www.pudn.com > OSDemo.rar > PieChartCtrl.cpp
// PieChartCtrl.cpp : implementation file
//
// Written by Yuheng Zhao (yuheng@ministars.com)
// Copyright (c) 1998.
//
// This code may be used in compiled form in any way you desire. This
// file may be redistributed unmodified by any means PROVIDING it is
// not sold for profit without the authors written consent, and
// providing that this notice and the authors name is included. If
// the source code in this file is used in any commercial application
// then a simple email would be nice.
//
// This file is provided "as is" with no expressed or implied warranty.
// The author accepts no liability if it causes any damage whatsoever.
// It's free - so you get what you pay for.
#include "stdafx.h"
#include "PieChartCtrl.h"
#include
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
const double pi = 3.1415926535;
/////////////////////////////////////////////////////////////////////////////
// CPieChartCtrl
CPieChartCtrl::CPieChartCtrl()
{
CPieChartCtrl::RegisterWndClass(AfxGetInstanceHandle());
m_nStartAngle = 0;
m_colorLine = RGB(0,0,0);
m_colorDefault = RGB(0,0,255);
m_rectChart.SetRect(0,0,0,0);
m_bCaptured = FALSE;
m_strTitle = _T("");
m_fontTitle.CreateFont(15, 0,0,0,FW_NORMAL, 0,0,0,
DEFAULT_CHARSET, OUT_CHARACTER_PRECIS, CLIP_CHARACTER_PRECIS,
DEFAULT_QUALITY, DEFAULT_PITCH | FF_DONTCARE, "Arial");
m_fontInfo.CreateFont(13, 0,0,0,FW_NORMAL, 0,0,0,
DEFAULT_CHARSET, OUT_CHARACTER_PRECIS, CLIP_CHARACTER_PRECIS,
DEFAULT_QUALITY, DEFAULT_PITCH | FF_DONTCARE, "Arial");
}
CPieChartCtrl::~CPieChartCtrl()
{
Reset();
}
BEGIN_MESSAGE_MAP(CPieChartCtrl, CWnd)
//{{AFX_MSG_MAP(CPieChartCtrl)
ON_WM_PAINT()
ON_WM_LBUTTONUP()
ON_WM_LBUTTONDOWN()
ON_WM_MOUSEMOVE()
ON_WM_SIZE()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CPieChartCtrl message handlers
BOOL CPieChartCtrl::RegisterWndClass(HINSTANCE hInstance)
{
WNDCLASS wc;
wc.lpszClassName = "PIE_CHART_CTRL"; // matches class name in client
wc.hInstance = hInstance;
wc.lpfnWndProc = ::DefWindowProc;
wc.hCursor = ::LoadCursor(NULL, IDC_CROSS);
wc.hIcon = 0;
wc.lpszMenuName = NULL;
wc.hbrBackground = (HBRUSH) ::GetStockObject(LTGRAY_BRUSH);
wc.style = CS_GLOBALCLASS; // To be modified
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
return (::RegisterClass(&wc) != 0);
}
void CPieChartCtrl::OnPaint()
{
if (m_rectChart.IsRectEmpty()) // First Time
RecalcRect();
CPaintDC dc(this); // device context for painting
CRect clientRect;
GetClientRect(&clientRect);
CBitmap *pOldMemDCBitmap = NULL;
CDC memDC;
CBitmap bitmap;
memDC.CreateCompatibleDC(&dc);
bitmap.CreateCompatibleBitmap( &dc, clientRect.Width(), clientRect.Height() );
CBitmap *pOldmemDCBitmap = (CBitmap*)memDC.SelectObject(&bitmap);
//memDC.FillSolidRect(clientRect, GetSysColor(COLOR_3DFACE));
memDC.FillSolidRect(clientRect, RGB(214,223,247));
CPen pen;
pen.CreatePen(PS_SOLID, 1, m_colorLine);
CPen* pOldPen = (CPen*)memDC.SelectStockObject(NULL_PEN);
CBrush brush;
brush.CreateSolidBrush(m_colorDefault);
CBrush* pOldBrush = memDC.SelectObject(&brush);
memDC.Ellipse(m_rectChart);
int nCount = m_chartPieces.GetSize();
CPieChartPiece* pItem;
CPoint pt1, pt2;
int nCurrectAngle = m_nStartAngle;
int nInfo=0;
CountPoint(nCurrectAngle, pt1);
for (int i=0; im_nAngle;
CountPoint(nCurrectAngle, pt2);
memDC.SelectStockObject(NULL_PEN);
memDC.SelectObject(&pItem->m_brushBack);
if (pt2!=pt1)
memDC.Pie(m_rectChart, pt2, pt1);
//Draw line
memDC.SelectObject(&pen);
memDC.MoveTo(pt1);
memDC.LineTo(m_rectChart.CenterPoint());
memDC.LineTo(pt2);
//Draw info
CFont* pOldFont = memDC.SelectObject(&m_fontInfo);
memDC.SetBkMode(TRANSPARENT);
if (!(pItem->m_strInfo).IsEmpty())
{
CSize sz = memDC.GetTextExtent(pItem->m_strInfo);
CRect rcColor(clientRect);
rcColor.left = rcColor.right - sz.cy;
rcColor.bottom = rcColor.top + sz.cy;
