Andrew Vos's Blog

using System.Drawing.Drawing2D;
using System.Collections.Generic;

namespace System.Drawing.Drawing2D {
  public class Web2GradientBrushes {
    private Rectangle rectangle;
    private RectangleF rectangleF;
    private List<LinearGradientBrush> usedBrushes;

    public Web2GradientBrushes(Rectangle rectangle) {
      this.rectangle = rectangle;
    }
    public Web2GradientBrushes(RectangleF rectangleF) {
      this.rectangleF = rectangleF;
    }

    public LinearGradientBrush Black {
      get {
        return this.getBrush(Color.FromArgb(69, 68, 68), Color.Black);
      }
    }
    public LinearGradientBrush Yellow {
      get {
        return this.getBrush(Color.FromArgb(249, 234, 148), Color.FromArgb(249, 218, 45));
      }
    }
    public LinearGradientBrush Blue {
      get {
        return this.getBrush(Color.FromArgb(119, 183, 227), Color.FromArgb(50, 112, 237));
      }
    }


    public void DisposeUsedBrushes() {
      if (this.usedBrushes != null) {
        foreach (LinearGradientBrush brush in this.usedBrushes) {
          try {
            brush.Dispose();
          }
          catch { }
        }
        this.usedBrushes.Clear();
      }
    }

    private LinearGradientBrush getBrush(Color color1, Color color2) {
      LinearGradientBrush lgb = null;

      if (!this.rectangle.IsEmpty) {
        lgb = new LinearGradientBrush(this.rectangle, color1, color2, LinearGradientMode.Vertical);
      }
      else if (!this.rectangleF.IsEmpty) {
        lgb = new LinearGradientBrush(this.rectangleF, color1, color2, LinearGradientMode.Vertical);
      }

      if (lgb != null) {
        if (this.usedBrushes == null) { this.usedBrushes = new List<LinearGradientBrush>(); }
        this.usedBrushes.Add(lgb);
      }
      return lgb;
    }
  }
}