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Large Pack of OldSkool DOS MOD Trackers
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beaversweeper_v101.zip
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RoundSliderCtrl.cpp
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C/C++ Source or Header
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2005-10-07
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// RoundSliderCtrl.cpp : implementation file
//
#include "stdafx.h"
#include "tracker.h"
#include "RoundSliderCtrl.h"
#include <math.h>
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
static const double pi = 3.141592653589793238462643383279;
// The following 3 functions were taken from 'CRoundButton.cpp', written and
// copyright (c) 1997,1998 by Chris Maunder (chrismaunder@codeguru.com).
// To be honest, I never had a look at their implementation, I just use them.
// This is cut-and-paste-programming at its best... if it works... :)
// prototypes
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);
// 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
#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);
}
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((float)lYoffset, (float)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
}
/////////////////////////////////////////////////////////////////////////////
// CRoundSliderCtrl
IMPLEMENT_DYNAMIC(CRoundSliderCtrl, CSliderCtrl)
CRoundSliderCtrl::CRoundSliderCtrl()
{
// m_strText = "%ld░";
m_strText = "%f";
m_nKnobRadius = 7;
m_nZero = 0;
m_bInverted = false;
m_bDragging = false;
m_bDrawRadioButton = true;
}
CRoundSliderCtrl::~CRoundSliderCtrl()
{
}
BEGIN_MESSAGE_MAP(CRoundSliderCtrl, CSliderCtrl)
//{{AFX_MSG_MAP(CRoundSliderCtrl)
ON_WM_SIZE()
ON_WM_ERASEBKGND()
ON_WM_PAINT()
ON_WM_LBUTTONDOWN()
ON_WM_MOUSEMOVE()
ON_WM_LBUTTONUP()
ON_WM_KEYDOWN()
ON_WM_KEYUP()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
void CRoundSliderCtrl::PreSubclassWindow()
{
CSliderCtrl::PreSubclassWindow();
SetRange(0, 359, FALSE);
SetLineSize(1);
SetPageSize(10);
Init();
}
BOOL CRoundSliderCtrl::PreCreateWindow(CREATESTRUCT& cs)
{
if(!CSliderCtrl::PreCreateWindow(cs)) return FALSE;
SetRange(0, 359, FALSE);
SetLineSize(1);
SetPageSize(10);
Init();
return TRUE;
}
void CRoundSliderCtrl::OnSize(UINT nType, int cx, int cy)
{
CSliderCtrl::OnSize(nType, cx, cy);
Init();
}
void CRoundSliderCtrl::Init()
{
CRect rc;
GetClientRect(rc);
// Resize the window to make it square
rc.bottom = rc.right = max(rc.bottom, rc.right);
// Get the vital statistics of the window
m_ptCenter = rc.CenterPoint();
m_ptCenter.y-=8;
m_nRadius = rc.bottom/2-(m_nKnobRadius+1)-5;
// Set the window region so mouse clicks only activate the round section
// of the slider
/*
m_rgn.DeleteObject();
SetWindowRgn(NULL, FALSE);
m_rgn.CreateEllipticRgnIndirect(rc);
