Drawing a Rectangle at Runtime

This Blog is Mainly intended to Draw a rectangle or Square at Runtime using the MouseDown, MouseUp, MouseMove and the Paint Events of the Form. and I am adding the Code at Button Click inorder to save all the Rectangles user selected in to a list.

This Blog is Mainly intended to Draw a rectangle or Square at Runtime using the MouseDown, MouseUp, MouseMove and the Paint Events of the Form. The User can draw a Rectangle at runtime to what ever size rectangle he can want to draw. So, finally a rectangle Object from the Rectangle class will be resultant using which the user can make the remaining actions.

        bool canResize;
        int mX, mY;
        Rectangle rect = new Rectangle();
        RectangleShape[] rec = new RectangleShape[20];
        RectangleShape TempRec;
        int RecCount = 0;
        public Form2()
        {
            InitializeComponent();
        }
 
        private void Form2_Paint(object sender, PaintEventArgs e)
        {
            e.Graphics.DrawRectangle(new Pen(Brushes.Purple, 2), rect);
        }
 
        private void Form2_MouseDown(object sender, MouseEventArgs e)
        {
            canResize = true;
            mX = e.X; mY = e.Y;
            rect.Location = new Point(mX, mY);
        }
 
        private void Form2_MouseUp(object sender, MouseEventArgs e)
        {
            canResize = false;
            button1.Enabled = true;
        }

        private void Form2_MouseMove(object sender, MouseEventArgs e)
        {
            if (canResize)
            {
                if (mX < e.X)
                {
                    rect.X = mX;
                    rect.Width = e.X - mX;
                }
                else
                {
                    rect.X = e.X;
                    rect.Width = mX - e.X;
                }
                if (mY < e.Y)
                {
                    rect.Y = mY;
                    rect.Height = e.Y - mY;
                }
                else
                {
                    rect.Y = e.Y;
                    rect.Height = mY - e.Y;
                }
                this.Invalidate();
            }
        }