?? roundsliderctrl.cpp
字號:
/******************************************************************
** 文件名: RoundSliderCtrl.cpp : 類實現文件
** Copyright (c) 2002 魏巍所有
** 創建人: 魏巍
** 日 期: 2002/7/26
** 修改人:
** 日 期:
** 描 述: 該類為CSliderCtrl的派生類。擴充實現了圓形滑塊控件的功能，
并可以自定義控件內的顏色、圖片、設置控件內的文字等。
使用該類時的注意事項：
1、需要將MemDc.h文件加入工程中，考慮到該類的普遍性，可以
先將其改名。
2、添加鼠標指針資源 IDC_CURSOR
** 3、該類中用到的某些函數是從Internet上得來，版權仍歸其
本人所有。
4、該類在VC6下創建的，由于某些特殊性，在VC.NET下編譯將出現
不正常現象。
** 版 本:
******************************************************************/
#include "stdafx.h"
#include "RoundSliderCtrl.h"
#include <math.h>
#include "resource.h"
#include "MemDC.h"
#define USE_MEM_DC // Comment this out, if you don't want to use CMemDC
#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.
// 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... :) (Daniel)
// 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(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
}
/////////////////////////////////////////////////////////////////////////////
// CRoundSliderCtrl
IMPLEMENT_DYNAMIC(CRoundSliderCtrl, CSliderCtrl)
// 說 明：構造函數，負責初始化時的工作
//
CRoundSliderCtrl::CRoundSliderCtrl()
{
m_strText = "%ld";
m_nKnobRadius = 15;
m_nZero = 220;
m_bInverted = false;
m_bDragging = false;
m_bDragByKnobOnly = false;
m_bBitmap = FALSE;
m_bShowText = FALSE;
::GetObject((HFONT)GetStockObject(DEFAULT_GUI_FONT), sizeof(m_lf), &m_lf);
m_font.CreateFontIndirect(&m_lf);
m_crText = ::GetSysColor(COLOR_WINDOWTEXT);
m_hKnobBrush = ::CreateSolidBrush(::GetSysColor(COLOR_3DFACE));
m_hDialBrush = ::CreateSolidBrush(::GetSysColor(COLOR_3DFACE));
m_hActiveKnobBrush = ::CreateSolidBrush(::GetSysColor(COLOR_3DFACE));
m_hcCross = AfxGetApp()->LoadCursor( IDC_CURSOR );
}
// 說 明：析構函數不作任何事情
//
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()
ON_WM_MOUSEWHEEL()
ON_WM_SETCURSOR()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////
// 說 明：初始化函數，詳情參見 MSDN
//
void CRoundSliderCtrl::PreSubclassWindow()
{
CSliderCtrl::PreSubclassWindow();
SetRange(0, 359, FALSE);
SetLineSize(1);
SetPageSize(10);
Init();
}
// 說 明：當客戶區改變大小時進行完全初始化
// 該函數的詳細參數以及功能參見 MSDN；
//
void CRoundSliderCtrl::OnSize(UINT nType, int cx, int cy)
{
CSliderCtrl::OnSize(nType, cx, cy);
Init();
}
// 返回值：無
// 參 數：無
// 說 明：控件初始化函數，創建圓形區域
//
void CRoundSliderCtrl::Init()
{
CRect rc;
GetClientRect(rc);
// Resize the window to make it square
rc.bottom = rc.right = min(rc.bottom, rc.right);
// Get the vital statistics of the window
m_ptCenter = rc.CenterPoint();
m_nRadius = rc.bottom/2-(m_nKnobRadius+1);
// 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();
}
// SEE MSDN .........
//
#pragma warning(disable:4100) // Unreferenced formal parameter
BOOL CRoundSliderCtrl::OnEraseBkgnd(CDC* pDC)
{
return TRUE;
}
#pragma warning(default:4100)
// 說 明：該函數包含整個類中最為重要的處理部分，負責整個客戶區的繪畫工作
// 關于該函數的其他一些詳細內容，情參見MSDN
//
void CRoundSliderCtrl::OnPaint()
{
const int nMin = GetRangeMin();
const int nMax = GetRangeMax()+1;
const bool bDisabled = !IsWindowEnabled();
CPaintDC dc(this); // device context for painting
#ifdef USE_MEM_DC
CMemDC pDC(&dc);
#else
CDC* pDC = &dc;
#endif
int nRadius = m_nRadius;
//填充客戶區
CRect rc;
GetClientRect(rc);
pDC->SelectStockObject(NULL_BRUSH);
pDC->SelectStockObject(NULL_PEN);
pDC->FillSolidRect(rc, ::GetSysColor(COLOR_BTNFACE));
// 畫背景
if( m_bBitmap )
{
//位圖模式
CBitmap BitRoundBar;
BitRoundBar.LoadBitmap( m_uiBitID );
CBitmap * pOldBmp;
CDC memdc;
memdc.CreateCompatibleDC(pDC);
pOldBmp=memdc.SelectObject( &BitRoundBar );
BITMAP bm;
BitRoundBar.GetBitmap(&bm);
CRect rect;
GetClientRect(rect);
