using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
namespace WindowsFormsApplication2{
public partial class Form1 : Form {
private string strColor;
public Form1() { InitializeComponent(); }
private void Form1_Paint(
object sender, PaintEventArgs e) { Graphics g = e.Graphics; g.FillRectangle(Brushes.White,
this.ClientRectangle);
//report dimensions of clipping rectangle to console Console.WriteLine(
"e.ClipRectangle = " + e.ClipRectangle);
//draw outline g.FillRectangle(Brushes.Black,
10,
10,
50,
150); g.DrawEllipse(Pens.White,
15,
15,
40,
40); g.DrawEllipse(Pens.White,
15,
60,
40,
40); g.DrawEllipse(Pens.White,
15,
105,
40,
40);
//use application state to draw exactly one of three lights switch(strColor) {
case "red": g.FillEllipse(Brushes.Red,
15,
15,
40,
40);
break;
case "yellow": g.FillEllipse(Brushes.Yellow,
15,
60,
40,
40);
break;
case "green": g.FillEllipse(Brushes.Green,
15,
105,
40,
40);
break;
default: g.FillEllipse(Brushes.Red,
15,
15,
40,
40);
break; } }
private void Form1_Click(
object sender, EventArgs e) {
//change application state by altering value of strColor switch(strColor) {
case "red": strColor =
"yellow";
break;
case "yellow": strColor =
"green";
break;
default: strColor =
"red";
break; }
//invaliate the region containing the traffics lights this.Invalidate(
new Rectangle(
10,
10,
50,
150));
//request an update this.Update(); } }}
转载于:https://www.cnblogs.com/ttssrs/archive/2012/03/14/2396526.html
相关资源：C#做的模拟红绿灯程序
