正如標題所示,我試圖讓這個圈子的閃爍的領域矩形或鑽石,無論哪個更真實。JS新手,有沒有辦法將這些圈子變成鑽石?
鏈接:http://jsfiddle.net/Jksb5/1/
HTML
<canvas id="pixie"></canvas>
JS
var WIDTH;
var HEIGHT;
var canvas;
var con;
var g;
var pxs = new Array();
var rint = 60;
$(document).ready(function(){
WIDTH = 960;
HEIGHT = 300;
canvas = document.getElementById('pixie');
$(canvas).attr('width', WIDTH).attr('height',HEIGHT);
con = canvas.getContext('2d');
for(var i = 0; i < 100; i++) {
pxs[i] = new Circle();
pxs[i].reset();
}
setInterval(draw,rint);
});
function draw() {
con.clearRect(0,0,WIDTH,HEIGHT);
for(var i = 0; i < pxs.length; i++) {
pxs[i].fade();
pxs[i].move();
pxs[i].draw();
}
}
function Circle() {
this.s = {ttl:8000, xmax:5, ymax:2, rmax:25, rt:1, xdef:90, ydef:90, xdrift:4, ydrift: 4, random:true, blink:true};
this.reset = function() {
this.x = (this.s.random ? WIDTH*Math.random() : this.s.xdef);
this.y = (this.s.random ? HEIGHT*Math.random() : this.s.ydef);
this.r = ((this.s.rmax-1)*Math.random()) + 1;
this.dx = (Math.random()*this.s.xmax) * (Math.random() < .5 ? -1 : 1);
this.dy = (Math.random()*this.s.ymax) * (Math.random() < .5 ? -1 : 1);
this.hl = (this.s.ttl/rint)*(this.r/this.s.rmax);
this.rt = Math.random()*this.hl;
this.s.rt = Math.random()+1;
this.stop = Math.random()*.2+.4;
this.s.xdrift *= Math.random() * (Math.random() < .5 ? -1 : 1);
this.s.ydrift *= Math.random() * (Math.random() < .5 ? -1 : 1);
}
this.fade = function() {
this.rt += this.s.rt;
}
this.draw = function() {
if(this.s.blink && (this.rt <= 0 || this.rt >= this.hl)) this.s.rt = this.s.rt*-1;
else if(this.rt >= this.hl) this.reset();
var newo = 1-(this.rt/this.hl);
con.beginPath();
con.arc(this.x,this.y,this.r,0,Math.PI*2,true);
// con.rect(188, 50, 100, 100);
con.closePath();
var cr = this.r*newo;
g = con.createRadialGradient(this.x,this.y,0,this.x,this.y,(cr <= 0 ? 1 : cr));
g.addColorStop(0.0, 'rgba(237,23,31,'+newo+')');
// g.addColorStop(this.stop, 'rgba(237,146,157,'+(newo*.6)+')');
g.addColorStop(1.0, 'rgba(126,22,40,0)');
con.fillStyle = g;
con.fill();
}
this.move = function() {
this.x += (this.rt/this.hl)*this.dx;
this.y += (this.rt/this.hl)*this.dy;
if(this.x > WIDTH || this.x < 0) this.dx *= -1;
if(this.y > HEIGHT || this.y < 0) this.dy *= -1;
}
this.getX = function() { return this.x; }
this.getY = function() { return this.y; }
}
有一件事我已經試過是改變con.arc變種是一個矩形認爲這可能是基因對圓圈進行評級,但是當我評論該特定行時,它會將該字段變成一個小矩形,而不是對象。
所以我猜想需要修改的是這個函數,我真的不知道/理解。任何幫助將不勝感激,謝謝!
看起來像正在製作徑向漸變的'g'變量的圓圈。 –