The transform() function
The transform() function can be used to scale, skew and translate the canvas
- Arguments to the function
- An example of scaling your canvas up
- An example of skewing your canvas
- An example of translating your canvas
An example of using the
transform()
function to skew the canvas

The transform()
function can be used to apply matrix transformations to the canvas.
What does that mean in practice? It's a
combination of scaling, skewing and translating. Of these, scaling can also be
done with the scale()
function, translating
can be done with the translate()
function but skewing
(which is slanting the
canvas at an angle) can only be done with the
transform()()
and setTransform()()
functions. See the
examples for how to use this function.
Arguments to the function
- The scale factor(X direction)
- The skew factor (X-axis)
- The skew factor (Y-axis)
- The scale factor(Y direction)
- The translation (X direction)
- The translation (Y direction)
An example of scaling your canvas up
This example uses the transform function (instead of the scale()
function) to increase the size of the canvas.
<script>
window.onload = function ()
{
var canvas = document.getElementById("cvs");
var context = canvas.getContext('2d');
context.transform(2,0,0,2,0,0);
var bar = new RGraph.Bar({
id: 'cvs',
data: [1,8,6,3,5]
}).draw();
}
</script>
An example of skewing your canvas
This example uses the transform()
function to skew the canvas.
<script>
window.onload = function ()
{
var canvas = document.getElementById("cvs");
var context = canvas.getContext('2d');
context.transform(1,0.2,0.2,1,0,0);
var bar = new RGraph.Bar({
id: 'cvs',
data: [1,8,6,3,5]
}).draw();
}
</script>
An example of translating your canvas
This example uses the transform()
function (instead of the translate()
function)
to move the coordinate system of the canvas
by 50 pixels in the X and Y directions.
<script>
window.onload = function ()
{
var canvas = document.getElementById("cvs");
var context = canvas.getContext('2d');
context.transform(1,0,0,1,50,50);
var bar = new RGraph.Bar({
id: 'cvs',
data: [1,8,6,3,5]
}).draw();
}
</script>