c++ - 如何设置方边线api窗口

Question

我在windows（不是gdi）上使用api，我想知道如何做方边线。

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

我当前的线路输出：

我想要这条线：

谢谢，有代码

Answer 1

您可以修改用于绘制线条的笔样式，特别PS_ENDCAP_SQUARE是将该笔选择到设备上下文中，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);

Answer 2

那个工作！谢谢 ！请参阅以下代码：

         LOGBRUSH logBrush;
         logBrush.lbStyle = BS_SOLID;
         logBrush.lbColor = RGB(R,G,B);
         HPEN border = ExtCreatePen(PS_GEOMETRIC | PS_ENDCAP_SQUARE | PS_SOLID | PS_JOIN_MITER, size_, &logBrush, 0, nullptr);

         SelectObject(hdc, border);
         MoveToEx(hdc, x1, y1, nullptr);
         LineTo(hdc, x2, y2);

         DeleteObject(border);