Develop Reference

Bitmap high memory usage

I have an issue with my WinForms project. I need to display image of created maze and i use bitmap. But empty bitmap(9990, 9990) takes 400MB+. Is there way to decrease this memory consumption or i need to change bitmap to anything else?
Bitmap bm = new Bitmap(9990, 9990);
Thank you for your help.
The cell and wall have one size 10x10 px.
https://i.stack.imgur.com/yj9CA.png

I decreased the memory usage by using a custom PixelFormat;
It reduced memory consumption by 2-4 times.
var format = System.Drawing.Imaging.PixelFormat.Format16bppRgb565;
inBm = new Bitmap(
CellWid * (maze.finish.X + 2),
CellHgt * (maze.finish.Y + 2), format);

Is there a way to decrease memory consumption? As long as you do not need the whole maze rendered at once there is. You use 10*10*4 = 400B to store information about one cell. Chances are, you only need to know if the cell is a wall or not. That is 1 bit. You can reduce 400MB to 125kB to store information about the whole maze. And render only the part you actually need. Here is some code to play with, this draws 999x999 cells "maze" you can move by mouse
BitArray maze = null;
int mazeWidth = 999;
int mazeHeight = 999;
int xPos = 0;
int yPos = 0;
int cellSize = 10;
private void Form1_Load(object sender, EventArgs e)
{
maze = new BitArray(mazeWidth * mazeHeight);
Random rnd = new Random();
for (int i = 0; i < maze.Length; ++i)
{
maze[i] = rnd.Next(4) == 0;
}
xPos = -Width / 2;
yPos = -Height / 2;
DoubleBuffered = true;
}
private void Form1_Paint(object sender, PaintEventArgs e)
{
for (int y = Math.Max(0, yPos / cellSize); y < mazeHeight; ++y)
{
int yDraw = y * cellSize - yPos;
if (yDraw > Height) { return; }
for (int x = Math.Max(0, xPos / cellSize); x < mazeWidth; ++x)
{
if (maze[x + y * mazeWidth])
{
int xDraw = x * cellSize - xPos;
if (xDraw > Width) { break; }
e.Graphics.FillRectangle(
Brushes.Black,
xDraw,
yDraw,
cellSize,
cellSize
);
}
}
}
}
public static int Clamp(int value, int min, int max)
{
if (value < min) { return min; }
if (value > max) { return max; }
return value;
}
int fromX;
int fromY;
private void Form1_MouseDown(object sender, MouseEventArgs e)
{
fromX = e.X;
fromY = e.Y;
}
private void Form1_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
int w2 = Width / 2;
int h2 = Height / 2;
xPos = Clamp(xPos + fromX - e.X, -w2, mazeWidth * cellSize - w2);
yPos = Clamp(yPos + fromY - e.Y, -h2, mazeHeight * cellSize - h2);
fromX = e.X;
fromY = e.Y;
Invalidate();
}
}

Fractal renderer not displaying image at all?

