RoundButton.cpp
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上传日期:2007-01-01
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- // RoundButton.cpp : implementation file
- //
- // Round Buttons!
- //
- // Written by Chris Maunder (Chris.Maunder@cbr.clw.csiro.au)
- // Copyright (c) 1997,1998.
- //
- // Modified: 2 Feb 1998 - Fix vis problem, CRgn resource leak,
- // button reposition code redone. CJM.
- //
- // 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 to your
- // computer, causes your pet cat to fall ill, increases baldness or
- // makes you car start emitting strange noises when you start it up.
- //
- // Expect bugs.
- //
- // Please use and enjoy. Please let me know of any bugs/mods/improvements
- // that you have found/implemented and I will fix/incorporate them into this
- // file.
- //
- /////////////////////////////////////////////////////////////////////////////
- #include "stdafx.h"
- #include "math.h"
- #include "RoundButton.h"
- #ifdef _DEBUG
- #define new DEBUG_NEW
- #undef THIS_FILE
- static char THIS_FILE[] = __FILE__;
- #endif
- // prototypes
- COLORREF GetColour(double dAngle, COLORREF crBright, COLORREF crDark);
- void DrawCircle(CDC* pDC, CPoint p, LONG lRadius, COLORREF crColour, BOOL bDashed = FALSE);
- void DrawCircleLeft(CDC* pDC, CPoint p, LONG lRadius, COLORREF crBright, COLORREF crDark);
- void DrawCircleRight(CDC* pDC, CPoint p, LONG lRadius, COLORREF crBright, COLORREF crDark);
- // Calculate colour for a point at the given angle by performing a linear
- // interpolation between the colours crBright and crDark based on the cosine
- // of the angle between the light source and the point.
- //
- // Angles are measured from the +ve x-axis (i.e. (1,0) = 0 degrees, (0,1) = 90 degrees )
- // But remember: +y points down!
- COLORREF GetColour(double dAngle, COLORREF crBright, COLORREF crDark)
- {
- #define Rad2Deg 180.0/3.1415
- // For better light-continuity along the edge of a stretched button:
- // LIGHT_SOURCE_ANGLE == -1.88
-
- //#define LIGHT_SOURCE_ANGLE -2.356 // -2.356 radians = -135 degrees, i.e. From top left
- #define LIGHT_SOURCE_ANGLE -1.88
- 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,%3dn",
- // LIGHT_SOURCE_ANGLE*Rad2Deg, dAngle*Rad2Deg, dAngleDifference*Rad2Deg, Weight,Red,Green,Blue);
- return RGB(Red, Green, Blue);
- }
- 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
- }
- // The original Drawcircle function is split up into DrawCircleRight and DrawCircleLeft
- // to make stretched buttons
- //
- void DrawCircleRight(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 four 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(-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
- }
- // The original Drawcircle function is split up into DrawCircleRight and DrawCircleLeft
- // to make stretched buttons
- //
- void DrawCircleLeft(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(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);
- //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
- }
- /////////////////////////////////////////////////////////////////////////////
- // CRoundButton
- CRoundButton::CRoundButton()
- {
- m_bDrawDashedFocusCircle = TRUE;
- }
- CRoundButton::~CRoundButton()
- {
- m_rgn.DeleteObject();
- }
- BEGIN_MESSAGE_MAP(CRoundButton, CButton)
- //{{AFX_MSG_MAP(CRoundButton)
- //}}AFX_MSG_MAP
- END_MESSAGE_MAP()
- /////////////////////////////////////////////////////////////////////////////
