Adjust the dimensions of the canvas without disrupting the existing artwork

Question

Adjust the dimensions of the canvas without disrupting the existing artwork

I am currently working on a pixel art application where I am facing an issue with saving images from the canvas. The saved image appears small and pixelated when I try to resize it.

I would like to resize the image to larger dimensions, but I am unsure of how to achieve this.

Below is an example code snippet:

var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");

ctx.beginPath();
ctx.rect(0, 0, 50, 50);
ctx.fillStyle = 'red'; 
ctx.fill();

document.write('<img style="width:300px;" src="'+c.toDataURL("image/png")+'"/>');

// The current image has dimensions of 108x108px and does not look good when resized to 300x300px
// I wish to download the canvas image with higher resolution

<canvas id="myCanvas" width="108" height="108" style="width: 300px; height:300px;">

</canvas>

javascript html css canvas

Answer 1

Answer №1

One way to achieve this is by creating a canvas element and placing the imageData in it.

var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");

ctx.beginPath();
ctx.rect(0, 0, 25, 25);
ctx.fillStyle = 'red';
ctx.fill();
ctx.beginPath();
ctx.rect(0, 25, 25, 25);
ctx.fillStyle = 'yellow';
ctx.fill();
ctx.beginPath();
ctx.rect(25, 0, 25, 25);
ctx.fillStyle = 'blue';
ctx.fill();
ctx.beginPath();
ctx.rect(25, 25, 25, 25);
ctx.fillStyle = 'green';
ctx.fill();

var c2 = document.createElement("canvas");
c2.width = 50;
c2.height = 50;
var ctx2 = c2.getContext("2d");
var imageData = ctx.getImageData(0, 0, 50, 50);
ctx2.putImageData(imageData, 0, 0);

document.write('<img style="width:300px;" src="' + c2.toDataURL("image/png") + '"/>');

Answer 2

One way to achieve this is by creating a canvas element and placing the imageData in it.

var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");

ctx.beginPath();
ctx.rect(0, 0, 25, 25);
ctx.fillStyle = 'red';
ctx.fill();
ctx.beginPath();
ctx.rect(0, 25, 25, 25);
ctx.fillStyle = 'yellow';
ctx.fill();
ctx.beginPath();
ctx.rect(25, 0, 25, 25);
ctx.fillStyle = 'blue';
ctx.fill();
ctx.beginPath();
ctx.rect(25, 25, 25, 25);
ctx.fillStyle = 'green';
ctx.fill();

var c2 = document.createElement("canvas");
c2.width = 50;
c2.height = 50;
var ctx2 = c2.getContext("2d");
var imageData = ctx.getImageData(0, 0, 50, 50);
ctx2.putImageData(imageData, 0, 0);

document.write('<img style="width:300px;" src="' + c2.toDataURL("image/png") + '"/>');

Adjust the dimensions of the canvas without disrupting the existing artwork

Answer №1

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