Example Analysis of HTML5 Canvas coordinate Transformation

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During Canvas drawing, the coordinates always start at the beginning of the upper-left corner. However, in actual development, the coordinate systems of multiple elements are often mixed together, and translate () is a very useful way to transform the coordinates of elements.

The sample code is as follows:

Save (); / / Press the current drawing state onto the stack and save it

Ctx.translate (100100); / / start conversion of coordinates

. / / carry out the planned operation

Restore (); / / restore the coordinate system

The above operation is very similar to the work of a printing press. In the real working environment of the printing press, the paper is not moving and the sprinkler is moving, but in the process of Canvas drawing, the "sprinkler" is actually not moving, but the canvas is constantly moving (changing drawing coordinates).

Note that before converting the coordinate origin, do not forget to save the state, of course, do not forget to restore the state after drawing, otherwise it will cause painting layer pollution and unexpected errors.

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