wz_jsgraphics.js

可以生成简单的柱状图和饼状图

/* This notice must be untouched at all times.

wz_jsgraphics.js    v. 3.01
The latest version is available at
http://www.walterzorn.com
or http://www.devira.com
or http://www.walterzorn.de

Copyright (c) 2002-2004 Walter Zorn. All rights reserved.
Created 3. 11. 2002 by Walter Zorn (Web: http://www.walterzorn.com )
Last modified: 1. 6. 2007

Performance optimizations for Internet Explorer
by Thomas Frank and John Holdsworth.
fillPolygon method implemented by Matthieu Haller.

High Performance JavaScript Graphics Library.
Provides methods
- to draw lines, rectangles, ellipses, polygons
	with specifiable line thickness,
- to fill rectangles, polygons, ellipses and arcs
- to draw text.
NOTE: Operations, functions and branching have rather been optimized
to efficiency and speed than to shortness of source code.

LICENSE: LGPL

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License (LGPL) as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA,
or see http://www.gnu.org/copyleft/lesser.html
*/


var jg_ok, jg_ie, jg_fast, jg_dom, jg_moz;


function _chkDHTM(x, i)
{
	x = document.body || null;
	jg_ie = x && typeof x.insertAdjacentHTML != "undefined" && document.createElement;
	jg_dom = (x && !jg_ie &&
		typeof x.appendChild != "undefined" &&
		typeof document.createRange != "undefined" &&
		typeof (i = document.createRange()).setStartBefore != "undefined" &&
		typeof i.createContextualFragment != "undefined");
	jg_fast = jg_ie && document.all && !window.opera;
	jg_moz = jg_dom && typeof x.style.MozOpacity != "undefined";
	jg_ok = !!(jg_ie || jg_dom);
}

function _pntCnvDom()
{
	var x = this.wnd.document.createRange();
	x.setStartBefore(this.cnv);
	x = x.createContextualFragment(jg_fast? this._htmRpc() : this.htm);
	if(this.cnv) this.cnv.appendChild(x);
	this.htm = "";
}

function _pntCnvIe()
{
	if(this.cnv) this.cnv.insertAdjacentHTML("BeforeEnd", jg_fast? this._htmRpc() : this.htm);
	this.htm = "";
}

function _pntDoc()
{
	this.wnd.document.write(jg_fast? this._htmRpc() : this.htm);
	this.htm = '';
}

function _pntN()
{
	;
}

function _mkDiv(x, y, w, h)
{
	this.htm += '<div style="position:absolute;'+
		'left:' + x + 'px;'+
		'top:' + y + 'px;'+
		'width:' + w + 'px;'+
		'height:' + h + 'px;'+
		'clip:rect(0,'+w+'px,'+h+'px,0);'+
		'background-color:' + this.color +
		(!jg_moz? ';overflow:hidden' : '')+
		';"><\/div>';
}

function _mkDivIe(x, y, w, h)
{
	this.htm += '%%'+this.color+';'+x+';'+y+';'+w+';'+h+';';
}

function _mkDivPrt(x, y, w, h)
{
	this.htm += '<div style="position:absolute;'+
		'border-left:' + w + 'px solid ' + this.color + ';'+
		'left:' + x + 'px;'+
		'top:' + y + 'px;'+
		'width:0px;'+
		'height:' + h + 'px;'+
		'clip:rect(0,'+w+'px,'+h+'px,0);'+
		'background-color:' + this.color +
		(!jg_moz? ';overflow:hidden' : '')+
		';"><\/div>';
}

var _regex =  /%%([^;]+);([^;]+);([^;]+);([^;]+);([^;]+);/g;
function _htmRpc()
{
	return this.htm.replace(
		_regex,
		'<div style="overflow:hidden;position:absolute;background-color:'+
		'$1;left:$2;top:$3;width:$4;height:$5"></div>\n');
}

