Click here to Skip to main content
15,352,236 members
Please Sign up or sign in to vote.
3.00/5 (2 votes)
See more:
Hi friends,
Now I am working in C .i am looking for Picture Zoom In and Zoom Out in C#.Net. My Properties are Form,Picture Box and Tool strip .In that Tool strip ,3 buttons are in that Tool strip one is Zoom In ,another One is Zoom Out and Close.i insert a JPEG File in picture box.if i click Zoom In button.Image will Zoom In.and click Zoom Out button .Image will Zoom Out how to do this?Please I want a Code for these issue.please help me.
Lakshmi Narayanan.S
Updated 7-Nov-21 6:08am
There is not such thing as C#.NET.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication5
    public partial class Form1 : Form
        public Form1()

        private Image imgOriginal;

        private void Form1_Load(object sender, EventArgs e)
                             // set Slider Attributes
                               zoomSlider.Minimum = 1;
                                zoomSlider.Maximum = 5;
                                  zoomSlider.SmallChange = 1;
                                   zoomSlider.LargeChange = 1;
                                    zoomSlider.UseWaitCursor = false;
                   // reduce flickering
                 this.DoubleBuffered = true;
        public Image PictureBoxZoom(Image img, Size size)
            imgOriginal = Image.FromFile(openFileDialog1.FileName);
            Bitmap bm = new Bitmap(imgOriginal, Convert.ToInt32(imgOriginal.Width * size.Width), Convert.ToInt32(imgOriginal.Height * size.Height));
            Graphics grap = Graphics.FromImage(bm);
            //grap.InterpolationMode = InterpolationMode.HighQualityBicubic;
            return bm;

        private void zoomSlider_Scroll(object sender, EventArgs e)
            if (zoomSlider.Value > 0)
                picBox.Image = null;
                picBox.Image = PictureBoxZoom(imgOriginal, new Size(zoomSlider.Value, zoomSlider.Value));

        private void button1_Click(object sender, EventArgs e)
            DialogResult res = MessageBox.Show("Message", "Try", MessageBoxButtons.YesNo);
            if (res == DialogResult.Yes)
                string imagepath = openFileDialog1.FileName;
                picBox.ImageLocation = imagepath;
                MessageBox.Show("picture cancelled", "message");

For Zooming In :

pictureBox1.Top= (int)(pictureBox1.Top - (pictureBox1.Height * 0.025));
pictureBox1.Left = (int)(pictureBox1.Left - (pictureBox1.Width * 0.025));
pictureBox1.Height = (int)(pictureBox1.Height + (pictureBox1.Height* 0.05));
pictureBox1.Width = (int)(pictureBox1.Width + (pictureBox1.Width * 0.05));

For Zooming Out :

pictureBox1.Top = (int)(pictureBox1.Top + (pictureBox1.Height * 0.025));
pictureBox1.Left = (int)(pictureBox1.Left + (pictureBox1.Width * 0.025));
pictureBox1.Height = (int)(pictureBox1.Height - (pictureBox1.Height* 0.05));
pictureBox1.Width = (int)(pictureBox1.Width - (pictureBox1.Width * 0.05));
Google is your friend: Be nice and visit him often. He can answer questions a lot more quickly than posting them here...

There is an article here: PictureBox Zoom[^] - which you would have found, if you had tried even a basic google...
naraayanan 2-Jun-11 1:43am
Thanks friend.In this example,using 2 picture box But i want to do this in one Picture box.Please help me.
Lakshmi narayanan.S
OriginalGriff 2-Jun-11 3:12am
Read the code: the article shows the technique, not a specific solution to your problem: you are expected to do something for yourself! :laugh:
naraayanan 2-Jun-11 3:24am
I tried .But i didn't.So Please help me.
OriginalGriff 2-Jun-11 3:38am
What part of it did you not understand?
naraayanan 2-Jun-11 7:39am
In that Program,there are 2 methods are used in the program.But i didn't understand 2 one(UpdateZoomedImage)
Lakshmi Narayanan.S
Please help me
OriginalGriff 2-Jun-11 8:52am
It's pretty well commented, and I'm not sure there is a lot I can add: the only bit you need to change is the source location which comes in as a MouseEventArgs, and the source bitmap which comes from a PictureBox. Neither of those are exactly complicated changes...
ariandoll 29-Apr-13 3:08am
How to ZOOM Images displayed in picturebox other than slider tool (TRACKBAR TOOL) in Windows Application?
OriginalGriff 29-Apr-13 3:48am
Up to your UI - you might want to think about the mouse scroll wheel perhaps?
Zooming an image is far easier to control if you don't use a picture box. Again, google is your friend.
in VB.Net :
Private Sub Zoom(ByVal factor As Double)
    Dim img_ As Image
    img_ = PictureBox1.Image
    Dim srcbtm As New Bitmap(img_)
    Dim destbtm As New Bitmap(CInt(srcbtm.Width * factor), _
        CInt(srcbtm.Height * factor))
    Dim destGraphic As Graphics = Graphics.FromImage(destbtm)

    destGraphic.DrawImage(srcbtm, 0, 0, destbtm.Width + 1, _
        destbtm.Height + 1)
    PictureBox1.Image = destbtm
End Sub
luisvaldez 5-Nov-12 7:32am
This isn't a Zoom... this is just a resize...

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

  Print Answers RSS
Top Experts
Last 24hrsThis month

CodeProject, 20 Bay Street, 11th Floor Toronto, Ontario, Canada M5J 2N8 +1 (416) 849-8900