I'm converting a fractal renderer from Java to C# for an assignment and I think I have everything set up but the fractal itself won't render.
This is a photo of when I run the program:
And here is how my files are laid out in the folder that contains the project itself:
This is the code that I am using for the actually rendering itself which I think has no errors but if I've missed something extremely obvious then I'm sorry for wasting all of your time:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
init();
start();
this.DoubleBuffered = true;
}
//code to convert HSB to RGB from HSB.cs. All your code so i made it take up less space.
public struct HSBColor
{
float h;
float s;
float b;
int a;
public HSBColor(float h, float s, float b) { this.a = 0xff; this.h = Math.Min(Math.Max(h, 0), 255); this.s = Math.Min(Math.Max(s, 0), 255); this.b = Math.Min(Math.Max(b, 0), 255); }
public HSBColor(int a, float h, float s, float b) { this.a = a; this.h = Math.Min(Math.Max(h, 0), 255); this.s = Math.Min(Math.Max(s, 0), 255); this.b = Math.Min(Math.Max(b, 0), 255); }
public float H { get { return h; } }
public float S { get { return s; } }
public float B { get { return b; } }
public int A { get { return a; } }
public Color Color { get { return FromHSB(this); } }
public static Color FromHSB(HSBColor hsbColor)
{
float r = hsbColor.b;
float g = hsbColor.b;
float b = hsbColor.b;
if (hsbColor.s != 0)
{
float max = hsbColor.b; float dif = hsbColor.b * hsbColor.s / 255f; float min = hsbColor.b - dif; float h = hsbColor.h * 360f / 255f;
if (h < 60f) { r = max; g = h * dif / 60f + min; b = min; }
else if (h < 120f) { r = -(h - 120f) * dif / 60f + min; g = max; b = min; }
else if (h < 180f) { r = min; g = max; b = (h - 120f) * dif / 60f + min; }
else if (h < 240f) { r = min; g = -(h - 240f) * dif / 60f + min; b = max; }
else if (h < 300f) { r = (h - 240f) * dif / 60f + min; g = min; b = max; }
else if (h <= 360f) { r = max; g = min; b = -(h - 360f) * dif / 60 + min; }
else { r = 0; g = 0; b = 0; }
}
return Color.FromArgb(hsbColor.a, (int)Math.Round(Math.Min(Math.Max(r, 0), 255)), (int)Math.Round(Math.Min(Math.Max(g, 0), 255)), (int)Math.Round(Math.Min(Math.Max(b, 0), 255)));
}
}
private const int MAX = 256; // max iterations
private const double SX = -2.025; // start value real
private const double SY = -1.125; // start value imaginary
private const double EX = 0.6; // end value real
private const double EY = 1.125; // end value imaginary
private static int x1, y1, xs, ys, xe, ye;
private static double xstart, ystart, xende, yende, xzoom, yzoom;
private static float xy;
private int c = 0;
//private Image picture; Taken out, not needed
// create rectangle variable JGB
Rectangle rec;
private Graphics g1;
//private Cursor c1, c2; Taken out, not needed
private System.Drawing.Bitmap bitmap;
public void init()
{
//setSize(640, 480); changed this code to JGB:
this.Size = new Size(640, 480);
// Taken all lines out below. Not needed.
/*finished = false;
addMouseListener(this);
addMouseMotionListener(this);
c1 = new Cursor(Cursor.WAIT_CURSOR);
c2 = new Cursor(Cursor.CROSSHAIR_CURSOR); */
x1 = 640;
y1 = 480;
xy = (float)x1 / (float)y1;
//picture = createImage(x1, y1); Taken out and replaced with JGB:
bitmap = new Bitmap(x1, y1);
//g1 = picture.getGraphics(); changed to get my bitmap
g1 = Graphics.FromImage(bitmap);
//finished = true; Finished variable deleted so not needed
}
//Code below didnt appear to do anything so i deleted it
/*public void destroy() // delete all instances
{
if (finished)
{
removeMouseListener(this);
removeMouseMotionListener(this);
picture = null;
g1 = null;
c1 = null;
c2 = null;
System.gc(); // garbage collection
}
} */
public void start()
{
//action = false;
//rectangle = false;
initvalues();
