#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2010 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
 *
 * This file is part of HeuristicLab.
 *
 * HeuristicLab is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * HeuristicLab is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
 */
#endregion

using System;
using System.Collections.Generic;
using System.Drawing;
using HeuristicLab.Visualization;

namespace HeuristicLab.EvolutionaryTracking.Views {
  public class VisualGenealogyGraphNode : Ellipse {
    public SymbolicExpressionTreeGenealogyGraphNode Data { get; internal set; }
    private List<VisualGenealogyGraphArc> incomingArcs = new List<VisualGenealogyGraphArc>();
    private List<VisualGenealogyGraphArc> outgoingArcs = new List<VisualGenealogyGraphArc>();

    public List<VisualGenealogyGraphArc> IncomingArcs {
      get { return incomingArcs; }
      set { incomingArcs = value; }
    }
    public List<VisualGenealogyGraphArc> OutgoingArcs {
      get { return outgoingArcs; }
      set { outgoingArcs = value; }
    }

    public float LineWidth {
      get { return Pen.Width; }
      set { Pen.Width = value; }
    }

    public VisualGenealogyGraphNode(IChart chart, PointD lowerLeft, PointD upperRight)
      : base(chart, lowerLeft, upperRight) {
    }
    public VisualGenealogyGraphNode(IChart chart, double x1, double y1, double x2, double y2)
      : this(chart, new PointD(x1, y1), new PointD(x2, y2)) {
    }
    public VisualGenealogyGraphNode(IChart chart, PointD lowerLeft, PointD upperRight, Pen pen, Brush brush)
      : base(chart, lowerLeft, upperRight, pen, brush) {
    }
    public VisualGenealogyGraphNode(IChart chart, double x1, double y1, double x2, double y2, Pen pen, Brush brush)
      : this(chart, new PointD(x1, y1), new PointD(x2, y2), pen, brush) {
    }

    // compute the intersection point of an ellipse and a line passing through its center with the angular coordinate theta
    public PointD CalculateIntersection(double theta) {
      double sin = Math.Sin(theta);
      double cos = Math.Cos(theta);
      double a = Size.Width / 2;
      double b = Size.Height / 2;
      double r = a * b / Math.Sqrt(Math.Pow(a * sin, 2) + Math.Pow(b * cos, 2)); // radius at intersection point
      double rx = r * cos; // X-component (relative to the origin/center of the ellipse)
      double ry = r * sin; // Y-component (relative to the origin/center of the ellipse)
      return new PointD(rx, ry);
    }

    public override void SetPosition(PointD lowLeft, PointD upRight) {
      base.SetPosition(lowLeft, upRight);
      foreach (var a in IncomingArcs) a.UpdatePosition();
      foreach (var a in OutgoingArcs) a.UpdatePosition();
    }

    public PointD Center {
      get { return new PointD((LowerLeft.X + UpperRight.X) / 2, (LowerLeft.Y + UpperRight.Y) / 2); }
    }

    public override void Draw(Graphics graphics) {
      Point p = Chart.TransformWorldToPixel(new PointD(LowerLeft.X, LowerLeft.Y + Size.Height));
      Size s = Chart.TransformWorldToPixel(Size);
      if (Brush != null)
        graphics.FillEllipse(Brush, p.X, p.Y, s.Width, s.Height);
      graphics.DrawEllipse(Pen, p.X, p.Y, s.Width, s.Height);
      if (Data.IsElite) {
        graphics.DrawEllipse(Pen, p.X + 2, p.Y + 2, s.Width - 4, s.Height - 4);
      }
    }
  }
}