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- <!DOCTYPE html>
- <html>
- <head>
- <meta charset="utf-8">
- </head>
- <body>
- <script type="text/javascript">
- var testFont = '40px sans-serif';
- function test(x, y, text, style, rotation, baseline) {
- var canvas = document.createElement("canvas");
- canvas.width = 400;
- canvas.height = 400;
- canvas.style.cssText = 'position:absolute;' + style;
- document.getElementsByTagName('body')[0].appendChild(canvas);
- var ctx = canvas.getContext('2d');
- ctx.globalAlpha = 0.5;
- ctx.beginPath();
- ctx.moveTo(x - 20, y); ctx.lineTo(x + 20, y);
- ctx.moveTo(x, y - 20); ctx.lineTo(x, y + 20);
- ctx.stroke();
- ctx.globalAlpha = 1.0;
- ctx.font = testFont;
- if (rotation != 0) {
- ctx.translate(x,y);
- ctx.rotate(rotation);
- ctx.translate(-x,-y);
- }
- if (baseline != '') {
- ctx.textBaseline = baseline;
- }
- ctx.fillText(text, x, y);
- }
- // Testcase: vertical text with various textBaselines
- // test(100, 50, 'Top', 'writing-mode:vertical-lr', 0, 'top');
- // test(150, 50, 'Middle', 'writing-mode:vertical-lr', 0, 'middle');
- // test(200, 50, 'Alphabetic', 'writing-mode:vertical-lr', 0, 'alphabetic');
- // test(250, 50, 'Bottom', 'writing-mode:vertical-lr', 0, 'bottom');
- // Reference: horizontal text with 90° rotation and the same baselines
- test(100, 50, 'Top', 'writing-mode:horizontal-tb', Math.PI/2, 'top');
- test(150, 50, 'Middle', 'writing-mode:horizontal-tb', Math.PI/2, 'middle');
- test(200, 50, 'Alphabetic', 'writing-mode:horizontal-tb', Math.PI/2, 'alphabetic');
- test(250, 50, 'Bottom', 'writing-mode:horizontal-tb', Math.PI/2, 'bottom');
- </script>
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