在一个画布的角落内复制和粘贴一个画布

Question

I have two canvases on my HTML page and what i actually want to do is pasting all stuff inside first canvas in bottom right corner of second canvas. This is the code I was trying:

<canvas id="first"></canvas>
<canvas id="second"></canvas>
<script>
var first = document.getElementById('first').getContext('2d');
var sec = document.getElementById('second').getContext('2d');

//--code for drawing in first canvas--

var img = new Image();
img.src="imgName.jpg";
img.onload = function() {
    sec.drawImage(img,0,0,sec.canvas.width,sec.canvas.height);

//Actually i want first canvas to overlap image on second canvas

    var paste = new Image();
    paste.src = first.canvas;
    paste.onload = function() {

        sec.drawImage(paste,100,100,400,600);

    };
};
</script>

Problem is: second canvas shows image but doesn't shows first canvas in its bottom right corner.

Please worthy guys, i need the answer. Its very Important. Thanks in advnce to all helpers..

Answer 1

The way you are drawing the first canvas on the second one is not correct. You can directly draw a canvas on another canvas using drawImage() method.

 var first = document.getElementById('first').getContext('2d'); var sec = document.getElementById('second').getContext('2d'); // draw on first canvas first.fillStyle = '#07C'; first.fillRect(0, 0, first.canvas.width, first.canvas.height); // draw image on second canvas var img = new Image(); img.src = "http://lorempixel.com/300/300"; img.onload = function() { sec.drawImage(img, 0, 0, sec.canvas.width, sec.canvas.height); sec.drawImage(first.canvas, 100, 100, 100, 100); // draw first canvas on a portion of second canvas }; 

 body {display: flex} 

 <canvas id="first" width="200" height="200"></canvas> <canvas id="second" width="200" height="200"></canvas>