急！如何划带箭头的直线（任意方向的）

[jupiter_lwm]

[A_Qiao]

http://www.codeguru.com/gdi/Arrow.html

[ccnuxjg]

我也在http://www.codeguru.com/gdi
上看到了，去那吧

[Happy_Wawe]

计算点，然后再画。

[pipinu]

CDC *pDC;
pDC->MoveTo(x1,y1);
pDC->LineTo(x2,y2);
pDC->MoveTo(x1,y1);
pDC->LineTo(x1+(int)(ARROWSIZE*cos(alfa+15*pi/180)),y1-(int)(ARROWSIZE*sin(alfa+15*pi/180)));
pDC->MoveTo(x1,y1);
pDC->LineTo(x1+(int)(ARROWSIZE*cos(alfa-15*pi/180)),y1-(int)(ARROWSIZE*sin(alfa-15*pi/180)));
pDC->MoveTo(x2,y2);
pDC->LineTo(x2+(int)(ARROWSIZE*cos(alfa+15*pi/180-pi)),y2-(int)(ARROWSIZE*sin(alfa+15*pi/180-pi)));
pDC->MoveTo(x2,y2);
pDC->LineTo(x2+(int)(ARROWSIZE*cos(alfa-15*pi/180-pi)),y2-(int)(ARROWSIZE*sin(alfa-15*pi/180-pi)));
其中alfa为任意直线段与x轴的夹角

[snlee]

study