using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Windows.Forms;
class Form1 : Form {
private int lightColor = 1;
public Form1() {
InitializeComponent();
}
private void Form1_Paint(object sender, PaintEventArgs e) {
Graphics g = e.Graphics;
g.FillRectangle(Brushes.White, this.ClientRectangle);
Rectangle r = new Rectangle(10, 10, 60, 180);
g.FillRectangle(Brushes.LightGray, r);
Rectangle r1 = new Rectangle(10, 10, 60, 60);
Rectangle r2 = new Rectangle(10, 70, 60, 60);
Rectangle r3 = new Rectangle(10, 130, 60, 60);
switch (lightColor) {
case 1:
g.FillEllipse(Brushes.Red, r1);
g.FillEllipse(Brushes.Black, r2);
g.FillEllipse(Brushes.Black, r3);
break;
case 2:
g.FillEllipse(Brushes.Black, r1);
g.FillEllipse(Brushes.Yellow, r2);
g.FillEllipse(Brushes.Black, r3);
break;
case 3:
g.FillEllipse(Brushes.Black, r1);
g.FillEllipse(Brushes.Black, r2);
g.FillEllipse(Brushes.Green, r3);
break;
}
}
private void Form1_Click(object sender, EventArgs e) {
lightColor++;
if (lightColor == 4)
lightColor = 1;
this.Invalidate();
}
private void InitializeComponent() {
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 271);
this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
this.Click += new System.EventHandler(this.Form1_Click);
}
[STAThread]
static void Main() {
Application.EnableVisualStyles();
Application.Run(new Form1());
}
}
