html5+canvas繪製抽象液體流動火焰動畫特效

程式碼片段：

函數繪製（）{

canvas.width = window.innerWidth;
canvas.height = window.innerHeight;

if(動畫&&圓){
t = (t+0.1)%(TWO_PI);
x_new = Math.round(寬度/2 + 寬度/4* Math.cos(t));
y_new = Math.round(高度/2 + 高度/4* Math.sin(t));
幹擾線(x_new, y_new);

x_old = x_new;
y_舊 = y_新;
}

vel_step(u_, v_, u_old_, v_old_, visc_, dt_);
dens_step(dens_, dens_old_, u_, v_, diff_, dt_);
繪製紋理（）；
ctx_2.putImageData(plot_rgba, 0, 0);
//ctx.drawImage(canvas_2,0,0,寬度,高度,0,0,canvas.width,canvas.height);
ctx.drawImage(canvas_2,0,0,寬度,高度,window.innerWidth/2-hwidth, window.innerHeight/2-hheight, canvas_2.width, canvas_2.height);
window.requestAnimationFrame(draw);
}
繪製（）；