Is it possible to transform a 2d array of hexadecimal codes into a PNG image?
The arrays are structured like this (but larger in scale)
[
[
'#FF0000',
'#00FF00'
],
[
'#0000FF',
'#000000'
]
]
This array should produce an image that resembles the following example.
If this method is unable to process arrays of this format, what type of array will it be compatible with?
To display a PNG image on the client-side without using libraries, consider utilizing the HTML5 Canvas.
It is advisable to work with a one-dimensional array for storing the image's dimensions as it simplifies the process.
var pixels = [ ... ], // your extensive array
width = 4, // width in pixels
height = Math.ceil(pixels.length / width),
// Create canvas
canvas = document.createElement('canvas'),
context = canvas.getContext('2d'),
imgData = context.createImageData(width, height);
canvas.height = height;
canvas.width = width;
// fill imgData with colors from array
for(var i = 0; i < pixels.length; i++) {
// Convert pixels[i] to RGB
// See http://stackoverflow.com/questions/5623838/rgb-to-hex-and-hex-to-rgb
imgData[i] = r;
imgData[i + 1] = g;
imgData[i + 2] = b;
imgData[i + 3] = 255; // Alpha channel
}
// put data to context at (0, 0)
context.putImageData(imgData, 0, 0);
// output image
var img = new Image();
img.src = canvas.toDataURL('image/png');
// add image to body (or whatever you want to do)
document.body.appendChild(img);
If utilizing a newer feature like this seems challenging or too laborious, you can always refer to Tom's answer instead :)
If you're looking to generate client-side PNG files using JavaScript, then PNGlib is a helpful resource. You can follow a similar approach as shown in their example:
var p = new PNGlib(200, 200, 256);
for (var x = 0; x < 2; x++)
for (var y = 0; y < 2; y++)
p.buffer[p.index(x, y)] = p.color(/* your colour */);
document.write('<img src="data:image/png;base64,' + p.getBase64() + '">');
Without more specific information from you, it's challenging to provide a tailored example. However, based on the details shared, I believe this might be what you're seeking. Remember to adjust the x and y limits for different arrays accordingly.
To display the array of RGB values, you can utilize an HTML5 canvas element and then extract the contents from the canvas by using the .toDataURL() method provided by the canvas:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Sample</title>
</head>
<body>
<script>
"use strict";
// Define the image data for drawing:
var imageData = [
["#FF0000", "#00FF00"],
["#FFFF00", "#0000FF"]
];
// Create a canvas with dimensions matching the image data:
var canvas = document.createElement("canvas");
canvas.height = imageData.length;
canvas.width = imageData[0].length;
document.body.appendChild(canvas);
// Draw the image data onto the canvas:
var context = canvas.getContext("2d");
for (var row = 0; row < imageData.length; ++row) {
for (var col = 0; col < imageData[row].length; ++col) {
context.fillStyle = imageData[row][col];
context.fillRect(col, row, 1, 1);
}
}
// Retrieve the image data using .toDataURL() method:
console.log(canvas.toDataURL("image/png"));
</script>
</body>
</html>
Here is a solution for creating an image using a 2-dimensional array with RGB colors. This was provided as an answer to another question.
var img=[[[0,0,0],[0,0,0],[0,0,0],[255,0,0],[0,0,0]],
[[0,0,0],[0,0,255],[0,0,0],[0,0,0],[255,0,0]],
[[0,0,0],[0,0,0],[0,0,0],[0,0,0],[255,0,0]],
[[0,0,0],[0,0,255],[0,0,0],[0,0,0],[255,0,0]],
[[0,0,0],[0,0,0],[0,0,0],[255,0,0],[0,0,0]]];
var pixelSize = 20;
var c = document.createElement("canvas");
c.height = img[0].length * pixelSize;
c.width = img.length * pixelSize;
document.body.appendChild(c);
var ctx = c.getContext("2d");
ctx.clearRect(0, 0, c.width, c.height);
for (var i = 0; i < img.length; i++) {
for (var j = 0; j < img[0].length; j++) {
ctx.fillStyle = "rgb("+img[i][j][0]+","+img[i][j][1]+","+img[i][j][2]+")";
ctx.fillRect(i*pixelSize, j*pixelSize, pixelSize, pixelSize);
}
}
console.log(c.toDataURL("image/png"));
var png = document.createElement("img");
png.src = c.toDataURL("image/png");
c.remove();
document.body.appendChild(png);Alternatively, consider utilizing a more recent iteration of pnglib:
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