ugkpainter.cpp

linux下一款GIS程序源码

/* ugkpainter.cpp */

#include "ugkpainter.h"
#include <qpointarray.h> 
#include <math.h>
#include <assert.h>
#include "UGKGlobalFunc.h"


#define PI 3.1415926


UGKPainter::UGKPainter(const QPaintDevice *pd, bool unclipped):
	QPainter(pd)
{

}


/************************************************
    简单判断一下,一条直线是否与矩形相交
    如果相交,则用x1,y1,x2,y2来保存在矩形
    中的那段线段的坐标
************************************************/
bool UGKPainter::lineInPaintRect(int x1,int y1,int x2,int y2,QRect pRect)
{
    LineCoord ln;
    ln.start.x = x1;
    ln.start.y = y1;
    ln.end.x = x2;
    ln.end.y = y2;
    PTCoord a,b;
    if( LineRect( ln, pRect) )
	return TRUE;  
    else
	return FALSE;

}
void UGKPainter::getLineBox(int x1,int y1, int x2, int y2,LineBox &lnBox)
{
    double ang;
    int aX,aY,bX,bY,cX,cY,dX,dY;
    if( (x2>x1)&&(y2>y1) )//一象限
    {
	ang=atan( 1.0*(y2-y1)/(x2-x1));
	aX = int(x1 +2*sin(ang));
	aY = int(y1 -2*cos(ang));
	bX = int(x1 -2*sin(ang));
	bY = int(y1 +2*cos(ang));
	cX = int(x2 +2*sin(ang));
	cY = int(y2 -2*cos(ang));
	dX = int(x2 -2*sin(ang));
	dY = int(y2 +2*cos(ang));	   
    }
    else if( (x1>x2)&&(y2>y1) )//二象限
    {
	ang=atan( 1.0*(y2-y1)/(x1-x2));
	aX = int(x1+2*sin(ang));
	aY = int(y1+2*cos(ang));
	bX = int(x1-2*sin(ang));
	bY = int(y1-2*cos(ang));
	cX = int(x2+2*sin(ang));
	cY = int(y2+2*cos(ang));
	dX = int(x2-2*sin(ang));
	dY = int(y2-2*cos(ang));
    }
    else if( (x1>x2)&&(y1>y2) )//三象限
    {
	ang=atan(1.0*(y1-y2)/(x1-x2));
	aX = int(x1-2*sin(ang));
	aY = int(y1+2*cos(ang));
	bX = int(x1+2*sin(ang));
	bY = int(y1-2*cos(ang));
	cX = int(x2-2*sin(ang));
	cY = int(y2+2*cos(ang));
	dX = int(x2+2*sin(ang));
	dY = int(y2-2*cos(ang));	
    }
    else if( (x2>x1)&&(y1>y2) )//四象限
    {
	ang=atan(1.0*(y1-y2)/(x2-x1));
	aX = int(x1-2*sin(ang));
	aY = int(y1-2*cos(ang));
	bX = int(x1+2*sin(ang));
	bY = int(y1+2*cos(ang));
	cX = int(x2-2*sin(ang));
	cY = int(y2-2*cos(ang));
	dX = int(x2+2*sin(ang));
	dY = int(y2+2*cos(ang));	
    }
    else if( (x2==x1)&&(y2>y1) )
    {
	aX = x1 +2;
	aY = y1;
	bX = x1-2;
	bY = y1;
	cX = x1 +2;
	cY = y2;
	dX = x1-2;
	dY = y2;
	
    }
    else if( (x2==x1)&&(y2<y1) )
    {
	aX = x1 -2;
	aY = y1;
	bX = x1+2;
	bY = y1;
	cX = x1 -2;
	cY = y2;
	dX = x1+2;
	dY = y2;

    }
    else if( (x2>x1)&&(y2==y1) )
    {
	aX = x1;
	aY = y1 -2;
	bX = x1;
	bY = y1 +2;
	cX = x2;
	cY = y1 -2;
	dX = x2;
	dY = y1 +2;

    }
    else if( (x2<x1)&&(y2==y1) )
    {
	aX = x1;
	aY = y1 +2;
	bX = x1;
	bY = y1 -2;
	cX = x2;
	cY = y1 +2;
	dX = x2;
	dY = y1 -2;

    }
    else
	assert(FALSE);//Error;
    
   lnBox.leftStart.setX(aX);
   lnBox.leftStart.setY(aY);
   lnBox.leftEnd.setX(cX);
   lnBox.leftEnd.setY(cY);
   lnBox.rightStart.setX(bX);
   lnBox.rightStart.setY(bY);
   lnBox.rightEnd.setX(dX);
   lnBox.rightEnd.setY(dY);
   
