How to set Canvas Shadow and Transparency in HTML5

This article mainly introduces how to set Canvas shadow and transparency in HTML5 related knowledge, the content is detailed and easy to understand, the operation is simple and fast, has a certain reference value, I believe you will have something to gain after reading this HTML5 article on how to set Canvas shadow and transparency, let's take a look.

Shadow effects mainly have the following attributes.

 shadowOffsetX = float

 shadowOffsetY = float

 shadowBlur = float

 shadowColor = color

ShadowBlur is a blur program used to set shadows. The default value is 0. ShadowColor is used to set the shadow color, which defaults to fully transparent black.

Let's learn about the production of shadow effects through an example. The sample code is as follows:

Ctx.shadowOffsetX = 10

Ctx.shadowOffsetY = 10

Ctx.shadowBlur = 5

Ctx.shadowColor = "rgba (0,0,0,0.9)"; / / Shadow color, transparency is 0.9

Ctx.font = "40px Times New Roman"

Ctx.fillStyle = "# FF0000"

Ctx.fillText ("HTML5 Research Group", 25130)

Ctx.fillStyle = "rgba"; / / set a RGBA fill color with a transparency of 0.3

Ctx.fillRect (0Pol 0300300); / / fill a rectangular area of 300mm 300

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