求一个算发2 求一个算发: 一条直线和圆的交点坐标,圆是可以移动的. 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 //参考如下代码private double PointToAngle(Point AOrigin, Point APoint) // 取得两点的角度{ if (APoint.X == AOrigin.X) if (APoint.Y > AOrigin.Y) return Math.PI * 0.5; else return Math.PI * 1.5; 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 *///求圆外一点到圆心的直线与圆的交点private Point PointXCircle(Point APoint, Point AOrigin, int ARadial){ //圆外一点 圆心坐标 半径 double vAngle = PointToAngle(AOrigin, APoint); return new Point((int)(AOrigin.X + Math.Cos(vAngle) * ARadial), (int)(AOrigin.Y + Math.Sin(vAngle) * ARadial));}private void button1_Click(object sender, EventArgs e){ Random vRandom = new Random(); int vRadialA = vRandom.Next(100); Rectangle vRectangleA = new Rectangle( vRandom.Next(ClientSize.Width), vRandom.Next(ClientSize.Height), vRadialA * 2, vRadialA * 2); int vRadialB = vRandom.Next(100); Rectangle vRectangleB = new Rectangle( vRandom.Next(ClientSize.Width), vRandom.Next(ClientSize.Height), vRadialB * 2, vRadialB * 2); Graphics vGraphics = CreateGraphics(); vGraphics.DrawEllipse(Pens.Red, vRectangleA); vGraphics.DrawEllipse(Pens.Green, vRectangleB); Point vCenterA = vRectangleA.Location; vCenterA.Offset(vRectangleA.Width / 2, vRectangleA.Height / 2); Point vCenterB = vRectangleB.Location; vCenterB.Offset(vRectangleB.Width / 2, vRectangleB.Height / 2); Point vFringeA = PointXCircle(vCenterA, vCenterB, vRadialB); Point vFringeB = PointXCircle(vCenterB, vCenterA, vRadialA); vGraphics.DrawLine(Pens.Blue, vFringeA, vFringeB); vGraphics.Dispose();} winform连接sql数据库 请教如何创建一个DBF文件? 我不会这个,提个很简单的问题.大虾请进! Remoting服务端配置文件中能设置 远程客户端和本地客户端同时访问的IP吗? 如何在 RichTextBox 既显示 文本又显示 图片? C#问题,有截图 XmlDataDocument的问题. 怎样将数据库打包到安装程序? 怎样在C#网页中实现对JAVA程序的时时更新? C# SqlDataAdapter 填充 DataSet 忽快忽慢的问题 看不太明白,請大家幫忙解釋一下這個代碼 急!!mailto: 中不能使用#号吗?怎么解决?
{
if (APoint.X == AOrigin.X)
if (APoint.Y > AOrigin.Y)
return Math.PI * 0.5;
else return Math.PI * 1.5;
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 *///求圆外一点到圆心的直线与圆的交点
private Point PointXCircle(Point APoint, Point AOrigin, int ARadial)
{ //圆外一点 圆心坐标 半径
double vAngle = PointToAngle(AOrigin, APoint);
return new Point((int)(AOrigin.X + Math.Cos(vAngle) * ARadial),
(int)(AOrigin.Y + Math.Sin(vAngle) * ARadial));
}private void button1_Click(object sender, EventArgs e)
{
Random vRandom = new Random();
int vRadialA = vRandom.Next(100);
Rectangle vRectangleA = new Rectangle(
vRandom.Next(ClientSize.Width),
vRandom.Next(ClientSize.Height),
vRadialA * 2, vRadialA * 2);
int vRadialB = vRandom.Next(100);
Rectangle vRectangleB = new Rectangle(
vRandom.Next(ClientSize.Width),
vRandom.Next(ClientSize.Height),
vRadialB * 2, vRadialB * 2);
Graphics vGraphics = CreateGraphics();
vGraphics.DrawEllipse(Pens.Red, vRectangleA);
vGraphics.DrawEllipse(Pens.Green, vRectangleB);
Point vCenterA = vRectangleA.Location;
vCenterA.Offset(vRectangleA.Width / 2, vRectangleA.Height / 2);
Point vCenterB = vRectangleB.Location;
vCenterB.Offset(vRectangleB.Width / 2, vRectangleB.Height / 2);
Point vFringeA =
PointXCircle(vCenterA, vCenterB, vRadialB);
Point vFringeB =
PointXCircle(vCenterB, vCenterA, vRadialA);
vGraphics.DrawLine(Pens.Blue, vFringeA, vFringeB);
vGraphics.Dispose();
}