HTML canvas setTransform() method
Definition and Usage
Each object on the canvas has a current transformation matrix.
setTransform() method resets the current transformation matrix to the unit matrix and then runs with the same parameters transform().
In other words, setTransform() allows you to scale, rotate, move, and skew the current environment.
Note:This transformation only affects the drawing after the setTransform() method call.
Example
Draw a rectangle, reset and create a new transformation matrix using setTransform(), draw a rectangle again, reset and create a new transformation matrix, and then draw a rectangle again. Please note that the red rectangle will not be displayed in the example below because it is below the blue rectangle: every time you call setTransform(), it resets the previous transformation matrix and then constructs a new matrix.
JavaScript:
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.fillStyle="yellow";
ctx.fillRect(0,0,250,100)
ctx.setTransform(1,0.5,-0.5,1,30,10);
ctx.fillStyle="red";
ctx.fillRect(0,0,250,100);
ctx.setTransform(1,0.5,-0.5,1,30,10);
ctx.fillStyle="blue";
ctx.fillRect(0,0,250,100);
Syntax
context.setTransform(a,b,c,d,e,f);
Parameter Value
| Parameter | Description |
|---|---|
| a | Horizontal rotation drawing. |
| b | Horizontal skewing drawing. |
| c | Vertical skewing drawing. |
| d | Vertical scaling drawing. |
| e | Horizontal movement drawing. |
| f | Vertical movement drawing. |
Browser Support
The numbers in the table indicate the first browser version that fully supports this property.
| Chrome | Edge | Firefox | Safari | Opera |
|---|---|---|---|---|
| Chrome | Edge | Firefox | Safari | Opera |
| 4.0 | 9.0 | 3.6 | 4.0 | 10.1 |
Note:Internet Explorer 8 and earlier versions do not support the <canvas> element.
