WLED/wled00/data/pixart/boxdraw.js

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2.0 KiB
JavaScript

function drawBoxes(inputPixelArray, widthPixels, heightPixels) {
var w = window;
// Get the canvas context
var ctx = canvas.getContext('2d', { willReadFrequently: true });
// Set the width and height of the canvas
if (w.innerHeight < w.innerWidth) {
canvas.width = Math.floor(w.innerHeight * 0.98);
}
else{
canvas.width = Math.floor(w.innerWidth * 0.98);
}
//canvas.height = w.innerWidth;
let pixelSize = Math.floor(canvas.width/widthPixels);
let xOffset = (w.innerWidth - (widthPixels * pixelSize))/2
//Set the canvas height to fit the right number of pixelrows
canvas.height = (pixelSize * heightPixels) + 10
//Iterate through the matrix
for (let y = 0; y < heightPixels; y++) {
for (let x = 0; x < widthPixels; x++) {
// Calculate the index of the current pixel
let i = (y*widthPixels) + x;
//Gets the RGB of the current pixel
let pixel = inputPixelArray[i];
let pixelColor = 'rgb(' + pixel[0] + ', ' + pixel[1] + ', ' + pixel[2] + ')';
let textColor = 'rgb(128,128,128)';
// Set the fill style to the pixel color
ctx.fillStyle = pixelColor;
//Draw the rectangle
ctx.fillRect(x * pixelSize, y * pixelSize, pixelSize, pixelSize);
// Draw a border on the box
ctx.strokeStyle = '#888888';
ctx.lineWidth = 1;
ctx.strokeRect(x * pixelSize, y * pixelSize, pixelSize, pixelSize);
//Write text to box
ctx.font = "10px Arial";
ctx.fillStyle = textColor;
ctx.textAlign = "center";
ctx.textBaseline = 'middle';
ctx.fillText((pixel[4] + 1), (x * pixelSize) + (pixelSize /2), (y * pixelSize) + (pixelSize /2));
}
}
var imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
ctx.clearRect(0, 0, canvas.width, canvas.height);
canvas.width = w.innerWidth;
ctx.putImageData(imageData, xOffset, 0);
}