draw filled circle in WinForms C#

c# draw circle
c# draw ellipse
c# drawing shapes
c# draw circle on panel
c# draw circle with center and radius
how to draw circle in asp net c#
windows forms drawing
vb net draw circle filled

I have a WinForms application that interacts with a connection. If the connection is fine I want to show a green ("everything is fine") filled circle, if not I want to show a red filled circle.

I found no circle element in the toolbox so I think I have to draw it on my own.

I created a picture box called picBoxClientState and started with this code

public partial class FrmMain : Form
{
    public void CheckSignedInState()
    {
        // some other code

        DrawClientStateIcon(client.IsSignedIn);
    }

    private void DrawClientStateIcon(bool isSignedIn)
    {
        Point rectangleLocation = picBoxClientState.Location;
        Size rectangleSize = picBoxClientState.Size;
        Rectangle rectangle = new Rectangle(rectangleLocation, rectangleSize);

        Color iconColor = isSignedIn ? Color.Green : Color.Red;
        SolidBrush iconBrush = new SolidBrush(iconColor);

        Graphics graphics = picBoxClientState.CreateGraphics();
        graphics.FillEllipse(iconBrush, rectangle);
    }
}

How can I draw on this picturebox whenever I call CheckSignedInState() ?

Maybe there is a better way instead of drawing? (I don't want to toggle two images because there might be more states to draw)

A simple example using a Label control to draw an ellipse. You can use any control that has a Paint() event to draw some shapes. It could also be a Panel, a PictureBox, a Button...

A bool variable (ClientIsSignedIn) declared at Class scope is used to keep track of the current status, as reported by your client.IsSignedIn value.

When the status changes, update ClientIsSignedIn and Invalidate() the Control that provides the visual aid.

bool ClientIsSignedIn = false;

public void CheckSignedInState()
{
    // some other code
    ClientIsSignedIn = client.IsSignedIn;
    lblVisualStatus.Invalidate();
}

private void lblVisualStatus_Paint(object sender, PaintEventArgs e)
{
    e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
    e.Graphics.FillEllipse((ClientIsSignedIn) ? Brushes.Green : Brushes.Red, ((Control)sender).ClientRectangle);
}

draw filled circle in WinForms C# - MSDN, A simple example using a Label control to draw an ellipse. You can use any control that has a Paint() event to draw some shapes. It could also be a Panel , a PictureBox , a Button A bool variable ( ClientIsSignedIn ) declared at Class scope is used to keep track of the current status, as reported by your client. Dim myBrush As New System.Drawing.SolidBrush(System.Drawing.Color.Red) Dim formGraphics As System.Drawing.Graphics formGraphics = Me.CreateGraphics() formGraphics.FillEllipse(myBrush, New Rectangle(0, 0, 200, 300)) myBrush.Dispose() formGraphics.Dispose() Compiling the Code. You cannot call this method in the Load event handler. The drawn content will not be redrawn if the form is resized or obscured by another form.

I don't think picture box is necessary. You can try something like this:

private void button1_Click(object sender, EventArgs e)
{
    System.Drawing.SolidBrush myBrush = new 
    System.Drawing.SolidBrush(System.Drawing.Color.Red);
    System.Drawing.Graphics formGraphics;
    formGraphics = this.CreateGraphics();
    formGraphics.FillEllipse(myBrush, new Rectangle(200, 200, 30, 30));
    myBrush.Dispose();
    formGraphics.Dispose();
}

If you need to draw on picturebox be sure to call picturebox.Invalidate();

draw filled circle in WinForms C#, Drawing a filled circle is easy: just get the Image control from your picturebox and use the FillEllipse method: Hide Copy Code. Image i  Dim myBrush As New System.Drawing.SolidBrush(System.Drawing.Color.Red) Dim formGraphics As System.Drawing.Graphics formGraphics = Me.CreateGraphics() formGraphics.FillRectangle(myBrush, New Rectangle(0, 0, 200, 300)) myBrush.Dispose() formGraphics.Dispose() Compiling the Code. You cannot call this method in the Load event handler. The drawn content will not be redrawn if the form is resized or obscured by another form.

your code works, it did seem to draw a bit off center though but also the fact that you weren't disposing of the object could potentially cause issues too. Try using the code below as your DrawClientStateIcon method

Edit: full code example below. I added a button to toggle the state of the client and this works for me.

using System;
using System.Drawing;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public class Client
        {
            public bool IsSignedIn { get; set; }
        }

        Client client = new Client()
        {
            IsSignedIn = false
        };

        public Form1()
        {
            InitializeComponent();
        }

        public void CheckSignedInState()
        {
            // some other code

            DrawClientStateIcon(client.IsSignedIn);
        }

        private void DrawClientStateIcon(bool isSignedIn)
        {
            Point rectangleLocation = picBoxClientState.Location;
            Size rectangleSize = picBoxClientState.Size;
            Rectangle rectangle = new Rectangle(rectangleLocation, new Size(rectangleSize.Width / 2, rectangleSize.Height / 2));