// added dialog box for instance loading and save varaibles needed for position and zoom to text file
DialogResult dialog = MessageBox.Show("Would You Like to Load Your Last Instance?", "Load Instance?", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question);
if (dialog == DialogResult.Yes)
{
string[] lines = System.IO.File.ReadAllLines(#"C:\Users\Public\Writelines.txt");
xzoom = System.Convert.ToDouble(lines[0]);
yzoom = System.Convert.ToDouble(lines[1]);
xstart = System.Convert.ToDouble(lines[2]);
ystart = System.Convert.ToDouble(lines[3]);
}
else
{
xzoom = (xende - xstart) / (double)x1;
yzoom = (yende - ystart) / (double)y1;
}
mandelbrot();
}
public void stop()
{
}
/*public void paint(Graphics g, PaintEventArgs e)
{
update(g);
}
public void update(Graphics g)
{
//g.DrawImage(picture, 0, 0);
}*/
private void mandelbrot()
{
int x, y;
float h, b, alt = 0.0f;
Color color;
Pen pen = new Pen(Color.Black);
for (x = 0; x < x1; x += 2)
for (y = 0; y < y1; y++)
{
h = pointcolour(xstart + xzoom * (double)x, ystart + yzoom * (double)y, c);
if (h != alt)
{
b = 1.0f - h * h;
color = HSBColor.FromHSB(new HSBColor(h * 255, 0.8f * 255, b * 255));
pen = new Pen(color);
alt = h;
}
g1.DrawLine(pen, x, y, x + 1, y);
}
}
private float pointcolour(double xwert, double ywert, int j)
{
double r = 0.0, i = 0.0, m = 0.0;
// int j = 0;
while ((j < MAX) && (m < 4.0))
{
j++;
m = r * r - i * i;
i = 2.0 * r * i + ywert;
r = m + xwert;
}
return (float)j / (float)MAX;
}
private void initvalues()
{
xstart = SX;
ystart = SY;
xende = EX;
yende = EY;
if ((float)((xende - xstart) / (yende - ystart)) != xy)
xstart = xende - (yende - ystart) * (double)xy;
}
private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g1 = e.Graphics;
g1.DrawImage(bitmap, 0, 0, x1, y1);
using (Pen pen = new Pen(Color.White, 2))
{
e.Graphics.DrawRectangle(pen, rec);
}
Invalidate();
}
//added load method
private void Form1_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
xe = e.X;
ye = e.Y;
if (xs < xe)
{
if (ys < ye) rec = new Rectangle(xs, ys, (xe - xs), (ye - ys));
else rec = new Rectangle(xs, ye, (xe - xs), (ys - ye));
}
else
{
if (ys < ye) rec = new Rectangle(xe, ys, (xs - xe), (ye - ys));
else rec = new Rectangle(xe, ye, (xs - xe), (ys - ye));
}
this.Invalidate();
}
}
private void Form1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
// e.consume();
xs = e.X;
ys = e.Y; // starting point y
this.Invalidate();
}
}
private void Form1_MouseUp(object sender, MouseEventArgs e)
{
rec = new Rectangle(0, 0, 0, 0);
if (e.Button == MouseButtons.Left)
{
int z, w;
//e.consume();
//xe = e.X;
//ye = e.Y;
if (xs > xe)
{
z = xs;
xs = xe;
xe = z;
}
if (ys > ye)
{
z = ys;
ys = ye;
ye = z;
}
w = (xe - xs);
z = (ye - ys);
if ((w < 2) && (z < 2)) initvalues();
else
{
if (((float)w > (float)z * xy)) ye = (int)((float)ys + (float)w / xy);
else xe = (int)((float)xs + (float)z * xy);
xende = xstart + xzoom * (double)xe;
yende = ystart + yzoom * (double)ye;
xstart += xzoom * (double)xs;
ystart += yzoom * (double)ys;
}
xzoom = (xende - xstart) / (double)x1;
yzoom = (yende - ystart) / (double)y1;
mandelbrot();
string stringxzoom = xzoom.ToString();
string stringyzoom = yzoom.ToString();
string stringystart = ystart.ToString();
string stringxstart = xstart.ToString();
string[] lines = { stringxzoom, stringyzoom, stringxstart, stringystart };
System.IO.File.WriteAllLines(#"C:\Users\Public\Writelines.txt", lines);
this.Invalidate();
//Repaint();
}
}
private void restartToolStripMenuItem_Click(object sender, EventArgs e)
{
Application.Restart();
}
private void exitToolStripMenuItem1_Click(object sender, EventArgs e)
{
Application.Exit();
}
private void menuToolStripMenuItem_Click(object sender, EventArgs e)
{
}
private void menuStrip1_ItemClicked(object sender, ToolStripItemClickedEventArgs e)
{
}
}
}

