transform-2d
A module to keep track of and perform common mutations on a matrix describing a 2d affine transform.
In other words, you can use to do things to images like:
- zooming
- panning
- rotations
- sheering
Usage
var Transform2D = ; var t = ; // [10, 10] -> [5, 5]t; // Zoom in a little centered at [5, 5]t;
API
transform = new Transform2D([options])
options = // defaults zoomLevel: 1 // initial zoom level zoomScale: 01 // scaling factor per zoom step minZoomLevel: 01 // minimum zoom level maxZoomLevel: 10 // maximum zoom level
transform.zoom(steps : number, point : Array<number>)
zoom steps
steps around a point
. Returns this
.
transform.panStart(point : Array<number>)
Initiate panning from a particular point, as if the image were pulled at that location. Returns this
.
transform.pan(point : Array<number>)
Pan to a particular point. Returns this
.
transform.panEnd()
Terminate panning.
transform.getCTM()
Returns the current transformation matrix in the form [a, c, b, d, x, y]
corresponding to the 2d augmented matrix [[a, b, x], [c, d, y]]
.