form1.cs

JAVA实例,画图功能强大,

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace DoubleBuffer
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            Graphics g = e.Graphics;
            Random r = new Random();

            g.FillRectangle(Brushes.White, ClientRectangle);

            for(int x = 0; x < ClientRectangle.Width; x++)
            {
                for(int y = 0; y < ClientRectangle.Height; y += 10)
                {
                    Color c = Color.FromArgb(r.Next(255), r.Next(255), r.Next(255));
                    using (Pen p = new Pen(c,1))
                    {
                        g.DrawLine(p,new Point(0,0), new Point(x,y));
                    }
                }
            }

            /*
            // 使用双缓冲
            Graphics displayGraphics = e.Graphics;
            Random r = new Random();
            Image i = new Bitmap(ClientRectangle.Width, ClientRectangle.Height);
            Graphics g = Graphics.FromImage(i);

            g.FillRectangle(Brushes.White, ClientRectangle);
            for(int x = 0; x < ClientRectangle.Width; x++)
            {
                for(int y = 0; y < ClientRectangle.Height; y += 10)
                {
                    Color c = Color.FromArgb(r.Next(255), r.Next(255), r.Next(255));
                    using (Pen p = new Pen(c,1))
                    {
                        g.DrawLine(p,new Point(0,0), new Point(x,y));
                    }
                    //Pen p = new Pen(c,1);
                    //g.DrawLine(p,new Point(0,0), new Point(x,y));
                    //p.Dispose();
                }
            }
            displayGraphics.DrawImage(i, ClientRectangle);
            i.Dispose();
            */
        }
    }
}