puzzle tile picture game

using System;
using System.Drawing;
using System.Windows.Forms;
using System.Threading;
using System.IO;
namespace puzzle_game
{
    public partial class Form1 : Form
    {
        Button[,] btns;
        int[] blank = new int[2];
        Image[] cropped = new Image[9];
        Point[] btnlocation;//pre determined locations for buttons, for resetting
        Boolean isPlaying = false;
        Image splitdimg;
        String splitdImgfilename = "";
        Bitmap btndefault = new Bitmap("res/button.png");
        Bitmap blankbtn = new Bitmap("res/blank.png");
        public Form1()// initialises the btns, bntlocation and calls movetiles()
        {
            InitializeComponent();
            btns = new Button[3, 3] { { btn1, btn2, btn3 }, { btn4, btn5, btn6 }, { btn7, btn8, btn9 } };
            btnlocation = new Point[9]{btn1.Location,btn2.Location,btn3.Location,btn4.Location,btn5.Location,btn6.Location,btn7.Location,btn8.Location,btn9.Location};
            movetiles();
        }
        private void movetiles()//randomly moves tiles to simulate 500 mouse clicks on random adjacent(to the blank) tiles, ensures winnability
        {   Random rdm = new Random();
            int tmp=0;
            isPlaying = false;
            if (splitdimg != null)
            {LoadImage(splitdimg);}
            reset();
            for (int l = 0; l < 500; l++)//simulating the 500 clicks
            {   tmp = rdm.Next(0, 5);
                try
                {
                    switch (tmp)//moving the blank
                    {
                        case 1:
                            check(blank[0] + 1, blank[1]);
                            break;
                        case 2:
                            check(blank[0] - 1, blank[1]);
                            break;
                        case 3:
                            check(blank[0], blank[1]-1);
                            break;
                        case 4:
                            check(blank[0], blank[1]+1);
                            break;
                    }
                }catch (Exception){}
            }
            lblwin.Text = "";
            isPlaying = true;
        }
        private void swap(int chk1, int chk2)//simply changes the text value of one button to another, specifically the button pressed to the blank and vice versa
        {   btns[blank[0], blank[1]].Text = btns[chk1, chk2].Text;//changes blank to the button pressed
            btns[blank[0], blank[1]].Tag = btns[chk1, chk2].Tag;
            if (splitdimg == null){//swapping background image/setting to blank
                btns[blank[0], blank[1]].BackgroundImage = btndefault;
            }else{
                btns[blank[0], blank[1]].BackgroundImage = btns[chk1, chk2].BackgroundImage;
            }

            btns[chk1, chk2].BackgroundImage = blankbtn;
            blank[0] = chk1;//changes button pressed to the blank
            blank[1] = chk2;
            btns[chk1, chk2].Text = "";//the button pressed becomes the blank
            btns[chk1, chk2].Tag = "";
        }
        private bool wincheck()//checks if the game is won
        {
            bool iswin = false;
            int winincr = 1;
            for (int i = 0; i <= 2; i++)//the first dim of the array
            {
                for (int n = 0; n <= 2; n++)//second dim
                {
                    if (!(winincr >= 9))//check for last button, basically if it gets to the 9th one it should be blank, and you should win.
