点状符号数据导出与绘制__GIS动力站_GisPower.org_Arcgis|SuperMap|Mapinfo|Mapgis|Erdas|Envi

1) 颜色。Pen 和Brush 中颜色的记录方法不是通常直接的RGB 颜色，需要进行转换。如Brush 中的参数16711680 对应蓝色，是在得到此数字后，将此十进制数据转换成十六进制字串FF0000 ，因为FF 对应着十进制数字255 ，00 依旧是十进制数字00 ，所以此字串对应着颜色BGR （255,0,0 ），与平时使用的RGB 颜色的顺序刚好相反。

2) Y 轴的起点和方向，导出的文件数据中记录的Y 轴起点在左上角，方向朝下，与某些系统中采用的Y 轴起点在左下角，方向朝上是不同，所以处理时候采用变换：ynew = L – yold.

3) ARC 的数据结构。导出的文件Arc 部分，往往记录着四组XY 顶点对，第一和第二顶点对表示要提取的椭圆弧的起点和终点，以逆时针方向为准。第三和第四顶点对表示椭圆的长短轴端点，以此可确定椭圆的参数。

附参考代码:

void ExportSuperSymbol::AddSuperMapPolygon(Vertex2dVector &PtList,COLORREF crPen,COLORREF crBrush)
{
m_iPolygonNumbers = m_iPolygonNumbers + 1;
m_geoAtomPolygon =(geoatom::CGeoAtomPolygon**)realloc(m_geoAtomPolygon,m_iPolygonNumbers*sizeof(geoatom::CGeoAtomPolygon*));
m_geoAtomPolygon[m_iPolygonNumbers-1] = new geoatom::CGeoAtomPolygon(); //原子分配内存，由于数组从0开始记数，标记总是比个数少1

for (int m=0;m<PtList.size();m++)
{
m_geoAtomPolygon[m_iPolygonNumbers-1]->GetPtList()->add(m_fXaddition+m_iSize*PtList.get(m).x,m_fYaddition+m_fLength-m_iSize*PtList.get(m).y);
}
m_geoAtomPolygon[m_iPolygonNumbers-1]->SetColor(crPen);
m_geoAtomPolygon[m_iPolygonNumbers-1]->SetFilledColor(crBrush);
m_geoSymPoint[m_iPointSymbolNum-1]->AddAtom(m_geoAtomPolygon[m_iPolygonNumbers-1]); //将封闭区要素添加到这个符号中

}

void ExportSuperSymbol::AddSuperMapRectangle(double dLeftTopX,double dLeftTopY,double dRightBottomX,double dRightBottomY,COLORREF crPen,COLORREF crBrush)
{
///为填充的Rectangle
m_iPolygonNumbers = m_iPolygonNumbers + 1; //矩形属于Polygon一种
m_geoAtomPolygon =(geoatom::CGeoAtomPolygon**)realloc(m_geoAtomPolygon,m_iPolygonNumbers*sizeof(geoatom::CGeoAtomPolygon*));
m_geoAtomPolygon[m_iPolygonNumbers-1] = new geoatom::CGeoAtomPolygon(); //原子分配内存，由于数组从0开始记数，标记总是比个数少1

//矩形的四个顶点
m_geoAtomPolygon[m_iPolygonNumbers-1]->GetPtList()->add(m_fXaddition+m_iSize*dLeftTopX,m_fYaddition+m_fLength-m_iSize*dLeftTopY);
m_geoAtomPolygon[m_iPolygonNumbers-1]->GetPtList()->add(m_fXaddition+m_iSize*dRightBottomX,m_fYaddition+m_fLength-m_iSize*dLeftTopY);
m_geoAtomPolygon[m_iPolygonNumbers-1]->GetPtList()->add(m_fXaddition+m_iSize*dRightBottomX,m_fYaddition+m_fLength-m_iSize*dRightBottomY);
m_geoAtomPolygon[m_iPolygonNumbers-1]->GetPtList()->add(m_fXaddition+m_iSize*dLeftTopX,m_fYaddition+m_fLength-m_iSize*dRightBottomY);

