自制BUTTON类圆形按钮

// SButton.cpp : implementation file // #include "stdafx.h" #include "CSButtonDlg.h" #include "SButton.h" #include "math.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif //local functions COLORREF GetColour(double dAngle, COLORREF crBright, COLORREF crDark); void DrawCircle(CDC* pDC, CPoint p, LONG lRadius, COLORREF crColour, BOOL bDashed = FALSE); void DrawCircle(CDC* pDC, CPoint p, LONG lRadius, COLORREF crBright, COLORREF crDark); void DrawCircle(CDC* pDC, CPoint p, LONG lRadius, COLORREF crColour, BOOL bDashed) { const int nDashLength = 1; LONG lError, lXoffset, lYoffset; int nDash = 0; BOOL bDashOn = TRUE; //Check to see that the coordinates are valid ASSERT( (p.x + lRadius <= LONG_MAX) && (p.y + lRadius <= LONG_MAX) ); ASSERT( (p.x - lRadius >= LONG_MIN) && (p.y - lRadius >= LONG_MIN) ); //Set starting values lXoffset = lRadius; lYoffset = 0; lError = -lRadius; do { if (bDashOn) { pDC->SetPixelV(p.x + lXoffset, p.y + lYoffset, crColour); pDC->SetPixelV(p.x + lXoffset, p.y - lYoffset, crColour); pDC->SetPixelV(p.x + lYoffset, p.y + lXoffset, crColour); pDC->SetPixelV(p.x + lYoffset, p.y - lXoffset, crColour); pDC->SetPixelV(p.x - lYoffset, p.y + lXoffset, crColour); pDC->SetPixelV(p.x - lYoffset, p.y - lXoffset, crColour); pDC->SetPixelV(p.x - lXoffset, p.y + lYoffset, crColour); pDC->SetPixelV(p.x - lXoffset, p.y - lYoffset, crColour); } //Advance the error term and the constant X axis step lError += lYoffset++; //Check to see if error term has overflowed if ((lError += lYoffset) >= 0) lError -= --lXoffset * 2; if (bDashed && (++nDash == nDashLength)) { nDash = 0; bDashOn = !bDashOn; } } while (lYoffset <= lXoffset); //Continue until halfway point } void DrawCircle(CDC* pDC, CPoint p, LONG lRadius, COLORREF crBright, COLORREF crDark) { LONG lError, lXoffset, lYoffset; //Check to see that the coordinates are valid ASSERT( (p.x + lRadius <= LONG_MAX) && (p.y + lRadius <= LONG_MAX) ); ASSERT( (p.x - lRadius >= LONG_MIN) && (p.y - lRadius >= LONG_MIN) ); //Set starting values lXoffset = lRadius; lYoffset = 0; lError = -lRadius; do { const double Pi = 3.141592654, Pi_on_2 = Pi * 0.5, Three_Pi_on_2 = Pi * 1.5; COLORREF crColour; double dAngle = atan2(lYoffset, lXoffset); //Draw the current pixel, reflected across all eight arcs crColour = GetColour(dAngle, crBright, crDark); pDC->SetPixelV(p.x + lXoffset, p.y + lYoffset, crColour); crColour = GetColour(Pi_on_2 - dAngle, crBright, crDark); pDC->SetPixelV(p.x + lYoffset, p.y + lXoffset, crColour); crColour = GetColour(Pi_on_2 + dAngle, crBright, crDark); pDC->SetPixelV(p.x - lYoffset, p.y + lXoffset, crColour); crColour = GetColour(Pi - dAngle, crBright, crDark); pDC->SetPixelV(p.x - lXoffset, p.y + lYoffset, crColour); crColour = GetColour(-Pi + dAngle, crBright, crDark); pDC->SetPixelV(p.x - lXoffset, p.y - lYoffset, crColour); crColour = GetColour(-Pi_on_2 - dAngle, crBright, crDark); pDC->SetPixelV(p.x - lYoffset, p.y - lXoffset, crColour); crColour = GetColour(-Pi_on_2 + dAngle, crBright, crDark); pDC->SetPixelV(p.x + lYoffset, p.y - lXoffset, crColour); crColour = GetColour(-dAngle, crBright, crDark); pDC->SetPixelV(p.x + lXoffset, p.y - lYoffset, crColour); //Advance the error term and the constant X axis step lError += lYoffset++; //Check to see if error term has overflowed if ((lError += lYoffset) >= 0) lError -= --lXoffset * 2; } while (lYoffset <= lXoffset); //Continue until halfway point } COLORREF GetColour(double dAngle, COLORREF crBright, COLORREF crDark) { #define Rad2Deg 180.0/3.1415 #define LIGHT_SOURCE_ANGLE -2.356 // -2.356 radians = -135 degrees, i.e. From top left ASSERT(dAngle > -3.1416 && dAngle < 3.1416); double dAngleDifference = LIGHT_SOURCE_ANGLE - dAngle; if (dAngleDifference < -3.1415) dAngleDifference = 6.293 + dAngleDifference; else if (dAngleDifference > 3.1415) dAngleDifference = 6.293 - dAngleDifference; double Weight = 0.5*(cos(dAngleDifference)+1.0); BYTE Red = (BYTE) (Weight*GetRValue(crBright) + (1.0-Weight)*GetRValue(crDark)); BYTE Green = (BYTE) (Weight*GetGValue(crBright) + (1.0-Weight)*GetGValue(crDark)); BYTE Blue = (BYTE) (Weight*GetBValue(crBright) + (1.0-Weight)*GetBValue(crDark)); //TRACE("LightAngle = %0.0f, Angle = %3.0f, Diff = %3.0f, Weight = %0.2f, RGB %3d,%3d,%3d\n", // LIGHT_SOURCE_ANGLE*Rad2Deg, dAngle*Rad2Deg, dAngleDifference*Rad2Deg, Weight,Red,Green,Blue); return RGB(Red, Green, Blue); } ///////////////////////////////////////////////////////////////////////////// // CSButton CSButton::CSButton() { m_bFocusCircle = TRUE; m_clrFocusCircle = RGB(0,0,0); // No tooltip created m_ToolTip.m_hWnd = NULL; m_Forcolor = ::GetSysColor(COLOR_3DFACE); // No associated menu m_hMenu = NULL; m_hParentWndMenu = NULL; m_bMenuDisplayed = FALSE; } CSButton::~CSButton() { } BEGIN_MESSAGE_MAP(CSButton, CButton) //{{AFX_MSG_MAP(CSButton) // NOTE - the ClassWizard will add and remove mapping macros here. //}}AFX_MSG_MAP END_MESSAGE_MAP() ///////////////////////////////////////////////////////////////////////////// // CSButton message handlers void CSButton::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct) { // TODO: Add your code to draw the specified item ASSERT(lpDrawItemStruct != NULL); CDC* pDC = CDC::FromHandle(lpDrawItemStruct->hDC); CRect rect = lpDrawItemStruct->rcItem; UINT state = lpDrawItemStruct->itemState; UINT nStyle = GetStyle(); int nRadius = m_nRadius; int nSavedDC = pDC->SaveDC(); CRgn rg; int nWidth = rect.right - rect.left; int nHeight = rect.bottom - rect.top; // rg.CreateRoundRectRgn(rect.left,rect.top,rect.right,rect.bottom,nWidth,nHeight); CBrush brush; brush.CreateSolidBrush(m_Forcolor); pDC->FillRgn(&rg,&brush); //release rg,brush gdi resource rg.DeleteObject(); brush.DeleteObject(); // pDC->FillSolidRect(rect, ::GetSysColor(COLOR_BTNFACE)); // Draw the focus circle around the button if(nStyle & BS_BITMAP) { ; } else { if ((state & ODS_FOCUS)) { DrawCircle(pDC, m_ptCentre, nRadius--, RGB(0,0,0)); } else { DrawCircle(pDC, m_ptCentre, nRadius++, m_Forcolor); } } // Draw the raised/sunken edges of the button (unless flat) COLORREF clref = ::GetSysColor(COLOR_BTNFACE); if(nStyle & BS_BITMAP) { ; } else { if (nStyle & BS_FLAT) { if(state&ODS_SELECTED)//BS_FLAT Style and Selected { DrawCircle(pDC, m_ptCentre, nRadius--, clref); } //DrawCircle(pDC, tempPoint, nRadius--, ::GetSysColor(COLOR_3DHIGHLIGHT)); //this draws the white line } else { if (state & ODS_SELECTED)// Non BS_FLAT Style and selected { DrawCircle(pDC, m_ptCentre, nRadius--, ::GetSysColor(COLOR_3DDKSHADOW), ::GetSysColor(COLOR_3DHIGHLIGHT)); DrawCircle(pDC, m_ptCentre, nRadius--, ::GetSysColor(COLOR_3DSHADOW), ::GetSysColor(COLOR_3DLIGHT)); } else { DrawCircle(pDC, m_ptCentre, nRadius--, ::GetSysColor(COLOR_3DHIGHLIGHT), ::GetSysColor(COLOR_3DDKSHADOW)); DrawCircle(pDC, m_ptCentre, nRadius++, ::GetSysColor(COLOR_3DLIGHT), ::GetSysColor(COLOR_3DSHADOW)); } } } // draw the text if there is any CString strText; GetWindowText(strText); if((nStyle & BS_ICON)||(nStyle & BS_BITMAP)) {;} else { if (!strText.IsEmpty()) { CRgn rgn; rgn.CreateEllipticRgn(m_ptCentre.x-nRadius, m_ptCentre.y-nRadius, m_ptCentre.x+nRadius, m_ptCentre.y+nRadius); pDC->SelectClipRgn(&rgn); CSize Extent = pDC->GetTextExtent(strText); CPoint pt = CPoint( m_ptCentre.x - E