Csharp/C Sharp/2D Graphics/PathGradientBrush

CenterColor

<source lang="csharp"> using System; using System.Collections.Generic; using System.ruponentModel; using System.Data; using System.Drawing; using System.Drawing.Drawing2D; using System.Text; using System.Windows.Forms; public class Form1 : Form {

   protected override void OnPaint(PaintEventArgs e) {
       Graphics g = e.Graphics;
       GraphicsPath gp = new GraphicsPath();
       gp.AddLine(10, 10, 110, 15);
       gp.AddLine(110, 15, 100, 96);
       gp.AddLine(100, 96, 15, 110);
       gp.CloseFigure();
       g.FillRectangle(Brushes.White, this.ClientRectangle);
       g.SmoothingMode = SmoothingMode.AntiAlias;
       PathGradientBrush pgb = new PathGradientBrush(gp);
       pgb.CenterColor = Color.White;
       pgb.SurroundColors = new Color[] { Color.Blue };
       g.FillPath(pgb, gp);
       g.DrawPath(Pens.Black, gp);
       pgb.Dispose();
       gp.Dispose();
   }
   public static void Main() {
       Application.Run(new Form1());
   }

}

</source>

Gradient Brush Ball

<source lang="csharp"> using System; using System.Drawing; using System.Drawing.Drawing2D; using System.Windows.Forms; class BouncingGradientBrushBall : Form {

   public static void Main() {
       Application.Run(new BouncingGradientBrushBall());
   }
   public BouncingGradientBrushBall() {
       ResizeRedraw = true;
   }
   protected override void OnPaint(PaintEventArgs pea) {
       GraphicsPath path = new GraphicsPath();
       Rectangle rect = new Rectangle(10, 10, 30, 30);
       path.AddEllipse(rect);
       PathGradientBrush pgbrush = new PathGradientBrush(path);
       pgbrush.CenterPoint = new PointF((rect.Left + rect.Right) / 3,
                                        (rect.Top + rect.Bottom) / 3);
       pgbrush.CenterColor = Color.White;
       pgbrush.SurroundColors = new Color[] { Color.Red };
       pea.Graphics.FillRectangle(pgbrush, rect);
   }

}

</source>

Square Tile

<source lang="csharp"> using System; using System.Drawing; using System.Drawing.Drawing2D; using System.Windows.Forms;

class SquareTile: Form {

    const int iSide = 50;         // Side of square
  
    public static void Main()
    {
         Application.Run(new SquareTile());
    }
    public SquareTile()
    {
         ResizeRedraw = true; 
    }
    protected override void OnPaint(PaintEventArgs pea)
    {
         DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
    }      
    protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
    {
         Point[] apt = {new Point(0,     0),     new Point(iSide, 0), 
                        new Point(iSide, iSide), new Point(0,     iSide)};
  
         PathGradientBrush pgbrush =
                        new PathGradientBrush(apt, WrapMode.TileFlipXY);
  
         pgbrush.SurroundColors = new Color[] { Color.Red,  Color.Lime,
                                                Color.Blue, Color.White};
  
         grfx.FillRectangle(pgbrush, 0, 0, cx, cy);
    }

}

</source>

Star Gradient Brush

<source lang="csharp"> using System; using System.Drawing; using System.Drawing.Drawing2D; using System.Windows.Forms;

class StarGradientBrush: Form {

    public static void Main()
    {
         Application.Run(new StarGradientBrush());
    }
    public StarGradientBrush()
    {
         ResizeRedraw = true; 
    }
    protected override void OnPaint(PaintEventArgs pea)
    {
         DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
    }       
    protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
    {
         Point[] apt = new Point[5];
         
         for (int i = 0; i < apt.Length; i++)
         {
              double dAngle = (i * 0.8 - 0.5) * Math.PI;
              apt[i] = new Point(
                        (int)(cx * (0.50 + 0.48 * Math.Cos(dAngle))),
                        (int)(cy * (0.50 + 0.48 * Math.Sin(dAngle))));
         }
         PathGradientBrush pgbrush = new PathGradientBrush(apt);
  
