Csharp/C Sharp/2D Graphics/LinearGradientBrush

Enumerate LinearGradientMode

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

   public MainForm() {
       CenterToScreen();
   }
   protected void OnPaint(PaintEventArgs e) {
       Graphics g = e.Graphics;
       Rectangle r = new Rectangle(10, 10, 100, 100);
       LinearGradientBrush theBrush = null;
       int yOffSet = 10;
       Array obj = Enum.GetValues(typeof(LinearGradientMode));
       for (int x = 0; x < obj.Length; x++) {
           LinearGradientMode temp = (LinearGradientMode)obj.GetValue(x);
           theBrush = new LinearGradientBrush(r, Color.GreenYellow,
                                              Color.Blue, temp);
           g.DrawString(temp.ToString(), new Font("Times New Roman", 10),
                        new SolidBrush(Color.Black), 0, yOffSet);
           g.FillRectangle(theBrush, 150, yOffSet, 200, 50);
           yOffSet += 80;
       }
   }

}

</source>

LinearGradientMode.Horizontal, Vertical, BackwardDiagonal, ForwardDiagonal

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

   [STAThread]
   static void Main() {
       Application.Run(new Form1());
   }
   protected override void OnPaint(PaintEventArgs e) {
       Graphics g = e.Graphics;
       Font f = new Font(new FontFamily("Times New Roman"), 10);
       Brush fb = new SolidBrush(Color.Black);
       LinearGradientBrush lGB;  
       Color cR = Color.Red, cW = Color.White;
       int w = 100, h = 70;
       g.DrawString("Horizontal", f, fb, 10, 5);
       Rectangle rec = new Rectangle(10, 20, w, h);
       LinearGradientMode lGM = LinearGradientMode.Horizontal;
       lGB = new LinearGradientBrush(rec, cR, cW, lGM);
       g.FillRectangle(lGB, rec);
       g.DrawString("Vertical", f, fb, w + 20, 5);
       rec.Offset(w + 10, 0);
       lGM = LinearGradientMode.Vertical;
       lGB = new LinearGradientBrush(rec, cR, cW, lGM);
       g.FillRectangle(lGB, rec);
       g.DrawString("ForwardDiagonal", f, fb, 10, h + 25);
       rec.Offset(-w - 10, h + 20);
       lGM = LinearGradientMode.ForwardDiagonal;
       lGB = new LinearGradientBrush(rec, cR, cW, lGM);
       g.FillRectangle(lGB, rec);
       g.DrawString("BackwardDiagonal", f, fb, w + 20, h + 25);
       rec.Offset(w + 10, 0);
       lGM = LinearGradientMode.BackwardDiagonal;
       lGB = new LinearGradientBrush(rec, cR, cW, lGM);
       g.FillRectangle(lGB, rec);
       fb.Dispose();
       g.Dispose();
   }

}

</source>

Rectangle Linear-Gradient Brush

<source lang="csharp">

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

class RectangleLinearGradientBrush: Form {

    MenuItem miChecked;
  
    public static void Main()
    {
         Application.Run(new RectangleLinearGradientBrush());
    } 
    public RectangleLinearGradientBrush()
    {
         ResizeRedraw = true; 
  
         Menu = new MainMenu();
         Menu.MenuItems.Add("&Gradient-Mode");
  
         foreach (LinearGradientMode gm in 
                             Enum.GetValues(typeof(LinearGradientMode)))
         {
              MenuItem mi = new MenuItem();
              mi.Text     = gm.ToString(); 
              mi.Click   += new EventHandler(MenuGradientModeOnClick);
              Menu.MenuItems[0].MenuItems.Add(mi);
         }
         miChecked = Menu.MenuItems[0].MenuItems[0];
         miChecked.Checked = true;
    }
    void MenuGradientModeOnClick(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)
    {
         Rectangle rectBrush = 
                        new Rectangle(cx / 4, cy / 4, cx / 2, cy / 2);
  
         LinearGradientBrush lgbrush = 
              new LinearGradientBrush(
                        rectBrush, Color.White, Color.Black,
                        (LinearGradientMode) miChecked.Index);
  
        grfx.FillRectangle(lgbrush, 0, 0, cx, cy);
        grfx.DrawRectangle(Pens.Black, rectBrush);
    }

}

</source>

Two-Point Linear Gradient Brush

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

class TwoPointLinearGradientBrush: Form {

    public static void Main()
    {
         Application.Run(new TwoPointLinearGradientBrush());
    }
    TwoPointLinearGradientBrush()
    {
         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)
    {
         LinearGradientBrush lgbrush = 
              new LinearGradientBrush(
                        new Point(cx / 4, cy / 4), 
                        new Point(3 * cx / 4, 3 * cy / 4),
                        Color.White, Color.Black);
  
         grfx.FillRectangle(lgbrush, 0, 0, cx, cy);
    }

}

</source>