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This feature introduces new
setPlatformAPI
method to provide the ability to extend platform-dependent methods.When we using SSR mode in #836. There is still an issue that hasn't been solved. If we use a customized font, which glyph is very different from the default font. There is no built-in method for NodeJS or echarts to get text width accurately. In this case, we still need to rely on the third-party library like
node-canvas
to measure text. The original methodzrender.util.$override('createCanvas', () => ...)
looks very internal.So in this PR we abstract a new concept
platform
that can provide these platform-dependent methods. Currently there are three methods.createCanvas
Same with the original
zrender.util.createCanvas
. With this, you can usenode-canvas
or some other canvas like API in NodeJS.measureText.
If you have a more lightweight text measurement implementation. You can only extend this method. It's not required if you have registered
createCanvas
and canvas implementation already havemeasureText
method.loadImage
If you are using
node-canvas
or some other canvas like API and wan't draw images. This will be required.Or in SSR mode. Only image width/height is needed. We can provide a more lightweight method.