         pgbrush.CenterColor = Color.White;
         pgbrush.SurroundColors = new Color[1] { Color.Black };
  
         grfx.FillRectangle(pgbrush, 0, 0, cx, cy);
   }

}

</source>

Triangle Gradient Brush

<source lang="csharp">

using System; using System.Drawing; using System.Drawing.Drawing2D; using System.Windows.Forms;

class TriangleGradientBrush: Form {

    public static void Main()
    {
         Application.Run(new TriangleGradientBrush());
    }
    public TriangleGradientBrush()
    {
         ResizeRedraw = true;
    }
    protected override void OnPaint(PaintEventArgs pea)
    {
         DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
    }       
    protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
    {
         Point[] apt  = { new Point(cx,  0),
                          new Point(cx, cy),
                          new Point(0,  cy) };
  
         PathGradientBrush pgbrush = new PathGradientBrush(apt);
  
         grfx.FillRectangle(pgbrush, 0, 0, cx, cy);
    }

}

</source>

Triangle Tile

<source lang="csharp"> using System; using System.Drawing; using System.Drawing.Drawing2D; using System.Windows.Forms;

class TriangleTile: Form {

    const int iSide = 50;         // Side of square for triangle
    MenuItem  miChecked;
  
    public static void Main()
    {
         Application.Run(new TriangleTile());
    }
    public TriangleTile()
    {
         ResizeRedraw = true; 
  
         Menu = new MainMenu();
         Menu.MenuItems.Add("&Wrap-Mode");
  
         foreach (WrapMode wm in Enum.GetValues(typeof(WrapMode)))
         {
              MenuItem mi = new MenuItem();
              mi.Text     = wm.ToString(); 
              mi.Click   += new EventHandler(MenuWrapModeOnClick);
              Menu.MenuItems[0].MenuItems.Add(mi);
         }
         miChecked = Menu.MenuItems[0].MenuItems[0];
         miChecked.Checked = true;
    }
    void MenuWrapModeOnClick(object obj, EventArgs ea)
    {
         miChecked.Checked = false;
         miChecked = (MenuItem) obj;
         miChecked.Checked = true;
         Invalidate();
    }
    protected override void OnPaint(PaintEventArgs pea)
    {
         DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
    }        
    protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
    {
         Point[] apt = { new Point(0,     0), 
                         new Point(iSide, 0), 
                         new Point(0,     iSide)};
  
         PathGradientBrush pgbrush = 
                   new PathGradientBrush(apt, (WrapMode) miChecked.Index);
  
         grfx.FillRectangle(pgbrush, 0, 0, cx, cy);
    }

}

</source>

Two-Triangle Tile

<source lang="csharp"> using System; using System.Drawing; using System.Drawing.Drawing2D; using System.Windows.Forms; class TwoTriangleTile : Form {

   const int iSide = 50;         // Side of square for triangle
   public static void Main() {
       Application.Run(new TwoTriangleTile());
   }
   public TwoTriangleTile() {
       ResizeRedraw = true;
   }
   protected override void OnPaint(PaintEventArgs pea) {
       DoPage(pea.Graphics, ForeColor, ClientSize.Width, ClientSize.Height);
   }
   protected void DoPage(Graphics grfx, Color clr, int cx, int cy) {
       Point[] apt = { new Point(0, 0), new Point(iSide, 0), new Point(0, iSide) };
       PathGradientBrush pgbrush1 =
                      new PathGradientBrush(apt, WrapMode.TileFlipXY);
       apt = new Point[] {new Point(iSide, 0), new Point(iSide, iSide), 
                            new Point(0, iSide)};
       PathGradientBrush pgbrush2 =
                      new PathGradientBrush(apt, WrapMode.TileFlipXY);
       grfx.FillRectangle(pgbrush1, 0, 0, cx, cy);
       grfx.FillRectangle(pgbrush2, 0, 0, cx, cy);
   }

}

</source>