GDI+学习笔记(1)

      GDI+在画刷方面对gdi进行了功能上的扩展,他支持线形渐变和渐变画刷,可以填充图形,路径和区域.渐变画刷同时还可以用于绘制直线,曲线和路径.因此,可以用一个路径来设置渐变颜色.在vc++.net2005中使用gdi+,首先,需要在stafx.h中包括<gdiplus.h>头文件,然后在属性中->连接器->附加引用库添加gdiplus.lib文件.然后在应用程序中的oninitapplication(),初始化Gdiplus设备,代码如下:
        using namespace Gdiplus;
        GdiplusStartupInput ginput;
        GdiplusStartup(&m_gdiplusToken,&ginput,NULL);
        当应用程序退出之后，要在ExitInstance中添加以下函数:
        using namespace Gdiplus;
        GdipusShutdown(m_gdiplusToken);
        接下来,就可以使用GDI+了.在OnDraw里添加以下代码
        using namespace Gdiplus;
        Graphics g(pDC->m_hDC);
        Point points[] = Point points[] = {Point(75,0),Point(100,50),Point(150,40),Point(112,75),
   Point(150,150),Point(75,100),Point(0,150),Point(47,75),Point(0,50),Point(50,50)};
        GraphicsPath path;
        path.AddLines(points,10);
        PathGradientBrush pgBrush(&path);

        pgBrush.SetCenterColor(Color(255,255,0,0));
        
        Color colors[] = {Color(255,0,0,0),Color(255,0,255,0),
     Color(255,0,0,2555),Color(255,255,255,255),
     Color(255,0,0,0),Color(255,0,255,0),
     Color(255,0,0,255),Color(255,255,255,255),
     Color(255,0,0,0),Color(255,0,255,0)};
        int count = 10;
        pgBrush.SetSurroundColors(colors,&count);
        g.FillPath(&pgBrush,&path);