SetWindowRgn(m_rgn, TRUE);
*/
// VerifyPos();
}
#pragma warning(disable:4100) // Unreferenced formal parameter
BOOL CRoundSliderCtrl::OnEraseBkgnd(CDC* pDC)
{
return TRUE;
}
#pragma warning(default:4100)
void CRoundSliderCtrl::OnPaint()
{
const int nMin = GetRangeMin();
const int nMax = GetRangeMax()+1;
int nRadius = m_nRadius;
// Draw (clear) the background
CRect rc;
GetClientRect(rc);
CPaintDC dc_(this); // device context for painting
#ifdef USE_MEM_DC
CMemDC pDC(&dc);
#else
CDC dcc;
dcc.CreateCompatibleDC(0);
CBitmap bmp;
bmp.CreateCompatibleBitmap( &dc_, rc.right, rc.bottom );
dcc.SelectObject( &bmp );
CDC* pDC = &dcc;
#endif
pDC->SelectStockObject(NULL_BRUSH);
pDC->FillSolidRect(rc, ::GetSysColor(COLOR_BTNFACE));
// pDC->FillSolidRect(rc, ::GetSysColor(COLOR_BACKGROUND));
// Draw the sliders channel
if (!m_bDrawRadioButton)
{
DrawCircle(pDC, m_ptCenter, nRadius--, ::GetSysColor(COLOR_3DDKSHADOW),::GetSysColor(COLOR_3DHIGHLIGHT));
DrawCircle(pDC, m_ptCenter, nRadius, ::GetSysColor(COLOR_3DSHADOW),::GetSysColor(COLOR_3DLIGHT));
}
int nPos = (((GetPos()-nMin)*360/(nMax-nMin)) + m_nZero + 360) % 360;
if(m_bInverted) nPos = 360-nPos;
const double dPos = ((double)(nPos))*pi/180.0;
#pragma warning(disable:4244) // Disable warning "Converting 'double' to 'int', possible loss of data"
CPoint ptKnobCenter;
if (m_bDrawRadioButton)
{
ptKnobCenter = CPoint( m_ptCenter.x + (nRadius-m_nKnobRadius) * sin(dPos),
m_ptCenter.y - (nRadius-m_nKnobRadius) *
cos(dPos));
}
else
{
ptKnobCenter = CPoint( m_ptCenter.x + (nRadius) * sin(dPos),
m_ptCenter.y - (nRadius) * cos(dPos));
}
#pragma warning(default:4244)
nRadius+=2;
DrawCircle(pDC, m_ptCenter, nRadius--, ::GetSysColor(COLOR_3DHIGHLIGHT),::GetSysColor(COLOR_3DDKSHADOW));
DrawCircle(pDC, m_ptCenter, nRadius--, ::GetSysColor(COLOR_3DLIGHT), ::GetSysColor(COLOR_3DSHADOW));
// Draw the knob
int nKnobRadius;
if (m_bDrawRadioButton)
{
#pragma warning(disable:4244) // Disable warning "Converting 'double' to 'int', possible loss of data"
nKnobRadius= m_nKnobRadius*0.8;
#pragma warning(default:4244)
}
else
{
nKnobRadius= m_nKnobRadius;
}
const CRect rcKnob( ptKnobCenter.x - nKnobRadius, ptKnobCenter.y - nKnobRadius,
ptKnobCenter.x + nKnobRadius, ptKnobCenter.y + nKnobRadius);
CRgn rgnKnob;
rgnKnob.CreateEllipticRgnIndirect(rcKnob);
CBrush brKnob(::GetSysColor(COLOR_BTNFACE));
pDC->FillRgn(&rgnKnob, &brKnob);
rgnKnob.DeleteObject();
if (!m_bDrawRadioButton)
{
if(m_bDragging)
{
DrawCircle(pDC, ptKnobCenter, --nKnobRadius, ::GetSysColor(COLOR_3DDKSHADOW),::GetSysColor(COLOR_3DHIGHLIGHT));
DrawCircle(pDC, ptKnobCenter, --nKnobRadius, ::GetSysColor(COLOR_3DSHADOW),::GetSysColor(COLOR_3DLIGHT));
}
else
{
DrawCircle(pDC, ptKnobCenter, --nKnobRadius, ::GetSysColor(COLOR_3DHIGHLIGHT), ::GetSysColor(COLOR_3DDKSHADOW));
DrawCircle(pDC, ptKnobCenter, --nKnobRadius, ::GetSysColor(COLOR_3DLIGHT), ::GetSysColor(COLOR_3DSHADOW));
