GIS编程

开发平台：
Visual C++

Arc.cpp：源码内容
							// Arc.cpp: implementation of the CArc class.
//
//////////////////////////////////////////////////////////////////////
#include "stdafx.h"
//#include "Draw.h"
#include "Arc.h"
#include "math.h"
//#include "DrawDoc.h"
#define pi 3.1415926
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
extern IsRectCross(float minx,float miny,float maxx,float maxy);
//extern  CGraphPara *p_GraphPara;
//CArc::CArc();
//float xMinScreen,yMinScreen,xMaxScreen,yMaxScreen;
//BOOL IsRectCross(float minx,float miny,float maxx,float maxy);
//BOOL IsRectCross(float minx,float miny,float maxx,float maxy)
//{
//	if(minx>xMaxScreen||maxx<xMinScreen||miny>yMaxScreen||maxy<yMinScreen)
//		return FALSE;  //如两个矩形不相交
//	else
//		return TRUE;
//}
void CArc::Draw(CDC* pDC,int m_DrawMode,int m_DrawModel,short BackColor)
{
	if(b_Delete)
		return ;
	int x,y,rr;
	int x1,y1,x2,y2;
	float minx,miny,maxx,maxy;
	GetRect(&minx,&miny,&maxx,&maxy);//得到边界矩形
	if(!IsRectCross(minx,miny,maxx,maxy))//如果边界矩形不与屏幕窗口相交
		return;
	short LineType=m_LineType;
	short LineWide=max(1,DLtoVL(m_LineWide));
	short ColorPen=m_ColorPen;
	if(m_DrawModel==1)
	{
		if(m_LineType!=2)
			LineType=2;
		else
			LineType++;
	}
	else if(m_DrawModel==2)
		ColorPen=BackColor;
	CGraphPara m_GraphPara;
    CGraphPara *p_GraphPara;
	p_GraphPara=&m_GraphPara;
	CPen pen((int)LineType,(int)LineWide,p_GraphPara->GetColor(ColorPen));
	CPen* pOldPen=pDC->SelectObject(&pen);
	if(m_DrawMode==0)
		pDC->SetROP2(R2_COPYPEN);
	else if(m_DrawMode==1)
		pDC->SetROP2(R2_NOT);
	DPtoVP(m_CircleX,m_CircleY,&x,&y);
	rr=DLtoVL(m_CircleR);
	x1=(int)(x+(DLtoVL(m_CircleR*cos(m_Angle1))));
	y1=(int)(y-DLtoVL(m_CircleR*sin(m_Angle1)));
	x2=(int)(x+DLtoVL(m_CircleR*cos(m_Angle2)));
	y2=(int)(y-DLtoVL(m_CircleR*sin(m_Angle2)));
 //   Invalidate();
	pDC->Arc(x-rr,y-rr,x+rr,y+rr,x1,y1,x2,y2);
	pDC->SelectObject(pOldPen);
}
void CArc::GetRect(float* minX,float* minY,float* maxX,float* maxY)
{
	float x,y,x1,y1,x2,y2;
	int i,pb;
	//得到圆弧的起点坐标
	x=m_CircleX+(float)(cos(m_Angle1)*m_CircleR);
	y=m_CircleY+(float)(sin(m_Angle1)*m_CircleR);
	//用圆弧起点坐标来初始化边界矩形
	x1=x;y1=y;
	x2=x;y2=y;
	//得到圆弧的中终点坐标
	x=m_CircleX+(float)(cos(m_Angle2)*m_CircleR);
	y=m_CircleY+(float)(sin(m_Angle2)*m_CircleR);
	//得到最小和最大坐标
	x1=min(x,x1);x2=max(x,x2);
	y1=min(y,y1);y2=max(y,y2);
	for(i=0;i<4;i++)
	{
		if(IsInArc(pi/2*i))
		{
			if(i==0)
			{
				x=m_CircleX+m_CircleR;
				y=m_CircleY;
			}
			else if(i==1)
			{
				x=m_CircleX;
				y=m_CircleY+m_CircleR;
			}
			else if(i==2)
			{
				x=m_CircleX-m_CircleR;
				y=m_CircleY;
			}
			else if(i==3)
			{
				x=m_CircleX;
				y=m_CircleY-m_CircleR;
			}
			x1=min(x,x1);x2=max(x,x2);
			y1=min(y,y1);y2=max(y,y2);
		}
	}
	*minX=x1;*maxX=x2;*minY=y1;*maxY=y2;
}
void CArc::CalLong()
{
	float angle=m_Angle2;
	if(this->m_Angle2<this->m_Angle1)
		angle+=pi*2;
	CCircle::CalLong();
	m_fLong=m_fLong*(angle-m_Angle1)/(pi*2);
}
BOOL CArc::IsInArc(float angle)
{
	if((m_Angle1<m_Angle2&&angle<m_Angle2&&angle>=m_Angle1)||
		m_Angle1>m_Angle2&&(!(angle<=m_Angle1&&angle>=m_Angle2)))
		return TRUE;
	else
		return FALSE;
}
BOOL CArc::IsPoint(float x,float y,float j1,float blc)
{
	if(CCircle::IsPoint(x,y,j1,blc))//调用CCircle类的IsPoint函数判断是否选中了圆
	{
		float xx=CalDisp(x,y,m_CircleX,m_CircleY);
		float ang=(float)acos((x-m_CircleX)/xx);
		if(y-m_CircleY<0)
			ang=(float)pi*2-ang;
		if(IsInArc(ang))
			return TRUE;
	}
	return FALSE;
}
void CArc::Move(float x_Move,float y_Move)
{
	CCircle::Move(x_Move,y_Move);
}
void CArc::Rotate(float baseX,float baseY,float angle)
{
	RotatePoint(baseX,baseY,angle,&this->m_CircleX,&this->m_CircleY);
	this->m_Angle1+=angle;
	this->m_Angle2+=angle;
}
CArc::~CArc()
{
}

						