#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2016 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.Drawing;
using System.Drawing.Text;

namespace HeuristicLab.Visualization {
  public sealed class LabeledPrimitive : RectangularPrimitiveBase {
    public string Label { get; set; }
    public Font Font { get; set; }
    public RectangularPrimitiveBase Primitive { get; private set; }
    public Brush TextBrush { get; set; }

    public LabeledPrimitive(RectangularPrimitiveBase primitive, string label, Font font, Brush textBrush = null) : base(primitive.Chart, primitive.LowerLeft, primitive.UpperRight, primitive.Pen, primitive.Brush) {
      Label = label;
      Primitive = primitive;
      Font = font;
      TextBrush = textBrush;
    }

    public override void Draw(Graphics graphics) {
      base.Draw(graphics);
      Primitive.Draw(graphics);
    }

    public override bool ContainsPoint(PointD point) {
      return Primitive.ContainsPoint(point);
    }

    public override void PostDraw(Graphics graphics) {
      base.PostDraw(graphics);
      graphics.TextRenderingHint = TextRenderingHint.AntiAlias;

      if (string.IsNullOrEmpty(Label))
        return;

      var labelSize = graphics.MeasureString(Label, Font);
      var primitiveSize = Chart.TransformWorldToPixel(new SizeD(Primitive.Size.Width, Primitive.Size.Height));

      float scale = Math.Min(primitiveSize.Width / labelSize.Width, primitiveSize.Height / labelSize.Height);

      Font = new Font(Font.FontFamily, Math.Min(12, Font.Size * scale));
      labelSize = graphics.MeasureString(Label, Font);

      var p1 = Chart.TransformWorldToPixel(LowerLeft);
      var p2 = Chart.TransformWorldToPixel(UpperRight);

      int width = Math.Abs(p1.X - p2.X);
      int height = Math.Abs(p1.Y - p2.Y);

      var brush = TextBrush ?? new SolidBrush(Primitive.Pen.Color);
      graphics.DrawString(Label, Font, brush, p1.X + (width - labelSize.Width) / 2f, p2.Y + (height - labelSize.Height) / 2f);
    }

    public override void Move(PointD point, Offset delta) {
      Primitive.Move(point, delta);
      base.Move(point, delta);
    }

    public override void Move(Offset delta) {
      Primitive.Move(delta);
      base.Move(delta);
    }
  }
}