I'm attempting to add an image to a canvas element. Consider this code snippet (http://jsfiddle.net/n3L6e1wp/). I am aiming to replace the text shown in the canvas with an img tag. I have attempted to substitute the content of the div with:
<img src='<%= asset_path('layout/image.jpg') %>' id='picture' style='max-height:100%'>However, nothing appears and I'm unsure if it can even be done.
Thank you in advance!
The canvas drawImage method has the capability to accept an HTML img element as its image source, allowing you to directly input it like so:
ctx.drawImage(document.getElementById('picture'),0,0);
Here is some sample code along with a live demonstration:
window.onload=function(){
var canvas=document.getElementById("canvas");
var ctx=canvas.getContext("2d");
ctx.drawImage(document.getElementById('picture'),0,0);
}body{ background-color: ivory; }
#canvas{border:1px solid red; margin:0 auto; }<canvas id="canvas" width=300 height=300></canvas>
<!-- src is for this demo. You can still use your <%...%> -->
<img src='https://dl.dropboxusercontent.com/u/139992952/multple/sun.png' id='picture' style='max-height:100%'>You can use the following code snippet to easily insert an image onto a canvas:
const canvas = document.getElementsByTagName('canvas')[0];
const context = canvas.getContext('2d');
function drawImageOnCanvas() {
const image = new Image();
image.src = 'assets/image.jpg'; // replace with your image path
image.onload = function(){
context.drawImage(image, 100, 100); // adjust x and y coordinates as needed
}
}
drawImageOnCanvas();
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