Change your Form1() code into these
InitializeComponent();
init();
start();
this.DoubleBuffered = true;
this.pictureBox1.Image = bitmap;
You took out the InitializeComponent call (which should be automatically generated) and you never set the resulting bitmap as the image of the pictureBox. Also, you might wanna set the picturebox Size mode to Zoom and enlarge it.

WindowsFormsApplication1.Form1.Dispose(bool)':no suitable method found to override

For an assignment I've had to convert a fractal rendering program from Java to C# and I think I've done it but when i try to run it I get the error that is present in the title and I have no idea why it is happening. This is the code for the renderer itself which presents me with no errors:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Form1
{
public partial class Form1 : Form
{
public Form1()
{
init();
start();
this.DoubleBuffered = true;
}
//code to convert HSB to RGB from HSB.cs. All your code so i made it take up less space.
public struct HSBColor
{
float h;
float s;
float b;
int a;
public HSBColor(float h, float s, float b) { this.a = 0xff; this.h = Math.Min(Math.Max(h, 0), 255); this.s = Math.Min(Math.Max(s, 0), 255); this.b = Math.Min(Math.Max(b, 0), 255); }
public HSBColor(int a, float h, float s, float b) { this.a = a; this.h = Math.Min(Math.Max(h, 0), 255); this.s = Math.Min(Math.Max(s, 0), 255); this.b = Math.Min(Math.Max(b, 0), 255); }
public float H { get { return h; } }
public float S { get { return s; } }
public float B { get { return b; } }
public int A { get { return a; } }
public Color Color { get { return FromHSB(this); } }
public static Color FromHSB(HSBColor hsbColor)
{
float r = hsbColor.b;
float g = hsbColor.b;
float b = hsbColor.b;
if (hsbColor.s != 0)
{
float max = hsbColor.b; float dif = hsbColor.b * hsbColor.s / 255f; float min = hsbColor.b - dif; float h = hsbColor.h * 360f / 255f;
if (h < 60f) { r = max; g = h * dif / 60f + min; b = min; }
else if (h < 120f) { r = -(h - 120f) * dif / 60f + min; g = max; b = min; }
else if (h < 180f) { r = min; g = max; b = (h - 120f) * dif / 60f + min; }
else if (h < 240f) { r = min; g = -(h - 240f) * dif / 60f + min; b = max; }
else if (h < 300f) { r = (h - 240f) * dif / 60f + min; g = min; b = max; }
else if (h <= 360f) { r = max; g = min; b = -(h - 360f) * dif / 60 + min; }
else { r = 0; g = 0; b = 0; }
}
return Color.FromArgb(hsbColor.a, (int)Math.Round(Math.Min(Math.Max(r, 0), 255)), (int)Math.Round(Math.Min(Math.Max(g, 0), 255)), (int)Math.Round(Math.Min(Math.Max(b, 0), 255)));
}
}
private const int MAX = 256; // max iterations
private const double SX = -2.025; // start value real
private const double SY = -1.125; // start value imaginary
private const double EX = 0.6; // end value real
private const double EY = 1.125; // end value imaginary
private static int x1, y1, xs, ys, xe, ye;
private static double xstart, ystart, xende, yende, xzoom, yzoom;
private static float xy;
private int c = 0;
//private Image picture; Taken out, not needed
// create rectangle variable JGB
Rectangle rec;
private Graphics g1;
//private Cursor c1, c2; Taken out, not needed
private System.Drawing.Bitmap bitmap;
public void init()
{
//setSize(640, 480); changed this code to JGB:
this.Size = new Size(640, 480);
// Taken all lines out below. Not needed.
/*finished = false;
addMouseListener(this);
addMouseMotionListener(this);
c1 = new Cursor(Cursor.WAIT_CURSOR);
c2 = new Cursor(Cursor.CROSSHAIR_CURSOR); */
x1 = 640;
y1 = 480;
xy = (float)x1 / (float)y1;
//picture = createImage(x1, y1); Taken out and replaced with JGB:
bitmap = new Bitmap(x1, y1);
//g1 = picture.getGraphics(); changed to get my bitmap
g1 = Graphics.FromImage(bitmap);
//finished = true; Finished variable deleted so not needed
}
//Code below didnt appear to do anything so i deleted it
/*public void destroy() // delete all instances
{
if (finished)
{
removeMouseListener(this);
removeMouseMotionListener(this);
picture = null;
g1 = null;
c1 = null;
c2 = null;
System.gc(); // garbage collection
}
} */
public void start()
{
//action = false;
//rectangle = false;
initvalues();
// added dialog box for instance loading and save varaibles needed for position and zoom to text file
