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fire_new_year.js
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fire_new_year.js
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const firePixelsArray = []
const fireWidth = 40;
const fireHeight = 40;
const fireColorsPalette = [{"r":7,"g":7,"b":7},{"r":31,"g":7,"b":7},{"r":47,"g":15,"b":7},{"r":71,"g":15,"b":7},{"r":87,"g":23,"b":7},{"r":103,"g":31,"b":7},{"r":119,"g":31,"b":7},{"r":143,"g":39,"b":7},{"r":159,"g":47,"b":7},{"r":175,"g":63,"b":7},{"r":191,"g":71,"b":7},{"r":199,"g":71,"b":7},{"r":223,"g":79,"b":7},{"r":223,"g":87,"b":7},{"r":223,"g":87,"b":7},{"r":215,"g":95,"b":7},{"r":215,"g":95,"b":7},{"r":215,"g":103,"b":15},{"r":207,"g":111,"b":15},{"r":207,"g":119,"b":15},{"r":207,"g":127,"b":15},{"r":207,"g":135,"b":23},{"r":199,"g":135,"b":23},{"r":199,"g":143,"b":23},{"r":199,"g":151,"b":31},{"r":191,"g":159,"b":31},{"r":191,"g":159,"b":31},{"r":191,"g":167,"b":39},{"r":191,"g":167,"b":39},{"r":191,"g":175,"b":47},{"r":183,"g":175,"b":47},{"r":183,"g":183,"b":47},{"r":183,"g":183,"b":55},{"r":207,"g":207,"b":111},{"r":223,"g":223,"b":159},{"r":239,"g":239,"b":199},{"r":255,"g":255,"b":255}]
var fireToRight = false;
var fireToLeft = false;
var withoutFire = true;
function setFireToRight(){
fireToRight = true;
fireToLeft = false;
withoutFire = false;
}
function setFireToLeft(){
fireToLeft = true;
withoutFire = false;
fireToRight = false;
}
function setWithoutFire(){
withoutFire = true;
fireToLeft = false;
fireToRight = false;
}
function init() {
createDataStructure();
createFireSource();
renderAnimation();
setInterval(calculateFirePropagation, 50);
}
function createDataStructure(){
const numberPixels = fireWidth * fireHeight;
for(let i = 0; i < numberPixels; i ++) {
firePixelsArray[i] = 0;
}
}
function calculateFirePropagation(){
//It takes index of each pixel column by column and not row by row
for(let column = 0; column < fireWidth; column ++){
for(let row = 0; row < fireHeight; row ++){
var pixelIndex = column + ( fireWidth * row );
updateFireIntensityPerPixel(pixelIndex);
}
}
renderAnimation();
}
function updateFireIntensityPerPixel(currentPixelIndex){
//It calculate intensity of pixel below of currentPixelIndex
var belowPixelIndex = currentPixelIndex + fireWidth;
if(belowPixelIndex >= (fireWidth * fireHeight ) ){
return
}
const decay = Math.floor(Math.random() * 3);
var belowPixelFireIntensity = firePixelsArray[belowPixelIndex];
//Block negative values
var newFireIntensity =
( belowPixelFireIntensity - decay ) >= 0 ? belowPixelFireIntensity - decay : 0;
if(fireToRight === true){
firePixelsArray[currentPixelIndex + decay] = newFireIntensity;
} else if(fireToLeft === true){
firePixelsArray[currentPixelIndex - decay] = newFireIntensity;
} else if(withoutFire === true) {
firePixelsArray[currentPixelIndex] = newFireIntensity;
}
}
function renderAnimation(){
const debug = false;
let html = '<table cellspacing=0 cellpadding=0>'
for(let row = 0; row < fireHeight; row ++){
html += '<tr>';
for(let column = 0; column < fireWidth; column ++){
var pixelIndex = column + (fireWidth * row);
var fireIntensity = firePixelsArray[pixelIndex]
if(debug === true){
html += '<td>';
html += `<div class="pixel-index">${pixelIndex}</div>`;
html += fireIntensity;
html +='</td>';
} else {
var color = fireColorsPalette[fireIntensity];
var colorString = `${color.r}, ${color.g}, ${color.b}`;
html += `<td class="pixel" style="background-color: rgb(${colorString})">`;
html += '</td>';
}
}
html += '</tr>';
}
html += '</table>';
html +='<button onclick="setWithoutFire()">Sem vento</button>';
html +='<button onclick="setFireToRight()">Vento para a direita</button>';
html +='<button onclick="setFireToLeft()">Vento para a esquerda</button>';
document.querySelector('#fire-new-year').innerHTML = html;
}
function createFireSource(){
//It begins filling the intensity of fire in the end of table
for(let column = 0; column <= fireWidth; column ++){
const overflowPixelIndex = fireWidth * fireHeight;
const pixelIndex = (overflowPixelIndex - fireWidth) + column;
firePixelsArray[pixelIndex] = 36;
}
/* Is possible to simplify pixelIndex equation, like this: pixelIndex =
fireWidth * (1 - (fireHeight) + column) */
}
init()