<?php 
/* 
* $Id: mod_geometryArray.js 608 2006-06-22 08:57:02Z uli $
* COPYRIGHT: (C) 2001 by ccgis. This program is free software under the GNU General Public
* http://www.mapbender.org/index.php/Mod_highlight.php
* License (>=v2). Read the file gpl.txt that comes with Mapbender for details. 
*/
require_once(dirname(__FILE__)."/point.js");
require_once(dirname(__FILE__)."/mod_geometryArray.js");
?>
function calculateVisibleDash (p0, p1, width, height) {
	if (p0.x > p1.x) {var p_temp = p0; p0 = p1; p1 = p_temp; p_temp = null;}
	var p = p0; var q = p1; var m; 
	if (p1.x != p0.x) {
		m = -(p1.y-p0.y)/(p1.x-p0.x); 
		if (p0.x < width && p1.x > 0 && !(p0.y < 0 && p1.y < 0) && !(p0.y > height && p1.y > height) ) {
			if (p0.x < 0) {
				var iy = p0.y - m*(0-p0.x);
				if (iy > 0 && iy < height) p = new Point(0, iy);
				else if (iy > height) {
				    var ix = p0.x+((p0.y - height)/m);
				    if (ix > 0 && ix < width) p = new Point(ix, height); else return false;
				}
				else if (iy < 0) {
				    var ix = p0.x+(p0.y/m);
				    if (ix > 0 && ix < width) p = new Point(ix, 0); else return false;
				}
				else return false;
			}
			else if (p0.y >= 0 && p0.y <= height) {p = p0;}
			else if (p0.y < 0) {
			    var ix = p0.x+(p0.y/m);
			    if (ix > 0 && ix < width) p = new Point(ix, 0); else return false;
			}
			else if (p0.y > height && m > 0) {
			    var ix = p0.x+((p0.y - height)/m);
			    if (ix > 0 && ix < width) p = new Point(ix, height); else return false;
			}
			else return false;
			if (p1.x > width) {
				var iy = p1.y - m*(width-p1.x);
				if (iy > 0 && iy < height) {q = new Point(width, iy);}
				else if (iy < 0) {
				    var ix = p0.x+(p0.y/m);
				    if (ix > 0 && ix < width) q = new Point(ix, 0); else return false;
				}
				else if (iy > height) {
				    var ix = p0.x+((p0.y - height)/m);
				    if (ix > 0 && ix < width) q = new Point(ix, height); else return false;
				}
				else return false;
			}
			else if (p1.y >= 0 && p1.y <= height) {q = p1;}
			else if (p1.y < 0) {
			    var ix = p1.x+(p1.y/m);
			    if (ix > 0 && ix < width) q = new Point(ix, 0); else return false;
			}
			else if (p1.y > height) {
			    var ix = p1.x+((p1.y- height)/m);
			    if (ix > 0 && ix < width) q = new Point(ix, height); else return false;
			}
		}
		else return false;
	}
	else {
		if (!(p0.y < 0 && p1.y < 0) && !(p0.y > height && p1.y > height)) {
			if (p0.y < 0) {p = new Point(p0.x, 0);}
			else if (p0.y > height) {p = new Point(p0.x, height);}
			else p = p0;
			if (p1.y < 0) {q = new Point(p0.x, 0);}
			else if (p1.y > height) {q = new Point(p0.x, height);}
			else q = p1;
		}
		else return false;
	}
	return new Array(new Point(Math.round(q.x), Math.round(q.y)), new Point(Math.round(p.x), Math.round(p.y)));
}
	
function Canvas(mapframe, tagname) {
	this.paint = function(gA) {
		if (this.checkTag()) {
			for (var q = 0; q < gA.count(); q++) {
				var m = gA.get(q);
				var t = m.geomtype;
				if (t == geomTypePoint)	this.drawGeometry(t,m);
				else {
					if (this.isTooSmall(m)){
						var newMember = new MultiGeometry(geomTypePoint);
						newMember.addGeometry();
						newMember.get(-1).addPoint(m.getCenter());
						this.drawGeometry(geomTypePoint,newMember);
					}
					else{
						if(t == geomTypeLine) this.drawGeometry(t,m);
						else if(t == geomTypePolygon) this.drawGeometry(t,m);
						else alert("unknown geomtype");
					}
				}
			}
			this.canvas.paint();
		}
	}
	
