using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Labs8
{
    public partial class Form1 : Form
    {

        private System.Drawing.Graphics g;
        private System.Drawing.Pen pen1 = new System.Drawing.Pen(Color.Blue, 1);
        private System.Drawing.Pen pen2 = new System.Drawing.Pen(Color.Red, 2);
        public Form1()
        {
            InitializeComponent();
            g = pictureBox1.CreateGraphics();
        }


       // Bitmap bm;
        private void button1_Click(object sender, EventArgs e)
        {

           // int x = pictureBox1.Width;
           // int y = pictureBox1.Height;
            //bm = new Bitmap(x, y);

            //Graphics gr = Graphics.FromImage(bm);

            //1
            for (int i = 0; i < 101; i++)
            {
                for(int j = 0; j < 101; j++)
                {
                    int u = (int)(i * 255.0 / 100);
                    int v = (int)(j * 255.0 / 100);
                    pen1.Color = Color.FromArgb(255 - u, 0, v);
                    g.DrawRectangle(pen1, 0 + i, 0 + j, 1, 1);

                }
            }
            //2
            for (int i = 0; i < 101; i++)
            {
                for(int j = 0; j < 101; j++)
                {
                    int u = (int)(i * 255.0 / 100);
                    int v = (int)(j * 255.0 / 100);
                    pen1.Color = Color.FromArgb(255 - u, 255, v);
                    g.DrawRectangle(pen1, 101 + i, j, 1, 1);

                }
            }
            //3
            for (int i = 0; i < 101; i++)
            {
                for(int j = 0; j < 101; j++)
                {
                    int u = (int)(i * 255.0 / 100);
                    int v = (int)(j * 255.0 / 100);
                    pen1.Color = Color.FromArgb(255 - u, v, 0);
                    g.DrawRectangle(pen1, 201 + i, j, 1, 1);

                }
            }
            //4
            for (int i = 0; i < 101; i++)
            {
                for(int j = 0; j < 101; j++)
                {
                    int u = (int)(i * 255.0 / 100);
                    int v = (int)(j * 255.0 / 100);
                    pen1.Color = Color.FromArgb(255 - u, v, 255);
                    g.DrawRectangle(pen1, 301 + i, j, 1, 1);


                }
            }
            //5
            for (int i = 0; i < 101; i++)
            {
                for(int j = 0; j < 101; j++)
                {
                    int u = (int)(i * 255.0 / 100);
                    int v = (int)(j * 255.0 / 100);
                    pen1.Color = Color.FromArgb(u, 255 - v, 0);
                    g.DrawRectangle(pen1, 401 + i, j, 1, 1);

                }
            }
            for (int i = 0; i < 101; i++)
            {
                for(int j = 0; j < 101; j++)
                {
                    int u = (int)(i * 255.0 / 100);
                    int v = (int)(j * 255.0 / 100);
                    pen1.Color = Color.FromArgb(u, 255 - v, 255);
                    g.DrawRectangle(pen1, 501 + i, j, 1, 1);

                }
            }
            //pictureBox1.Image = bm;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            label1.Text = "Red : " + trackBar1.Value.ToString();
            label2.Text = "Blue : " + trackBar2.Value.ToString();
            label3.Text = "Green : " + trackBar3.Value.ToString();
            for (int i = 0; i < 101; i++)
            {
                for (int j = 0; j < 101; j++)
                {
                    pen1.Color = Color.FromArgb(trackBar1.Value, trackBar3.Value, trackBar2.Value);
                    g.DrawRectangle(pen1, 0+i, 202 + j , 1, 1);
                }
            }

        }

        private void button3_Click(object sender, EventArgs e)
        {
            for (int i = 0; i < 101; i++)
            {
                for (int j = 0; j < 101; j++)
                {
                    int m1 = 255 - trackBar1.Value;
                    int m2 = 255 - trackBar2.Value;
                    int m3 = 255 - trackBar3.Value;

                    label4.Text = "CMYK RED: " + m1.ToString();
                    label5.Text = "CMYK BLUE: " + m2.ToString();
                    label6.Text = "CMYK GREEN: " + m3.ToString();
                }
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void label4_Click(object sender, EventArgs e)
        {

        }
        private void button4_Click(object sender, EventArgs e)
        {

        }
    }
}
grafika8.cs
Displaying grafika8.cs.