using System;
using System.Drawing;
using System.Windows.Forms;
using System.Drawing.Imaging;

public class FormMain : Form {
    [STAThread]
    static void Main() { Application.Run(new FormMain()); }  
    Button button_read=new Button(), button_thicker = new Button(), button_write = new Button();
    Button button_thinner = new Button(); 
    Button bfit = new Button(); 
    TextBox torig = new TextBox(), tbase = new TextBox(), ttobe = new TextBox();
    TextBox tpix = new TextBox(); 
    PictureBox pbox=new PictureBox(); 
    Bitmap bm, bmmodif, bmout; 
    int limitw=0, limite=0, limitn=0, limits=0, visiw=0, visih=0; 
    public FormMain() {
        int y1 = 2, y2=27;
        this.Size = new Size(900, 760); 
        // 
        button_read.SetBounds(10, y1, 80, 20);
        button_read.Text = "ファイル読込";
        button_read.Click += (o, e) => {
            OpenFileDialog dialog = new OpenFileDialog();
            if(dialog.ShowDialog() == DialogResult.OK) {
                bm = new Bitmap(Image.FromFile(dialog.FileName));
                bmmodif = new Bitmap(Image.FromFile(dialog.FileName)); 
                pbox.Image = bmmodif; 
                limite = bm.Width;
                limits = bm.Height;  
                torig.Text = limite.ToString() + ", " + limits.ToString(); 
                visiw = 400; 
                visih = 300;
                ttobe.Text = visiw.ToString() + ", " + visih.ToString(); 
                limitw = limitn = 0;
                tbase.Text = "0, 0"; 
                Refresh(); 
                } }; 
        Controls.Add(button_read); 
        // 
        button_thinner.SetBounds(110, y1, 80, 20);
        button_thinner.Text = "薄くする";
        button_thinner.Click += (o, e) => { 
            for (int j=0; j<bm.Height; j++) {
                for (int i=0; i<bm.Width; i++) { 
                    Color pixel = bm.GetPixel(i, j); 
                    Color pnew = Color.FromArgb(thin(pixel.R), thin(pixel.G), thin(pixel.B)); 
                    bm.SetPixel(i, j, pnew); } }
            doshadow();  
            pbox.Refresh(); };   
        Controls.Add(button_thinner);
        // 
        button_thicker.SetBounds(110, y2, 80, 20);
        button_thicker.Text = "濃くする";
        button_thicker.Click += (o, e) => { 
            for (int j=0; j<bm.Height; j++) {
                for (int i=0; i<bm.Width; i++) { 
                    Color pixel = bm.GetPixel(i, j); 
                    Color pnew = Color.FromArgb(func(pixel.R), func(pixel.G), func(pixel.B)); 
                    bm.SetPixel(i, j, pnew); } }
            doshadow();  
            pbox.Refresh(); };   
        Controls.Add(button_thicker);
        // 
        button_write.SetBounds(10, y2, 80, 20);
        button_write.Text = "ファイル書出";
        button_write.Click += (o,e) => { 
                bmout = new Bitmap(limite-limitw, limits-limitn);
            for (int i=0; i<visiw; i++) {
                for (int j=0; j<visih; j++) {
                    Color pixel = bm.GetPixel(i+limitw, j+limitn);  
                    bmout.SetPixel(i, j, pixel); } } 
            SaveFileDialog dialog = new SaveFileDialog();
            dialog.Filter = "PNG|*.png|JPEG|*.jpg|gif|*.GIF|tiff|*.TIFF|BMP|*.bmp"; 
                // === initial value of dialog.FilterIndex is 1, so PNG is default !!! 