- // CRoundButton message handlers
- void CRoundButton::PreSubclassWindow()
- {
- CButton::PreSubclassWindow();
- ModifyStyle(0, BS_OWNERDRAW);
- CRect rect;
- GetClientRect(rect);
- // set m_bStretch if the button is not square and landscape
- m_bStretch = rect.Width() > rect.Height() ? TRUE : FALSE;
- // Resize the window to make it square if it is not stretched
- if(!m_bStretch) rect.bottom = rect.right = min(rect.bottom,rect.right);
- // Get the vital statistics of the window
- // m_ptLeft/m_ptRight are the centerpoints of the left/right arcs of stretched buttons
- m_ptCentre = m_ptLeft = m_ptRight = rect.CenterPoint();
- m_nRadius = rect.bottom/2-1;
- m_ptLeft.x = m_nRadius;
- m_ptRight.x = rect.right - m_nRadius - 1;
- // Set the window region so mouse clicks only activate the round section
- // of the button
- m_rgn.DeleteObject();
- SetWindowRgn(NULL, FALSE);
- m_rgn.CreateEllipticRgnIndirect(rect);
- SetWindowRgn(m_rgn, TRUE);
- // Convert client coords to the parents client coords
- ClientToScreen(rect);
- CWnd* pParent = GetParent();
- if (pParent) pParent->ScreenToClient(rect);
- // Resize the window if it is not stretched
- if(!m_bStretch) MoveWindow(rect.left, rect.top, rect.Width(), rect.Height(), TRUE);
- }
- void CRoundButton::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
- {
- 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();
- pDC->SelectStockObject(NULL_BRUSH);
- pDC->FillSolidRect(rect, ::GetSysColor(COLOR_BTNFACE));
- // Draw the focus circle around the button for non-stretched buttons
- if ((state & ODS_FOCUS) && m_bDrawDashedFocusCircle && !m_bStretch)
- DrawCircle(pDC, m_ptCentre, nRadius--, RGB(0,0,0));
- // Draw the raised/sunken edges of the button (unless flat)
- if (nStyle & BS_FLAT) {
- // for stretched buttons: draw left and right arcs and connect the with lines
- if(m_bStretch)
- {
- CPen* oldpen;
-
- CRect LeftBound(0,0,nRadius*2,nRadius*2);
- CRect RightBound(m_ptRight.x-nRadius,0,m_ptRight.x+nRadius,nRadius*2);
- oldpen = pDC->SelectObject(new CPen(PS_SOLID, 1, ::GetSysColor(COLOR_3DDKSHADOW)));
- pDC->Arc(LeftBound, CPoint(m_ptLeft.x,0), CPoint(m_ptLeft.x,nRadius*2));
- pDC->Arc(RightBound, CPoint(m_ptRight.x,nRadius*2), CPoint(m_ptRight.x,0));
- pDC->MoveTo(m_ptLeft.x,0); pDC->LineTo(m_ptRight.x,0);
- pDC->MoveTo(m_ptLeft.x,nRadius*2-1); pDC->LineTo(m_ptRight.x,nRadius*2-1);
- nRadius--;
- LeftBound.DeflateRect(1,1);
- RightBound.DeflateRect(1,1);
- delete pDC->SelectObject(new CPen(PS_SOLID, 1, ::GetSysColor(COLOR_3DHIGHLIGHT)));
- pDC->Arc(LeftBound, CPoint(m_ptLeft.x,1), CPoint(m_ptLeft.x,nRadius*2));
- pDC->Arc(RightBound, CPoint(m_ptRight.x,nRadius*2), CPoint(m_ptRight.x,0));
- pDC->MoveTo(m_ptLeft.x,1); pDC->LineTo(m_ptRight.x,1);
- pDC->MoveTo(m_ptLeft.x,nRadius*2); pDC->LineTo(m_ptRight.x,nRadius*2);
- delete pDC->SelectObject(oldpen);
- }
- // for non-stretched buttons: draw two circles
- else
- {
- DrawCircle(pDC, m_ptCentre, nRadius--, ::GetSysColor(COLOR_3DDKSHADOW));
- DrawCircle(pDC, m_ptCentre, nRadius--, ::GetSysColor(COLOR_3DHIGHLIGHT));
- }
- } else {
- if ((state & ODS_SELECTED)) {
- // draw the circular segments for stretched AND non-stretched buttons
- DrawCircleLeft(pDC, m_ptLeft, nRadius,
- ::GetSysColor(COLOR_3DDKSHADOW), ::GetSysColor(COLOR_3DHIGHLIGHT));
- DrawCircleRight(pDC, m_ptRight, nRadius,
- ::GetSysColor(COLOR_3DDKSHADOW), ::GetSysColor(COLOR_3DHIGHLIGHT));
- DrawCircleLeft(pDC, m_ptLeft, nRadius-1,