DialogResult dialog = MessageBox.Show("Would You Like to Load Your Last Instance?", "Load Instance?", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question);
if (dialog == DialogResult.Yes)
{
string[] lines = System.IO.File.ReadAllLines(#"C:\Users\Public\Writelines.txt");
xzoom = System.Convert.ToDouble(lines[0]);
yzoom = System.Convert.ToDouble(lines[1]);
xstart = System.Convert.ToDouble(lines[2]);
ystart = System.Convert.ToDouble(lines[3]);
}
else
{
xzoom = (xende - xstart) / (double)x1;
yzoom = (yende - ystart) / (double)y1;
}
mandelbrot();
}
public void stop()
{
}
/*public void paint(Graphics g, PaintEventArgs e)
{
update(g);
}
public void update(Graphics g)
{
//g.DrawImage(picture, 0, 0);
}*/
private void mandelbrot()
{
int x, y;
float h, b, alt = 0.0f;
Color color;
Pen pen = new Pen(Color.Black);
for (x = 0; x < x1; x += 2)
for (y = 0; y < y1; y++)
{
h = pointcolour(xstart + xzoom * (double)x, ystart + yzoom * (double)y, c);
if (h != alt)
{
b = 1.0f - h * h;
color = HSBColor.FromHSB(new HSBColor(h * 255, 0.8f * 255, b * 255));
pen = new Pen(color);
alt = h;
}
g1.DrawLine(pen, x, y, x + 1, y);
}
}
private float pointcolour(double xwert, double ywert, int j)
{
double r = 0.0, i = 0.0, m = 0.0;
// int j = 0;
while ((j < MAX) && (m < 4.0))
{
j++;
m = r * r - i * i;
i = 2.0 * r * i + ywert;
r = m + xwert;
}
return (float)j / (float)MAX;
}
private void initvalues()
{
xstart = SX;
ystart = SY;
xende = EX;
yende = EY;
if ((float)((xende - xstart) / (yende - ystart)) != xy)
xstart = xende - (yende - ystart) * (double)xy;
}
private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g1 = e.Graphics;
g1.DrawImage(bitmap, 0, 0, x1, y1);
using (Pen pen = new Pen(Color.White, 2))
{
e.Graphics.DrawRectangle(pen, rec);
}
Invalidate();
}
//added load method
private void Form1_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
xe = e.X;
ye = e.Y;
if (xs < xe)
{
if (ys < ye) rec = new Rectangle(xs, ys, (xe - xs), (ye - ys));
else rec = new Rectangle(xs, ye, (xe - xs), (ys - ye));
}
else
{
if (ys < ye) rec = new Rectangle(xe, ys, (xs - xe), (ye - ys));
else rec = new Rectangle(xe, ye, (xs - xe), (ys - ye));
}
this.Invalidate();
}
}
private void Form1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
// e.consume();
xs = e.X;
ys = e.Y; // starting point y
this.Invalidate();
}
}
private void Form1_MouseUp(object sender, MouseEventArgs e)
{
rec = new Rectangle(0, 0, 0, 0);
if (e.Button == MouseButtons.Left)
{
int z, w;
//e.consume();
//xe = e.X;
//ye = e.Y;
if (xs > xe)
{
z = xs;
xs = xe;
xe = z;
}
if (ys > ye)
{
z = ys;
ys = ye;
ye = z;
}
w = (xe - xs);
z = (ye - ys);
if ((w < 2) && (z < 2)) initvalues();
else
{
if (((float)w > (float)z * xy)) ye = (int)((float)ys + (float)w / xy);
else xe = (int)((float)xs + (float)z * xy);
xende = xstart + xzoom * (double)xe;
yende = ystart + yzoom * (double)ye;
xstart += xzoom * (double)xs;
ystart += yzoom * (double)ys;
}
xzoom = (xende - xstart) / (double)x1;
yzoom = (yende - ystart) / (double)y1;
mandelbrot();
string stringxzoom = xzoom.ToString();
string stringyzoom = yzoom.ToString();
string stringystart = ystart.ToString();
string stringxstart = xstart.ToString();
string[] lines = { stringxzoom, stringyzoom, stringxstart, stringystart };
System.IO.File.WriteAllLines(#"C:\Users\Public\Writelines.txt", lines);
this.Invalidate();
//Repaint();
}
}
private void restartToolStripMenuItem_Click(object sender, EventArgs e)
{
Application.Restart();
}
private void exitToolStripMenuItem1_Click(object sender, EventArgs e)
{
Application.Exit();
}
private void menuToolStripMenuItem_Click(object sender, EventArgs e)
{
}
private void menuStrip1_ItemClicked(object sender, ToolStripItemClickedEventArgs e)
{
}
}
}
and this is the code that is used for the form designer which was auto generated and I'm not sure why an error is being presented because I've never had one before:
namespace WindowsFormsApplication1
{
partial class Form1
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.components = new System.ComponentModel.Container();
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.Text = "Form1";
}
#endregion
}
}