m_geoAtomPolygon[m_iPolygonNumbers-1]->SetColor(crPen);
m_geoAtomPolygon[m_iPolygonNumbers-1]->SetFilledColor(crBrush);
m_geoSymPoint[m_iPointSymbolNum-1]->AddAtom(m_geoAtomPolygon[m_iPolygonNumbers-1]); //将封闭区要素添加到这个符号中
}

void ExportSuperSymbol::AddSuperMapEllipse(double dFirstX,double dFirstY,double dSecondX,double dSecondY,double dMajorRadio,double dMinorRadio,COLORREF crPen,COLORREF crBrush)
{
m_iEllipseNumbers = m_iEllipseNumbers + 1;
m_geoAtomEllipse = (geoatom::CGeoAtomEllipse**)realloc(m_geoAtomEllipse,m_iEllipseNumbers*sizeof(geoatom::CGeoAtomEllipse));
m_geoAtomEllipse[m_iEllipseNumbers-1] = new geoatom::CGeoAtomEllipse();

double dCenterX=0; //圆心的位置
double dCenterY=0;

if(dFirstX<dSecondX&&dFirstY<dSecondY)
{
  dCenterX = dFirstX+abs(dSecondX - dFirstX)/2;    //圆心的位置
  dCenterY = dFirstY+abs(dSecondY - dFirstY)/2;
}
else if(dFirstX<dSecondX&&dFirstY>dSecondY)
{
  dCenterX = dFirstX+abs(dSecondX - dFirstX)/2;    //圆心的位置
  dCenterY = dSecondY+abs(dSecondY - dFirstY)/2;
}
else if(dFirstX>dSecondX&&dFirstY<dSecondY)
{
  dCenterX = dSecondX+abs(dSecondX - dFirstX)/2;    //圆心的位置
  dCenterY = dFirstY+abs(dSecondY - dFirstY)/2;
}
else
{
  dCenterX = dSecondX+abs(dSecondX - dFirstX)/2;    //圆心的位置
  dCenterY = dSecondY+abs(dSecondY - dFirstY)/2;
}

m_geoAtomEllipse[m_iEllipseNumbers-1]->SetCenterPoint(m_fXaddition+m_iSize*dCenterX,m_fYaddition+m_fLength-m_iSize*dCenterY);
m_geoAtomEllipse[m_iEllipseNumbers-1]->SetMajorAxis(dMajorRadio*m_iSize);
m_geoAtomEllipse[m_iEllipseNumbers-1]->SetMinorAxis(dMinorRadio*m_iSize);
m_geoAtomEllipse[m_iEllipseNumbers-1]->SetStartAngleRad(0.0);
m_geoAtomEllipse[m_iEllipseNumbers-1]->SetEndAngleRad(6.2832); //360角度与弧度的换算

m_geoAtomEllipse[m_iEllipseNumbers-1]->SetColor(crPen);
m_geoAtomEllipse[m_iEllipseNumbers-1]->SetFilled(true); //要求填充
m_geoAtomEllipse[m_iEllipseNumbers-1]->SetFilledColor(crBrush);
m_geoSymPoint[m_iPointSymbolNum-1]->AddAtom(m_geoAtomEllipse[m_iEllipseNumbers-1]);
}

void ExportSuperSymbol::AddSuperMapArc(double dFirstX,double dFirstY,double dSecondX,double dSecondY,double dThirdX,double dThirdY,double dFourthX,double dFourthY,COLORREF crPen)
{
double dCenterX = 0;
double dCenterY = 0;
if(abs(dFirstX-dThirdX)<0.00001&&abs(dFirstY-dThirdY)<0.00001 && abs(dSecondX-dFourthX)<0.00001&&abs(dSecondY-dFourthY)<0.00001)
{    //此椭圆特殊化为四分只一
  m_iEllipseNumbers = m_iEllipseNumbers + 1;
  m_geoAtomEllipse = (geoatom::CGeoAtomEllipse**)realloc(m_geoAtomEllipse,m_iEllipseNumbers*sizeof(geoatom::CGeoAtomEllipse));
  m_geoAtomEllipse[m_iEllipseNumbers-1] = new geoatom::CGeoAtomEllipse();