}
}
else
{
DrawCircle(pDC, ptKnobCenter, --nKnobRadius, ::GetSysColor(COLOR_3DDKSHADOW),::GetSysColor(COLOR_3DHIGHLIGHT));
DrawCircle(pDC, ptKnobCenter, --nKnobRadius, ::GetSysColor(COLOR_3DSHADOW),::GetSysColor(COLOR_3DLIGHT));
}
// Draw the focus circle on the inside of the knob
if (!m_bDrawRadioButton)
if(GetFocus() == this)
{
DrawCircle(pDC, ptKnobCenter, nKnobRadius-2, RGB(0, 0, 0), TRUE);
}
// Draw the text
const CString strFormattedText = OnFormatText();
if(!strFormattedText.IsEmpty())
{
CWnd* pOwner = GetParentOwner();
if(pOwner)
{
CFont* pFont = pOwner->GetFont();
pDC->SelectObject(pFont);
}
const CSize szExtent = pDC->GetTextExtent(strFormattedText);
const CPoint ptText = CPoint(m_ptCenter.x - szExtent.cx/2, m_nRadius+m_ptCenter.y/* + szExtent.cy*/);
pDC->SetBkMode(TRANSPARENT);
if(!IsWindowEnabled())
{
pDC->DrawState(ptText, szExtent, strFormattedText, DSS_DISABLED, TRUE, 0,(HBRUSH)NULL);
}
else
{
pDC->TextOut(ptText.x, ptText.y, strFormattedText);
}
}
#ifdef USE_MEM_DC
CMemDC pDC(&dc);
#else
dc_.BitBlt( 0, 0, rc.right, rc.bottom, pDC, 0, 0, SRCCOPY );
#endif
// Don't call CSliderCtrl::OnPaint()
}
void CRoundSliderCtrl::OnLButtonDown(UINT nFlags, CPoint point)
{
if(!m_bDragging)
{
m_bDragging = true;
m_bDragChanged = false;
SetCapture();
SetFocus();
if(SetKnob(point))
{
m_bDragChanged = true;
PostMessageToParent(TB_THUMBTRACK);
}
RedrawWindow();
}
else
{
CSliderCtrl::OnLButtonDown(nFlags, point);
}
}
void CRoundSliderCtrl::OnMouseMove(UINT nFlags, CPoint point)
{
if(m_bDragging)
{
if(SetKnob(point))
{
m_bDragChanged = true;
PostMessageToParent(TB_THUMBTRACK);
RedrawWindow();
}
}
else
{
CSliderCtrl::OnMouseMove(nFlags, point);
}
}
void CRoundSliderCtrl::OnLButtonUp(UINT nFlags, CPoint point)
{
if(m_bDragging)
{
m_bDragging = false;
::ReleaseCapture();
if(SetKnob(point))
{
PostMessageToParent(TB_THUMBTRACK);
m_bDragChanged = true;
}
if(m_bDragChanged)
{
PostMessageToParent(TB_THUMBPOSITION);
m_bDragChanged = false;
}
RedrawWindow();
}
else
{
CSliderCtrl::OnLButtonUp(nFlags, point);
}
}
bool CRoundSliderCtrl::SetKnob(const CPoint& pt)
{
const int nMin = GetRangeMin();
const int nMax = GetRangeMax()+1;
CSize szDelta = pt - m_ptCenter;
if(m_bInverted) szDelta.cx *= -1;
double dNewPos = 0.0;
if(szDelta.cx != 0)
{
dNewPos = 90.0 - atan(-(double)szDelta.cy / (double)szDelta.cx) * 180.0 / pi;
}
if(((szDelta.cx == 0) && (szDelta.cy >= 0)) || (szDelta.cx < 0))
{
dNewPos += 180.0;
}
dNewPos -= m_nZero;
while(dNewPos < 0.0) dNewPos += 360.0;
while(dNewPos >= 360.0) dNewPos -= 360.0;
const int nNewPos = nMin + (int)(dNewPos*(nMax-nMin)/360.0);
const bool bChanged = (nNewPos != GetPos());
if(bChanged)
{
SetPos(nNewPos);
}
return bChanged;
}
void CRoundSliderCtrl::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
const int nMin = GetRangeMin();
const int nMax = GetRangeMax()+1;