I believe it is caused because your namespaces are not the same. Since the partial code generated by the designer doesn't inherit from Form, you don't have a method to override. Once you make the two classes tie together properly by matching the namespaces, it should work.
To fix it, you can either change the namespace of the designer code to match your namespace of Form1:
namespace Form1
{
partial class Form1
{
//...
}
}
Or change your form to match the designer:
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
//....
}
}

Edit the project properties and update the Default namespace to match the desired namespace for all forms

Windows Forms -> WPF image control conversion question

I've always worked with Windows Forms, but now I'm trying to learn WPF due to it's advantages. Some time ago I created a picturebox control (with help of Damien here). And for me it's very hard to convert this control into WPF's Image control. I haven't found any appropriate help on the Internet.
My control is used for displaying (founded before) middle between two pages on a scanned image of book. It consists of two moveable points, line between them and areas to the left and to the right filled with semitransparent polygons.
The problem is that WPF is VERY different. It's even hard to draw a filled circle on a Image control.
Here is my code listing:
public partial class SplitPictureBox : System.Windows.Forms.PictureBox
{
public SplitPictureBox()
{
InitializeComponent();
}
private int mPointMoveInProgress = 0;
private int handleRadius = 5;
public int HandleRaduis
{
get { return handleRadius; }
set { handleRadius = value; }
}
private int middleTop = 0;
private int middleBottom = 0;
private int middle;
public int Middle
{
get
{
return (middleTop + middleBottom) /2;
}
set { middle = value; }
}
private double theta;
public double Theta
{
get
{
return (Math.Atan(((middleTop - middleBottom) / (double)this.Height)) * 180) / Math.PI;
}
set
{
theta = value;
int deltaX = (int)((Math.Tan((Math.PI / 180) * value)) * this.Height / 2);
middleTop = middle + deltaX;
middleBottom = middle - deltaX;
}
}
protected override void OnPaint(PaintEventArgs pe)
{
base.OnPaint(pe);
SolidBrush left = new SolidBrush(Color.FromArgb(80, Color.Blue));
SolidBrush right = new SolidBrush(Color.FromArgb(80, Color.Green));
SolidBrush brush = new SolidBrush(Color.Red);
pe.Graphics.FillPolygon(left, new Point[4] { new Point(0,0), new Point(middleTop,0),
new Point(middleBottom, this.Height), new Point(0, this.Height)
});
pe.Graphics.FillPolygon(right, new Point[4] { new Point(this.Width,0), new Point(middleTop,0),
new Point(middleBottom, this.Height), new Point(this.Width, this.Height)
});
// Draw line
pe.Graphics.DrawLine(new Pen(Color.Red, 2), new Point(middleTop, handleRadius), new Point(middleBottom, this.Height - handleRadius));
Rectangle rectangle;
// Draw first handle
rectangle = new Rectangle(middleTop - handleRadius, 0, handleRadius * 2, handleRadius * 2);
pe.Graphics.FillEllipse(brush, rectangle);
// Draw second handle
rectangle = new Rectangle(middleBottom - handleRadius, this.Height - handleRadius * 2, handleRadius * 2, handleRadius * 2);
pe.Graphics.FillEllipse(brush, rectangle);
}
private Point moveLineTop;
private Point moveLineBottom;
protected override void OnMouseDown(MouseEventArgs e)
{
moveLineTop = new Point(e.X - middleTop, 0);
moveLineBottom = new Point(e.X - middleBottom, this.Height);
if (Math.Abs(e.X - middleTop) < handleRadius && Math.Abs(e.Y) <= handleRadius * 2)
{
Cursor.Current = Cursors.Hand;
mPointMoveInProgress = 1;
}
else if (Math.Abs(e.X - middleBottom) < handleRadius && Math.Abs(e.Y - this.Height) <= handleRadius * 2)
{
Cursor.Current = Cursors.Hand;
mPointMoveInProgress = 2;
}
else if (Math.Abs(e.X - x) < handleRadius && e.Y > handleRadius * 2 && e.Y < this.Height - handleRadius * 2)
{
Cursor.Current = Cursors.SizeWE;
mPointMoveInProgress = 3;
}
else mPointMoveInProgress = 0;
base.OnMouseDown(e);
}
private int x = 0;
protected override void OnMouseMove(MouseEventArgs e)
{
x = middleTop - (int)((e.Y * (middleTop - middleBottom)) / (double)this.Height);
if (mPointMoveInProgress == 1)
{
Cursor.Current = Cursors.Hand;
if (e.X > 0 && e.X < this.Width)
{
middleTop = e.X;
Refresh();
}
}
else if (mPointMoveInProgress == 2)
{
Cursor.Current = Cursors.Hand;
if (e.X > 0 && e.X < this.Width)
{
middleBottom = e.X;
Refresh();
}
}
else if (mPointMoveInProgress == 3)
{
if (e.X - moveLineTop.X >= 0 && e.X - moveLineTop.X <= this.Width &&
e.X - moveLineBottom.X >= 0 && e.X - moveLineBottom.X <= this.Width)
{
Cursor.Current = Cursors.SizeWE;
middleTop = e.X - moveLineTop.X;
middleBottom = e.X - moveLineBottom.X;
Refresh();
}
}
else
{
if (Math.Abs(e.X - middleTop) < handleRadius && Math.Abs(e.Y) <= handleRadius * 2)
Cursor.Current = Cursors.Hand;
else if (Math.Abs(e.X - middleBottom) < handleRadius && Math.Abs(e.Y - this.Height) <= handleRadius * 2)
Cursor.Current = Cursors.Hand;
else if (Math.Abs(e.X - x) < handleRadius && e.Y > handleRadius * 2 && e.Y < this.Height - handleRadius * 2)
Cursor.Current = Cursors.SizeWE;
else Cursor.Current = Cursors.Default;
}
base.OnMouseMove(e);
}
protected override void OnMouseUp(MouseEventArgs e)
{
mPointMoveInProgress = 0;
middle = (middleTop + middleBottom) / 2;
base.OnMouseUp(e);
}
}
Could anybody to help me with this? Give me some useful links or code samples.
Thanks!

