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wildfire.js
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wildfire.js
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const firePixelsArray = [];
const fireWidth = 40;
const fireHeight = 40;
const fireColorsPalette = [
{ r: 7, g: 7, b: 7 },
{ r: 1, g: 30, b: 8 },
{ r: 1, g: 35, b: 10 },
{ r: 2, g: 38, b: 10 },
{ r: 2, g: 75, b: 28 },
{ r: 2, g: 80, b: 30 },
{ r: 2, g: 85, b: 35 },
{ r: 3, g: 90, b: 45 },
{ r: 3, g: 100, b: 50 },
{ r: 3, g: 125, b: 60 },
{ r: 3, g: 140, b: 62 },
{ r: 3, g: 140, b: 65 },
{ r: 3, g: 145, b: 68 },
{ r: 4, g: 145, b: 70 },
{ r: 4, g: 150, b: 75 },
{ r: 3, g: 160, b: 82 },
{ r: 4, g: 164, b: 85 },
{ r: 4, g: 165, b: 88 },
{ r: 4, g: 169, b: 88 },
{ r: 5, g: 170, b: 89 },
{ r: 5, g: 170, b: 90 },
{ r: 6, g: 170, b: 99 },
{ r: 6, g: 175, b: 100 },
{ r: 6, g: 188, b: 100 },
{ r: 6, g: 191, b: 104 },
{ r: 8, g: 178, b: 120 },
{ r: 10, g: 187, b: 120 },
{ r: 10, g: 187, b: 120 },
{ r: 10, g: 191, b: 120 },
{ r: 120, g: 175, b: 165 },
{ r: 149, g: 196, b: 165 },
{ r: 149, g: 200, b: 165 },
{ r: 149, g: 210, b: 165 },
{ r: 149, g: 215, b: 170 },
{ r: 155, g: 223, b: 188 },
{ r: 160, g: 239, b: 198 },
{ r: 167, g: 242, b: 200 }
];
function start() {
createFireDataStructrue();
createFireSource();
renderFire();
setInterval(calculateFirePropagation, 50);
}
function createFireDataStructrue() {
const numberOfPixels = fireWidth * fireHeight;
for (let i = 0; i < numberOfPixels; i++) {
firePixelsArray[i] = 0;
}
}
function calculateFirePropagation() {
for (let column = 0; column < fireWidth; column++) {
for (let row = 0; row < fireHeight; row++) {
const pixelIndex = column + fireWidth * row;
updateFireIntensityPerPixel(pixelIndex);
}
}
renderFire();
}
function updateFireIntensityPerPixel(currentPixelIndex) {
const belowPixelIndex = currentPixelIndex + fireWidth;
if (belowPixelIndex >= fireWidth * fireHeight) {
return;
}
const decay = Math.floor(Math.random() * 3);
const belowPixelFireIntensity = firePixelsArray[belowPixelIndex];
const newFireIntensity =
belowPixelFireIntensity - decay >= 0 ? belowPixelFireIntensity - decay : 0;
firePixelsArray[currentPixelIndex - decay] = newFireIntensity;
}
function renderFire() {
debug = false;
let html = "<table cellpadding=0 cellspacing=0>";
for (let row = 0; row < fireHeight; row++) {
html += "<tr>";
for (let column = 0; column < fireWidth; column++) {
const pixelIndex = column + fireWidth * row;
const fireIntensity = firePixelsArray[pixelIndex];
if (debug == true) {
html += "<td>";
html += "<div class='pixel-index'>" + pixelIndex + "</div>";
html += fireIntensity;
html += "</td>";
} else {
const color = fireColorsPalette[fireIntensity];
const colorString = color.r + "," + color.g + "," + color.b;
html +=
'<td class="pixel" style="background-color: rgb(' +
colorString +
')">';
html += "</td>";
}
}
html += "</tr>";
}
html += "</table>";
document.querySelector("#fireCanvas").innerHTML = html;
}
function createFireSource() {
for (let column = 0; column < fireWidth; column++) {
const overflowPixelIndex = fireWidth * fireHeight;
const pixelIndex = overflowPixelIndex - fireWidth + column;
firePixelsArray[pixelIndex] = 36;
}
}
start();