How to Use Paint and the Graphics in C#

How to Use Paint and the  Graphics

Before you can draw lines and shapes, render text, or display and manipulate images with GDI+, you need to create a graphics object. The graphics object represents a GDI+ drawing surface, and is the object that is used to create graphical lines.

There are two steps in working with graphics:

1.    Creating a graphics

2.     object.

3.    Using the graphics

4.     object to draw lines and shapes, render text, or display and manipulate images.

C#(Code).......

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Threading.Tasks;

namespace How_to_Use_Paint_and_the__Graphics

{

    public partial class Form1 : Form

    {

        Pen mypen = new Pen(Color.Black);

        Graphics g = null;

        static int center_1, center_y;

        static int Start_x, Start_y;

        static int end_x, end_y;

        static int my_angel = 0;

        static int My_Leanth = 0;

        static int number_lines=0;

        static int My_icrement = 0;

        public Form1()

        {

            InitializeComponent();

            Start_x = canvas.Width / 2;

            Start_y = canvas.Height / 2;

        }

        private void canvas_Paint(object sender, PaintEventArgs e)

        {

            mypen.Width = 1;

            My_Leanth=Int32.Parse(Leanth.Text);

            g = canvas.CreateGraphics();

            for (int i=0; i<Int32.Parse(Number_Of_lines.Text); i++)

            DrawLine();

        }

        private void DrawLine()

        {

            Random randamgren = new Random();

            mypen.Color = Color.FromArgb(randamgren.Next(255), randamgren.Next(255), randamgren.Next(255));

            my_angel = my_angel + Int32.Parse(Angel.Text);

            My_Leanth = My_Leanth + Int32.Parse(Leanth.Text);

            end_x=(int)(Start_x + Math.Cos(my_angel *.017453292519) * My_Leanth);

            end_y = (int)(Start_y + Math.Sin(my_angel * .017453292519) * My_Leanth);

            Point[] points =

        {

        new Point(Start_x,Start_y),

        new Point(end_x,end_y)

        

        };

            Start_x = end_x;

            Start_y = end_y;

            g.DrawLines(mypen,points);

        }

        private void button1_Click(object sender, EventArgs e)

        {

            My_Leanth = Int32.Parse(Leanth.Text);

            My_icrement = Int32.Parse(Increment.Text);

            my_angel = Int32.Parse(Leanth.Text);

            Start_x = canvas.Width / 2;

            Start_y = canvas.Height / 2;

            canvas.Refresh();

        }

        private void Form1_Load(object sender, EventArgs e)

        {

        }

      

    }

}