namespace winapp
{
public partial class Form4 : Form
{
public Form4()
{
InitializeComponent();
}
private void Form4_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
Graphics g = e.Graphics;
g.DrawString("circle 99", this.Font, new SolidBrush(Color.Blue), 20, 20);
int x0 = this.Width / 2;
int y0 = this.Height / 2;
for (int r = 0; r < this.Height / 2; r += 3)
{
g.DrawEllipse(new Pen(getRandomColor(), 1), x0 - r, y0 - r, r * 2, r * 2);
}
}
private Color getRandomColor()
{
Random rnd = new Random();
return Color.FromArgb(rnd.Next(255), rnd.Next(255), rnd.Next(255));
}
}
}
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