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ctx-get-transform-bugfix

v1.0.3

Published

monkey patch CanvasRenderingContext2D to include a getTransform method

Downloads

4

Readme

ctx.getTransform()

cxt.getTransform() is one of the missing bits of functionality in CanvasRenderingContext2D. This module will monkey patch a ctx to track the current transformation stack and allows retrieval of the current matrix.

install

npm install ctx-get-transform

use



var canvas = document.createElement('canvas');
var ctx = canvas.getContext('2d');

require('ctx-get-transform')(ctx);

console.log(ctx.getTransform) // outputs: function tGetTransform() ...

ctx.getTransform() // returns a gl-matrix style mat3

api surface

there is only a single method added to the passed ctx, but every method that manipulates the transformation matrix is wrapped.

The awesome method (and purpose of this library):

ctx.getTransform - return a gl-matrix style mat3 (just a 9 element Array)

note: the returned array is not a copy of the tracked matrix. Changing it can result in weird issues! Utilize mat3.clone(ctx.getTransform()) if you need a copy.

license

MIT (see LICENSE.txt)