You are looking for Adorners, they can draw items over other controls, and also handle events, etc.
Some tips:
How to: Implement an Adorner
Adorners How-To Topics

Image splitting into 9 pieces

My Code:
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
ngr.Dispose();
List<Image> list = new List<Image>();
Graphics g = Graphics.FromImage(pictureBox1.Image);
Brush redBrush = new SolidBrush(Color.Red);
Pen pen = new Pen(redBrush,3);
MessageBox.Show(pictureBox1.Image.Width + " " + pictureBox1.Image.Height);
for (int i = 0; i < pictureBox1.Image.Width; i = (pictureBox1.Image.Width / 3) + i)
{
for (int y = 0; y < pictureBox1.Image.Height; y = (pictureBox1.Image.Height / 3) + y)
{
Rectangle r = new Rectangle(i, y, pictureBox1.Image.Width / 3, pictureBox1.Image.Height / 3);
g.DrawRectangle(pen,r );
if (i > 0 && y > 0)
{
if (i + r.Width < pictureBox1.Image.Width && y + r.Height < pictureBox1.Image.Height)
{
list.Add(cropImage(pictureBox1.Image, r));
}
}
}
}
g.Dispose();
pictureBox1.Invalidate();
pictureBox1.Image = list[0];
}
private static Image cropImage(Image img, Rectangle cropArea)
{
Bitmap bmpImage = new Bitmap(img);
Bitmap bmpCrop = bmpImage.Clone(cropArea, System.Drawing.Imaging.PixelFormat.DontCare);
return (Image)(bmpCrop);
}
This Code adds only 2 pieces to the list but not the other 7 pieces.
Please Help!!

Change this part of code and try again:
for (int i = 0; i < 3; i++)
{
for (int y = 0; y < 3; y++)
{
Rectangle r = new Rectangle(i*(pictureBox1.Image.Width / 3),
y*(pictureBox1.Image.Height / 3),
pictureBox1.Image.Width / 3,
pictureBox1.Image.Height / 3);
g.DrawRectangle(pen,r );
list.Add(cropImage(pictureBox1.Image, r));
}
}