1、 打开stdafx.h头文件,添加头文件和库。
#pragma comment( lib, "gdiplus.lib" )
#include "gdiplus.h"
using namespace Gdiplus;
2、在CXXWinApp::InitInstance()函数内加载GDI
//加载GDI+
GdiplusStartupInput gdiplusStartupInput;
GdiplusStartup(&m_gdiplusToken, &gdiplusStartupInput, NULL);
3、记得要在CXXWinApp::ExitInstance( )函数内关闭GDI
//关闭GDI+
GdiplusShutdown(m_gdiplusToken);
4、在你需要绘图的地方调用Graphics即可,如下面例子
//平滑曲线
Graphics graphics(pDC->m_hDC);
graphics.SetPageUnit(UnitPixel);
graphics.TranslateTransform(0,(mywaverect.top + mywaverect.bottom)/2);
graphics.SetSmoothingMode(SmoothingModeAntiAlias);
Pen pen1(Color(GetRValue(m_clWave),GetGValue(m_clWave),GetBValue(m_clWave)),
m_nWaveLineWidth * ratio/(g_nWaveLine+1));
pen1.SetDashStyle(DashStyle::DashStyleSolid);
PointF pt1,pt2;
for(int i=0;i<nShowPt;i++)
{
pt2.X=i*pixpervaluex;
pt2.Y=-(m_pfData[i]*pixpervaluey);
if(i>0)
graphics.DrawLine(&pen1,pt1,pt2);
pt1=pt2;
}
graphics.TranslateTransform(0,0);
graphics.ReleaseHDC(pDC->m_hDC);