}


/********************************************************
               用指定线型绘制直线
********************************************************/
void UGKPainter::drawGISLine(const QPointArray & a,int linenum,QRect pRect,QColor cl)
{
    switch(linenum)
    {
    case 1:
	{
	    save();
	    QPen pen(Qt::NoPen);
	    pen.setColor(cl);
	    setPen(pen);	    

	    int x1,y1,x2,y2;
	    a.point(0,&x1,&y1);
	    for(int i=1;i<a.size();i++)
	    {
		a.point(i,&x2,&y2);
		if( (x1==x2)&&(y1==y2) )
		    continue;
		if( lineInPaintRect(x1,y1,x2,y2,pRect) )
		{
			drawLine(x1,y1,x2,y2);
		}		
		x1= x2;
		y1= y2;
	    }	    
	    restore();
	    break;
	}
    case 2:
	{
	    save();
	    QPen pen(Qt::SolidLine);
	    pen.setColor(cl);
	    setPen(pen);
	    	 
	    int x1,y1,x2,y2;
	    a.point(0,&x1,&y1);
	    for(int i=1;i<a.size();i++)
	    {
		a.point(i,&x2,&y2);
		if( (x1==x2)&&(y1==y2) )
		    continue;
		if( lineInPaintRect(x1,y1,x2,y2,pRect) )
		{
			drawLine(x1,y1,x2,y2);
		}
		
		x1= x2;
		y1= y2;
	    }
	    
	    restore();
	    
	    break;	    
	}
    case 3:
    case 4:
	{
	    save();
	    QPen pen(Qt::DotLine);
	    pen.setColor(cl);
	    setPen(pen);
	    int x1,y1,x2,y2;
	    a.point(0,&x1,&y1);
	    for(int i=1;i<a.size();i++)
	    {
		a.point(i,&x2,&y2);
		if( (x1==x2)&&(y1==y2) )
		    continue;

		if( lineInPaintRect(x1,y1,x2,y2,pRect) )
		{
			drawLine(x1,y1,x2,y2);
		}
		
		x1= x2;
		y1= y2;
	    }	    
	    restore();
	    break;	    
	}
    case 5:
	{
	    save();
	    QPen pen(Qt::DashLine);
	    pen.setColor(cl);
	    pen.setWidth(2);
	    setPen(pen);
	    int x1,y1,x2,y2;
	    a.point(0,&x1,&y1);
	    for(int i=1;i<a.size();i++)
	    {
		a.point(i,&x2,&y2);
		if( (x1==x2)&&(y1==y2) )
		    continue;

		if( lineInPaintRect(x1,y1,x2,y2,pRect) )
		{
			drawLine(x1,y1,x2,y2);
		}
		
		x1= x2;
		y1= y2;
	    }	    
	    restore();
	    break;	    
	}
    case 6:
	{
	    save();
	    QPen pen(Qt::DashLine);
	    pen.setColor(cl);
	    pen.setWidth(3);
	    setPen(pen);
	    int x1,y1,x2,y2;
	    a.point(0,&x1,&y1);
	    for(int i=1;i<a.size();i++)
	    {
		a.point(i,&x2,&y2);
		if( (x1==x2)&&(y1==y2) )
		    continue;
		if( lineInPaintRect(x1,y1,x2,y2,pRect) )
		{
			drawLine(x1,y1,x2,y2);
		}		
		x1= x2;
		y1= y2;
	    }	    
	    restore();
	    break;	    
	}
    case 7:
	{
	    save();
	    QPen pen(Qt::DashLine);
	    pen.setColor(cl);
	    setPen(pen);
	    int x1,y1,x2,y2;
	    a.point(0,&x1,&y1);
	    for(int i=1;i<a.size();i++)
	    {
		a.point(i,&x2,&y2);
		if( (x1==x2)&&(y1==y2) )
		    continue;
		if( lineInPaintRect(x1,y1,x2,y2,pRect) )
		{
			drawLine(x1,y1,x2,y2);
		}		
		x1= x2;
		y1= y2;
	    }	    
	    restore();
	    break;	    
	}
	
    case 63:
    case 64:
	{
	    int x1,y1,x2,y2;
	    double dist;
	        
	    save();
	    
