HTML5 how to draw a rectangle with color and transparency for shape diagram_html5 tutorial tips

1. Customize brush style

If you want to add color to the shape map, you need to use the following two important attributes.

fillStyle: Set the default color for all fill operations.
strokeStyle: Set the default color for all stroke operations.

2. Draw a rectangle with color and transparency

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The code is as follows:

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3. Drawing effect