Download Canvas Pocket Reference: Scripted Graphics for HTML5 by David Flanagan PDF

By David Flanagan

The Canvas point is a progressive function of HTML5 that allows strong portraits for wealthy web purposes, and this pocket reference offers the necessities you must placed this aspect to paintings. when you've got operating wisdom of JavaScript, this publication can assist you create certain, interactive, and lively pics -- from charts to animations to games -- even if you are a net fashion designer or a programmer attracted to graphics.

Canvas Pocket Reference offers either an educational that covers the entire element's beneficial properties with lots of examples and a definitive connection with all the Canvas-related periods, equipment, and properties.

You'll find out how to:

  • Draw strains, polygons, and curves
  • Apply colours, gradients, styles, and transparency
  • Use modifications to easily rotate and resize drawings
  • Work with textual content in a image environment
  • Apply shadows to create a feeling of depth
  • Incorporate bitmapped pictures into vector graphics
  • Perform photo processing operations in JavaScript

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Extra resources for Canvas Pocket Reference: Scripted Graphics for HTML5

Example text

Example 1-6 shows the code used to produce Figure 1-11 and demonstrates each of these four shadow properties. fillText("Hello World", 115, 225); // Draw some text // Define a less subtle shadow. Larger offset makes items // "float" higher. Note how the shadow overlaps the box. fillRect(50,25,200,65); // that floats above the blue box The shadowOffsetX and shadowOffsetY properties are always measured in the default coordinate space, and are not affected by the rotate() or scale() methods. Suppose, for example, that you rotate the coordinate system by 90 degrees to draw some vertical text and then restore the old coordinate system to draw horizontal text.

For special effects at large text sizes, you can use strokeText() to draw the outline of the individual text glyphs (an example of outlined text appears in Figure 1-10). Both methods take the text to be drawn as their first argument and take the X and Y coordinates of the text as the second and third arguments. Neither method affects the current path or the current point. As you can see in Figure 1-4, text is affected by the current transformation. The font property specifies the font to be used for text drawing.

Suppose, for example, that you rotate the coordinate system by 90 degrees to draw some vertical text and then restore the old coordinate system to draw horizontal text. Both the vertical and horizontal text will have shadows oriented in the same direction, which is what you probably want. ”[2] [2] At the time of this writing, Google’s Chrome browser gets this wrong, and transforms the shadow offsets. ) the Canvas API also supports bitmap images. The drawImage() method copies the pixels of a source image (or of a rectangle within the source image) onto the canvas, scaling and rotating the pixels of the image as necessary.

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