                    {
                        if (btns[i, n].Tag != winincr.ToString())//because the win is 1,2,3,4 etc the next button should correspond to a incrament of 1 each time,
                        { //so if it is not then you loose and the loop breaks
                            iswin = false;
                            i = 10;
                            break;
                        }else{iswin = true;}//if they are the same each time then the method will return true, meaning a win
                    }
                    winincr++;
                }
            }
            return iswin;
        }
        private void check(int chk1,int chk2)//checks to see if the blank space is next to the button press and also calls wincheck
        {//since the parameters are the buttons array coords:
            if (((blank[0] + 1) == chk1) && (blank[1] == chk2)){//checks to see if the blank is to the direct bottom of the button pressed
                swap(chk1, chk2); }
            else if (((blank[0] - 1) == chk1) && (blank[1] == chk2)){//to the top
                swap(chk1, chk2); }
            else if ((blank[0] == chk1) && ((blank[1] + 1) == chk2)){//to the right
                swap(chk1, chk2);}
            else if ((blank[0] == chk1) && ((blank[1] - 1) == chk2)) {//and to the left of the blank
                swap(chk1, chk2); }//if the button pressed is next to the blank then they are swapped
            if (wincheck() && isPlaying){//checks win each button press because when else would you do it
                onWin();
            }else{
                lblwin.Text = "";}
        }
        private void onWin()//what happens when the game is won
        {
            lblwin.Text = "YOU ARE WINNER, HAHAHA";
            for (int i = 0; i <= 2; i++)
            {
                for (int l = 0; l <= 2; l++)//disables all the tiles cause the game is won
                {btns[i, l].Enabled = false;}
            }
            if (splitdimg != null)
                btns[2, 2].BackgroundImage = cropped[8];//makes it so full image appears on win, if image is loaded
        }
        private void btn1_Click(object sender, EventArgs e){ check(0, 0); }//buttons simply send their array coordinates to the check function
        private void btn2_Click(object sender, EventArgs e){ check(0, 1); }
        private void btn3_Click(object sender, EventArgs e){ check(0, 2); }
        private void btn4_Click(object sender, EventArgs e){ check(1, 0); }
        private void btn5_Click(object sender, EventArgs e){ check(1, 1); }
        private void btn6_Click(object sender, EventArgs e){ check(1, 2); }
        private void btn7_Click(object sender, EventArgs e){ check(2, 0); }
        private void btn8_Click(object sender, EventArgs e){ check(2, 1); }
        private void btn9_Click(object sender, EventArgs e){ check(2, 2); }
        private void btnshuffle_Click(object sender, EventArgs e){ movetiles(); }//allows player to reset/change game if they're a casual
        private void reset()//resets buttons to a win or default position
        {   int iter=1;
            for (int i = 0; i <= 2; i++)//sets the buttons to default for simulating, especially for shuffle button(sets buttons 1-8 then blank)
            {
                for (int n = 0; n <= 2; n++)
                {
                    btns[i, n].Enabled = true;
                    if (iter == 9)
                    {
                        btns[i, n].Text = "";
                        btns[i, n].Tag = "";
                        blank[0] = i;
                        blank[1] = n;
                    }else{
                        if (splitdimg == null)
                        {
                            btns[i, n].Text = iter.ToString();
                        }
                        else
                        {
                            btns[i, n].Text = "";
                        }
                        btns[i, n].Tag = iter.ToString();
                        iter++;
                    }
                }
            }
        }
        private void saveGame()// Saves the game to a binary file
        {
            SaveFileDialog savedialg = new SaveFileDialog();// created dialog for users to create a specific file
            savedialg.Filter = "Binary Files (*.bin)|*.bin"; // setting filters/ asthetics
            savedialg.Title = "Create/select file to save to";
            savedialg.CreatePrompt = true;
            savedialg.ShowDialog();
            Stream save = savedialg.OpenFile();
            BinaryWriter writr = new BinaryWriter(save);// opens a new binarywriter using the newly created file
            if (splitdimg != null)//if there is a picture loaded then the filename is saved too
            {
                writr.Write(splitdImgfilename);
            }
            else
            {
                writr.Write("none");
            }
            for (int i = 0; i <= 2; i++)
            {
                for (int l = 0; l <= 2; l++)
                {
                    if (btns[i, l].Text == "")// writing the buttons in order
                    {
                        writr.Write(9);
                    }
                    else
                    {
                        writr.Write(Int32.Parse(btns[i, l].Text));
                    }
                }
            }
            savedialg.Dispose();
            save.Close();
            writr.Close();
        }
        private void loadGame()// loads the game from a binary file
        {
