Bitmap Zoom Problem

Hi Friends,

I have written code for zooming bitmap and mouse drawing. The code is given below. Everything is working fine. But I find there is a strange behaviour like, when I feed the bitmap size 20 x 20 pixels, the zoomed bitmap shows only 19.5 x 19.5. Where is the half pixel is gone, else why the half pixel is not shown like other pixels. The first x pixel and first y pixel turned to be with this problem. I want to display all the pixels with equal size. Please help me. Also advise me how to avoid flickering when the image is drawn on the panel.

Code:

sing System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.Drawing.Drawing2D;

using System.Drawing.Design;

namespace WindowsApplication1

{

publicpartialclassForm1 :Form

Bitmap bmp;

Graphics gp;

Point prePoint, curPoint;

Pen pen;

public Form1()

{

InitializeComponent();

bmp =newBitmap(10, 10);

gp =Graphics.FromImage(bmp);

pen =newPen(Color.Red);

this.DoubleBuffered =true;

}

privatevoid panel1_MouseDown(object sender,MouseEventArgs e)

{

if (e.Button ==MouseButtons.Left)

prePoint =newPoint((1 + e.X / 10), (1 + e.Y / 10));

}

privatevoid panel1_MouseMove(object sender,MouseEventArgs e)

{

if (e.Button ==MouseButtons.Left)

curPoint =newPoint((1 + e.X / 10), (1 + e.Y / 10));

draw(e);

prePoint = curPoint;

this.panel1.Invalidate();

}

privatevoid draw(MouseEventArgs e)

{

privatevoid panel1_Paint(object sender,PaintEventArgs e)

{

Graphics gpp = e.Graphics;

gpp.InterpolationMode =InterpolationMode.NearestNeighbor;

gpp.ScaleTransform(10.0f, 10.0f);

gpp.DrawImage(bmp, 0, 0);

}

}

}

[5161 byte] By [RR_14] at [2008-1-9]