  if(dFirstX>dSecondX)          //分情况讨论，好比四个象限
  {
   if(dFirstY>dSecondY)
   {
    m_geoAtomEllipse[m_iEllipseNumbers-1]->SetStartAngleRad(0);  //0角度与弧度的换算,注意圆的旋转方向是逆或顺时针
    m_geoAtomEllipse[m_iEllipseNumbers-1]->SetEndAngleRad(1.5708);   //90角度与弧度的换算
    dCenterX = dSecondX;         //取第二个点的X数值
    dCenterY = dFirstY;          //取较大Y数值
   }
   else
   {
    m_geoAtomEllipse[m_iEllipseNumbers-1]->SetStartAngleRad(1.5708);  //90角度与弧度的换算,注意圆的旋转方向是逆或顺时针
    m_geoAtomEllipse[m_iEllipseNumbers-1]->SetEndAngleRad(3.1416);   //180角度与弧度的换算
    dCenterX = dFirstX;         //取第一个点的X数值
    dCenterY = dSecondY;         //取较大Y数值
   }
  }
  else
  {
   if(dFirstY<dSecondY)
   {
    m_geoAtomEllipse[m_iEllipseNumbers-1]->SetStartAngleRad(3.1416);  //180角度与弧度的换算,注意圆的旋转方向是逆或顺时针
    m_geoAtomEllipse[m_iEllipseNumbers-1]->SetEndAngleRad(4.7124);   //270角度与弧度的换算
    dCenterX = dSecondX;
    dCenterY = dFirstY;             //取较小Y数值
   }
   else
   {
    m_geoAtomEllipse[m_iEllipseNumbers-1]->SetStartAngleRad(4.7124);  //270角度与弧度的换算,注意圆的旋转方向是逆或顺时针
    m_geoAtomEllipse[m_iEllipseNumbers-1]->SetEndAngleRad(6.2832);   //360角度与弧度的换算
    dCenterX = dFirstX;
    dCenterY = dSecondY;            //取较小Y数值
   }
  }
  double dMajorRadio = 0;
  double dMinorRadio = 0;
  dMajorRadio = abs(dSecondX - dFirstX);    //得到半径
  dMinorRadio = abs(dSecondY - dFirstY);

  m_geoSymPoint[m_iPointSymbolNum-1]->AddAtom(m_geoAtomEllipse[m_iEllipseNumbers-1]);
}
else
{        //给出长短轴端点和起终点的情况
  m_iEllipseNumbers = m_iEllipseNumbers + 1;
  m_geoAtomEllipse = (geoatom::CGeoAtomEllipse**)realloc(m_geoAtomEllipse,m_iEllipseNumbers*sizeof(geoatom::CGeoAtomEllipse));
  m_geoAtomEllipse[m_iEllipseNumbers-1] = new geoatom::CGeoAtomEllipse();

  double dAngleStart = 0;
  double dAngleEnd = 3.1416;    //单位为弧度，在函数库中角度均以弧度来表示

  if(dFirstX>dSecondX)     //比较起始点
  {
   if(dThirdX<dFourthX)
   {
    dCenterX = dFourthX;   //得到椭圆的中心
    dCenterY = dThirdY;

dAngleStart = atan((dFirstY - dCenterY)/(dFirstX - dCenterX));
dAngleEnd = atan((dSecondY - dCenterY)/(dSecondX - dCenterX));

   }
   else if(dThirdX>dFourthX&&dThirdY<dFourthY)
   {
    dCenterX = dThirdX;
    dCenterY = dFourthY;

dAngleStart = atan((dFirstY - dCenterY)/(dFirstX - dCenterX));
dAngleEnd = atan((dSecondY - dCenterY)/(dSecondX - dCenterX));

if(dFirstX>dCenterX&&dFirstY<dCenterY) dAngleStart = -dAngleStart;

if(dFirstX == dCenterX) dAngleStart = 1.5708;
if(dFirstX<dCenterX&&dFirstY<dCenterY) dAngleStart = -dAngleStart + 3.1416;

    if(dSecondX<dCenterX&&dSecondY>dCenterY) dAngleEnd = -dAngleEnd + 3.1416;
    if(dSecondX<dCenterX&&dSecondY<=dCenterY) dAngleEnd = -dAngleEnd+3.1416;
    if(dSecondX==dCenterX) dAngleStart = 3.1416;
   }
   else if(dThirdX>dFourthX&&dThirdY>dFourthY)
   {
    dCenterX = dFourthX;
    dCenterY = dThirdY;

dAngleStart = atan((dFirstY - dCenterY)/(dFirstX - dCenterX));
dAngleEnd = atan((dSecondY - dCenterY)/(dSecondX - dCenterX));

if(dFirstX>=dCenterX&&dFirstY<dCenterY) dAngleStart = -dAngleStart;
if(dSecondX<dCenterX&&dSecondY<dCenterY) dAngleEnd = -dAngleEnd+3.1416;

