Is there a way to utilize JavaScript to extract sections of an image and save them in an array, then showcase them randomly on an HTML5 canvas?
Is there a way to utilize JavaScript to extract sections of an image and save them in an array, then showcase them randomly on an HTML5 canvas?
To achieve a clipped image effect, you can utilize the clip parameters within the drawImage() function and render the clipped image onto a dynamically generated canvas.
Here is an illustrative example:
function generateClippedCanvas(image, x, y, width, height) {
var canvas = document.createElement('canvas'),
ctx = canvas.getContext('2d');
canvas.width = width;
canvas.height = height;
// Specify source region coordinates followed by destination region coordinates
ctx.drawImage(image, x, y, width, height, 0, 0, width, height);
return canvas;
}
This function will provide you with a canvas element containing the clipped image already rendered on it. Subsequently, you can directly apply this canvas to draw on another canvas.
For implementation, consider the following main code snippet:
var canvas = document.getElementById('myScreenCanvas'),
ctx = canvas.getContext('2d'),
image = document.getElementById('myImageId'),
clip = generateClippedCanvas(image, 50, 20, 100, 100);
// Render the clipped image on the primary canvas
ctx.drawImage(clip, canvas.width * Math.random(), canvas.height * Math.random());
Alternatively, you could opt for the CSS sprite method, which is not only quicker but also simpler.
If you have an image (let's say my_Image.gif) and want to extract a specific portion using this technique, you can achieve it by setting the extract as a background of a DIV element. Check out the code snippet below.
portion1 in the parameters below instructs to "Extract a 100px high and 100px wide slice from my image, starting at the position 0px from the left (margin-left) and 0px from the top (margin-top)"
portion2 in the parameters below instructs to "Extract a 100px high and 100px wide slice from my image, starting at the position -91px from the left (margin-left) and 0px from the top (margin-top)"
By manipulating the pixels, you can extract portions of any size from any position. You can even use percentages as well.
Note: The image must be in gif format and located in the root directory of your server in this case...
You can also use other image formats like jpeg, png, etc.
<!DOCTYPE html>
<html>
<head>
<style>
#portion1 {
width: 100px;
height: 100px;
background: url(my_Image.gif) 0 0;
}
#portion2 {
width: 100px;
height: 100px;
background: url(my_Image.gif) -91px 0;
}
</style>
</head>
<body>
<div id="portion1"></div><br>
<div id="portion2"></div>
<script>
//creating the array to hold the portions
var ImagePortions = [
"url('my_Image.gif') 0 0 ",
"url('my_Image.gif') -91px 0"];
/*You can now create your canvas container that will act as the parent of these array elements and use Math.random() to display the portions*/
</script>
</body>
</html>
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