	this.drawGeometry = function(t,g){
		var mapObjInd = getMapObjIndexByName(this.mapframe);
		width = mb_mapObj[mapObjInd].width;
		height = mb_mapObj[mapObjInd].height;
		for(var i=0; i < g.count(); i++){
			if(t==geomTypePoint) {
				var p = realToMap(this.mapframe,g.get(i).get(0));
				if (p.x + this.diameter < mb_mapObj[mapObjInd].width && p.x - this.diameter > 0 &&
					p.y + this.diameter < mb_mapObj[mapObjInd].height && p.y - this.diameter > 0) {
					this.drawCircle(p.x-1,p.y-1,this.diameter,this.lineColor);
				}
			}
			else if(t==geomTypeLine) {
				for (var j=0; j<g.get(i).count()-1; j++) {
					var pq = calculateVisibleDash(realToMap(this.mapframe,g.get(i).get(j)), realToMap(this.mapframe,g.get(i).get(j+1)), width, height);
					if (pq) {
						this.drawLine(new Array(pq[0].x, pq[1].x),new Array(pq[0].y, pq[1].y),this.lineColor);
					}
				}
			}
			else if(t==geomTypePolygon) {
				for (var j=0; j<g.get(i).count()-1; j++) {
					var pq = calculateVisibleDash(realToMap(this.mapframe,g.get(i).get(j)), realToMap(this.mapframe,g.get(i).get(j+1)), width, height);
					if (pq) {
						this.drawLine(new Array(pq[0].x, pq[1].x),new Array(pq[0].y, pq[1].y),this.lineColor);
					}
				}
			}
		}
	}
	
	this.isTooSmall = function(g){
		var tmp = g.getBBox();
		var min = realToMap(this.mapframe,tmp[0]);
		var max = realToMap(this.mapframe,tmp[1]);
		if((max.x - min.x < this.minWidth) && (max.y - min.y < this.minWidth)) return true;
		return false;
	}
	
	this.clean = function () {
		var el = window.frames[mapframe].document.getElementById(tagname);
		if (el) el.innerHTML = "";
	}

	this.drawCircle = function(x, y, diameter, color) {
		this.canvas.setColor(color);
		this.canvas.drawEllipse(x-diameter/2,y-diameter/2,diameter,diameter);
	}

	this.drawLine = function(x_array, y_array, color) {
		this.canvas.setColor(color);
		this.canvas.drawPolyline(x_array, y_array);
	}

	this.drawPolygon = function(x_array, y_array, color) {
		this.canvas.setColor(color);
		this.canvas.drawPolygon(x_array, y_array);
	}

	this.checkTag = function () {
		if (typeof(window.frames[this.mapframe]) != 'undefined') {
			var isTag = (window.frames[this.mapframe].document.getElementById(this.tagname))?1:0;
			if(isTag == 0){
				var draw = window.frames[this.mapframe].document.createElement("div");
				var tmp = window.frames[this.mapframe].document.getElementsByTagName("body")[0].appendChild(draw);
				tmp.setAttribute("id",this.tagname);
				tmp.setAttribute("style","position:absolute;top:0px;left:0px;width:0px;height:0px;z-index:100");
				//prompt("",window.frames[this.mapframe].document.getElementById(this.tagname).innerHTML);
			}
			else {
				this.clean();
			}
			return true;
		}
		return false;
	}

	this.mapframe = mapframe;
	this.tagname = tagname;
	if (this.checkTag()) {
		this.canvas = new jsGraphics(this.tagname, window.frames[this.mapframe]);
		this.canvas.setStroke(3);
		mb_registerPanSubElement(this.tagname);
	}
	this.diameter = 8;
	this.minWidth = 8;
	this.lineColor = "#ff0000";
}

function Highlight(target_array, tagname) {
	this.del = function(m) {
		this.gA.removeMultiGeometry(m);
		this.paint();
	}

	this.add = function(m) {
		this.gA.appendMember(m);
		this.paint();
	}

	this.paint = function() {
		for (q in this.canvas) this.canvas[q].clean();
		for(var i=0; i<this.targets.length; i++){
			this.canvas[this.targets[i]] = new Canvas(this.targets[i], this.tagname);
			this.canvas[this.targets[i]].paint(this.gA);
		}
	}

	this.tagname = 'mod_gaz_draw'+tagname;
	this.targets = target_array;
	this.canvas = new Array();
	this.gA = new GeometryArray();


	this.paint();
}