?? ellepticalbutton.cpp
字號:
///
//Modify by 徐景周 2000.10
//功能：橢圓按鈕顯示效果
//
/////////////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "math.h"
#include "EllepticalButton.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 DrawEllipse(CDC* pDC, CPoint p, LONG lHorizontalRadius,LONG lVerticalRadius, COLORREF crColour, BOOL bDashed = FALSE);
void DrawEllipse(CDC* pDC, CPoint p, LONG lHorizontalRadius, LONG lVerticalRadius,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 DrawEllipse(CDC* pDC, CPoint p, LONG lHorizontalRadius,LONG lVerticalRadius, COLORREF crColour, BOOL bDashed)
{
const int nDashLength = 1;
LONG lXoffset, lYoffset;
int nDash = 0;
BOOL bDashOn = TRUE;
//Check to see that the coordinates are valid
ASSERT( (p.x + lHorizontalRadius <= LONG_MAX) && (p.y + lVerticalRadius <= LONG_MAX) );
ASSERT( (p.x - lHorizontalRadius >= LONG_MIN) && (p.y - lVerticalRadius >= LONG_MIN) );
long d1,d2;
long t1,t2,t3,t4,t5,t6,t7,t8,t9;
lXoffset = lHorizontalRadius;
lYoffset= 0;
t1 = lHorizontalRadius*lHorizontalRadius; t2 = 4*t1; t3 = 2*t2;
t4 = lVerticalRadius*lVerticalRadius;
t5 = 4*t4;
t6 = 2*t5;
t7 = lHorizontalRadius*t5; t8 = 2*t7;
t9 = 0; d1 = t2 - t7 + t4;
d2 = t1 - t8 + t5;
while (d2 < 0)
{/* region 1 of ellipse*/
if (bDashOn) {
pDC->SetPixelV(p.x + lXoffset, p.y + lYoffset, crColour);
pDC->SetPixelV(p.x + lXoffset, p.y - lYoffset, 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
lYoffset++;
t9 = t9 + t3;
if (d1 < 0) { d1 = d1 + t9 + t2; d2 = d2 + t9; }
else
{ lXoffset --; t8 = t8 - t6; d1 = d1 - t8 + t9 + t2; d2 = d2 - t8 + t9 + t5;
}
if (bDashed && (++nDash == nDashLength)) {
nDash = 0;
bDashOn = !bDashOn;
}
}
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 - lXoffset, p.y + lYoffset, crColour);
pDC->SetPixelV(p.x - lXoffset, p.y - lYoffset, crColour);
}
lXoffset--;
t8 = t8 - t6;
if (d2 < 0)
{
lYoffset ++; t9 = t9 + t3; d2 = d2 - t8 + t5 + t9;
}
else
d2 = d2 - t8 + t5;
if (bDashed && (++nDash == nDashLength)) {
nDash = 0;
bDashOn = !bDashOn;
}
} while (lXoffset>=0); //Continue until halfwaX point
}
void DrawEllipse(CDC* pDC, CPoint p, LONG lHorizontalRadius,LONG lVerticalRadius, COLORREF crBright, COLORREF crDark)
{
LONG lXoffset, lYoffset;
double dAngle ;
const double Pi = 3.141592654,
Pi_on_2 = Pi * 0.5,
Three_Pi_on_2 = Pi * 1.5;
COLORREF crColour;
//Check to see that the coordinates are valid
ASSERT( (p.x + lHorizontalRadius <= LONG_MAX) && (p.y + lVerticalRadius <= LONG_MAX) );
ASSERT( (p.x - lHorizontalRadius >= LONG_MIN) && (p.y - lVerticalRadius >= LONG_MIN) );
long d1,d2;
long t1,t2,t3,t4,t5,t6,t7,t8,t9;
lXoffset = lHorizontalRadius;
lYoffset= 0;
t1 = lHorizontalRadius*lHorizontalRadius; t2 = 4*t1; t3 = 2*t2;
t4 = lVerticalRadius*lVerticalRadius;
t5 = 4*t4;
t6 = 2*t5;
t7 = lHorizontalRadius*t5; t8 = 2*t7;
t9 = 0; d1 = t2 - t7 + t4;
d2 = t1 - t8 + t5;
while (d2 < 0)
{
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);
lYoffset++;
t9 = t9 + t3;
if (d1 < 0) { d1 = d1 + t9 + t2; d2 = d2 + t9; }
else
{
lXoffset --; t8 = t8 - t6; d1 = d1 - t8 + t9 + t2; d2 = d2 - t8 + t9 + t5;
}
}
do {
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);
lXoffset--;
t8 = t8 - t6;
if (d2 < 0)
{
lYoffset ++; t9 = t9 + t3; d2 = d2 - t8 + t5 + t9;
}
else
d2 = d2 - t8 + t5;
} while (lXoffset >=0);
}
/////////////////////////////////////////////////////////////////////////////