pDC->SetStretchBltMode( HALFTONE );
pDC->StretchBlt(0,0,rect.Width(),rect.Height(),&memdc,0,0,bm.bmWidth,bm.bmHeight,SRCCOPY);
memdc.SelectObject(pOldBmp);
memdc.DeleteDC();
BitRoundBar.DeleteObject();
}
else
{
//自畫模式
if(!bDisabled)
{
CBrush* pOldBrush = pDC->SelectObject(CBrush::FromHandle(m_hDialBrush));
pDC->Ellipse(m_ptCenter.x - nRadius + 1, m_ptCenter.y - nRadius + 1, m_ptCenter.x + nRadius + 1, m_ptCenter.y + nRadius + 1);
pDC->SelectObject(pOldBrush);
}
DrawCircle(pDC, m_ptCenter, nRadius--, ::GetSysColor(COLOR_3DHIGHLIGHT), ::GetSysColor(COLOR_3DDKSHADOW));
DrawCircle(pDC, m_ptCenter, nRadius--, ::GetSysColor(COLOR_3DLIGHT), ::GetSysColor(COLOR_3DSHADOW));
}
//計算指針應該存在的位置
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;
CPoint ptKnobCenter;
#pragma warning(disable:4244) // Disable warning "Converting 'double' to 'int', possible loss of data"
ptKnobCenter = CPoint(m_ptCenter.x + (nRadius-m_nKnobRadius) * sin(dPos), m_ptCenter.y - (nRadius-m_nKnobRadius) * cos(dPos));
#pragma warning(default:4244)
m_ptKnobCenter = ptKnobCenter;
nRadius += 2;
// 畫指針
int nKnobRadius = m_nKnobRadius;
nKnobRadius *= 4;
nKnobRadius /= 5;
const CRect rcKnob(ptKnobCenter.x - nKnobRadius + 2, ptKnobCenter.y - nKnobRadius + 2, ptKnobCenter.x + nKnobRadius, ptKnobCenter.y + nKnobRadius);
CRgn rgnKnob;
rgnKnob.CreateEllipticRgnIndirect(rcKnob);
//填充指針內部區域
if(bDisabled)
{
pDC->FillRgn(&rgnKnob, CBrush::FromHandle(::GetSysColorBrush(COLOR_BTNFACE)));
}
else
{
if( m_bDragging )
{
//鼠標按下
pDC->FillRgn(&rgnKnob, CBrush::FromHandle(m_hActiveKnobBrush));
}
else
{
pDC->FillRgn(&rgnKnob, CBrush::FromHandle(m_hKnobBrush));
}
}
rgnKnob.DeleteObject();
//畫指針邊緣區域
if( m_bDragging )
{
//當鼠按下
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_3DDKSHADOW), ::GetSysColor(COLOR_3DHIGHLIGHT));
DrawCircle(pDC, ptKnobCenter, --nKnobRadius, ::GetSysColor(COLOR_3DLIGHT), ::GetSysColor(COLOR_3DSHADOW));
pDC.MoveTo(m_ptCenter);
pDC.LineTo(ptKnobCenter);
}
// 畫指針焦點
if(!(GetFocus() == this))
{
DrawCircle(pDC, ptKnobCenter, nKnobRadius-2, RGB(0, 0, 0), TRUE);
}
// 畫滑塊內部的文字
if( m_bShowText )
{
const CString strFormattedText = OnFormatText();
if(!strFormattedText.IsEmpty())
{
CFont* pOldFont = pDC->SelectObject(&m_font);
const CSize szExtent = pDC->GetTextExtent(strFormattedText);
const CPoint ptText = CPoint(m_ptCenter.x - szExtent.cx/2, m_ptCenter.y - szExtent.cy/2);
const int nOldTextColor = pDC->SetTextColor(m_crText);
pDC->SetBkMode(TRANSPARENT);
if(bDisabled)
{
pDC->DrawState(ptText, szExtent, strFormattedText, DSS_DISABLED, TRUE, 0, (HBRUSH)NULL);
}
else
{
pDC->TextOut(ptText.x, ptText.y, strFormattedText);
}
// Clean up
pDC->SelectObject(pOldFont);
pDC->SetTextColor(nOldTextColor);
}
}
// Don't call CSliderCtrl::OnPaint()*/
}
// 說 明：按下鼠標后消息處理
// 關于該函數更加詳細的說明，請參見MSDN
//
void CRoundSliderCtrl::OnLButtonDown(UINT nFlags, CPoint point)
{
if(m_bDragByKnobOnly) //是否是指針僅跟著拖動
{
CPoint pt = m_ptKnobCenter - point;
if((pt.x*pt.x + pt.y*pt.y) > m_nKnobRadius*m_nKnobRadius) return; // Ignore it...
}
if(!m_bDragging)
{
m_bDragging = true; //置鼠標按下標志
m_bDragChanged = false; //指示器現在已經改變
SetCapture();
SetFocus();
if(SetKnob(point)) //計算位置，畫指針
{
m_bDragChanged = true;
PostMessageToParent(TB_THUMBTRACK);
}
RedrawWindow();
}
else
{
CSliderCtrl::OnLButtonDown(nFlags, point);
}
}
// 說 明：鼠標移動處理消息
// 關于該函數更加詳細的說明，請參見MSDN
//
void CRoundSliderCtrl::OnMouseMove(UINT nFlags, CPoint point)
{
if(m_bDragging)
{
//只有在鼠標按下后處理
if(SetKnob(point))
{
?? 快捷鍵說明
復制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號
Ctrl + =
減小字號
Ctrl + -