source: branches/HeuristicLab.Drawing/HeuristicLab.Drawing/3.3/Primitives/Ellipse.cs @ 4773

Last change on this file since 4773 was 4773, checked in by abeham, 8 years ago

#1265

  • Created branch for HeuristicLab.Drawing
  • Updated license headers, namespaces and versions
File size: 3.0 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2010 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System;
23using System.Collections.Generic;
24using System.Text;
25using System.Drawing;
26
27namespace HeuristicLab.Drawing {
28  public class Ellipse : RectangularPrimitiveBase {
29    public Ellipse(IChart chart, PointD lowerLeft, PointD upperRight)
30      : base(chart, lowerLeft, upperRight) {
31    }
32    public Ellipse(IChart chart, double x1, double y1, double x2, double y2)
33      : this(chart, new PointD(x1, y1), new PointD(x2, y2)) {
34    }
35    public Ellipse(IChart chart, PointD lowerLeft, PointD upperRight, Pen pen, Brush brush)
36      : base(chart, lowerLeft, upperRight, pen, brush) {
37    }
38    public Ellipse(IChart chart, double x1, double y1, double x2, double y2, Pen pen, Brush brush)
39      : this(chart, new PointD(x1, y1), new PointD(x2, y2), pen, brush) {
40    }
41
42    public override bool ContainsPoint(PointD point) {
43      if (base.ContainsPoint(point)) return true;
44
45      PointD midpoint;
46      PointD focus1;
47      PointD focus2;
48      Offset focus1_point;
49      Offset focus2_point;
50
51      double a = Size.Width / 2;   // half length of horizontal axis
52      double b = Size.Height / 2;  // half length of vertical axis
53      midpoint = LowerLeft + new Offset(a, b);
54
55      if (a >= b) {
56        double e = Math.Sqrt(a * a - b * b);  // linear eccentricity
57        focus1 = new PointD(midpoint.X - e, midpoint.Y);
58        focus2 = new PointD(midpoint.X + e, midpoint.Y);
59      } else {
60        double e = Math.Sqrt(b * b - a * a);  // linear eccentricity
61        focus1 = new PointD(midpoint.X, midpoint.Y - e);
62        focus2 = new PointD(midpoint.X, midpoint.Y + e);
63      }
64      focus1_point = focus1 - point;
65      focus2_point = focus2 - point;
66
67      return focus1_point.Length + focus2_point.Length <= 2 * Math.Max(a, b);
68    }
69
70    public override void Draw(Graphics graphics) {
71      Point p = Chart.TransformWorldToPixel(new PointD(LowerLeft.X, LowerLeft.Y + Size.Height));
72      Size s = Chart.TransformWorldToPixel(Size);
73      if (Brush != null)
74        graphics.FillEllipse(Brush, p.X, p.Y, s.Width, s.Height);
75      graphics.DrawEllipse(Pen, p.X, p.Y, s.Width, s.Height);
76      base.Draw(graphics);
77    }
78  }
79}
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