zoom کردن در فرم اصلی



public partial class Form1 : Form

{

    Graphics myGraphics;



    public Form1()

    {

        InitializeComponent();

        this.Shown += new EventHandler(Form1_Shown);

    }



    void Form1_Shown(object sender, EventArgs e)

    {

        Button ButtonZoomIn = new Button();

        ButtonZoomIn.Text = "Zoom In";

        ButtonZoomIn.Location = new Point(0, 0);

        Controls.Add(ButtonZoomIn);



        Button ButtonZoomOut = new Button();

        ButtonZoomOut.Text = "Zoom Out";

        ButtonZoomOut.Location = new Point(100, 0);

        Controls.Add(ButtonZoomOut);



        ButtonZoomIn.Click += (s, args) =>

        {

            drawRectangle();

            myGraphics.ScaleTransform(2.0F, 2.0F);

            drawRectangle();

        };



        ButtonZoomOut.Click += (s, args) =>

        {

            drawRectangle();

            myGraphics.ScaleTransform(0.5F, 0.5F);

            drawRectangle();

        };



        myGraphics = this.CreateGraphics();

        drawRectangle();

    }



    void drawRectangle()

    {

        myGraphics.Clear(this.BackColor);

        Rectangle rect = new Rectangle(50, 50, 100, 100);

        SolidBrush brush = new SolidBrush(Color.Black);

        myGraphics.FillRectangle(brush, rect);

    }

}