Basic Paint Form : Mouse Draw : Drawing 2D C# Examples

    
using  System;
using  System.Drawing;
using  System.Collections;
using  System.ComponentModel;
using  System.Windows.Forms;
using  System.Data;
using  System.Drawing.Drawing2D;

public  class  FormBasicPaintMouseClick  :  System.Windows.Forms.Form
{
    private  System.ComponentModel.Container  components  =  null;
    private  System.Windows.Forms.Button  btnRenderedButton;
    private  System.Windows.Forms.Button  btnRenderToOtherButton;
    private  ArrayList  myPts  =  new  ArrayList();

    public  FormBasicPaintMouseClick()
    {
        InitializeComponent();
    }

    protected  override  void  Dispose(  bool  disposing  )
    {
        if(  disposing  )
        {
            if  (components  !=  null)  
            {
                components.Dispose();
            }
        }
        base.Dispose(  disposing  );
    }
    private  void  InitializeComponent()
    {
        this.btnRenderedButton  =  new  System.Windows.Forms.Button();
        this.btnRenderToOtherButton  =  new  System.Windows.Forms.Button();
        this.SuspendLayout();
        //  
        //  btnRenderedButton
        //  
        this.btnRenderedButton.Location  =  new  System.Drawing.Point(168,  120);
        this.btnRenderedButton.Name  =  "btnRenderedButton";
        this.btnRenderedButton.Size  =  new  System.Drawing.Size(112,  136);
        this.btnRenderedButton.TabIndex  =  0;
        this.btnRenderedButton.Text  =  "Click  on  other  button!";
        //  
        //  btnRenderToOtherButton
        //  
        this.btnRenderToOtherButton.Location  =  new  System.Drawing.Point(168,  8);
        this.btnRenderToOtherButton.Name  =  "btnRenderToOtherButton";
        this.btnRenderToOtherButton.Size  =  new  System.Drawing.Size(112,  56);
        this.btnRenderToOtherButton.TabIndex  =  1;
        this.btnRenderToOtherButton.Text  =  "Render  to  button";
        //  
        //  FormBasicPaintMouseClick
        //  
        this.AutoScaleBaseSize  =  new  System.Drawing.Size(5,  13);
        this.ClientSize  =  new  System.Drawing.Size(292,  273);
        this.Controls.Add(this.btnRenderToOtherButton);
        this.Controls.Add(this.btnRenderedButton);
        this.Name  =  "FormBasicPaintMouseClick";
        this.StartPosition  =  System.Windows.Forms.FormStartPosition.CenterScreen;
        this.Text  =  "Basic  Paint  Form";
        this.MouseDown  +=  new  System.Windows.Forms.MouseEventHandler(this.FormBasicPaintMouseClick_MouseDown);
        this.Paint  +=  new  System.Windows.Forms.PaintEventHandler(this.FormBasicPaintMouseClick_Paint);
        this.ResumeLayout(false);

    }

    [STAThread]
    static  void  Main()  
    {
        Application.Run(new  FormBasicPaintMouseClick());
    }

    private  void  FormBasicPaintMouseClick_MouseDown(object  sender,  System.Windows.Forms.MouseEventArgs  e)
    {
        myPts.Add(new  Point(e.X,  e.Y));
        Invalidate();
    }

    private  void  FormBasicPaintMouseClick_Paint(object  sender,  System.Windows.Forms.PaintEventArgs  e)
    {
        Graphics  g  =  e.Graphics;
        foreach(Point  p  in  myPts)
            g.DrawEllipse(new  Pen(Color.Green),  p.X,  p.Y,  10,  10);
    }
}