已知两端点, 画工字线

已知两端点, 画工字线
如图所示
p1, p2

double dHead = 10;// 工字头的半长double dLen = sqrt(double((p1.x - p2.x) * (p1.x - p2.x) + (p1.y - p2.y) * (p1.y - p2.y)));intnX = (int)((p1.y - p2.y) * dHead / dLen + 0.5);int nY = (int)((p1.x - p2.x) * dHead / dLen + 0.5);pDC->MoveTo(p1.x - nX, p1.y + nY);pDC->LineTo(p1.x + nX, p1.y - nY);pDC->MoveTo(p2.x - nX, p2.y + nY);pDC->LineTo(p2.x + nX, p2.y - nY);