   }
   else
   {
    dCenterX = dThirdX;
    dCenterY = dFourthY;

dAngleStart = atan((dFirstY - dCenterY)/(dFirstX - dCenterX));
dAngleEnd = atan((dSecondY - dCenterY)/(dSecondX - dCenterX));

}

  }
  else          //dFirstX<dSecondX
  {

   if(dThirdX<dFourthX&&dThirdY>dFourthY)
   {
    dCenterX = dThirdX;
    dCenterY = dFourthY;

dAngleStart = atan((dFirstY - dCenterY)/(dFirstX - dCenterX)); //返回的结果在-1.5708与1.5708之间
dAngleEnd = atan((dSecondY - dCenterY)/(dSecondX - dCenterX));

    if(dFirstX<dCenterX&&dFirstY>dCenterY) dAngleStart = -dAngleStart+3.1416;
    if(dSecondX>dCenterX&&dSecondY>dCenterY) dAngleEnd = - dAngleEnd + 6.2832;
   }
   else if(dThirdX<dFourthX&&dThirdY<dFourthY)
   {
    dCenterX = dFourthX;
    dCenterY = dThirdY;

dAngleStart = atan((dFirstY - dCenterY)/(dFirstX - dCenterX)); //返回的结果在-1.5708与1.5708之间
dAngleEnd = atan((dSecondY - dCenterY)/(dSecondX - dCenterX));

if(dFirstX<dCenterX&&dFirstY<dCenterY) dAngleStart = -dAngleStart+3.1416;
if(dSecondX>=dCenterX&&dSecondY>dCenterY) dAngleEnd = - dAngleEnd + 6.2832;

   }
   else if(dThirdX>dFourthX&&dThirdY<dFourthY)
   {
    dCenterX = dThirdX;
    dCenterY = dFourthY;

    dAngleStart = atan((dFirstY - dCenterY)/(dFirstX - dCenterX));
    dAngleEnd = atan((dSecondY - dCenterY)/(dSecondX - dCenterX));

    if(dFirstX<dCenterX&&dFirstY<dCenterY) dAngleStart = -dAngleStart+3.1416;
    if(dFirstX>dCenterX&&dFirstY<dCenterY) dAngleStart = -dAngleStart;
    if(dSecondX>dCenterX&&dSecondY>dCenterY) dAngleEnd = - dAngleEnd + 6.2832;
   }
   else
   {
    dCenterX = dFourthX;
    dCenterY = dThirdY;

    dAngleStart = atan((dFirstY - dCenterY)/(dFirstX - dCenterX));
    dAngleEnd = atan((dSecondY - dCenterY)/(dSecondX - dCenterX));
   }

}

  double dMajorRadio = abs(dThirdX - dFourthX);  //通过第三和第四个点求得
  double dMinorRadio = abs(dThirdY - dFourthY);
  m_geoAtomEllipse[m_iEllipseNumbers-1]->SetStartAngleRad(dAngleStart);
  m_geoAtomEllipse[m_iEllipseNumbers-1]->SetEndAngleRad(dAngleEnd);
  m_geoAtomEllipse[m_iEllipseNumbers-1]->SetCenterPoint(m_fXaddition+m_iSize*dCenterX,m_fYaddition+m_fLength-m_iSize*dCenterY);
  m_geoAtomEllipse[m_iEllipseNumbers-1]->SetMajorAxis(dMajorRadio*m_iSize);
  m_geoAtomEllipse[m_iEllipseNumbers-1]->SetMinorAxis(dMinorRadio*m_iSize);
  m_geoAtomEllipse[m_iEllipseNumbers-1]->SetColor(crPen);
  m_geoSymPoint[m_iPointSymbolNum-1]->AddAtom(m_geoAtomEllipse[m_iEllipseNumbers-1]);
}
}