[VC]GDI+繪圖

上次寫了一個GDI+做漸層效果，今天要再用就忘了一些步驟，所以把整個流程寫上來。

Step1.在stdafx.h中加入GDI+的Header file

#include <gdiplus.h>
using namespace Gdiplus;
#pragma comment(lib, "gdiplus.lib")

Step2.在CWinApp中加入成員變數

GdiplusStartupInput gdiplusStartupInput;
ULONG_PTR gdiplusToken;
在CWinApp::InitInstance()中初始化GDI+資源

GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

Step3.至此，你的程式即可開始使用GDI+囉~

Step4.程式結束前，需釋放GDI+資源，請在CWinApp::ExitInstance()中加入:

GdiplusShutdown(gdiplusToken);

以小弟需求來說--->漸層<---以下程式碼請參考:
/*****MyClass.h*****/
class CMyClass:public CWnd
{
DECLARE_DYNAMIC(CMyClass)
public:
 CMyClass();
 virtual ~CMyClass();  

protected:
 afx_msg void OnPaint();
 
private:
 Gdiplus::PointF  m_gdiPoint1,m_gdiPoint2;
 Gdiplus::Color  m_gdiColor1,m_gdiColor2;
};

/*****MyClass.cpp*****/
CMyClass::CMyClass()
{
 vm_gdiPoint1 =PointF(0,0);
 vm_gdiPoint2 =PointF(0,18);
 vm_gdiColor1 =Color(255,255,255);
 vm_gdiColor2 =Color(0,0,0);
}

void CMyClass::OnPaint()
{
 CPaintDC dc(this);
 CRect rcBar;
 GetClientRect(&rcBar);
 //GDI+
 Gdiplus::LinearGradientBrush  gdiBrush(m_gdiPoint1,m_gdiPoint2,m_gdiColor1,m_gdiColor2);
 Gdiplus::RectF gdiRc((Gdiplus::REAL)rcBar.left,(Gdiplus::REAL)rcBar.top, (Gdiplus::REAL)rcBar.Width(),(Gdiplus::REAL)rcBar.Height());
 Graphics grThis(dc.m_hDC);
 grThis.FillRectangle( &gdiBrush, gdiRc);
}

ref:CodeProject_GDI+
ref:MSDN_GDI+