Question

How to draw a circle inside a box with random colors in Windows Forms (WinForms) C#

Answer 1

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

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int row = 7;
            int column = 3;

            Random rnd = new Random();

            flowLayoutPanel1.Width = (row * 60) + 1;
            flowLayoutPanel1.Height = (column * 60) + 1;

            Graphics graphics = flowLayoutPanel1.CreateGraphics();

            Pen pen = new Pen(Color.Black);

            for (int j = 0; j < column; j++)
            {
                for (int i = 0; i < row; i++)
                {
                    Rectangle rectangle = new Rectangle(60 * i, 60 * j, 60, 60);
                    pen.Color = Color.FromArgb(rnd.Next(0, 255), rnd.Next(0, 255), rnd.Next(0, 255));
                    graphics.DrawEllipse(pen, rectangle);
                    pen.Color = Color.FromArgb(rnd.Next(0, 255), rnd.Next(0, 255), rnd.Next(0, 255));
                    graphics.DrawRectangle(pen, rectangle);
                }
            }
            pen.Dispose();
        }
    }
}

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