rcColor.OffsetRect(0, nInfo*rcColor.Height());//+m_nTitleHeight);
memDC.FillSolidRect(rcColor, pItem->m_colorBack); // i must be less than MAX_COLOR
memDC.DrawEdge(rcColor, EDGE_SUNKEN, BF_RECT);
memDC.SetTextColor(GetSysColor(COLOR_WINDOWTEXT));
rcColor.right = rcColor.left - 3;
rcColor.left = clientRect.left;
memDC.DrawText(pItem->m_strInfo, rcColor, DT_RIGHT|DT_VCENTER);
nInfo++;
}
// Draw percent
if (pItem->m_nAngle>25)
{
int n = nCurrectAngle - (pItem->m_nAngle)/2;
CPoint p;
CountPoint(n, p, TRUE);
CString str;
str.Format("%.0f%%", (double)(pItem->m_nAngle)*100.0/360.0);
CSize sz = memDC.GetTextExtent(str);
memDC.SetTextColor(pItem->m_colorText);
memDC.TextOut(p.x-sz.cx/2, p.y-sz.cy/2, str);
}
memDC.SelectObject(pOldFont);
pt1 = pt2;
}
// Draw Line for the out circle
memDC.SelectObject(&pen);
memDC.SelectStockObject(NULL_BRUSH);
memDC.Ellipse(m_rectChart);
//Draw Title
if (!m_strTitle.IsEmpty())
{
CFont* pOldFont = memDC.SelectObject(&m_fontTitle);
memDC.SetTextColor(GetSysColor(COLOR_WINDOWTEXT));
memDC.SetBkMode(TRANSPARENT);
memDC.TextOut(1, 1, m_strTitle);
memDC.SelectObject(pOldFont);
}
dc.BitBlt( 0, 0, clientRect.Width(), clientRect.Height(),
&memDC, 0, 0, SRCCOPY );
memDC.SelectObject(pOldPen);
memDC.SelectObject(&pOldBrush);
memDC.SelectObject(pOldmemDCBitmap);
}
void CPieChartCtrl::OnLButtonUp(UINT, CPoint)
{
if (m_bCaptured)
{
::ReleaseCapture();
m_bCaptured = FALSE;
}
}
void CPieChartCtrl::OnLButtonDown(UINT, CPoint point)
{
SetCapture();
m_bCaptured = TRUE;
m_ptOldPt = point;
}
void CPieChartCtrl::OnMouseMove(UINT, CPoint point)
{
if (m_bCaptured)
{
int nOffX = point.x - m_ptOldPt.x;
m_nStartAngle += nOffX;
InvalidateRect(m_rectChart, FALSE);
m_ptOldPt = point;
}
}
void CPieChartCtrl::OnSize(UINT nType, int cx, int cy)
{
CWnd::OnSize(nType, cx, cy);
RecalcRect();
}
void CPieChartCtrl::RecalcRect()
{
CRect rect;
GetClientRect(&rect);
if (!m_strTitle.IsEmpty())
{
CClientDC dc(this);
CFont* pOldFont = dc.SelectObject(&m_fontTitle);
CSize sz = dc.GetTextExtent(m_strTitle);
m_nTitleHeight = sz.cy;
rect.top += sz.cy*2;// Leave lines.
dc.SelectObject(pOldFont);
}
int nSize = (rect.Width()>rect.Height())?rect.Height():rect.Width();
m_rectChart = CRect(CPoint(rect.left + (rect.Width()-nSize)/2,
rect.top + (rect.Height()-nSize)),
CSize(nSize, nSize));
}
BOOL CPieChartCtrl::AddPiece(COLORREF colorBack, COLORREF colorText,
int nAngle, const CString& str)
{
CPieChartPiece* pItem = new CPieChartPiece;
pItem -> m_colorBack = colorBack;
pItem -> m_colorText = colorText;
pItem -> m_brushBack.CreateSolidBrush(colorBack);
pItem -> m_nAngle = nAngle;
pItem -> m_strInfo = str;
try
{
m_chartPieces.Add(pItem);
InvalidateRect(NULL, FALSE);
return TRUE;
}
catch (CMemoryException* e)
{
if (pItem !=NULL)
delete pItem;
e->Delete();
return FALSE;
}
}
// bPercent is TRUE when counting the position for the percent info
void CPieChartCtrl::CountPoint(int nAngle, CPoint & pt, BOOL bPercent)
{
while (nAngle <0)
nAngle += 360;
while (nAngle>359)
nAngle -= 360;
double dAngle = ((double)nAngle)*pi/(double)180;
double r;
r = ((double)m_rectChart.Height())/2.0;
if (bPercent)
r = r*3.0/5.0;
double dOffX = (r*sin(dAngle));
double dOffY = 0.0 - (r*cos(dAngle));
double dX = ((double)(m_rectChart.right+m_rectChart.left))/2.0;
double dY = ((double)(m_rectChart.top+m_rectChart.bottom))/2.0;
pt.x = (int)(dX + dOffX);
pt.y = (int)(dY + dOffY);
}
void CPieChartCtrl::Reset()
{
int nCount = m_chartPieces.GetSize();
for (int i = 0; i < nCount; i++)
delete m_chartPieces.GetAt(i);
m_chartPieces.RemoveAll();
}
void CPieChartCtrl::GetItemColor(int i, COLORREF& color)
{
int nCount = m_chartPieces.GetSize();
if (i>=nCount)
i=nCount-1;
color = (m_chartPieces.GetAt(i))->m_colorBack;
}
void CPieChartCtrl::SetTitle(const CString & str)
{
m_strTitle = str;
RecalcRect();
InvalidateRect(NULL, FALSE);
}