switch(nChar)
{
case VK_LEFT:
case VK_UP:
{
int nNewPos = GetPos()-GetLineSize();
while(nNewPos < nMin) nNewPos += (nMax - nMin);
SetPos(nNewPos);
RedrawWindow();
PostMessageToParent(TB_LINEUP);
}
break;
case VK_RIGHT:
case VK_DOWN:
{
int nNewPos = GetPos()+GetLineSize();
while(nNewPos >= nMax) nNewPos -= (nMax - nMin);
SetPos(nNewPos);
RedrawWindow();
PostMessageToParent(TB_LINEDOWN);
}
break;
case VK_PRIOR:
{
int nNewPos = GetPos()-GetPageSize();
while(nNewPos < nMin) nNewPos += (nMax - nMin);
SetPos(nNewPos);
RedrawWindow();
PostMessageToParent(TB_PAGEUP);
}
break;
case VK_NEXT:
{
int nNewPos = GetPos()+GetPageSize();
while(nNewPos >= nMax) nNewPos -= (nMax - nMin);
SetPos(nNewPos);
RedrawWindow();
PostMessageToParent(TB_PAGEDOWN);
}
break;
case VK_HOME:
case VK_END:
// Do nothing (ignore keystroke)
break;
default:
CSliderCtrl::OnKeyDown(nChar, nRepCnt, nFlags);
}
}
void CRoundSliderCtrl::OnKeyUp(UINT nChar, UINT nRepCnt, UINT nFlags)
{
switch(nChar)
{
case VK_LEFT:
case VK_UP:
case VK_RIGHT:
case VK_DOWN:
case VK_PRIOR:
case VK_NEXT:
PostMessageToParent(TB_ENDTRACK);
break;
case VK_HOME:
case VK_END:
// Do nothing
break;
default:
CSliderCtrl::OnKeyUp(nChar, nRepCnt, nFlags);
}
}
void CRoundSliderCtrl::PostMessageToParent(const int nTBCode) const
{
CWnd* pWnd = GetParent();
if(pWnd) pWnd->PostMessage(WM_HSCROLL, (WPARAM)((GetPos() << 16) | nTBCode),(LPARAM)GetSafeHwnd());
}
void CRoundSliderCtrl::SetScale (const float scale)
{
m_scale = scale;
}
float CRoundSliderCtrl::GetScale (void) const
{
return m_scale;
}
void CRoundSliderCtrl::SetText(const CString& strNewText)
{
m_strText = strNewText;
}
CString CRoundSliderCtrl::GetText() const
{
return m_strText;
}
void CRoundSliderCtrl::SetKnobRadius(const int nNewKnobRadius)
{
ASSERT(nNewKnobRadius > 4);
m_nKnobRadius = nNewKnobRadius;
}
void CRoundSliderCtrl::SetDrawRadioButton(const bool nDrawRadioButton)
{
m_bDrawRadioButton = nDrawRadioButton;
}
int CRoundSliderCtrl::GetKnobRadius() const
{
return m_nKnobRadius;
}
void CRoundSliderCtrl::SetZero(const int nZero)
{
ASSERT(nZero >= 0 && nZero < 360);
m_nZero = nZero;
}
int CRoundSliderCtrl::GetZero() const
{
return m_nZero;
}
void CRoundSliderCtrl::SetInverted(const bool bNewInverted)
{
m_bInverted = bNewInverted;
}
bool CRoundSliderCtrl::GetInverted()
{
return m_bInverted;
}
// Overrideables
CString CRoundSliderCtrl::OnFormatText()
{
CString strFormattedText;
strFormattedText.Format(GetText(), GetPos()*m_scale);
return strFormattedText;
}
#ifdef _DEBUG
void CRoundSliderCtrl::AssertValid() const
{
CSliderCtrl::AssertValid();
ASSERT(m_nZero >= 0 && m_nZero < 360);
ASSERT(m_nKnobRadius > 4);
}
void CRoundSliderCtrl::Dump(CDumpContext& dc) const
{
CSliderCtrl::Dump(dc);
dc << "m_strText = '" << m_strText << "'\n"
<< "m_nKnobRadius = " << m_nKnobRadius << "\n"
<< "m_nZero = " << m_nZero;
}
#endif // _DEBUG