No 69 · 以光照效果显示图像

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;namespace Ex13_13{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void button2_Click(object sender, EventArgs e)        {            //打图像文件            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)            {                Bitmap MyBitmap = new Bitmap(openFileDialog.FileName);                this.pictureBox1.Image = MyBitmap;            }        }        private void button1_Click(object sender, EventArgs e)        {            //以光照效果显示图像            Graphics MyGraphics = this.pictureBox1.CreateGraphics();            MyGraphics.Clear(Color.White);            Bitmap MyBmp = new Bitmap(this.pictureBox1.Image, this.pictureBox1.Width, this.pictureBox1.Height);            int MyWidth = MyBmp.Width;            int MyHeight = MyBmp.Height;            Bitmap MyImage = MyBmp.Clone(new RectangleF(0, 0, MyWidth, MyHeight), System.Drawing.Imaging.PixelFormat.DontCare);            int A = Width / 2;            int B = Height / 2;            //MyCenter图片中心点，发亮此值会让强光中心发生偏移            Point MyCenter = new Point(MyWidth / 2, MyHeight / 2);            //R强光照射面的半径，即”光晕”            int R = Math.Min(MyWidth / 2, MyHeight / 2);            for (int i = MyWidth - 1; i >= 1; i--)            {                for (int j = MyHeight - 1; j >= 1; j--)                {                    float MyLength = (float)Math.Sqrt(Math.Pow((i - MyCenter.X), 2) + Math.Pow((j - MyCenter.Y), 2));                    //如果像素位于”光晕”之内                    if (MyLength < R)                    {                        Color MyColor = MyImage.GetPixel(i, j);                        int r, g, b;                        //220亮度增加常量，该值越大，光亮度越强                        float MyPixel = 220.0f * (1.0f - MyLength / R);                        r = MyColor.R + (int)MyPixel;                        r = Math.Max(0, Math.Min(r, 255));                        g = MyColor.G + (int)MyPixel;                        g = Math.Max(0, Math.Min(g, 255));                        b = MyColor.B + (int)MyPixel;                        b = Math.Max(0, Math.Min(b, 255));                        //将增亮后的像素值回写到位图                        Color MyNewColor = Color.FromArgb(255, r, g, b);                        MyImage.SetPixel(i, j, MyNewColor);                    }                }                //重新绘制图片                MyGraphics.DrawImage(MyImage, new Rectangle(0, 0, MyWidth, MyHeight));            }        }    }}