gradientstatic.cpp

非常难得的eMule(电骡) V0.45b 源码下载 值得研究

// GradientStatic.cpp : implementation file
//

#include "stdafx.h"
#include "GradientStatic.h"
#include <math.h>

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif


long l = 0;

/////////////////////////////////////////////////////////////////////////////
// CGradientStatic

CGradientStatic::CGradientStatic()
{
	m_bInit = TRUE;
	m_bHorizontal = TRUE;
	m_bInvert = FALSE;

	m_crColorLB = RGB(0,0,0);
	m_crColorRT = RGB(255,255,255);
	m_crTextColor = RGB(127,127,127);
}

CGradientStatic::~CGradientStatic()
{
	if(m_Mem.dc.GetSafeHdc() && m_Mem.pold)
		m_Mem.dc.SelectObject(m_Mem.pold);
	if(m_Mem.bmp.GetSafeHandle())
		m_Mem.bmp.DeleteObject();
	if(m_Mem.dc.GetSafeHdc())
		m_Mem.dc.DeleteDC();
}


BEGIN_MESSAGE_MAP(CGradientStatic, CStatic)
	//{{AFX_MSG_MAP(CGradientStatic)
	ON_WM_PAINT()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CGradientStatic message handlers

void CGradientStatic::OnPaint() 
{
	CPaintDC dc(this); // device context for painting
	
	CRect rClient;
	GetClientRect(rClient);
	
	if(m_bInit)
	{		
		CreateGradient(&dc, &rClient);
		m_bInit = false;
	}

	dc.BitBlt(0,0,m_Mem.cx, m_Mem.cy, &m_Mem.dc, 0,0, SRCCOPY);
}

void CGradientStatic::CreateGradient(CDC *pDC, CRect *pRect)
{
	m_Mem.cx = pRect->Width();
	m_Mem.cy = pRect->Height();

	if(m_Mem.dc.GetSafeHdc())
	{	
		if(m_Mem.bmp.GetSafeHandle() && m_Mem.pold)
			m_Mem.dc.SelectObject(m_Mem.pold);
		m_Mem.dc.DeleteDC();
	}
	m_Mem.dc.CreateCompatibleDC(pDC);
	
	if(m_Mem.bmp.GetSafeHandle())
		m_Mem.bmp.DeleteObject();
	m_Mem.bmp.CreateCompatibleBitmap(pDC, m_Mem.cx, m_Mem.cy);

	m_Mem.pold = m_Mem.dc.SelectObject(&m_Mem.bmp);

//-----------------------------------------------------------------

	if(m_bHorizontal)
	{
		DrawHorizontalGradient();
		DrawHorizontalText(pRect);
	}
	else
	{
		DrawVerticalGradient();
		DrawVerticalText(pRect);		
	}
}

void CGradientStatic::DrawHorizontalGradient()
{
	double dblRstep = (GetRValue(m_crColorRT) - GetRValue(m_crColorLB)) / static_cast<double>(m_Mem.cx);
	double dblGstep = (GetGValue(m_crColorRT) - GetGValue(m_crColorLB)) / static_cast<double>(m_Mem.cx);
	double dblBstep = (GetBValue(m_crColorRT) - GetBValue(m_crColorLB)) / static_cast<double>(m_Mem.cx);
	double r = GetRValue(m_crColorLB);
	double g = GetGValue(m_crColorLB);
	double b = GetBValue(m_crColorLB);

	for(int x = 0; x < m_Mem.cx; x++)
	{
		CPen Pen(PS_SOLID, 1, RGB(r,g,b));
		CPen* pOld = m_Mem.dc.SelectObject(&Pen);
		m_Mem.dc.MoveTo(x,0);
		m_Mem.dc.LineTo(x,m_Mem.cy);
		m_Mem.dc.SelectObject(pOld);

