用三点绘制弧线..？ [英] Drawing an arc with three points ..?

问题描述

用三点绘制弧线.. ??

帮我找到这个..







private void Form1_MouseDown（object sender，MouseEventArgs e）

{

Graphics gs = this.CreateGraphics（）;



if（pt [0] .X == 0 && pt [0] .Y == 0）

{



pt [0] .X = eX;

pt [0] .Y = eY;

}

else if（pt [1] .X == 0 && pt [1] .Y == 0）

{



pt [1] .X = eX;

pt [1] .Y = eY;

}

else if（pt [2] .X == 0 && pt [2] .Y == 0）

{



pt [2] .X = eX;

pt [2] .Y = eY;



double dstart = Math.Atan2（pt [0] .Y - pt [1 ] .Y，pt [0] .X - pt [1] .X）* Rad2Deg;







double dEnd = Math.Atan2（pt [0] .Y - pt [2] .Y，pt [0 ] .X - pt [2] .X）* Rad2Deg;



double dSweep = dEnd - dstart;



PointF pMid =新的PointF（（pt [0] .X + pt [2] .X）/ 2，（pt [0] .Y + pt [2] .Y）/ 2）;



double a = pMid.X - pt [0] .X;

double b = pMid.Y - pt [0] .Y;

double radius = Math.Sqrt（a * a + b * b）;



double a1 = pMid.X - pt [1]。 X;

double b1 = pMid.Y - pt [1] .Y;

double radius1 = Math.Sqrt（a1 * a1 + b1 * b1）;







gs.DrawArc（Pens.Black，pt [0] .X，pt [0]。 Y，Convert.ToInt32（radius * 2），Convert.ToInt32（radius1），Convert.ToInt32（dstart），Convert.ToInt32（dSweep））;



< br $>
}

}

Drawing an arc with three points ..??
Help me to find this..



private void Form1_MouseDown(object sender, MouseEventArgs e)
{
Graphics gs = this.CreateGraphics();

if (pt[0].X == 0 && pt[0].Y == 0)
{

pt[0].X = e.X;
pt[0].Y = e.Y;
}
else if (pt[1].X == 0 && pt[1].Y == 0)
{

pt[1].X = e.X;
pt[1].Y = e.Y;
}
else if (pt[2].X == 0 && pt[2].Y == 0)
{

pt[2].X = e.X;
pt[2].Y = e.Y;

double dstart = Math.Atan2(pt[0].Y - pt[1].Y, pt[0].X - pt[1].X) * Rad2Deg;



double dEnd = Math.Atan2(pt[0].Y - pt[2].Y, pt[0].X - pt[2].X) * Rad2Deg;

double dSweep = dEnd - dstart;

PointF pMid = new PointF((pt[0].X + pt[2].X) / 2, (pt[0].Y + pt[2].Y) / 2);

double a = pMid.X - pt[0].X;
double b = pMid.Y - pt[0].Y;
double radius = Math.Sqrt(a * a + b * b);

double a1 = pMid.X - pt[1].X;
double b1 = pMid.Y - pt[1].Y;
double radius1 = Math.Sqrt(a1 * a1 + b1 * b1);



gs.DrawArc(Pens.Black, pt[0].X, pt[0].Y, Convert.ToInt32(radius * 2), Convert.ToInt32(radius1), Convert.ToInt32(dstart), Convert.ToInt32(dSweep));


}
}

解决方案

使用 Graphics.DrawCurve方法 [ ^ ]

hi，



参考这个



http://stackoverflow.com/questions/2898089/c-sharp -drawing-arc-with-3-points [ ^ ]



谢谢

Magesh M

hi ,

Refer this

http://stackoverflow.com/questions/2898089/c-sharp-drawing-arc-with-3-points[^]

Thanks
Magesh M

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