function _htmPrtRpc()
{
	return this.htm.replace(
		_regex,
		'<div style="overflow:hidden;position:absolute;background-color:'+
		'$1;left:$2;top:$3;width:$4;height:$5;border-left:$4px solid $1"></div>\n');
}

function _mkLin(x1, y1, x2, y2)
{
	if(x1 > x2)
	{
		var _x2 = x2;
		var _y2 = y2;
		x2 = x1;
		y2 = y1;
		x1 = _x2;
		y1 = _y2;
	}
	var dx = x2-x1, dy = Math.abs(y2-y1),
	x = x1, y = y1,
	yIncr = (y1 > y2)? -1 : 1;

	if(dx >= dy)
	{
		var pr = dy<<1,
		pru = pr - (dx<<1),
		p = pr-dx,
		ox = x;
		while(dx > 0)
		{--dx;
			++x;
			if(p > 0)
			{
				this._mkDiv(ox, y, x-ox, 1);
				y += yIncr;
				p += pru;
				ox = x;
			}
			else p += pr;
		}
		this._mkDiv(ox, y, x2-ox+1, 1);
	}

	else
	{
		var pr = dx<<1,
		pru = pr - (dy<<1),
		p = pr-dy,
		oy = y;
		if(y2 <= y1)
		{
			while(dy > 0)
			{--dy;
				if(p > 0)
				{
					this._mkDiv(x++, y, 1, oy-y+1);
					y += yIncr;
					p += pru;
					oy = y;
				}
				else
				{
					y += yIncr;
					p += pr;
				}
			}
			this._mkDiv(x2, y2, 1, oy-y2+1);
		}
		else
		{
			while(dy > 0)
			{--dy;
				y += yIncr;
				if(p > 0)
				{
					this._mkDiv(x++, oy, 1, y-oy);
					p += pru;
					oy = y;
				}
				else p += pr;
			}
			this._mkDiv(x2, oy, 1, y2-oy+1);
		}
	}
}

function _mkLin2D(x1, y1, x2, y2)
{
	if(x1 > x2)
	{
		var _x2 = x2;
		var _y2 = y2;
		x2 = x1;
		y2 = y1;
		x1 = _x2;
		y1 = _y2;
	}
	var dx = x2-x1, dy = Math.abs(y2-y1),
	x = x1, y = y1,
	yIncr = (y1 > y2)? -1 : 1;

	var s = this.stroke;
	if(dx >= dy)
	{
		if(dx > 0 && s-3 > 0)
		{
			var _s = (s*dx*Math.sqrt(1+dy*dy/(dx*dx))-dx-(s>>1)*dy) / dx;
			_s = (!(s-4)? Math.ceil(_s) : Math.round(_s)) + 1;
		}
		else var _s = s;
		var ad = Math.ceil(s/2);

		var pr = dy<<1,
		pru = pr - (dx<<1),
		p = pr-dx,
		ox = x;
		while(dx > 0)
		{--dx;
			++x;
			if(p > 0)
			{
				this._mkDiv(ox, y, x-ox+ad, _s);
				y += yIncr;
				p += pru;
				ox = x;
			}
			else p += pr;
		}
		this._mkDiv(ox, y, x2-ox+ad+1, _s);
	}

	else
	{
		if(s-3 > 0)
		{
			var _s = (s*dy*Math.sqrt(1+dx*dx/(dy*dy))-(s>>1)*dx-dy) / dy;
			_s = (!(s-4)? Math.ceil(_s) : Math.round(_s)) + 1;
		}
		else var _s = s;
		var ad = Math.round(s/2);

