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pistacchio February 2016

JavaScript canvas: write within box

In a JS canvas, how can I place a text within a "box", Ora have it stay in a rectangle? I mean, I can place a text at x, y coordinate, but I'd like it to lay in a surround box x0, y0, x1, y1, so to have line breaks when the text is about to go out of the box, I can center it within the rectangle and possibly have the text scaled to fit as much as the box as possible.

Is there such a library to do so?


abhay vyas February 2016

hope this will help you

      body {
        margin: 0px;
        padding: 0px;
    <canvas id="myCanvas" width="578" height="200"></canvas>
      function wrapText(context, text, x, y, maxWidth, lineHeight) {
        var words = text.split(' ');
        var line = '';

        for(var n = 0; n < words.length; n++) {
          var testLine = line + words[n] + ' ';
          var metrics = context.measureText(testLine);
          var testWidth = metrics.width;
          if (testWidth > maxWidth && n > 0) {
            context.fillText(line, x, y);
            line = words[n] + ' ';
            y += lineHeight;
          else {
            line = testLine;
        context.fillText(line, x, y);

      var canvas = document.getElementById('myCanvas');
      var context = canvas.getContext('2d');
      var maxWidth = 400;
      var lineHeight = 25;
      var x = (canvas.width - maxWidth) / 2;
      var y = 60;
      var text = 'All the world \'s a stage, and all the men and women merely players. They have their exits and their entrances; And one man in his time plays many parts.';

      context.font = '16pt Calibri';
      context.fillStyle = '#333';

      wrapText(context, text, x, y, maxWidth, lineHeight);

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Asked in February 2016
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