map.draw = new function(){

	var base = this

	base.animate = function(){
		ctx.save()
		map.draw.clear_canvas()
		map.draw.ruler()

		ctx.translate( map.bounds.a * 1/2, map.bounds.b * 1/2)
		ctx.scale( map.zoom, map.zoom )
		ctx.translate( map.center.a,  map.center.b)
		ctx.scale( -1, 1 )

		map.draw.regions(clipper.regions)
		map.draw.mouse(map.ui.mouse.cursor)
		map.draw.coords()
		scene && map.draw.camera(scene.camera)

		ctx.restore()
	}

	base.clear_canvas = function(){
		ctx.fillStyle = "rgba(255,255,255,0.99)"
		ctx.clearRect(0,0,w,h)
		ctx.fillRect(0,0,w,h)
	}

	base.ruler = function (){
		ctx.strokeStyle = "rgba(80,80,80,0.5)"
		ctx.lineWidth = 1
		var len = 5
		for (var i = 0.5; i < w; i += 10) {
			line(i, 0, i, len)
			line(0, i, len, i)
		}
	}

	base.regions = function(regions){
		for (var i = 0; i < regions.length; i++) {
			if (regions[i].dupe) continue
			ctx.fillStyle = colors[i % colors.length]
			fill_region(regions[i])
			stroke_sides(regions[i])
		}
	}

	base.mouse = function(mouse){
		var radius = 5 / map.zoom
	
		ctx.fillStyle = "rgba(255,0,0,0.4)";
		ctx.beginPath();
		ctx.arc(mouse.x.b, mouse.y.b, radius, 0, 2*Math.PI, false);
		ctx.fill();

		if (mouse.width() != 0 && mouse.height() != 0) {
			if (map.ui.dragging) {
				stroke_rect(mouse)
			}
			else {
				ctx.fillStyle = "rgba(255,255,0,0.5)"
				fill_region( mouse.clone().translate() )
			}
		}
	}
	
	base.camera = function(cam){
 		ctx.lineWidth = 0.5

		ctx.save()

		ctx.translate(cam.x, cam.z)
		ctx.rotate(cam.rotationY)

		var radius = 3 / map.zoom

		ctx.fillStyle = '#888';
		
		ctx.beginPath();
		ctx.moveTo(0,0)
		ctx.lineTo(-radius,-radius/2)
		ctx.lineTo(0,radius*3)
		ctx.lineTo(radius,-radius/2)
		ctx.moveTo(0,0)
		ctx.fill()
		
		ctx.restore()
	}

	base.coords = function(){
		ctx.fillStyle = "#888";
		dot_at(0,0)
		ctx.fillStyle = "#bbb";
		dot_at(100,0)
		dot_at(0,100)
		ctx.fillStyle = "#ddd";
		dot_at(200,0)
		dot_at(0,200)
		ctx.fillStyle = "#eee";
		dot_at(300,0)
		dot_at(0,300)
		
		ctx.strokeStyle = "rgba(0,0,0,0.1)"
		ctx.lineWidth = 1/map.zoom
		
		var sides = map.sides()
		var quant = sides.clone().quantize(200)
		for (var x = quant.x.a - 200; x <= quant.x.b; x += 200) {
			line(x, sides.y.a, x, sides.y.b)
		}
		for (var y = quant.y.a - 200; y <= quant.y.b; y += 200) {
			line(sides.x.a, y, sides.x.b, y)
		}
	}

	//

	function line (x,y,a,b,translation){
		if (translation) {
			x += translation.a
			a += translation.a
			y += translation.b
			b += translation.b
		}
		ctx.beginPath()
		ctx.moveTo(x,y)
		ctx.lineTo(a,b)
		ctx.stroke()
	}

	function fill_region(r){
		ctx.fillRect(r.x.a + r.translation.a,
								 r.y.a + r.translation.b,
								 r.x.length(),
								 r.y.length())
	}

	function stroke_sides (r){
		if (r.sides & FRONT) line(r.x.a, r.y.a, r.x.b, r.y.a)
		if (r.sides &  BACK) line(r.x.a, r.y.b, r.x.b, r.y.b)
		if (r.sides &  LEFT) line(r.x.a, r.y.a, r.x.a, r.y.b)
		if (r.sides & RIGHT) line(r.x.b, r.y.a, r.x.b, r.y.b)
	}

	function stroke_rect (r){
		line(r.x.a, r.y.a, r.x.b, r.y.b, r.translation)
	}

	function dot_at (x,z){
		ctx.save()
		ctx.translate(x,z)

		var radius = 3 / map.zoom

		ctx.beginPath();
		ctx.arc(0, 0, radius, 0, 2*Math.PI, false);
		ctx.fill();

		ctx.restore()
	}
}