First, draw a red rectangle, then set transparency (globalAlpha) to 0.5, and then draw a blue and a green rectangle:
JavaScript:
Internet Explorer 9, Firefox, Opera, Chrome, and Safari support the globalAlpha property.
Note: Internet Explorer 8 and earlier versions, do not support the <canvas> element.
The globalAlpha property sets or returns the current alpha or transparency value of the drawing.
The globalAlpha property value must be a number between 0.0 (fully transparent) and 1.0 (no transparancy).
Default value: | 1.0 |
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JavaScript syntax: | context.globalAlpha=number; |
Value | Description | Play it |
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number | The transparency value. Must be a number between 0.0 (fully transparent) and 1.0 (no transparancy) | Play it » |