WLC_Programming Knowledge

 
private void btnDrawCoordinate_Click(object sender, EventArgs e)
{
    //Create Graphics Object
    Graphics gr = pnPlotArea.CreateGraphics();

    //Get Graphics's Quality
    gr.SmoothingMode = SmoothingMode.HighQuality;

    //Change StartPoint Point(0,0)
    gr.TranslateTransform(pnPlotArea.Width / 2, pnPlotArea.Height / 2);

    //Refresh Background Color of Graphics
    gr.Clear(Color.LightGray);

    //Create Pen Object Specified Color and Width
    using (Pen p = new Pen(Color.Black, 5))
    {
        //Create X and Y axes               
        gr.DrawLine(p, -pnPlotArea.Width / 2, 0, pnPlotArea.Width / 2, 0);
        gr.DrawLine(p, 0, -pnPlotArea.Height / 2, 0, pnPlotArea.Height / 2);

        //Create Font Object Specified FontFamily,Size,Style
        using (Font f = new Font("Courier New", 18, FontStyle.Bold))
        {
            //Create Axes's Label
            gr.DrawString("X", f, Brushes.Blue, pnPlotArea.Width / 2 - 20, -30);
            gr.DrawString("Y", f, Brushes.Blue, -25, -pnPlotArea.Height / 2 + 5);
        }
    }

    //Draw Ticks
    int tick = 50;
    for (int i = -300; i <= 300; i += tick)
    {
        using (Pen p = new Pen(Color.Black, 3))
        {
            if (i != 0)
            {
                //For X-axes's Line
                gr.DrawLine(p, i, 0, i, 10);

                //For Y-axes's Line
                gr.DrawLine(p, 0, i, 10, i);

                //For X-axes's Text
                gr.DrawString(i.ToString(), this.Font, Brushes.Green, i + 5, 5);

                //For Y-axes's Text
                gr.DrawString(i.ToString(), this.Font, Brushes.Green, 5, i + 5);
            }
            else
            {
                //For Point(0,0)
                gr.DrawString("0", this.Font, Brushes.Green, i + 5, 5);
            }
        }
    }
}

 
private void btnDrawStar_Click(object sender, EventArgs e)
{
    //Create Graphics Object
    Graphics gr = pnPlotArea.CreateGraphics();

    //Get Graphics's Quality
    gr.SmoothingMode = SmoothingMode.HighQuality;

    //Change StartPoint Point(0,0)
    gr.TranslateTransform(pnPlotArea.Width / 2, pnPlotArea.Height / 2);

    //Create Pen Object
    Pen p = new Pen(Color.Green, 5);

    //Create Custom Point
    Point[] point = { 
                      new Point(0, -200),
                      new Point(50, -50),
                      new Point(200, -50),
                      new Point(100, 50),
                      new Point(150, 200),
                      new Point(0, 100),
                      new Point(-150, 200),
                      new Point(-100, 50),
                      new Point(-200, -50),
                      new Point(-50, -50),
                      new Point(0, -200)
                  };

    //Drawing Star
    gr.DrawLines(p, point);
}