画图的相关问题

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public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }
    
    private Bitmap curbitmap=null;
    private string curfileName=null;
    private void button1_Click(object sender, EventArgs e)
    {
        OpenFileDialog OpenDlg = new OpenFileDialog();
        OpenDlg.Filter = "所有图像文件|*.bmp;*.jpg;*.png;*.gif;*.pcx;";
        OpenDlg.Title = "打开图像文件";
      //  OpenDlg.ShowHelp = true;
        if (OpenDlg.ShowDialog()==DialogResult.OK)
        {
            //获取文件的名称//文件的路径
              curfileName = OpenDlg.FileName;
            //创建图像对象
            try
            {
                curbitmap = (Bitmap)Image.FromFile(curfileName);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }

        }
       Invalidate();
        //刷新图片
        //fulshMap(curbitmap);

    }

    private void fulshMap(Bitmap map)
    {
        Graphics g = this.CreateGraphics();
        // g.Clear(Color.White);
        if (map != null)
        {
            float m = 600;
            float k = map.Height / m;
            g.DrawImage(map, 160, 20, map.Width / k, m);
        }
    }

    private void button2_Click(object sender, EventArgs e)
    {
        if (curbitmap == null) return;
        SaveFileDialog saveDlg = new SaveFileDialog();
        saveDlg.Title = "保存为：";
        saveDlg.OverwritePrompt = true;
        if (saveDlg.ShowDialog() == DialogResult.OK)
        {
            string fileName = saveDlg.FileName;
            // MessageBox.Show(fileName);
            //获取文件的扩展名
          string ExtnName= fileName.Substring(fileName.LastIndexOf('.')+1);
            switch (ExtnName)
            {
                case "bmp":
                    curbitmap.Save(fileName,System.Drawing.Imaging.ImageFormat.Bmp);
                    break;
                case "jpg":
                    curbitmap.Save(fileName, System.Drawing.Imaging.ImageFormat.Jpeg);
                    break;
                case "gif":
                    curbitmap.Save(fileName, System.Drawing.Imaging.ImageFormat.Gif);
                    break;
                case "png":
                    curbitmap.Save(fileName, System.Drawing.Imaging.ImageFormat.Png);
                    break;
                case "tif":
                    curbitmap.Save(fileName, System.Drawing.Imaging.ImageFormat.Tiff);
                    break;
                  
                    
                default:
                    break;

            }
            MessageBox.Show("图片保存成功！："+fileName);
        }
  

      
    }

    private void button3_Click(object sender, EventArgs e)
    {
        this.Close();
    }

    private void Form1_Paint(object sender, PaintEventArgs e)
    {
        Graphics g = e.Graphics;
        if (curbitmap != null)
        {
            float m = 600;
            float k = curbitmap.Height / m;
            g.DrawImage(curbitmap, 160, 20, curbitmap.Width / k, m);
        }
    }

    private void button6_Click(object sender, EventArgs e)
    {
       Task t1 = Task.Run(()=> getPix());

       

    }

    private void getPix()
    {
        Stopwatch sw = new Stopwatch();
        sw.Start();
        int t = 0;
        if (curbitmap != null)
        {
            Color curcolor;
            int ret;
            for (int i = 0; i < curbitmap.Width; i++)
            {
                t++;
                for (int j = 0; j < curbitmap.Height; j++)
                {
                    curcolor = curbitmap.GetPixel(i, j);
                    ret = (int)(curcolor.R * 0.2999 + curcolor.G * 0.587 + curcolor.B * 0.114);
                    curbitmap.SetPixel(i, j, Color.FromArgb(ret, ret, ret));
                }
                textBox1.Invoke(new Action(() =>
                {
                    textBox1.Text = t.ToString();
                }));
            }
            fulshMap(curbitmap);
            sw.Stop();
            MessageBox.Show(sw.ElapsedMilliseconds.ToString());
        }
    }
    private void memory()
    {
        if (curbitmap != null)
        {
            Rectangle rect = new Rectangle(0,0,curbitmap.Width,curbitmap.Height);
            System.Drawing.Imaging.BitmapData bmpData = curbitmap.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite, curbitmap.PixelFormat);
            IntPtr ptr= bmpData.Scan0;

           
            int length = bmpData.Stride * bmpData.Height;
            byte[] buffers = new byte[length];
            System.Runtime.InteropServices.Marshal.Copy(ptr,buffers,0,length);
            int k = 0; 
            //灰度化
            double colorTemp = 0;
            try
            {
                for (int i = 0; i < bmpData.Height; i++)
                {
                    k++;
                    for (int j = 0; j < bmpData.Width * 3; j += 3)
                    {
                        colorTemp = buffers[i * bmpData.Stride + j] * 0.2999 + buffers[i * bmpData.Stride + j + 1] * 0.587 + buffers[i * bmpData.Stride + j + 2] * 0.114;
                        buffers[i * bmpData.Stride + j + 2] = buffers[i * bmpData.Stride + j + 1] = buffers[i * bmpData.Stride + j] = (byte)colorTemp;

                    }
                    textBox1.Invoke(new Action(() =>
                    {
                        textBox1.Text = k.ToString();
                    }));

                }
                System.Runtime.InteropServices.Marshal.Copy(buffers, 0, ptr, length);
                curbitmap.UnlockBits(bmpData);
            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
          

            Invalidate();
            textBox1.Invoke(new Action(() =>
            {
                textBox1.Text = "1";
            }));
        }
    }

    private void button5_Click(object sender, EventArgs e)
    {
        Stopwatch sw = new Stopwatch();
        sw.Start();

        if (curbitmap != null)
        {
            Rectangle rec = new Rectangle(0,0,curbitmap.Width,curbitmap.Height);
            //获取像素，并锁定在内存中

            BitmapData bmpData = curbitmap.LockBits(rec,ImageLockMode.ReadWrite,curbitmap.PixelFormat);
            int length = bmpData.Stride * bmpData.Height;
            byte[] buffers = new byte[length];
            //扫描进内存中
            System.Runtime.InteropServices.Marshal.Copy(bmpData.Scan0,buffers,0,length);
            for (int i = 0; i < bmpData.Height; i++)
            {
                for (int j = 0; j < bmpData.Width * 3; j += 3)//每个里存储3个数组
                {
                   double  colorTemp = buffers[i * bmpData.Stride + j] * 0.2999 + buffers[i * bmpData.Stride + j + 1] * 0.587 + buffers[i * bmpData.Stride + j + 2] * 0.114;
                    buffers[i * bmpData.Stride + j + 2] = buffers[i * bmpData.Stride + j + 1] = buffers[i * bmpData.Stride + j] = (byte)colorTemp;
                }
            }
            System.Runtime.InteropServices.Marshal.Copy(buffers,0,bmpData.Scan0,length);
            curbitmap.UnlockBits(bmpData);//解锁

            //刷新图片
            //fulshMap(curbitmap);
            Invalidate();
            sw.Stop();
            MessageBox.Show(sw.ElapsedMilliseconds.ToString());
        }
    }

    private void Form1_Load(object sender, EventArgs e)
    {

    }
}