c# 实现雪花分形的示例

C#都没人用了吗,网上想找个现成的雪花分形代码,都没找见,有C++,有python,有java的,就没有C#的,自己试试写一个吧。

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private void Form1_Paint(object sender, PaintEventArgs e)

{

DrawKochSnow(e.Graphics);

}

private void ZheXian(Point p1, Point p2, Graphics g) // 4条基本线段组成的折线

{

Point p3 = new Point(p1.X + (p2.X - p1.X) / 3, p1.Y + (p2.Y - p1.Y) / 3); // 三等分点坐标

Point p4 = new Point(p1.X + (p2.X - p1.X) * 2 / 3, p1.Y + (p2.Y - p1.Y) * 2 / 3); // 三等分点坐标

Point p4XD3 = new Point(p4.X - p3.X, p4.Y - p3.Y); // p4相对于p3点的坐标

//int x = (int)(p4XD3.X * Math.Cos(Math.PI / 3) - p4XD3.Y * Math.Sin(Math.PI / 3));

//int y = (int)(p4XD3.X * Math.Sin(Math.PI / 3) + p4XD3.Y * Math.Cos(Math.PI / 3));

// 注意计算机的屏幕垂直坐标和数学上相反,所以数学上逆时针旋转在计算机上相当于顺时针旋转

int x = (int)Math.Round(p4XD3.X * Math.Cos(Math.PI / 3) + p4XD3.Y * Math.Sin(Math.PI / 3));

int y = (int)Math.Round(p4XD3.Y * Math.Cos(Math.PI / 3) - p4XD3.X * Math.Sin(Math.PI / 3));

Point p5XD3 = new Point(x, y); // 凸起点p5相对于p3点的坐标

Point p5 = new Point(p3.X + x, p3.Y + y); // p5相对于原点的坐标

Pen pen = new Pen(Brushes.Black, 1);

double length = Math.Sqrt(Math.Pow(p2.X - p1.X, 2) + Math.Pow(p2.Y - p1.Y, 2)) / 3;

//Console.WriteLine(length);

if (length > 20) // 通过最终线段长度可以控制迭代

{

ZheXian(p1, p3, g);

ZheXian(p3, p5, g);

ZheXian(p5, p4, g);

ZheXian(p4, p2, g);

}

else

{

g.DrawLine(pen, p1, p3);

g.DrawLine(pen, p3, p5);

g.DrawLine(pen, p5, p4);

g.DrawLine(pen, p4, p2);

}

}

private void DrawKochSnow(Graphics g) // 科赫雪花(瑞典人科赫于1904年提出了著名的“雪花”曲线)

{

int length = 480;

Point origin = new Point(this.ClientSize.Width / 2, this.ClientSize.Height / 2);

g.FillEllipse(Brushes.Blue, new RectangleF(origin, new Size(10, 10)));

// 计算三角形的顶点让其中心和窗体的中心重合

Point A = new Point(origin.X - length / 2, (int)(origin.Y + length / (2 * Math.Sqrt(3))));

Point B = new Point(origin.X, (int)(origin.Y - length / Math.Sqrt(3)));

Point C = new Point(origin.X + length / 2, (int)(origin.Y + length / (2 * Math.Sqrt(3))));

ZheXian(A, B, g);

ZheXian(B, C, g);

ZheXian(C, A, g);

}

}

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