c#画平行线和垂线的代码

参考如下绘制平行线的代码
private Point downPoint = Point.Empty; // 鼠标按下的坐标
private Point movePoint = Point.Empty; // 鼠标移动的坐标
private double lineSpace = 12.0f; // 线条之间的距离
private Point offsetPointA = Point.Empty; // 偏移坐标A
private Point offsetPointB = Point.Empty; // 偏移坐标B

private double PointToAngle(Point AOrigin, Point APoint)
{if (APoint.X == AOrigin.X)if (APoint.Y > AOrigin.Y)return Math.PI * 0.5f;else return Math.PI * 1.5f;else if (APoint.Y == AOrigin.Y)if (APoint.X > AOrigin.X)return 0;else return Math.PI;else{double Result = Math.Atan((double)(AOrigin.Y - APoint.Y) /(AOrigin.X - APoint.X));if ((APoint.X < AOrigin.X) && (APoint.Y > AOrigin.Y))return Result + Math.PI;else if ((APoint.X < AOrigin.X) && (APoint.Y < AOrigin.Y))return Result + Math.PI;else if ((APoint.X > AOrigin.X) && (APoint.Y < AOrigin.Y))return Result + 2 * Math.PI;else return Result;}
} /* PointToAngle */

private void Form1_MouseDown(object sender, MouseEventArgs e)
{downPoint = e.Location;
}

private void Form1_MouseMove(object sender, MouseEventArgs e)
{if (downPoint != Point.Empty){Graphics vGraphics = CreateGraphics();if (movePoint != Point.Empty){vGraphics.DrawLine(new Pen(BackColor), offsetPointA,new Point(movePoint.X + offsetPointA.X - downPoint.X,movePoint.Y + offsetPointA.Y - downPoint.Y));vGraphics.DrawLine(new Pen(BackColor), offsetPointB,new Point(movePoint.X + offsetPointB.X - downPoint.X,movePoint.Y + offsetPointB.Y - downPoint.Y));vGraphics.DrawLine(new Pen(BackColor), downPoint, movePoint);}movePoint = e.Location;double angle = PointToAngle(downPoint, movePoint);offsetPointA.X = (int)(Math.Cos(angle + 0.5f * Math.PI) * lineSpace + downPoint.X);offsetPointA.Y = (int)(Math.Sin(angle + 0.5f * Math.PI) * lineSpace + downPoint.Y);offsetPointB.X = (int)(Math.Cos(angle - 0.5f * Math.PI) * lineSpace + downPoint.X);offsetPointB.Y = (int)(Math.Sin(angle - 0.5f * Math.PI) * lineSpace + downPoint.Y);vGraphics.DrawLine(Pens.Red, offsetPointA, new Point(movePoint.X + offsetPointA.X - downPoint.X,movePoint.Y + offsetPointA.Y - downPoint.Y));vGraphics.DrawLine(Pens.Red, offsetPointB,new Point(movePoint.X + offsetPointB.X - downPoint.X,movePoint.Y + offsetPointB.Y - downPoint.Y));        vGraphics.DrawLine(Pens.Blue, downPoint, movePoint);vGraphics.Dispose();}
}

private void Form1_MouseUp(object sender, MouseEventArgs e)
{downPoint = Point.Empty;
}
垂线的代码只要参照如上代码将角度旋转90度即可

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