public partial class Form1 : Form
{
System.Windows.Forms.Timer timer = new System.Windows.Forms.Timer() { Interval = 200};
List<PointF> points = new List<PointF>();
public Form1()
{
InitializeComponent();
this.DoubleBuffered = true;
this.timer.Tick += (o, e) => this.Invalidate();
this.timer.Start();
}
protected override void OnPaint(PaintEventArgs e)
{
if (points.Count < 100)
{
int t = points.Count + 1;
float x = t * (float)Math.Cos(t / 5f);
float y = t * (float)Math.Sin(t / 5f);
PointF p = new PointF(this.ClientRectangle.Width / 2 + x, this.ClientRectangle.Height / 2 + y);
points.Add(p);
}
if (points.Count > 2)
{
e.Graphics.DrawCurve(Pens.Blue, points.ToArray());
}
}
}
上楼是螺线，如果是‘圆的渐开线’，则公式为(http://zh./wiki/%E6%BC%B8%E4%BC%B8%E7%B7%9A)：
x = cos(t) + t * sin(t);y = sin(t) - t * cos(t);
