Csharp/CSharp Tutorial/2D/Gradient Brush

Fill a rectangle Linear Gradient Brush

<source lang="csharp">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);
 }

}</source>

Linear Gradient Brush

<source lang="csharp">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);
 }

}</source>

PathGradient.CenterPoint

<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);
       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();
   }

}</source>