ugkcanvas.cpp

linux下一款GIS程序源码

/* ugkcanvas.cpp */

#include "ugkcanvas.h"
#include <qapplication.h>
#include "ugkpainter.h"
#include "KitSrc/ugkglobal.h"
#include "mainfrm.h"
#include <stdio.h>
#include <qmessagebox.h>
#include <qstatusbar.h> 
#include <qcursor.h> 

UGKCanvas::UGKCanvas(QWidget *parent,const char *name):
	QFrame(parent,name)
{
    m_Parent = parent;
    setBackgroundMode(NoBackground);
    setFrameStyle(Box | Raised);
    setLineWidth(2);
    setMidLineWidth(0);
   
    bSetLyrManagerRef = FALSE;
    m_LyrManagerRef= NULL;
    m_CurMapTool = MAPTOOL_Arrow;
    lastScreen = NULL;
    bLeftButtonPressed = FALSE;
    bReDraw  = TRUE; //第一次需要绘制背景
    bPainting  = FALSE;
    
    bMarkSym = FALSE;
    dlg = new MarkDlg(this,"Mark Dialog",TRUE);
    
}
/*
 *  Destroys the object and frees any allocated resources
 */

UGKCanvas::~UGKCanvas()
{
    if(lastScreen)
	delete lastScreen;
    if(dlg)
	delete dlg;
}

void UGKCanvas::setLayerManagerRef( GUI_Manager *mgrRef)
{
    if(mgrRef)
    {
	m_LyrManagerRef = mgrRef;
	bSetLyrManagerRef = TRUE;
    }
    else
    {
	m_LyrManagerRef =NULL;
	bSetLyrManagerRef = FALSE;
    }
}


void UGKCanvas::resizeEvent ( QResizeEvent * e )
{
    QFrame::resizeEvent(e);
    bReDraw = TRUE;
}

void UGKCanvas::paintEvent(QPaintEvent *e)
{  
    QFrame::paintEvent(e);
    if(bPainting)
	return;
    bPainting = TRUE;
    QCursor curWait(WaitCursor);
    setCursor(curWait);
    m_CurMapTool = MAPTOOL_Arrow;
        
    QRect ptrt=contentsRect();//得到组件尺寸
    //QRect ptrt=frameRect();//得到组件尺寸
    if(bReDraw)  //需要绘制
    {
	int top,left,pw,ph;
	top = ptrt.top();
	left = ptrt.left();
	pw = ptrt.width();
	ph = ptrt.height();
	QPixmap memDC(pw,ph,-1,QPixmap::DefaultOptim);//QPixmap::BestOptim 
	UGKPainter p(&memDC);
	p.setClipRect(0,0,pw,ph);
	//先绘制背景
	QBrush brush(white);
	p.fillRect(0,0,pw,ph,brush);
	
	if(bSetLyrManagerRef) //如果图层管理器设置了
	{
	    //printf("UGKCanvas__ Repaint\n");
	    m_LyrManagerRef->setPaintRect( 0,0,pw, ph );
	    m_LyrManagerRef->Draw( &memDC );
	}

	if(lastScreen)
	    delete lastScreen;
	lastScreen = new QPixmap(memDC);
	p.end();
	bitBlt(this,ptrt.left(),ptrt.top(),&memDC);
	bReDraw = FALSE;
    }
    else  
    {  //不需要重新绘制
	if(lastScreen)
	    bitBlt(this,ptrt.left(),ptrt.top(),lastScreen);
	if(bMarkSym)
	{
	    bMarkSym = FALSE; //只绘制一次,刷新后就没有了
	    QPixmap sym(markSymPath);
	    int sw,sh;
	    sw = sym.width();
	    sh = sym.height();
	    if( (sw==16)&&(sh==16) )
	    {
		UGKPainter p(lastScreen);
		p.drawPixmap(markSym_X-sw/2,markSym_Y-sh/2,sym);
		p.drawText(markSym_X-sw/2,markSym_Y-sh/2,markSymName);
		p.end();
	    }
	    	    
	}
    }

    bPainting = FALSE;
    QCursor curArrow(ArrowCursor);
    setCursor(curArrow);
  
}   


void UGKCanvas::mouseMoveEvent( QMouseEvent * e )
{

    movPt = e->pos();
    
    if(bLeftButtonPressed)
    {
	int sx = MIN(firPt.x(),movPt.x());
	int sy = MIN(firPt.y(),movPt.y());
	int sw = ABS(firPt.x()-movPt.x());
	int sh = ABS(firPt.y()-movPt.y());
	QRect ptrt=contentsRect();
	int pw,ph;
	pw = ptrt.width();
	ph = ptrt.height();
	QPixmap memDC(pw,ph,-1,QPixmap::DefaultOptim);
	UGKPainter pt(&memDC);
	QBrush brush(QColor("white"));
	pt.fillRect(0,0,pw,ph,brush);	
	
