Crop bmp image into 2 pieces and 3 pieces

Question

Hi!
1. I want to crop a bmp image into 2 pieces and show the two cop image in 2 picturebox.
2. I want to crop a bmp image into 3 pieces and show theme in 3 picturebox.
Can anyone help me?

Answer 1

Hi,
put three pictureboxes to a Form named Form1
public Form1()
InitializeComponent();
//create an image
Bitmap bmp = new Bitmap(1024, 768);
//draw something to it
using (Graphics g = Graphics.FromImage(bmp))
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
g.Clear(Color.Green);
g.FillEllipse(Brushes.Yellow, new Rectangle(0, 0, bmp.Width, bmp.Height));
//and crop ionto the array
Bitmap[] bmps = CropIntoThree(bmp);
this.pictureBox1.SizeMode = this.pictureBox2.SizeMode = this.pictureBox3.SizeMode = PictureBoxSizeMode.Zoom;
if(bmps[0] != null)
this.pictureBox1.Image = bmps[0];
if(bmps[1] != null)
this.pictureBox2.Image = bmps[1];
if(bmps[2] != null)
this.pictureBox3.Image = bmps[2];
private Bitmap[] CropIntoThree(Bitmap bmp)
Bitmap[] bmps = new Bitmap[3];
//get a third of the width
int third = (int)Math.Ceiling(bmp.Width / 3.0);
for (int i = 0; i < 3; i++)
//if the last third should be smaller (by 1 or 2 pixels, you could use the modulo operator here too)
if (i * third + third > bmp.Width)
third = bmp.Width - i * third;
bmps[i] = bmp.Clone(new Rectangle(i * third, 0, third, bmp.Height), bmp.PixelFormat);
return bmps;
[And dont forget to Dispose the bitmaps when you do not need them anymore, e.g. in the FormClosing event.]
Regards,
  Thorsten