	    QPen pen(Qt::SolidLine);
	    pen.setColor(cl);
	    setPen(pen);
	    
	    a.point(0,&x1,&y1);
	    for(int i=1;i<a.size();i++)
	    {
		a.point(i,&x2,&y2);
		if( (x1==x2)&&(y1==y2) )
		    continue;

		dist = sqrt( (x2-x1)*(x2-x1)+(y2-y1)*(y2-y1) );
		if(dist<2)
		    continue;  //距离太短 ,舍去这一点
		if( !lineInPaintRect(x1,y1,x2,y2,pRect) )
		{
			x1= x2;
			y1= y2;
			continue;
		}		

		LineBox lnBox;
		getLineBox(x1,y1,x2,y2,lnBox);
		//getLineBox(ax,ay,bx,by,lnBox);
		drawLine(lnBox.leftStart,lnBox.leftEnd);
		drawLine(lnBox.rightStart,lnBox.rightEnd);

		x1= x2;
		y1= y2;
	    }
	    
	 restore();   
	 break;
	}
    case 73:
    case 74:
    case 75:
    case 76:
    case 77:
	{
	 int x1,y1,x2,y2;
	 bool bBlack = TRUE;
	 int  space = 40;
	 int  lastDrwLength = space;
	 save();
	 
	 
	 a.point(0,&x1,&y1);
	 for(int i=1;i<a.size();i++)
	 {
	     a.point(i,&x2,&y2);
	     if( (x1==x2)&&(y1==y2) )
		 continue;

	     double dist = sqrt( (x2-x1)*(x2-x1)+(y2-y1)*(y2-y1) );
	     if(dist<2)
		 continue;

	     LineBox lnBox;
	     getLineBox(x1,y1,x2,y2,lnBox);

	     int px0,py0;
	     px0 = x1;
	     py0 = y1;   
	     int offset =0;	  
	     if(lastDrwLength!=space)
	     {
		 if(bBlack)
		 {
		     QPen pen(QColor("black"),3);
		     setPen(pen);
		 }
		 else
		 {
		     QPen pen(QColor("white"),3);
		     setPen(pen);
		 }
		 if(dist>space-lastDrwLength)
		 {
		     int px,py;
		     px = int(x1 +(space-lastDrwLength)*(x2-x1)/dist);
		     py = int(y1 +(space-lastDrwLength)*(y2-y1)/dist);
		     drawLine(x1,y1,px,py);
		     offset = space-lastDrwLength;    
		     px0 = px;
		     py0 = py;
		     lastDrwLength = space;
		     bBlack = !bBlack;
		 }
		 else
		 { 
		     drawLine(x1,y1,x2,y2);
		     lastDrwLength +=dist;
		     offset = dist;
		     
		 }
		 
	     }

	     int count = int((dist-offset)/space);
	     for(int i=1;i<=count;i++)
	     {
		 int px,py;
		 px = int(x1 +(offset+i*space)*(x2-x1)/dist);
		 py = int(y1 +(offset+i*space)*(y2-y1)/dist);
		 if(bBlack)
		 {
		     QPen pen(QColor("black"),3);
		     setPen(pen);
		 }
		 else
		 {
		     QPen pen(QColor("white"),3);
		     setPen(pen);
		 }
		 
		 drawLine(px0,py0,px,py);
		 px0 = px;
		 py0 = py;
		 lastDrwLength = space;
		 bBlack = !bBlack;
	     }
	     int lastLen = int(dist-offset-count*space);
	     if(lastLen>0)
	     {
		 if(bBlack)
		 {
		     QPen pen(QColor("black"),3);
		     setPen(pen);
		 }
		 else
		 {
		     QPen pen(QColor("white"),3);
		     setPen(pen);
		 }
		 drawLine(px0,py0,x2,y2);
		 lastDrwLength = lastLen;
	     }
	     
	     QPen pen(QColor("black"),0);
	     setPen(pen);
	     drawLine(lnBox.leftStart,lnBox.leftEnd);
	     drawLine(lnBox.rightStart,lnBox.rightEnd);
	  
	     x1= x2;
	     y1= y2;
	 }
	 restore();
	 break;
        }

    default: //默认的用2号线型	
	{
	    save();
	    QPen pen(Qt::SolidLine);
	    pen.setColor(cl);
	    setPen(pen);
	    	 
	    int x1,y1,x2,y2;
	    a.point(0,&x1,&y1);
	    for(int i=1;i<a.size();i++)
	    {
		a.point(i,&x2,&y2);
		if( (x1==x2)&&(y1==y2) )
		    continue;
		if( lineInPaintRect(x1,y1,x2,y2,pRect) )
		{
			drawLine(x1,y1,x2,y2);
		}
		
		x1= x2;
		y1= y2;
	    }   
	    restore();
	    break;	    
	}
    }

    
}