		var pr = dx<<1,
		pru = pr - (dy<<1),
		p = pr-dy,
		oy = y;
		if(y2 <= y1)
		{
			++ad;
			while(dy > 0)
			{--dy;
				if(p > 0)
				{
					this._mkDiv(x++, y, _s, oy-y+ad);
					y += yIncr;
					p += pru;
					oy = y;
				}
				else
				{
					y += yIncr;
					p += pr;
				}
			}
			this._mkDiv(x2, y2, _s, oy-y2+ad);
		}
		else
		{
			while(dy > 0)
			{--dy;
				y += yIncr;
				if(p > 0)
				{
					this._mkDiv(x++, oy, _s, y-oy+ad);
					p += pru;
					oy = y;
				}
				else p += pr;
			}
			this._mkDiv(x2, oy, _s, y2-oy+ad+1);
		}
	}
}

function _mkLinDott(x1, y1, x2, y2)
{
	if(x1 > x2)
	{
		var _x2 = x2;
		var _y2 = y2;
		x2 = x1;
		y2 = y1;
		x1 = _x2;
		y1 = _y2;
	}
	var dx = x2-x1, dy = Math.abs(y2-y1),
	x = x1, y = y1,
	yIncr = (y1 > y2)? -1 : 1,
	drw = true;
	if(dx >= dy)
	{
		var pr = dy<<1,
		pru = pr - (dx<<1),
		p = pr-dx;
		while(dx > 0)
		{--dx;
			if(drw) this._mkDiv(x, y, 1, 1);
			drw = !drw;
			if(p > 0)
			{
				y += yIncr;
				p += pru;
			}
			else p += pr;
			++x;
		}
	}
	else
	{
		var pr = dx<<1,
		pru = pr - (dy<<1),
		p = pr-dy;
		while(dy > 0)
		{--dy;
			if(drw) this._mkDiv(x, y, 1, 1);
			drw = !drw;
			y += yIncr;
			if(p > 0)
			{
				++x;
				p += pru;
			}
			else p += pr;
		}
	}
	if(drw) this._mkDiv(x, y, 1, 1);
}

function _mkOv(left, top, width, height)
{
	var a = (++width)>>1, b = (++height)>>1,
	wod = width&1, hod = height&1,
	cx = left+a, cy = top+b,
	x = 0, y = b,
	ox = 0, oy = b,
	aa2 = (a*a)<<1, aa4 = aa2<<1, bb2 = (b*b)<<1, bb4 = bb2<<1,
	st = (aa2>>1)*(1-(b<<1)) + bb2,
	tt = (bb2>>1) - aa2*((b<<1)-1),
	w, h;
	while(y > 0)
	{
		if(st < 0)
		{
			st += bb2*((x<<1)+3);
			tt += bb4*(++x);
		}
		else if(tt < 0)
		{
			st += bb2*((x<<1)+3) - aa4*(y-1);
			tt += bb4*(++x) - aa2*(((y--)<<1)-3);
			w = x-ox;
			h = oy-y;
			if((w&2) && (h&2))
			{
				this._mkOvQds(cx, cy, x-2, y+2, 1, 1, wod, hod);
				this._mkOvQds(cx, cy, x-1, y+1, 1, 1, wod, hod);
			}
			else this._mkOvQds(cx, cy, x-1, oy, w, h, wod, hod);
			ox = x;
			oy = y;
		}
		else
		{
			tt -= aa2*((y<<1)-3);
			st -= aa4*(--y);
		}
	}
	w = a-ox+1;
	h = (oy<<1)+hod;
	y = cy-oy;
	this._mkDiv(cx-a, y, w, h);
	this._mkDiv(cx+ox+wod-1, y, w, h);
}

function _mkOv2D(left, top, width, height)
{
	var s = this.stroke;
	width += s+1;
	height += s+1;
	var a = width>>1, b = height>>1,
	wod = width&1, hod = height&1,
	cx = left+a, cy = top+b,
	x = 0, y = b,
	aa2 = (a*a)<<1, aa4 = aa2<<1, bb2 = (b*b)<<1, bb4 = bb2<<1,
	st = (aa2>>1)*(1-(b<<1)) + bb2,
	tt = (bb2>>1) - aa2*((b<<1)-1);

