学步园

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;

namespace Ex13_32
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private Bitmap MyBitmap;
        private void button2_Click(object sender, EventArgs e)
        {
            //打开图像文件
            OpenFileDialog openFileDialog = new OpenFileDialog();
            openFileDialog.Filter = "图像文件(JPeg, Gif, Bmp, etc.)|*.jpg;*.jpeg;*.gif;*.bmp;*.tif; *.tiff; *.png| JPeg 图像文件(*.jpg;*.jpeg)|*.jpg;*.jpeg |GIF 图像文件(*.gif)|*.gif |BMP图像文件(*.bmp)|*.bmp|Tiff图像文件(*.tif;*.tiff)|*.tif;*.tiff|Png图像文件(*.png)| *.png |所有文件(*.*)|*.*";
            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                //得到原始大小的图像
                Bitmap SourceBitmap = new Bitmap(openFileDialog.FileName);
                //得到缩放后的图像
                MyBitmap = new Bitmap(SourceBitmap, this.pictureBox1.Width, this.pictureBox1.Height);
                this.pictureBox1.Image = MyBitmap;
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //以积木效果显示图像
            try
            {
                Graphics myGraphics = this.panel1.CreateGraphics ();
                //Bitmap myBitmap = new Bitmap(this.BackgroundImage);
                int myWidth, myHeight, i, j, iAvg, iPixel;
                Color myColor, myNewColor;
                RectangleF myRect;
                myWidth = MyBitmap.Width;
                myHeight = MyBitmap.Height;
                myRect = new RectangleF(0, 0, myWidth, myHeight);
                Bitmap bitmap = MyBitmap.Clone(myRect, System.Drawing.Imaging.PixelFormat.DontCare);
                i = 0;
                while (i < myWidth - 1)
                {
                    j = 0;
                    while (j < myHeight - 1)
                    {
                        myColor = bitmap.GetPixel(i, j);
                        iAvg = (myColor.R + myColor.G + myColor.B) / 3;
                        iPixel = 0;
                        if (iAvg >= 128)
                            iPixel = 255;
                        else
                            iPixel = 0;
                        myNewColor = Color.FromArgb(255, iPixel, iPixel, iPixel);
                        bitmap.SetPixel(i, j, myNewColor);
                        j = j + 1;
                    }
                    i = i + 1;
                }
                myGraphics.Clear(Color.WhiteSmoke);
                myGraphics.DrawImage(bitmap, new Rectangle(0, 0, myWidth, myHeight));
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "信息提示");
            }
        }
    }
}