		r += dblRstep;
		g += dblGstep;
		b += dblBstep;
	}
}

void CGradientStatic::DrawVerticalGradient()
{
	double dblRstep = (GetRValue(m_crColorLB) - GetRValue(m_crColorRT)) / static_cast<double>(m_Mem.cy);
	double dblGstep = (GetGValue(m_crColorLB) - GetGValue(m_crColorRT)) / static_cast<double>(m_Mem.cy);
	double dblBstep = (GetBValue(m_crColorLB) - GetBValue(m_crColorRT)) / static_cast<double>(m_Mem.cy);
	double r = GetRValue(m_crColorRT);
	double g = GetGValue(m_crColorRT);
	double b = GetBValue(m_crColorRT);

	for(int y = 0; y < m_Mem.cy; y++)
	{
		CPen Pen(PS_SOLID, 1, RGB(r,g,b)), *pOld;
		pOld = m_Mem.dc.SelectObject(&Pen);
		m_Mem.dc.MoveTo(0,y);
		m_Mem.dc.LineTo(m_Mem.cx,y);
		m_Mem.dc.SelectObject(pOld);

		r += dblRstep;
		g += dblGstep;
		b += dblBstep;
	}
}

void CGradientStatic::DrawHorizontalText(CRect *pRect)
{
	CFont *pOldFont = NULL;
	if (m_cfFont.GetSafeHandle())
		pOldFont = m_Mem.dc.SelectObject(&m_cfFont);
	
	CString strText;
	GetWindowText(strText);

	m_Mem.dc.SetTextColor(m_crTextColor);
	m_Mem.dc.SetBkMode(TRANSPARENT);
	m_Mem.dc.DrawText(strText, pRect, DT_LEFT|DT_SINGLELINE|DT_VCENTER|DT_END_ELLIPSIS);
	if (pOldFont)
		m_Mem.dc.SelectObject(pOldFont);
}

void DrawRotatedText(HDC hdc, LPCTSTR str, LPRECT rect, double angle, UINT nOptions = 0)
{
   // convert angle to radian
   double pi = 3.141592654;
   double radian = pi * 2 / 360 * angle;

   // get the center of a not-rotated text
   SIZE TextSize;;
   GetTextExtentPoint32(hdc, str, _tcslen(str), &TextSize);

   POINT center;
   center.x = TextSize.cx / 2;
   center.y = TextSize.cy / 2;

   // now calculate the center of the rotated text
   POINT rcenter;
   rcenter.x = long(cos(radian) * center.x - sin(radian) * center.y);
   rcenter.y = long(sin(radian) * center.x + cos(radian) * center.y);

   // finally draw the text and move it to the center of the rectangle
   SetTextAlign(hdc, TA_BOTTOM);
   SetBkMode(hdc, TRANSPARENT);
   ExtTextOut(hdc, rect->left + (rect->right - rect->left) / 2 - rcenter.x,
              rect->bottom, nOptions, rect, str, _tcslen(str), NULL);
}

void CGradientStatic::DrawVerticalText(CRect *pRect)
{	
	CFont *pOldFont = NULL;;

	LOGFONT lfFont;
	if(m_cfFont.GetSafeHandle())
	{	
		m_cfFont.GetLogFont(&lfFont);
	}
	else
	{	
		CFont *pFont = GetFont();
		pFont->GetLogFont(&lfFont);
		_tcscpy(lfFont.lfFaceName, _T("Arial"));	// some fonts won't turn :(
	}
	lfFont.lfEscapement = 900;
	
	CFont Font;
	Font.CreateFontIndirect(&lfFont);
	pOldFont = m_Mem.dc.SelectObject(&Font);

	CString strText;
	GetWindowText(strText);

	m_Mem.dc.SetTextColor(m_crTextColor);
	m_Mem.dc.SetBkColor(TRANSPARENT);
	CRect rText = pRect;
	rText.bottom -= 5;
	DrawRotatedText(m_Mem.dc.m_hDC, strText, rText, 90);
	
	m_Mem.dc.SelectObject(pOldFont);
}	

void CGradientStatic::SetFont(CFont *pFont)
{
	LOGFONT lfFont;
	pFont->GetLogFont(&lfFont);

	if(m_cfFont.GetSafeHandle())
		m_cfFont.DeleteObject();
	m_cfFont.CreateFontIndirect(&lfFont);
}