pie.h

图像编程的参考资料

#if !defined(__PIE_H__)
#define __PIE_H__

#include "BarLine.h"
#include <string>
using namespace std;

template <class T> 
class CPie : public CBarLine<T>
{
public:
    void CutPie(T percentvalues[], int numvalues, string *labels, bool offsetflag = true);
	void CutPie3D(T percentvalues[], int numvalues, string *labels, bool offsetflag = true){ ; }
protected:
	virtual void Legend(COLORREF cr, int Index, const char* Name);
	void PieceOfPie(double x, double y, double radius, double showpercentage,
		            double AngleS, double AngleE, bool offsetflag);
};

template <class T> 
void CPie<T>::CutPie(T percentvalues[], int numvalues, string* labels, bool offsetflag)
{
    double x, y, radius;

	double* sum = new double[numvalues + 1];
    sum[0] = 0.0;              
    for(int i = 0; i<numvalues; i++)
		sum[i+1] = sum[i] + percentvalues[i];

    x = PX / 2.;
    y = PY / 2.; 
    radius = ((x > y) ? y : x) * 0.8; 
	x = (GL + GR) / 2. - m_lM;
    y = (GT + GB + m_bM) / 2.; 
    HBRUSH  hBrush, hBrold;
	double offset = 2*3.14159*(sum[0]/sum[numvalues] + sum[1]/sum[numvalues]) / 2; 
	m_LogFont.lfHeight = (int)(m_Size.cx / -30.0);
	if (m_LogFont.lfHeight > -10) m_LogFont.lfHeight = -10;
	m_LogFont.lfWeight     = 500;
	m_LogFont.lfOrientation= 0;
	m_LogFont.lfEscapement = 0;
	m_Font = ::CreateFontIndirect(&m_LogFont);
	if (m_Font)
	{
		HFONT hOldFont = (HFONT)::SelectObject(m_hDC, m_Font);
		int bm = ::SetBkMode(m_hDC, TRANSPARENT);
		for(i = 0; i<numvalues; i++)
		{    
			hBrush = ::CreateSolidBrush(crTable[i + 1]);
			hBrold = (HBRUSH)::SelectObject(m_hDC, hBrush);
			::SetTextColor(m_hDC, crTable[i + 1] );          
			double AngleS = 2*3.14159*sum[i]/sum[numvalues] - offset;
			double AngleE = 2*3.14159*sum[i+1]/sum[numvalues] - offset;
			
			PieceOfPie(x, y, radius, 100 * percentvalues[i] / sum[numvalues],
					   AngleS, AngleE, offsetflag);

			if (m_bEnableLegend)
				Legend(crTable[i + 1], i + 1, labels[i].c_str());

			::SelectObject(m_hDC, hBrold);
			::DeleteObject(hBrush);
		}         
		::SetBkMode(m_hDC, bm);
		::SelectObject(m_hDC, hOldFont);
		::DeleteObject(m_Font);
	}
	delete []sum;
}

template <class T> 
void CPie<T>::PieceOfPie(double x, double y, double radius, double showpercentage,
		                 double AngleS, double AngleE, bool offsetflag)
{
    int xoffset, yoffset;
    double labelloc, lradius;
    char buffer[10];                     
    const double PIE_OFFSET = m_Size.cx / 20.;

    //Offset lable radius by a factor of 1.2. This value
    //is dependent on the size of charaters you are using.
    if( offsetflag )
      lradius = radius * 1.15;
    else
      lradius = radius * 1.1; 
    labelloc = ( AngleS+AngleE ) / 2;
    int x1 = (int)(x-radius);
    int y1 = (int)(y-radius);
    int x2 = (int)(x+radius);
    int y2 = (int)(y+radius);
    int x3 = (int)(x+radius*cos(AngleS));
    int y3 = (int)(y-radius*sin(AngleS));
    int x4 = (int)(x+radius*cos(AngleE));
    int y4 = (int)(y-radius*sin(AngleE));
    if(offsetflag)
      {
        xoffset = (int)(cos(labelloc)*PIE_OFFSET);
        yoffset = (int)(sin(labelloc)*PIE_OFFSET);
		Pie(m_hDC, x1+xoffset, y1-yoffset, x2+xoffset, y2-yoffset,
            x3+xoffset, y3-yoffset, x4+xoffset, y4-yoffset);
      }
    else 
      Pie(m_hDC, x1, y1, x2, y2, x3, y3, x4, y4 );
 
	x += cos(labelloc) * lradius;
    y -= sin(labelloc) * lradius;
	labelloc = labelloc / PiV / 2;
    //Set text justification depending upon location of pieslice
    if(labelloc >= 5./6 || labelloc < 1./6)
      SetStringAlign(LEFT, CENTER);
    else if(labelloc >= 1./6 && labelloc < 1./3)
      SetStringAlign(CENTER, BOTTOM);
    else if(labelloc >= 1./3 && labelloc <2./3)
      SetStringAlign(RIGHT, CENTER);
    else
      SetStringAlign(CENTER, TOP);
    sprintf(buffer, "%3.lf%%", showpercentage);
    PrintString((int)x, (int)y, 0, buffer);
}

template<class T>
void CPie<T>::Legend(COLORREF cr, int Index, const char* Name)
{
	int n  = (m_Rect.right - GR) / 20 + 1;
	int xb = GR - m_rM / 2;
	int xe = GR;
	int y  = GT - 3 * Index * m_LogFont.lfHeight / 2;
	int y1 = y + m_LogFont.lfHeight / 3;
	int y2 = y - m_LogFont.lfHeight / 3;
	::Rectangle(m_hDC, xb, y1, xe, y2);
	::SetTextColor(m_hDC, cr); 
	int bm  = ::SetBkMode(m_hDC, TRANSPARENT);
	SetStringAlign(LEFT, CENTER);
	PrintString(xe + n, y, 0, Name);
	::SetBkMode(m_hDC, bm);
}

#endif