Csharp/CSharp Tutorial/2D/Gradient Brush

Fill a rectangle Linear Gradient Brush

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class BrushLinearGradient : System.Windows.Forms.Form
{
  public BrushLinearGradient()
  {
    this.BackColor = System.Drawing.Color.White;
    this.ClientSize = new System.Drawing.Size(400, 400);
    this.Paint += new System.Windows.Forms.PaintEventHandler(this.BrushLinearGradient_Paint);
  }
  static void Main() 
  {
    Application.Run(new BrushLinearGradient());
  }
  private void BrushLinearGradient_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
  {
    Graphics g = e.Graphics;
    Brush brGradient = new LinearGradientBrush(new Rectangle(0, 0, 200, 200), Color.Black, Color.LightGray, 45, false);
    g.FillRectangle(brGradient, 10, 10, 200, 200);
  }
}

Linear Gradient Brush

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class BrushLinearGradient : System.Windows.Forms.Form
{
  public BrushLinearGradient()
  {
    this.BackColor = System.Drawing.Color.White;
    this.ClientSize = new System.Drawing.Size(400, 400);
    this.Paint += new System.Windows.Forms.PaintEventHandler(this.BrushLinearGradient_Paint);
  }
  static void Main() 
  {
    Application.Run(new BrushLinearGradient());
  }
  private void BrushLinearGradient_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
  {
    Graphics g = e.Graphics;
    Brush brGradient = new LinearGradientBrush(new Rectangle(0, 0, 200, 200), Color.Black, Color.LightGray, 45, false);
    g.FillRectangle(brGradient, 10, 10, 200, 200);
  }
}

PathGradient.CenterPoint

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);
        GraphicsPath gp;
        PathGradientBrush pGB; 
        Rectangle rec;
        Color cR = Color.Red, cW = Color.White, cY = Color.Yellow;
        int w = 100, h = 70;
        g.DrawString("Center", f, fb, 10, 5);
        gp = new GraphicsPath();
        rec = new Rectangle(10, 20, w, h);
        gp.AddRectangle(rec);
        pGB = new PathGradientBrush(gp);
        pGB.CenterPoint = new Point(10 + w / 2, 20 + h / 2);
        pGB.CenterColor = cR;
        pGB.SurroundColors = new Color[1] { cW };
        g.FillRectangle(pGB, rec);
        g.DrawString("Center - 2 x 2 Colors", f, fb, w + 20, 5);
        gp = new GraphicsPath();
        rec = new Rectangle(20 + w, 20, w, h);
        gp.AddRectangle(rec);
        pGB = new PathGradientBrush(gp);
        pGB.CenterPoint = new Point(w + 20 + w / 2, 20 + h / 2);
        pGB.CenterColor = cR;
        pGB.SurroundColors = new Color[4] { cW, cY, cW, cY };
        g.FillRectangle(pGB, rec);
        g.DrawString("LefTopCenter", f, fb, 10, h + 25);
        gp = new GraphicsPath();
        rec = new Rectangle(10, h + 40, w, h);
        gp.AddRectangle(rec);
        pGB = new PathGradientBrush(gp);
        pGB.CenterPoint = new Point(10, h + 40);
        pGB.CenterColor = cR;
        pGB.SurroundColors = new Color[1] { cW };
        g.FillRectangle(pGB, rec);
        g.DrawString("Top", f, fb, w + 20, h + 25);
        gp = new GraphicsPath();
        rec = new Rectangle(w + 20, h + 40, w, h);
        gp.AddEllipse(rec);
        pGB = new PathGradientBrush(gp);
        pGB.CenterPoint = new Point(w + 20 + w / 2, h + 40);
        pGB.CenterColor = cR;
        pGB.SurroundColors = new Color[1] { cW };
        g.FillRectangle(pGB, rec);
        g.Dispose();
        fb.Dispose();
    }
}