Current transformation implementation adds a <g> element and set <g>'s transform attribute with string concatenation of rotate, matrix, rotate, scale.
This pull request implements CanvasTransform interface using DOMMatrix and SVG's matrix(a b c d e f) transform function. Compared to adding string concatenation results to transform attribute of <g> element, it is more reliable to use the transformation matrix which DOMMatrix API calculates and applied directly to <path>, <rect> and other elements every time.
For lineTo, bezierCurveTo, quadraticCurveTo, each step’s point x and y were now calculated based on current transformation matrix.
New methods
This pull request also implemented 3 missing methods defined in CanvasTransform interface:
ctx.prototype.setTransform(a, b, c, d, e, f): SetTransform changes the current transformation matrix to the matrix given by the arguments as described below.
ctx.prototype.getTransform(): Returns a copy of the current transformation matrix, as a newly created DOMMAtrix Object.
ctx.prototype.resetTransform(): ResetTransform resets the current transformation matrix to the identity matrix.
Current transformation implementation adds a
<g>
element and set<g>
's transform attribute with string concatenation ofrotate
,matrix
,rotate
,scale
.This pull request implements CanvasTransform interface using
DOMMatrix
and SVG'smatrix(a b c d e f)
transform function. Compared to adding string concatenation results to transform attribute of<g>
element, it is more reliable to use the transformation matrix whichDOMMatrix
API calculates and applied directly to<path>
,<rect>
and other elements every time.Example
Rendered in Canvas:
Rendered with v1.0.19’s implementation:
Rendered with this pull request's implementation:
For
lineTo
,bezierCurveTo
,quadraticCurveTo
, each step’s point x and y were now calculated based on current transformation matrix.New methods
This pull request also implemented 3 missing methods defined in CanvasTransform interface:
ctx.prototype.setTransform(a, b, c, d, e, f)
: SetTransform changes the current transformation matrix to the matrix given by the arguments as described below.ctx.prototype.getTransform()
: Returns a copy of the current transformation matrix, as a newly created DOMMAtrix Object.ctx.prototype.resetTransform()
: ResetTransform resets the current transformation matrix to the identity matrix.Reference