- ::GetSysColor(COLOR_3DSHADOW), ::GetSysColor(COLOR_3DLIGHT));
- DrawCircleRight(pDC, m_ptRight, nRadius-1,
- ::GetSysColor(COLOR_3DSHADOW), ::GetSysColor(COLOR_3DLIGHT));
- // draw connecting lines for stretched buttons only
- if (m_bStretch)
- {
- CPen* oldpen;
- CPen* mypen;
- oldpen = pDC->SelectObject(new CPen(PS_SOLID, 1, ::GetSysColor(COLOR_3DDKSHADOW)));
- pDC->MoveTo(m_ptLeft.x, 1); pDC->LineTo(m_ptRight.x, 1);
- delete pDC->SelectObject(new CPen(PS_SOLID, 1, ::GetSysColor(COLOR_3DSHADOW)));
- pDC->MoveTo(m_ptLeft.x, 2); pDC->LineTo(m_ptRight.x, 2);
- delete pDC->SelectObject(new CPen(PS_SOLID, 1, ::GetSysColor(COLOR_3DLIGHT)));
- pDC->MoveTo(m_ptLeft.x, m_ptLeft.y + nRadius-1); pDC->LineTo(m_ptRight.x, m_ptLeft.y + nRadius-1);
- delete pDC->SelectObject(new CPen(PS_SOLID, 1, ::GetSysColor(COLOR_3DHIGHLIGHT)));
- pDC->MoveTo(m_ptLeft.x, m_ptLeft.y + nRadius); pDC->LineTo(m_ptRight.x, m_ptLeft.y + nRadius);
- delete pDC->SelectObject(oldpen);
- }
-
- } else {
- // draw the circular segments for stretched AND non-stretched buttons
- DrawCircleLeft(pDC, m_ptLeft, nRadius,
- ::GetSysColor(COLOR_3DHIGHLIGHT), ::GetSysColor(COLOR_3DDKSHADOW));
- DrawCircleRight(pDC, m_ptRight, nRadius,
- ::GetSysColor(COLOR_3DHIGHLIGHT), ::GetSysColor(COLOR_3DDKSHADOW));
- DrawCircleLeft(pDC, m_ptLeft, nRadius - 1,
- ::GetSysColor(COLOR_3DLIGHT), ::GetSysColor(COLOR_3DSHADOW));
- DrawCircleRight(pDC, m_ptRight, nRadius - 1,
- ::GetSysColor(COLOR_3DLIGHT), ::GetSysColor(COLOR_3DSHADOW));
- // draw connecting lines for stretched buttons only
- if (m_bStretch)
- {
- CPen* oldpen;
- oldpen = pDC->SelectObject(new CPen(PS_SOLID, 1, pDC->GetPixel(m_ptLeft.x, 1)));
- pDC->MoveTo(m_ptLeft.x, 1); pDC->LineTo(m_ptRight.x, 1);
- delete pDC->SelectObject(new CPen(PS_SOLID, 1, pDC->GetPixel(m_ptLeft.x, 2)));
- pDC->MoveTo(m_ptLeft.x, 2); pDC->LineTo(m_ptRight.x, 2);
- delete pDC->SelectObject(new CPen(PS_SOLID, 1, pDC->GetPixel(m_ptLeft.x, m_ptLeft.y + nRadius)));
- pDC->MoveTo(m_ptLeft.x, m_ptLeft.y + nRadius); pDC->LineTo(m_ptRight.x, m_ptLeft.y + nRadius);
- delete pDC->SelectObject(new CPen(PS_SOLID, 1, pDC->GetPixel(m_ptLeft.x, m_ptLeft.y + nRadius - 1)));
- pDC->MoveTo(m_ptLeft.x, m_ptLeft.y + nRadius - 1); pDC->LineTo(m_ptRight.x, m_ptLeft.y + nRadius - 1);
-
- delete pDC->SelectObject(oldpen);
- }
- }
- }
-
- // draw the text if there is any
- CString strText;
- GetWindowText(strText);
- if (!strText.IsEmpty())
- {
- CRgn rgn;
- if (m_bStretch){
- rgn.CreateRectRgn(m_ptLeft.x-nRadius/2, m_ptCentre.y-nRadius,
- m_ptRight.x+nRadius/2, m_ptCentre.y+nRadius);}
- else{
- 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 - Extent.cx/2, m_ptCentre.y - Extent.cy/2 );
- if (state & ODS_SELECTED) pt.Offset(1,1);
- pDC->SetBkMode(TRANSPARENT);
- if (state & ODS_DISABLED)
- pDC->DrawState(pt, Extent, strText, DSS_DISABLED, TRUE, 0, (HBRUSH)NULL);
- else
- {
- // changed this code to give the text a 3d-look
- COLORREF oldcol = pDC->SetTextColor(::GetSysColor(COLOR_3DHIGHLIGHT));
- pDC->TextOut(pt.x, pt.y, strText);
- pDC->SetTextColor(::GetSysColor(COLOR_3DDKSHADOW));
- pDC->TextOut(pt.x-1, pt.y-1, strText);
- pDC->SetTextColor(oldcol);
- }
- pDC->SelectClipRgn(NULL);
- rgn.DeleteObject();
- }
- // Draw the focus circle on the inside of the button if it is non-stretched
- if ((state & ODS_FOCUS) && m_bDrawDashedFocusCircle && !m_bStretch)
- DrawCircle(pDC, m_ptCentre, nRadius-2, RGB(0,0,0), TRUE);
- pDC->RestoreDC(nSavedDC);
- }