           OpenFileDialog dialg = new OpenFileDialog();
           dialg.Filter = "Binary Files(*.bin)|*.bin";
           dialg.ShowDialog();
           if (dialg.FileName == null || dialg.FileName == "")
           {
               return;
           }
           Stream load = dialg.OpenFile();
           BinaryReader bReadr = new BinaryReader(load);//creates a new binaryreader using the user specified file
           Int32 tmpint = 0;
           try
           {
               splitdImgfilename = bReadr.ReadString();
               if (splitdImgfilename != "none")
               {
                   splitdimg = new Bitmap(splitdImgfilename);// tries to load a saved image
               }
               Loadcrops(splitdimg);
           }
           catch (Exception)
           {

           }
           for (int i = 0; i <= 2; i++)
           {
               for (int l = 0; l <= 2; l++)
               {
                   tmpint = bReadr.ReadInt32();//loads the next value into a temp
                   if (tmpint == 9)// sets the buttons to the loaded order
                   {
                       blank[0] = i;
                       blank[1] = l;
                       btns[i, l].BackgroundImage = blankbtn;
                       btns[i, l].Text = "";
                   }
                   else
                   {
                       if (splitdimg != null)
                       {
                           btns[i, l].BackgroundImage = cropped[tmpint - 1];
                           btns[i, l].Text = "";
                       }
                       else
                       {
                           btns[i, l].BackgroundImage = btndefault;
                           btns[i, l].Text = tmpint.ToString();
                       }
                   }
               }
           }
           load.Close();
           bReadr.Close();
        }
        private static Image cropImage(Image img, Rectangle cropArea)//crops specified image using specified rect, returns cropped image
        {   Bitmap bmpCrop =null;
            try
            {   Bitmap bmpImage = new Bitmap(img);
                bmpCrop = bmpImage.Clone(cropArea, bmpImage.PixelFormat);//creates a clone of the area essentially cropping it
            }
            catch (Exception ex)
            {MessageBox.Show(ex.Message + " rect h" + cropArea.Height + " w" + cropArea.Width + " x" +cropArea.X + " y" + cropArea.Y ); }
            GC.Collect();
            return (Image)(bmpCrop);
        }
        private void Loadcrops(Image img)//crops a picture using the cropimage function and puts them into an array
        {
            int hres = img.Width / 3, vres = img.Height / 3;
            int iter = 0;
                for (int i = 0; i <= 2; i++)
                {
                    for (int l = 0;l <= 2; l++)
                    {
                        Rectangle rec = new Rectangle(hres * l, vres * i, hres, vres);
                        cropped[iter] = cropImage(img, rec);
                        iter++;
                        btns[i, l].Top = (124 * i) + 100;
                        btns[i, l].Left = (124 * l) + 100;
                        btns[i, l].Size = new Size(124, 124);
                    }
                }
        }
        private void LoadImage(Image img)//Loads the cropped array into the buttons
        {
            splitdimg = img;
            int iter=0;
            Loadcrops(splitdimg);
                for (int i = 0; i <= 2; i++)
                {
                    for (int l = 0; l <= 2; l++)
                    {
                        if (!(i == 2 && l == 2))
                        {
                            btns[i, l].BackgroundImage = cropped[iter];
                        }
                        iter++;
                        btns[i, l].Top = (124* i) + 100;
                        btns[i, l].Left = (124  * l) + 100;
                        btns[i, l].Size = new Size(124, 124);
                    }
            }
        }
        private void btnload_Click(object sender, EventArgs e)//creates a dialog for a user to load an image, then loads/shuffles tiles
        {   OpenFileDialog dialg = new OpenFileDialog();
            dialg.Title="Open Image";
            dialg.Filter = "Image Files (*.bmp*.jpg; *.jpeg; *.bmp; *.png)|*.jpg; *.jpeg; *.bmp; *.png";
            dialg.ShowDialog();
            if (dialg.FileName != ""){
                splitdimg = new Bitmap(dialg.FileName);
                splitdImgfilename = dialg.FileName;
                for (int i = 0; i <= 2; i++)
                {
                    for (int n = 0; n <= 2; n++)
                    {
                        btns[i, n].Text = "";
                    }
                }
                movetiles();}//load/shuffle
        }
        private void btnreset_Click(object sender, EventArgs e)//resets the game back to default, and shuffles
        {   int iter=0;
            splitdimg = null;
            for (int i = 0; i <= 2; i++)
            {
                for (int l = 0; l <= 2; l++)//reseting the game
                {
                    btns[i,l].Location = btnlocation[iter];//pre-determined locations being loaded
                    btns[i, l].Size = new Size(96, 96);
                    btns[i, l].BackgroundImage = btndefault;
                    iter++;
                }
            }
            movetiles();
        }
        private void btnsave_Click(object sender, EventArgs e){saveGame();}
        private void btnloadgame_Click(object sender, EventArgs e){ loadGame(); }
    }
}