113 lines
3.1 KiB
const CanvasKitInit = require('./bin/canvaskit.js');
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const fs = require('fs');
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const path = require('path');
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CanvasKitInit({
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locateFile: (file) => __dirname + '/bin/'+file,
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}).then((CanvasKit) => {
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let canvas = CanvasKit.MakeCanvas(300, 300);
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let img = fs.readFileSync(path.join(__dirname, 'test.png'));
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img = canvas.decodeImage(img);
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let fontData = fs.readFileSync(path.join(__dirname, './Roboto-Regular.woff'));
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canvas.loadFont(fontData, {
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'family': 'Roboto',
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'style': 'normal',
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'weight': '400',
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});
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let ctx = canvas.getContext('2d');
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ctx.font = '30px Roboto';
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ctx.rotate(.1);
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ctx.fillText('Awesome ', 50, 100);
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ctx.strokeText('Groovy!', 250, 100);
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// Draw line under Awesome
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ctx.strokeStyle = 'rgba(125,0,0,0.5)';
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ctx.beginPath();
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ctx.lineWidth = 6;
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ctx.lineTo(50, 102);
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ctx.lineTo(250, 102);
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ctx.stroke();
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// squished vertically
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ctx.globalAlpha = 0.7
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ctx.imageSmoothingQuality = 'medium';
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ctx.drawImage(img, 150, 150, 150, 100);
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ctx.rotate(-.2);
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ctx.imageSmoothingEnabled = false;
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ctx.drawImage(img, 100, 150, 400, 350, 10, 200, 150, 100);
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console.log('<img src="' + canvas.toDataURL() + '" />');
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fancyAPI(CanvasKit);
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});
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function fancyAPI(CanvasKit) {
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let surface = CanvasKit.MakeSurface(300, 300);
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const canvas = surface.getCanvas();
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const paint = new CanvasKit.Paint();
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const fontMgr = CanvasKit.FontMgr.RefDefault();
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let robotoData = fs.readFileSync(path.join(__dirname, './Roboto-Regular.woff'));
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const roboto = fontMgr.MakeTypefaceFromData(robotoData);
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const textPaint = new CanvasKit.Paint();
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textPaint.setColor(CanvasKit.Color(40, 0, 0));
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textPaint.setAntiAlias(true);
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const textFont = new CanvasKit.Font(roboto, 30);
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const skpath = starPath(CanvasKit);
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const dpe = CanvasKit.PathEffect.MakeDash([15, 5, 5, 10], 1);
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paint.setPathEffect(dpe);
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paint.setStyle(CanvasKit.PaintStyle.Stroke);
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paint.setStrokeWidth(5.0);
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paint.setAntiAlias(true);
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paint.setColor(CanvasKit.Color(66, 129, 164, 1.0));
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canvas.clear(CanvasKit.Color(255, 255, 255, 1.0));
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canvas.drawPath(skpath, paint);
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canvas.drawText('Try Clicking!', 10, 280, textPaint, textFont);
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surface.flush();
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const img = surface.makeImageSnapshot();
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if (!img) {
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console.error('no snapshot');
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return;
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}
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const pngBytes = img.encodeToBytes();
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if (!pngBytes) {
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console.error('encoding failure');
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return
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}
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// See https://stackoverflow.com/a/12713326
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let b64encoded = Buffer.from(pngBytes).toString('base64');
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console.log(`<img src="data:image/png;base64,${b64encoded}" />`);
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// These delete calls free up memeory in the C++ WASM memory block.
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dpe.delete();
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skpath.delete();
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textPaint.delete();
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paint.delete();
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roboto.delete();
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textFont.delete();
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surface.dispose();
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}
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function starPath(CanvasKit, X=128, Y=128, R=116) {
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let p = new CanvasKit.Path();
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p.moveTo(X + R, Y);
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for (let i = 1; i < 8; i++) {
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let a = 2.6927937 * i;
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p.lineTo(X + R * Math.cos(a), Y + R * Math.sin(a));
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}
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return p;
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}
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