/*
 *  $Id: canvas.js,v 1.6.2.2 2010/04/06 16:46:11 source Exp $
 *
 *  This file is part of the OpenLink Software Ajax Toolkit (OAT) project.
 *
 *  Copyright (C) 2005-2010 OpenLink Software
 *
 *  See LICENSE file for details.
 */
/*
	new OAT.Canvas(canvas);
	Canvas.point(x,y,color);
	Canvas.circle(x,y,r,color);
	Canvas.save();
	Canvas.restore();
	Canvas.clear();
	Canvas.line(points,color);
	Canvas.poly(x1,y1,x2,y2,color);
*/

OAT.Canvas = function(canvas) {
	this.elm = $(canvas);
	this.ctx = this.elm.getContext('2d');
	this.point = function(x,y,color) {
		this.ctx.fillStyle = color;
		this.ctx.fillRect(x,y,1,1);
	}
	this.circle = function(x,y,r,color) {
		this.ctx.fillStyle = color;
		this.ctx.beginPath();
		this.ctx.arc(x,y,r,0,Math.PI*2,1);
		this.ctx.fill();
	}
	this.save = function() {
		this.ctx.save();
	}
	this.restore = function() {
		this.ctx.restore();
	}
	this.clear = function() {
		var w = this.elm.getAttribute("width");
		var h = this.elm.getAttribute("height");
		this.ctx.clearRect(0,0,w,h);
	}
	this.beginPath = function() {
		this.ctx.beginPath();
	}
	this.closePath = function() {
		this.ctx.closePath();
	}
	this.line = function(points,color) {
		for (var i=0;i<points.length;i++) {
			if (i==0) {
				this.ctx.beginPath();
				this.ctx.moveTo(points[i][0],points[i][1]);
			} else {
				this.ctx.lineTo(points[i][0],points[i][1]);
			}
		}
		this.ctx.strokeStyle = color;
		this.ctx.stroke();
	}
	this.poly = function(x1,y1,x2,y2,color) {
		this.ctx.beginPath();
		this.ctx.moveTo(x1,y1);
		this.ctx.bezierCurveTo((x1+x2)/2-10,(y1+y2)/2-10,(x1+x2)/2+10,(y1+y2)/2+10,x2,y2);
		this.ctx.strokeStyle = color;
		this.ctx.stroke();
	}
}