// CEllepticalButton
CEllepticalButton::CEllepticalButton()
{
m_bDrawDashedFocusCircle = TRUE;
}
CEllepticalButton::~CEllepticalButton()
{
m_rgn.DeleteObject();
}
BEGIN_MESSAGE_MAP(CEllepticalButton, CButton)
//{{AFX_MSG_MAP(CEllepticalButton)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CEllepticalButton message handlers
void CEllepticalButton::PreSubclassWindow()
{
CButton::PreSubclassWindow();
m_bDefault=GetStyle() & (DWORD)BS_DEFPUSHBUTTON; //this is necessary as
// the default button style gets removed when u make it ownerdrawn
ModifyStyle(0, BS_OWNERDRAW);
CRect rect;
GetClientRect(rect);
// Resize the window to make it square
//commented by Raghav
//rect.bottom = rect.right = min(rect.bottom,rect.right);
// Get the vital statistics of the window
m_ptCentre = rect.CenterPoint();
m_nHorizontalRadius = rect.right/2-1;
m_nVerticalRadius = rect.bottom/2-1;
// 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
MoveWindow(rect.left, rect.top, rect.Width(), rect.Height(), TRUE);
}
void CEllepticalButton::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
ASSERT(lpDrawItemStruct != NULL);
CDC* pDC = CDC::FromHandle(lpDrawItemStruct->hDC);
CRect rect = lpDrawItemStruct->rcItem;
UINT state = lpDrawItemStruct->itemState;
UINT nStyle = GetStyle();
int nHorizontalRadius = m_nHorizontalRadius;
int nVerticalRadius = m_nVerticalRadius;
int nSavedDC = pDC->SaveDC();
pDC->SelectStockObject(NULL_BRUSH);
pDC->FillSolidRect(rect, RGB(240,200,90)); //設置按鈕的背景色
// Draw the focus circle around the button either if it has the focus
//or if it is the default button
if ((state & ODS_FOCUS || m_bDefault) && m_bDrawDashedFocusCircle)
DrawEllipse(pDC, m_ptCentre, nHorizontalRadius--, nVerticalRadius--, RGB(0,0,0));
// Draw the raised/sunken edges of the button (unless flat)
if (nStyle & BS_FLAT) {
DrawEllipse(pDC, m_ptCentre, nHorizontalRadius--, nVerticalRadius--, RGB(0,0,0));
DrawEllipse(pDC, m_ptCentre, nHorizontalRadius--, nVerticalRadius--, ::GetSysColor(COLOR_3DHIGHLIGHT));
} else {
if ((state & ODS_SELECTED)) {
DrawEllipse(pDC, m_ptCentre, nHorizontalRadius--, nVerticalRadius--,
::GetSysColor(COLOR_3DDKSHADOW), ::GetSysColor(COLOR_3DHIGHLIGHT));
DrawEllipse(pDC, m_ptCentre, nHorizontalRadius--, nVerticalRadius--,
::GetSysColor(COLOR_3DSHADOW), ::GetSysColor(COLOR_3DLIGHT));
} else {
DrawEllipse(pDC, m_ptCentre, nHorizontalRadius--, nVerticalRadius--,
::GetSysColor(COLOR_3DHIGHLIGHT), ::GetSysColor(COLOR_3DDKSHADOW));
//RGB(255,255,255), ::GetSysColor(COLOR_3DDKSHADOW));
DrawEllipse(pDC, m_ptCentre, nHorizontalRadius--, nVerticalRadius--,
::GetSysColor(COLOR_3DHIGHLIGHT), ::GetSysColor(COLOR_3DSHADOW));
}
}
// draw the text if there is any
CString strText;
GetWindowText(strText);
if (!strText.IsEmpty())
{
CRgn rgn;
rgn.CreateEllipticRgn(m_ptCentre.x-nHorizontalRadius, m_ptCentre.y-nVerticalRadius,
m_ptCentre.x+nHorizontalRadius, m_ptCentre.y+nVerticalRadius);
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
pDC->TextOut(pt.x, pt.y, strText);
pDC->SelectClipRgn(NULL);
rgn.DeleteObject();
}
// Draw the focus circle on the inside of the button
if ((state & ODS_FOCUS) && m_bDrawDashedFocusCircle)
DrawEllipse(pDC, m_ptCentre, nHorizontalRadius-2, nVerticalRadius-2, RGB(0,0,0), TRUE);
pDC->RestoreDC(nSavedDC);
}
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