            if(dialog.ShowDialog() == DialogResult.OK) {
                string strwk = dialog.Filter, strtk="";
                for (int i=1; i<100; i++) {
                    int j = strwk.IndexOf("|"); 
                    if (j<0){ break; }
                    strtk = strwk.Substring(0, j); 
                    if (i == dialog.FilterIndex) { break; } 
                    strwk = strwk.Substring(j + 1); 
                    int j1 = strwk.IndexOf("|"); 
                    strwk = strwk.Substring(j1 + 1);
                } 
                ImageCodecInfo encoder = null; 
                foreach (ImageCodecInfo ici in ImageCodecInfo.GetImageEncoders()) {
                    string str = ici.FormatDescription.ToString(); 
                    if (ici.FormatDescription == strtk) { 
                        encoder = ici; break; }  
                } 
                if (encoder != null) { 
                    EncoderParameters encParams = new EncoderParameters(1);
                    encParams.Param[0] = new EncoderParameter(Encoder.Quality, 100L);
                    bmout.Save(dialog.FileName, encoder, encParams); } } }; 
        Controls.Add(button_write); 
        // 
        { int x1 = 210;
            Label label = new Label(); label.Text = "orig. size(w, h)";
            label.SetBounds(x1, y2-15, 100, 15);
            Controls.Add(label); 
            torig.SetBounds(x1, y2, 75, 20);
            torig.Enabled = false; 
            Controls.Add(torig); } 
        bfit.SetBounds(310, y2, 80, 20);
        Controls.Add(bfit); 
        bfit.Text = "全体採用";
        bfit.Click += (o, e) => { 
            ttobe.Text = torig.Text; 
            tbase.Text = "0, 0";   
        };
        // 
        { int x1 = 410;
            Label label = new Label(); label.Text = "NWpoint(x, y)";
            label.SetBounds(x1, y2-15, 80, 15);
            Controls.Add(label); 
            tbase.SetBounds(x1, y2, 75, 20);
            Controls.Add(tbase); } 
        // 
        { int x1 = 500;
            Label label = new Label(); label.Text = "trim size(w, h)";
            label.SetBounds(x1,y2-15, 80, 15);
            Controls.Add(label); 
            ttobe.SetBounds(x1, y2, 75, 20);
            Controls.Add(ttobe); } 
        
        tbase.TextChanged += (o, e) => { 
            try{
                int c = tbase.Text.IndexOf(",");
                int x = int.Parse(tbase.Text.Substring(0, c));
                int y = int.Parse(tbase.Text.Substring(c + 1));  
                limitw = x;
                limite = limitw + visiw; 
                limitn = y;
                limits = limitn + visih; 
                doshadow();
                Refresh();  
            } catch { } 
        };  
        ttobe.TextChanged += (o, e) => { 
            try{
                int c = ttobe.Text.IndexOf(",");
                int x = int.Parse(ttobe.Text.Substring(0, c));
                int y = int.Parse(ttobe.Text.Substring(c + 1)); 
                visiw = x;
                limite = limitw + visiw; 
                visih = y;
                limits = limitn + visih; 
                doshadow();
                Refresh();  
            } catch { } 
        };
        { int x1 = 610;
            Label label = new Label(); label.Text = "color";
            label.SetBounds(x1, y2-15, 100, 15);
            Controls.Add(label); 
            tpix.SetBounds(x1, y2, 95, 20);
            tpix.Enabled = false; 
            Controls.Add(tpix); } 
        // 
        int origx = 10, origy = 50; 
        pbox.SetBounds(origx, origy, 1280, 950);
        Controls.Add(pbox); 
        pbox.MouseMove += (o, e) => {
            int xwas = xsample; 
            int x = e.X, y = e.Y;
            if (bm == null || x<10 || y<10 || x>=bm.Width || y >= bm.Height) {
                xsample = -1;  ysample = -1;  
                if (xwas >= 0) {  
                    doshadow();
                    Refresh(); }  
                return; } 
            int huh = 1;
            xsample = x;  ysample = y; 
            Color pixel = bm.GetPixel(x, y);
            int r = pixel.R, g = pixel.G, b = pixel.B;
            string str = r.ToString() + ", " + g.ToString() + ", " + b.ToString();
            tpix.Text = str; 
            doshadow();
            Refresh(); 
        }; 
        pbox.MouseLeave += (o, e) => {
            xsample = -1;
            ysample = -1;
            doshadow();
            Refresh();
        }; 
    } // ======================================================================== 
    int xsample=-1, ysample = -1; 
    void doshadow() { 
        if (bm==null) { return; } 
        for (int i=0; i<bm.Width; i++) {
            for (int j=0; j<bm.Height; j++) {
                int i0 = xsample, j0 = ysample; 
                    Color pixel = bm.GetPixel(i, j); 
                    if ((i == i0 && Math.Abs(j-j0)>5) || (j == j0 && Math.Abs(i-i0)>5)) {
                        Color pnew = Color.FromArgb(0, 0, 0); 
                        bmmodif.SetPixel(i, j, pnew); 
                    } else if (i < limitw || j < limitn || i >= limite || j >= limits) {
                        Color pnew = Color.FromArgb(pixel.R/4, pixel.G/4, pixel.B/4); 
                        bmmodif.SetPixel(i, j, pnew); 
                    } else {
                        Color pnew = Color.FromArgb(pixel.R, pixel.G, pixel.B); 
                        bmmodif.SetPixel(i, j, pnew); 
                    }  
            } 
            if (limite <= bm.Width && limits <= bm.Height) {
                button_write.Enabled = true; 
            } else {
                button_write.Enabled = false; 
            } 
        }  
    } // ======================================================================= 
    int thin(int ref0) { 
        int toret = 255 - (255 - ref0) / 2;   
        return toret; 
    } // ======================================================================== 
    int func(int ref0) {
        int toret = ref0 - 50; 
        if (ref0 < 100) {
            toret = ref0 / 2; 
        } else if (ref0 >= 205) {
            toret = 255 - (255 - ref0) * 2;  
        }
        return toret; 
    } // ======================================================================== 
} // ######################## PictureTrimmer.cs end #############################