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Ещё один эффект огня, который движется за вашим курсором на HTML5 canvas
07.11.14, 11:23:07



Достаточно реалистичный огонь. Эффект здоровский

Для начала посмотрите ДЕМО

Моё тестирование в фидле: КЛИК

Установка:

В самый низ вашего css вставляйте:
Код
#game {
  position:fixed;
  top:0px;
  left:0px;
  z-index:-1;
  }


Следующий код после < /head > на нужных страницах:
Код
<canvas id="game"></canvas>  
  <script>  
  var canvas;  
  var stage;  
  var width = 650;  
  var height = 400;  
  var particles = [];  
  var max = 60;  
  var mouseX=0;  
  var mouseY=0;  

  var speed=3;  
  var size=20;  

  //The class we will use to store particles. It includes x and y  
  //coordinates, horizontal and vertical speed, and how long it's  
  //been "alive" for.  
  function Particle(x, y, xs, ys) {  
this.x=x;  
this.y=y;  
this.xs=xs;  
this.ys=ys;  
this.life=0;  
  }  

  function resizeCanvas() {  
setTimeout(function() {  
width = window.innerWidth;  
height = window.innerHeight;  
canvas.width = width;  
canvas.height = height;  
canvas.style.width = width + "px";  
canvas.style.height = height + "px";  
mouseX=canvas.width/2;  
mouseY=canvas.height*0.8;  
stage.globalCompositeOperation="lighter"  
}, 0);  
  }  

  function init() {  

//Reference to the HTML element  
canvas=document.getElementById("game");  

resizeCanvas();  

//See if the browser supports canvas  
if (canvas.getContext) {  

//Get the canvas context to draw onto  
stage = canvas.getContext("2d");  

//Makes the colors add onto each other, producing  
//that nice white in the middle of the fire  
stage.globalCompositeOperation="xor";  

//Update the mouse position  
canvas.addEventListener("mousemove", getMousePos);  

window.addEventListener("resize", function() {  
resizeCanvas();  
stage.globalCompositeOperation="lighter";  
mouseX=canvas.width/2;  
mouseY=canvas.height*0.8;  
});  

//Update the particles every frame  
var timer=setInterval(update,40);  

} else {  
alert("Canvas not supported.");  
}  
  }  

  function getMousePos (evt) {  
var rect = canvas.getBoundingClientRect();  
var root = document.documentElement;  

// return mouse position relative to the canvas  
mouseX = evt.clientX - rect.left - root.scrollLeft;  
mouseY = evt.clientY - rect.top - root.scrollTop;  
  }  

  function update() {  

//Adds ten new particles every frame  
for (var i=0; i<10; i++) {  

//Adds a particle at the mouse position, with random horizontal and vertical speeds  
var p = new Particle(mouseX, mouseY, (Math.random()*2*speed-speed)/2, 0-Math.random()*2*speed);  
particles.push(p);  
}  

//Clear the stage so we can draw the new frame  
stage.clearRect(0, 0, width, height);  

//Cycle through all the particles to draw them  
for (i=0; i<particles.length; i++) {  

//Set the file colour to an RGBA value where it starts off red-orange, but progressively gets more grey and transparent the longer the particle has been alive for  
stage.fillStyle = "rgba("+(260-(particles[i].life*2))+","+((particles[i].life*2)+50)+","+(particles[i].life*2)+","+(((max-particles[i].life)/max)*0.4)+")";  

stage.beginPath();  
//Draw the particle as a circle, which gets slightly smaller the longer it's been alive for  
stage.arc(particles[i].x,particles[i].y,(max-particles[i].life)/max*(size/2)+(size/2),0,2*Math.PI);  
stage.fill();  

//Move the particle based on its horizontal and vertical speeds  
particles[i].x+=particles[i].xs;  
particles[i].y+=particles[i].ys;  

particles[i].life++;  
//If the particle has lived longer than we are allowing, remove it from the array.  
if (particles[i].life >= max) {  
particles.splice(i, 1);  
i--;  
}  
}  
  }  

  init();  
  </script>


Материал подготовлен Apocalypse
Категория: HTML5 | Добавил: Apocalypse | Теги: эффект, Ещё, курсором, вашим, движется, огня, на, Один, который, За
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