Thread: Simple graphics in win forms

Hey

What is the easiest way to make simple graphical figures in Win forms (basic geometrical figures like rectangles, triangles, circles etc.).

TNX

Get a DC to some component (probably the form itself) and paint to it. Check out the Graphics class on msdn.

As mentioned use the Graphics class built into .net. It's basically a GDI+ wrapper and once you get into it, you can have a lot of fun. Here's a little starter to point you in the right direction.

Code:

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

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            this.Paint += new PaintEventHandler(Form1_Paint);
        }

        void Form1_Paint(object sender, PaintEventArgs e)
        {
            Graphics g = e.Graphics;
            g.FillRectangle(Brushes.Green, new Rectangle(0, 0, 100, 100));
            g.FillEllipse(Brushes.Red, new Rectangle(10, 10, 50, 50));
        }
    }
}

How can I use these graphics as "marks" on the form (e.g when I click on it, a label or a textbox shows the size of the rectangle in pixels).

Well, when you draw a rectangle you also save it's size. Then on a mouse event handler you see if that point is inside of the rectangle. If it's inside the rectangle, use that rectangles dimensions to set the Text property of some control.