            Color iconColor = isSignedIn ? Color.Green : Color.Red;

            using (SolidBrush iconBrush = new SolidBrush(iconColor))
            {
                using (Graphics graphics = picBoxClientState.CreateGraphics())
                {
                    graphics.FillEllipse(iconBrush, rectangle);
                }
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            client.IsSignedIn = !client.IsSignedIn;
            CheckSignedInState();
        }
    }
}

draw a fill circle on PictureBox, Here, I added two items like a circle and a rectangle for displaying their shapes within the form. Visual studio. PANEL CONTROL Panel creates a  Sub Controls in Panel:The entire point of the panel is to provide a visual and logical grouping for controls.To add some control, drag them to the inner part of the panel in Visual Studio. Here panel control is used to display the shapes given in the ListBox. STEP 3 - Coding. Follow the code given below in the Screenshot. When the circle is

You need to call it in Form Shown event.

        private void FrmGraphics_Shown(object sender, EventArgs e)
        {
            DrawClientStateIcon(true);
        }
        private void DrawClientStateIcon(bool isSignedIn)
        {
            Point rectangleLocation = picBoxClientState.Location;
            Size rectangleSize = picBoxClientState.Size;
            Rectangle rectangle = new Rectangle(rectangleLocation, rectangleSize);

            Color iconColor = isSignedIn ? Color.Green : Color.Red;
            SolidBrush iconBrush = new SolidBrush(iconColor);

            Graphics graphics = base.CreateGraphics();
            graphics.FillEllipse(iconBrush, rectangle);
        }

How To Draw Shapes Inside Panel Control In Winforms , Drawing shapes in C# - Visual Studio 2013 Moving shapes on part 2. Part 2: https://www Duration: 6:41 Posted: Dec 1, 2014 In order to draw shapes in C# a start point and end point coordinates, and a Pen control must be defined first. Coordinates in C#. The value of x is the location of the point along the x-axis, the 0 is at the extreme left. The value of y is the location of the point along the y-axis, the 0 is at the extreme top.

C# draw shape - circle and rectangle - Part 1, Drawing in C# is achieved using the Graphics Object. to change the style of line (i.e Dash, DashDot, DashDotDot, Dot, Solid or Custom). Ellipses and circles are drawn in C# using the DrawEllipse() method of the GraphicsObject class. how can i draw a circle in c# windows form( half colored and half not) i know how draw circle but i cant color it i hope you understand me and this how i draw circle

Drawing Graphics in C Sharp, DrawArc Method is used to draw an arc representing a portion of an ellipse specified by a pair of coordinates, a width, and a C# program to draw a circle. Sooner or later a Csharp snippet had to appear. This one builds a form containing a set of buttons. A bitmap drawing area is used to draw a series of circles with random color, radius and center location.

Graphics.DrawArc() Method in C# with Examples, After creating the clipping region (see the previous example for details), the program uses the following code to draw the random circles. //  A closed shape, such as a rectangle or an ellipse, consists of an outline and an interior. The outline is drawn with a pen and the interior is filled with a brush. GDI+ provides several brush classes for filling the interiors of closed shapes: SolidBrush, HatchBrush, TextureBrush, LinearGradientBrush, and PathGradientBrush.

Comments
  • you can use power pack to easily create oval shapes
  • sorry I just want to draw on this picture box. There is nothing drawn on it although the debugger reaches this code.
  • Never use CreateGraphics() to paint. The iconColor variable must be a field of the class. Use the pb's Paint event to draw. When you change iconColor then call the pb's Invalidate() method so it repaints.
  • so if I want to paint again I just call Invalidate()?
  • Yes. Change the data used when drawing and call Invalidate on the control that should Paint.
  • You cannot call this in Load() method of your form, you need to call it from a button.
  • but why? where is the difference? I just call a method, no?
  • When the form uses Load() it does redraw/Invalidate/Paint a while later, this is where you lose information about your circle. To prevent this you would need to draw your circle in Paint event. Check this: Paint
  • This works well for me. The using FillEllipse and passing a Brush. (As opposed to DrawEllipse and passing a pen, which only made a hoollow ellipse). I used the paint event , made use of (PaintEventArgs e), and did e.Graphics.FillEllipse etc.
  • hm no sorry, nothing gets drawn
  • are you sure your code is being hit? I tried your code and it worked for me toggling the client login state with a button, I will edit my code to show the full example
  • Yes the debugger hits the line of code. I will try your code snippet in a new project maybe something is missing
  • I just tested your code in a new project. I placed a button and a picture box on the form and copy pasted your code. The debugger reaches the line of code but nothing gets drawn.
  • Repeating errors from OP (CreateGraphics) is not helpful Hans's advice is all that is needed. I think you should delete this misleading answer!