ImageData height Property - Javascript Canvas Reference

Javascript examples for Canvas Reference:ImageData

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Description

The height property returns the height of an ImageData object, in pixels.

JavaScript syntax 

imgData.height;

Example

Log the height of an ImageData object:

Demo Code

ResultView the demo in separate window 

<!DOCTYPE html>
<html>
<body>

<canvas id="myCanvas" width="300" height="250" style="border:1px solid #d3d3d3;">
Your browser does not support the HTML5 canvas tag.</canvas>

<script>

var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
var imgData = ctx.createImageData(100, 100);
console.log("Height of imgData is: " + imgData.height);

var i;/*from   w w w .j av  a2  s  . c  om*/
for (i = 0; i < imgData.data.length; i += 4) {
  imgData.data[i+0] = 255;
  imgData.data[i+1] = 0;
  imgData.data[i+2] = 0;
  imgData.data[i+3] = 255;
}

ctx.putImageData(imgData, 10, 10);

</script>

</body>
</html>

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