(function($) {

  $.registerLiquidCanvasPlugin({
    name: "rect",
    paint: function(area) {
      area.ctx.beginPath();
      area.ctx.rect(0, 0, area.width, area.height);
      area.ctx.closePath();
      if (this.action) this.action.paint(area);  // for chaining
    }
  });

  $.registerLiquidCanvasPlugin({
    name: "roundedRect",
    defaultOpts: { radius:20 },
    paint: function(area) {
      var ctx = area.ctx;
      var opts = this.opts;
      ctx.beginPath();
      ctx.moveTo(0, opts.radius);
      ctx.lineTo(0, area.height - opts.radius);
      ctx.quadraticCurveTo(0, area.height, opts.radius, area.height);
      ctx.lineTo(area.width - opts.radius, area.height);
      ctx.quadraticCurveTo(area.width, area.height, area.width, area.height - opts.radius);
      ctx.lineTo(area.width, opts.radius);
      ctx.quadraticCurveTo(area.width, 0, area.width - opts.radius, 0);
      ctx.lineTo(opts.radius, 0);
      ctx.quadraticCurveTo(0, 0, 0, opts.radius);
      ctx.closePath();
      if (this.action) this.action.paint(area);  // for chaining
    },
    shrink: function(area, steps) {
      this.defaultShrink(area, steps);
      this.opts.radius -= steps;
    }
  });

  $.registerLiquidCanvasPlugin({
 	name: "top_roundedRect",
 	defaultOpts: { radius:20 },
	paint: function(area) {
	  var ctx = area.ctx;
	  var opts = this.opts;
      ctx.beginPath();
      ctx.moveTo(0, opts.radius);
      ctx.lineTo(0, area.height);
      ctx.quadraticCurveTo(0, area.height, opts.radius, area.height);
      ctx.lineTo(area.width, area.height);
      ctx.quadraticCurveTo(area.width, area.height, area.width, area.height - opts.radius);
      ctx.lineTo(area.width, opts.radius);
      ctx.quadraticCurveTo(area.width, 0, area.width - opts.radius, 0);
      ctx.lineTo(opts.radius, 0);
      ctx.quadraticCurveTo(0, 0, 0, opts.radius);
      ctx.closePath();
	  if (this.action) this.action.paint(area); // for chaining
	},
 	shrink: function(area, steps) {
	  this.defaultShrink(area, steps);
	  this.opts.radius -= steps;
	}
  });

  $.registerLiquidCanvasPlugin({
 	name: "bottom_roundedRect",
 	defaultOpts: { radius:20 },
	paint: function(area) {
	  var ctx = area.ctx;
	  var opts = this.opts;
	  ctx.beginPath();
	  ctx.moveTo(0, opts.radius);
	  ctx.lineTo(0, area.height - opts.radius);
	  ctx.quadraticCurveTo(0, area.height, opts.radius, area.height);
	  ctx.lineTo(area.width - opts.radius, area.height);
	  ctx.quadraticCurveTo(area.width, area.height, area.width, area.height - opts.radius);
	  ctx.lineTo(area.width, 0);
	  ctx.quadraticCurveTo(area.width, 0, area.width - opts.radius, 0);
	  ctx.lineTo(0, 0);
	  ctx.quadraticCurveTo(0, 0, 0, opts.radius);
	  ctx.closePath();
	  if (this.action) this.action.paint(area); // for chaining
	},
 	shrink: function(area, steps) {
	  this.defaultShrink(area, steps);
	  this.opts.radius -= steps;
	}
  });

  $.registerLiquidCanvasPlugin({
    name: "custom_roundedRect",
    defaultOpts: { tl: false, tr: false, bl: false, br: false, radius:20 },
    paint: function(area) {
      var ctx = area.ctx;
      var opts = this.opts;
      ctx.beginPath();
      ctx.moveTo(0, opts.radius);

	  // bottom left corner
	  ctx.lineTo(0, (opts.bl == 'true')? area.height - opts.radius : area.height);
      ctx.quadraticCurveTo(0, area.height, opts.radius, area.height);

	  // bottom right corner
	  ctx.lineTo((opts.br == 'true')? area.width - opts.radius : area.width, area.height);
      ctx.quadraticCurveTo(area.width, area.height, area.width, area.height - opts.radius);

	  // top right corner
	  ctx.lineTo(area.width, (opts.tr == 'true')? opts.radius : 0);
      ctx.quadraticCurveTo(area.width, 0, area.width - opts.radius, 0);

	  // top left corner
	  ctx.lineTo((opts.tl == 'true')? opts.radius : 0, 0);
      ctx.quadraticCurveTo(0, 0, 0, opts.radius);

      ctx.closePath();
      if (this.action) this.action.paint(area);  // for chaining
    },
    shrink: function(area, steps) {
      this.defaultShrink(area, steps);
      this.opts.radius -= steps;
    }
  });



  // This is a Liquid Canvas Plugin
  $.registerLiquidCanvasPlugin({
    name: "fill",
    defaultOpts: { color:"#aaa" },
    paint: function(area) {
      area.ctx.fillStyle = this.opts.color;
      this.action.paint(area);
      area.ctx.fill();
    }
  });

  $.registerLiquidCanvasPlugin({  // hmmmmmmm, no rotation? no width??? ah patterns!
    name: "image",
    defaultOpts: { url:"http://www.ruzee.com/files/liquid-canvas-image.png" },
    paint: function(area) {
      var image = new Image();
      image.src = this.opts.url;
      image.onload = function() {
        area.ctx.drawImage(this, 0, 0);
      };
    }
  });

  // This is a Liquid Canvas Plugin
  $.registerLiquidCanvasPlugin({
    name: "gradient",
    defaultOpts: { from: "#fff", to:"#666" },
    paint: function(area) {
      var grad = area.ctx.createLinearGradient(0, 0, 0, area.height);
      grad.addColorStop(0, this.opts.from);
      grad.addColorStop(1, this.opts.to);
      area.ctx.fillStyle = grad;
      this.action.paint(area);
      area.ctx.fill();
    }
  });
  // End of Liquid Canvas Plugin

  $.registerLiquidCanvasPlugin({
    name: "shadow",
    defaultOpts: { width:3, color:'#000', shift:2 },
    paint: function(area) {
      var sw = this.opts.width;

      area.ctx.fillStyle = this.opts.color;
      area.ctx.globalAlpha = 1.0 / sw;
      for (var s = 0; s < sw; ++s) {
        this.action.paint(area);
        area.ctx.fill();
        this.action.shrink(area, 1);
      }
      area.ctx.globalAlpha = 1;
      area.ctx.translate(0, -this.opts.shift);
    }
  });

  $.registerLiquidCanvasPlugin({
    name: "border",
    defaultOpts: { color:'#8f4', width:3 },
    paint: function(area) {
      var bw = this.opts.width;
      area.ctx.strokeStyle = this.opts.color;
      area.ctx.lineWidth = bw;
      this.action.shrink(area, bw / 2);
      this.action.paint(area);
      area.ctx.stroke();
      this.action.shrink(area, bw / 2);
    }
  });

})(jQuery);