c++ - 如何设置方边线api窗口

Question

我在 Windows 上使用 api(不是 gdi)，我想知道如何做方形边缘线。

MoveToEx(hdc, x1, y1, NULL);
LineTo(hdc, x2, y2);

我当前的行输出:

我想要这一行:

谢谢，有代码

Answer 1

您可以修改用于绘制线条的笔样式，特别是 PS_ENDCAP_SQUARE 并在设备上下文中选择该笔，请阅读 CPen 的文档:

 LOGBRUSH logBrush;//you need to use LOGBRUSH structure to specifiy brush attributes of the pen when the pen has PS_GEOMETRIC style
 logBrush.lbStyle = BS_SOLID;
 logBrush.lbColor = RGB(255,0,0);
 CPen pen( PS_GEOMETRIC |  PS_ENDCAP_SQUARE,10,&logBrush);//creates a pen with a square end caps and width of 10 pixels

 SelectObject(hdc,pen.GetSafeHandle());//select the above pen into the device context
 MoveToEx(hdc,x1,y1,NULL);
 LineTo(hdc,x2,y2);