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161 lines
4.3 KiB
HTML
161 lines
4.3 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>Canvas Text Examples</title>
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</head>
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<body>
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<h1>Canvas Text Examples</h1>
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<p><i>The red boxes are the measured text rects</i></p>
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<em>Canvas font size</em><br>
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<canvas id="canvas0" width="600" height="400" style="border: 1px solid black;"></canvas><br><br>
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<script>
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(function () {
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const canvas = document.getElementById('canvas0');
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const ctx = canvas.getContext('2d');
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ctx.textBaseline = 'top';
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ctx.textAlign = 'left';
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ctx.strokeStyle = '#f00';
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let y = 8;
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for (let fontSize = 8; fontSize <= 64; fontSize += 8) {
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ctx.font = `${fontSize}px sans-serif`;
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const text = `Font size: ${fontSize}px`;
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ctx.fillText(text, 8, y);
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ctx.strokeRect(8, y, ctx.measureText(text).width, fontSize);
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y += fontSize + 8;
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}
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})();
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</script>
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<em>Canvas font family</em><br>
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<canvas id="canvas1" width="600" height="250" style="border: 1px solid black;"></canvas><br><br>
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<script>
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(function () {
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const canvas = document.getElementById('canvas1');
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const ctx = canvas.getContext('2d');
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ctx.textBaseline = 'top';
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ctx.textAlign = 'left';
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ctx.strokeStyle = '#f00';
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const families = ['monospace', 'serif', 'fantasy', 'sans-serif', 'cursive'];
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let y = 8;
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for (const family of families) {
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ctx.font = `32px ${family}`;
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const text = `Font family: ${family}`;
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ctx.fillText(text, 8, y);
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ctx.strokeRect(8, y, ctx.measureText(text).width, 32);
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y += 32 + 8;
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}
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})();
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</script>
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<em>Canvas font weight</em><br>
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<canvas id="canvas2" width="600" height="400" style="border: 1px solid black;"></canvas><br><br>
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<script>
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(function () {
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const canvas = document.getElementById('canvas2');
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const ctx = canvas.getContext('2d');
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ctx.textBaseline = 'top';
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ctx.textAlign = 'left';
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ctx.strokeStyle = '#f00';
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let y = 8;
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for (let fontWeight = 100; fontWeight <= 900; fontWeight += 100) {
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ctx.font = `${fontWeight} 32px sans-serif`;
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const text = `Font weight: ${fontWeight}`;
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ctx.fillText(text, 8, y);
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ctx.strokeRect(8, y, ctx.measureText(text).width, 32);
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y += 32 + 8;
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}
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})();
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</script>
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<em>Canvas font style</em><br>
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<canvas id="canvas3" width="600" height="150" style="border: 1px solid black;"></canvas><br><br>
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<script>
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(function () {
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const canvas = document.getElementById('canvas3');
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const ctx = canvas.getContext('2d');
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ctx.textBaseline = 'top';
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ctx.textAlign = 'left';
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ctx.strokeStyle = '#f00';
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const styles = ['normal', 'italic', 'oblique'];
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let y = 8;
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for (const style of styles) {
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ctx.font = `${style} 32px sans-serif`;
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const text = `Font style: ${style}`;
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ctx.fillText(text, 8, y);
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ctx.strokeRect(8, y, ctx.measureText(text).width, 32);
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y += 32 + 8;
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}
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})();
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</script>
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<em>Canvas text-align</em><br>
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<canvas id="canvas4" style="border: 1px solid black;"></canvas><br><br>
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<script>
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(function () {
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const canvas = document.getElementById('canvas4');
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const ctx = canvas.getContext('2d');
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ctx.strokeStyle = 'red';
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ctx.beginPath();
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ctx.moveTo(canvas.width / 2, 0);
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ctx.lineTo(canvas.width / 2, canvas.height);
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ctx.stroke();
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ctx.font = '16px sans-serif';
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ctx.textBaseline = 'top';
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const alignments = ['left', 'center', 'right', 'start', 'end'];
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let y = 8;
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for (const alignment of alignments) {
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ctx.textAlign = alignment;
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ctx.fillText(`Text align: ${alignment}`, canvas.width / 2, y);
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y += 16 + 8;
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}
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})();
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</script>
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<em>Canvas text-baseline</em><br>
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<canvas id="canvas5" width="1000" style="border: 1px solid black;"></canvas><br><br>
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<script>
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(function () {
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const canvas = document.getElementById('canvas5');
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const ctx = canvas.getContext('2d');
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ctx.strokeStyle = 'red';
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ctx.beginPath();
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ctx.moveTo(0, canvas.height / 2);
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ctx.lineTo(canvas.width, canvas.height / 2);
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ctx.stroke();
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ctx.font = '12px sans-serif';
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ctx.textAlign = 'left';
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const baselines = ['top', 'hanging', 'middle', 'alphabetic', 'ideographic', 'bottom'];
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let x = 8;
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for (const baseline of baselines) {
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ctx.textBaseline = baseline;
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ctx.fillText(`Baseline: ${baseline}`, x, canvas.height / 2);
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x += canvas.width / baselines.length;
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}
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})();
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</script>
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</body>
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</html>
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