Canvas Text

While the canvas is primarily used to draw graphics, there are times we want to use text as well. We have two methods to draw text: fillText(text, x, y) and strokeText(text, x, y). The text parameter is the text to render, and the x and y are the upper left corner of the text.

As with the fillRect() and strokeRect() functions, fillText() and strokeText() fill and stroke the text, respectively, and the text does not affect the current path. The text properties are set by properties on the context:

  • font is the font to use for the text. It uses the same syntax as the CSS font property. I.e. ctx.font = 10pt Arial;
  • textAlign sets the alignment of the text. Possible values are start, end, left, right, or center.
  • textBaseline sets the baseline alignment for the text. Possible values are top, hanging, middle, alphabetic, ideographic, or bottom.
  • direction the directionality of the text. Possible values are ltr (left-to-right), rtl (right-to-left), and inherit (inherit from the page settings).

<canvas id="example" width="500" height="300"></canvas>
  var canvas = document.getElementById('example');
  var ctx = canvas.getContext('2d');
  ctx.font = "40pt symbol";
  ctx.strokeText("Foo", 100, 100);
  ctx.fillText("Bar", 100, 200);

Sometimes you might want to know how large the text will be rendered in the canvas. The measureText(text) function returns a TextMetrics object describing the size of a rectangle that the supplied text would fill, given the current canvas text properties.