Canvas Pocket Reference: Scripted Graphics for HTML5 by David Flanagan

By David Flanagan

The Canvas aspect is a progressive characteristic of HTML5 that allows robust photos for wealthy net functions, and this pocket reference presents the necessities you must placed this point to paintings. when you have operating wisdom of JavaScript, this e-book can help you create specific, interactive, and lively snap shots -- from charts to animations to games -- even if you are a net clothier or a programmer attracted to graphics.

Canvas Pocket Reference presents either an educational that covers all the element's positive aspects with lots of examples and a definitive connection with all of the Canvas-related sessions, equipment, and properties.

You'll learn the way to:

  • Draw traces, polygons, and curves
  • Apply colours, gradients, styles, and transparency
  • Use ameliorations to easily rotate and resize drawings
  • Work with textual content in a photograph environment
  • Apply shadows to create a feeling of depth
  • Incorporate bitmapped photographs 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

In most canvas operations, when you specify the coordinates of a point, it is taken to be a point in the current coordinate system, not in the default coordinate system. The current transformation matrix is used to convert the coordinates you specified to the equivalent coordinates in the default coordinate system. The setTransform() method allows you to set a canvas’s transformation matrix directly, but coordinate system transformations are usually easier to specify as a sequence of translations, rotations and scaling operations.

Normally, you specify the upper-left corner and then pass a positive width and positive height, but you may also specify other corners and pass negative dimensions. fillRect() fills the specified rectangle with the current fillStyle. strokeRect() strokes the outline of the specified rectangle using the current strokeStyle and other line attributes. clearRect( is like fillRect(), but it ignores the current fill style and fills the rectangle with transparent black pixels (the default color of all blank canvases).

0, "rgba(0,0,0,0)"); An important point to understand about gradients is that they are not position-independent. When you create a gradient, you specify bounds for the gradient. If you then attempt to fill an area outside of those bounds you’ll get the solid color defined at one end or the other of the gradient. If you define a gradient along the line between (0,0) and (100,100), for example, you should only use that gradient to fill objects located within the rectangle (0,0,100,100). fillRect(0,0,600,600); // to fill the entire canvas.

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