	QPen pen(QColor("black"),1,Qt::DotLine);
	pt.setPen(pen);
	
	switch(m_CurMapTool)
	{
	case MAPTOOL_ZoomIn:
	case MAPTOOL_ZoomOut:  
	    bitBlt(&memDC,0,0,lastScreen);
	    pt.drawRect(sx,sy,sw,sh);
	    bitBlt(this,ptrt.left(),ptrt.top(),&memDC);	    
	    break;
	case MAPTOOL_Pan:
	    bitBlt(&memDC,movPt.x()-firPt.x(),movPt.y()-firPt.y(),lastScreen);
	    bitBlt(this,ptrt.left(),ptrt.top(),&memDC);
	    break;
	case MAPTOOL_Arrow:
	case MAPTOOL_Label:
	    ;
	}
	
	pt.end();
    }
        

}

void UGKCanvas::mousePressEvent( QMouseEvent * e )
{

    firPt = e->pos();
    
    if(e->button()==Qt::LeftButton)
    {
	if((m_CurMapTool==MAPTOOL_ZoomIn)||
	   (m_CurMapTool==MAPTOOL_ZoomOut)||
	   (m_CurMapTool==MAPTOOL_Pan))
	    bLeftButtonPressed = TRUE;
	
    }
}

void UGKCanvas::mouseReleaseEvent( QMouseEvent *e)
{

    QStatusBar *statusbar=((mainfrm*)m_Parent)->m_StatusBar;
        
    secPt = e->pos();
    if(bLeftButtonPressed)
    {
	int sx = (firPt.x()+secPt.x())/2;
	int sy = (firPt.y()+secPt.y())/2;
	int sw = ABS(secPt.x()-firPt.x());
	int sh = ABS(secPt.y()-firPt.y());

	if((sw==0)&&(sh==0))
	{
	    bLeftButtonPressed = FALSE;
	    return;
	}
	
	QRect ptrt=contentsRect();
	if((m_CurMapTool==MAPTOOL_ZoomIn)||(m_CurMapTool==MAPTOOL_ZoomOut))	 
	    bitBlt(this,ptrt.left(),ptrt.top(),lastScreen);
	
      
       bLeftButtonPressed = FALSE;
       if(m_LyrManagerRef==NULL)
	   return;
       double oldViewX,oldViewY;
       double oldCenX,oldCenY;
       m_LyrManagerRef->getView(oldViewX,oldViewY);
       m_LyrManagerRef->getCenter(oldCenX,oldCenY);
       double newViewX,newViewY;
       double newCenX,newCenY;
       
       QString mess;
       switch(m_CurMapTool)
       {
       case MAPTOOL_Arrow:
       case MAPTOOL_Label:
	   break;
       case MAPTOOL_ZoomIn:
	   newViewX = oldViewX *sw/ptrt.width();
	   newViewY = oldViewY *sh/ptrt.height();

	   newCenX = oldCenX+oldViewX*( sx-(ptrt.left()+ptrt.width()/2) )/ptrt.width();
	   newCenY=  oldCenY-oldViewY*( sy-(ptrt.top()+ptrt.height()/2) )/ptrt.height();
	   
	   if((newViewX<0.05)||(newViewY<0.05))
	       return;
	   m_LyrManagerRef->setCenter(newCenX,newCenY);
	   m_LyrManagerRef->setView(newViewX,newViewY);
	   mess = QString(tr("X view:"))+QString::number(newViewX)+QString("  ")+
		  QString(tr("Y view:"))+QString::number(newViewY);
	   
	   statusbar->message(tr("Redrawing..."));
	   bReDraw = TRUE;
	   repaint(TRUE);
	   statusbar->message(mess);
	   break;
       case MAPTOOL_ZoomOut: 
	   newViewX = oldViewX *ptrt.width()/sw;
	   newViewY = oldViewY *ptrt.height()/sh;

	   newCenX = oldCenX+oldViewX*( sx-(ptrt.left()+ptrt.width()/2) )/ptrt.width();
	   newCenY = oldCenY-oldViewY*( sy-(ptrt.top()+ptrt.height()/2) )/ptrt.height();
	   if((newViewX<0.05)||(newViewY<0.05))
	       return;
	   
	   m_LyrManagerRef->setCenter(newCenX,newCenY);
	   m_LyrManagerRef->setView(newViewX,newViewY);
	   mess = QString(tr("X view:"))+QString::number(newViewX)+QString("  ")+
		  QString(tr("Y view:"))+QString::number(newViewY);
	   
	   statusbar->message(tr("Redrawing..."));
	   bReDraw = TRUE;
	   repaint(TRUE);
	   statusbar->message(mess);
	   break;
       case MAPTOOL_Pan:	   
	   newCenX = oldCenX-oldViewX*( secPt.x()-firPt.x())/ptrt.width();
	   newCenY=  oldCenY+oldViewY*( secPt.y()-firPt.y() )/ptrt.height();
	   m_LyrManagerRef->setCenter(newCenX,newCenY);
	   mess = QString(tr("X view:"))+QString::number(oldViewX)+QString("  ")+
		  QString(tr("Y view:"))+QString::number(oldViewY);
	   
	   statusbar->message(tr("Redrawing..."));
	   bReDraw = TRUE;
	   repaint(TRUE);
	   statusbar->message(mess);
	   break;
      
       }
   }
    
    
    if(m_CurMapTool==MAPTOOL_Label)
    {
	//弹出对话框,选择标记图形,然后绘制标记
	QString symPath=dlg->ModalShow();
	if(symPath.isNull())
	    return;
	else
	{
		markSymPath = symPath;
		markSymName = getBaseName(symPath);
		bMarkSym = TRUE;
		markSym_X = secPt.x();
		markSym_Y = secPt.y();
		repaint(TRUE);
		return;
	}
    }    
}