Calling Form1_Paint method

Christian L

I want to be able to draw an Ellipse at any point on a pictureBox that I click on. The problem is calling up the method that has the code to draw the ellipse. Thanks for your help in advance.

public partial class Form1 : Form
{
Graphics graphics;
string XStr, YStr;
Pen blackPen = new Pen(Color.Black, 3);
Rectangle rect = new Rectangle(200, 200, 200, 100);

public Form1()
{
InitializeComponent();
pictureBox1.MouseUp += new MouseEventHandler(OnMouseup);
}
public void Form1_Load(object sender, EventArgs e)
{

}
private void Form1_Paint(object sender, PaintEventArgs e)
{
Pen blackPen = new Pen(Color.Black, 3);
Rectangle rect = new Rectangle(200, 200, 200, 100);
e.Graphics.DrawEllipse(blackPen, rect);

}
private void pictureBox1_Click(object sender, EventArgs e)
{

}
public void OnMouseup(object sender,MouseEventArgs e)
{

graphics.DrawEllipse(blackPen, 10, 10, 20, 10);
/*
* XStr = Convert.ToString(e.X);
YStr = Convert.ToString(e.Y);
textBox1.Text = (XStr);
textBox2.Text = (YStr);
*/
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
}
private void textBox2_TextChanged(object sender, EventArgs e)
{
}

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

Mahesh Chand16y ago
You need to use the CreateGraphics() method of Form to create a dynamic Graphics object.

Graphics g = this.CreateGraphics();

Now you can use this g anywhere.

Here is a sample:

http://www.c-sharpcorner.com/UploadFile/Nildo%20Soares%20de%20Araujo/RubberBandLinesNShapes10172005044356AM/RubberBandLinesNShapes.aspx
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Kirtan Patel16y ago
Friend,

Here is Code for it

please check "Do you like this answer" check box if it helps you :)

thanks :)

public partial class Form1 : Form

    {

        Boolean IsMouseDown = false;

        int x;

        int y;

        int xmousedownpoint;

        int ymousedownpoint;

        Graphics g;

        public Form1()

        {

            InitializeComponent();

        }

        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)

        {

            xmousedownpoint = e.X;

            ymousedownpoint = e.Y;

            IsMouseDown = true;

        }

        private void pictureBox1_MouseUp(object sender, MouseEventArgs e)

        {

            x = e.X;

            y = e.Y;

            IsMouseDown = false;

        }

        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)

        {

            if (IsMouseDown == true)

            {

                x = e.X;

                y = e.Y;

            }

        }

        private void pictureBox1_Paint(object sender, PaintEventArgs e)

        {

            g = e.Graphics;

            Pen p = new Pen(new SolidBrush(Color.Red));

            g.DrawEllipse(p, xmousedownpoint, ymousedownpoint, xmousedownpoint - x, ymousedownpoint - y);

            pictureBox1.Invalidate();

        }

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