Rotate an image in the canvas

jsFiddle：https ://jsfiddle.net/CanvasCode/u0p9wtut/

var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");

var Particle = function(xSet, ySet)
{
    this.XPos = xSet;
    this.YPos = ySet;
    this.Sprite = new Image();
        this.Sprite.src = "http://s.cdn.gaiaonline.com/images/thumbnails/85449184bbb9.png";
    this.Rotation = 0;
}

var particles = new Array();

for(var i = 0; i < 10; i++){
    particles.push(new Particle(Math.random()*c.width, Math.random()*c.height));
}

function draw()
{
  ctx.fillStyle = "#000";
  ctx.fillRect(0,0,c.width,c.height);

    for(var i = 0; i < particles.length; i++)
    {
      var particle = particles[i];
      particle.YPos += 1;

      // Draw image rotated
      ctx.save();

      ctx.save();
      ctx.translate(particle.XPos + particle.Sprite.width / 2, particle.YPos + particle.Sprite.height / 2);
            ctx.rotate( particle.Rotation );
            ctx.translate(-(particle.XPos + (particle.Sprite.width / 2)), -(particle.YPos));
      ctx.drawImage(particle.Sprite, particle.XPos, particle.YPos);
      ctx.restore();

      ctx.restore();

      if(particle.YPos > c.height)
        {
          particle.YPos = 0;
          particle.XPos = Math.random()*c.width;
        }

      particle.Rotation += 0.01;
    }
}

setInterval(draw, 3);

What you can do is use ctx.save, ctx.restoreand ctx.translate, you just save your canvas background first, so we can reload it later, and we convert to canvas, basically the translation is like setting where to draw the image offset, we set The given translation position is to the center of the sprite, and then we rotate around the image (translation means we will rotate the image around the center point of the image). Then we update the translation again, draw the rotated image, and restore the canvas context because we might want to draw something else. If we don't restore the context, the next image drawn will take translation and rotation into account.