C#:画许多圆
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Test_21
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
Random random = new Random();
Color getRandmColor()
{
return Color.FromArgb(
random.Next(256),
random.Next(256),
random.Next(256));
}
private void button1_Click(object sender, EventArgs e)
{
Graphics g = this.CreateGraphics();
int x0 = this.Width / 2;
int y0 = this.Height / 2;
for(int r = 0; r < this.Height / 2; r++)
{
g.DrawEllipse(
new Pen(getRandmColor(), 1),
x0 - r, y0 - r, r * 2, r * 2
);
}
}
}
}
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