I'm trying to implement skew transformation using the "x" axis with HTML5 canvas, but my code fails... Here is my JavaScript:
function init() {
var canvas = document.getElementById('skewTest'),
context = canvas.getContext('2d'),
angle = Math.PI / 4;
img = document.createElement('img');
img.src = 'img.gif';
img.onload = function () {
context.setTransform(1, Math.tan(angle), 1, 1, 0, 0);
context.clearRect(0, 0, 200, 200);
context.drawImage(img, 0, 0, 100, 100);
}
}
I'll be very glad if I see working example in JsFiddle.
Thank you in advance!
The correct matrix of skewing in only one direction is
context.setTransform(1, Math.tan(angle), 0, 1, 0, 0);
// ^
With the number at ^
being 1, you are skewing the image in the y-direction by 45° as well.