	if(s-4 < 0 && (!(s-2) || width-51 > 0 && height-51 > 0))
	{
		var ox = 0, oy = b,
		w, h,
		pxw;
		while(y > 0)
		{
			if(st < 0)
			{
				st += bb2*((x<<1)+3);
				tt += bb4*(++x);
			}
			else if(tt < 0)
			{
				st += bb2*((x<<1)+3) - aa4*(y-1);
				tt += bb4*(++x) - aa2*(((y--)<<1)-3);
				w = x-ox;
				h = oy-y;

				if(w-1)
				{
					pxw = w+1+(s&1);
					h = s;
				}
				else if(h-1)
				{
					pxw = s;
					h += 1+(s&1);
				}
				else pxw = h = s;
				this._mkOvQds(cx, cy, x-1, oy, pxw, h, wod, hod);
				ox = x;
				oy = y;
			}
			else
			{
				tt -= aa2*((y<<1)-3);
				st -= aa4*(--y);
			}
		}
		this._mkDiv(cx-a, cy-oy, s, (oy<<1)+hod);
		this._mkDiv(cx+a+wod-s, cy-oy, s, (oy<<1)+hod);
	}

	else
	{
		var _a = (width-(s<<1))>>1,
		_b = (height-(s<<1))>>1,
		_x = 0, _y = _b,
		_aa2 = (_a*_a)<<1, _aa4 = _aa2<<1, _bb2 = (_b*_b)<<1, _bb4 = _bb2<<1,
		_st = (_aa2>>1)*(1-(_b<<1)) + _bb2,
		_tt = (_bb2>>1) - _aa2*((_b<<1)-1),

		pxl = new Array(),
		pxt = new Array(),
		_pxb = new Array();
		pxl[0] = 0;
		pxt[0] = b;
		_pxb[0] = _b-1;
		while(y > 0)
		{
			if(st < 0)
			{
				pxl[pxl.length] = x;
				pxt[pxt.length] = y;
				st += bb2*((x<<1)+3);
				tt += bb4*(++x);
			}
			else if(tt < 0)
			{
				pxl[pxl.length] = x;
				st += bb2*((x<<1)+3) - aa4*(y-1);
				tt += bb4*(++x) - aa2*(((y--)<<1)-3);
				pxt[pxt.length] = y;
			}
			else
			{
				tt -= aa2*((y<<1)-3);
				st -= aa4*(--y);
			}

			if(_y > 0)
			{
				if(_st < 0)
				{
					_st += _bb2*((_x<<1)+3);
					_tt += _bb4*(++_x);
					_pxb[_pxb.length] = _y-1;
				}
				else if(_tt < 0)
				{
					_st += _bb2*((_x<<1)+3) - _aa4*(_y-1);
					_tt += _bb4*(++_x) - _aa2*(((_y--)<<1)-3);
					_pxb[_pxb.length] = _y-1;
				}
				else
				{
					_tt -= _aa2*((_y<<1)-3);
					_st -= _aa4*(--_y);
					_pxb[_pxb.length-1]--;
				}
			}
		}

		var ox = -wod, oy = b,
		_oy = _pxb[0],
		l = pxl.length,
		w, h;
		for(var i = 0; i < l; i++)
		{
			if(typeof _pxb[i] != "undefined")
			{
				if(_pxb[i] < _oy || pxt[i] < oy)
				{
					x = pxl[i];
					this._mkOvQds(cx, cy, x, oy, x-ox, oy-_oy, wod, hod);
					ox = x;
					oy = pxt[i];
					_oy = _pxb[i];
				}
			}
			else
			{
				x = pxl[i];
				this._mkDiv(cx-x, cy-oy, 1, (oy<<1)+hod);
				this._mkDiv(cx+ox+wod, cy-oy, 1, (oy<<1)+hod);
				ox = x;
				oy = pxt[i];