source: branches/HeuristicLab.Problems.GrammaticalOptimization/DynamicDataDisplay/Charts/Axes/DateTime/MinorTimeProviderBase.cs @ 13847

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Research.DynamicDataDisplay.Common.Auxiliary;

namespace Microsoft.Research.DynamicDataDisplay.Charts
{
  internal abstract class MinorTimeProviderBase<T> : ITicksProvider<T>
  {
    public event EventHandler Changed;
    protected void RaiseChanged()
    {
      if (Changed != null)
      {
        Changed(this, EventArgs.Empty);
      }
    }

    private readonly ITicksProvider<T> provider;
    public MinorTimeProviderBase(ITicksProvider<T> provider)
    {
      this.provider = provider;
    }

    private T[] majorTicks = new T[] { };
    internal void SetTicks(T[] ticks)
    {
      this.majorTicks = ticks;
    }

    private double ticksSize = 0.5;
    public ITicksInfo<T> GetTicks(Range<T> range, int ticksCount)
    {
      if (majorTicks.Length == 0)
        return new TicksInfo<T>();

      ticksCount /= majorTicks.Length;
      if (ticksCount == 0)
        ticksCount = 2;

      var ticks = majorTicks.GetPairs().Select(r => Clip(provider.GetTicks(r, ticksCount), r)).
        SelectMany(t => t.Ticks).ToArray();

      var res = new TicksInfo<T>
      {
        Ticks = ticks,
        TickSizes = ArrayExtensions.CreateArray(ticks.Length, ticksSize)
      };
      return res;
    }

    private ITicksInfo<T> Clip(ITicksInfo<T> ticks, Range<T> range)
    {
      var newTicks = new List<T>(ticks.Ticks.Length);
      var newSizes = new List<double>(ticks.TickSizes.Length);

      for (int i = 0; i < ticks.Ticks.Length; i++)
      {
        T tick = ticks.Ticks[i];
        if (IsInside(tick, range))
        {
          newTicks.Add(tick);
          newSizes.Add(ticks.TickSizes[i]);
        }
      }

      return new TicksInfo<T>
      {
        Ticks = newTicks.ToArray(),
        TickSizes = newSizes.ToArray(),
        Info = ticks.Info
      };
    }

    protected abstract bool IsInside(T value, Range<T> range);

    public int DecreaseTickCount(int ticksCount)
    {
      if (majorTicks.Length > 0)
        ticksCount /= majorTicks.Length;

      int minorTicksCount = provider.DecreaseTickCount(ticksCount);

      if (majorTicks.Length > 0)
        minorTicksCount *= majorTicks.Length;

      return minorTicksCount;
    }

    public int IncreaseTickCount(int ticksCount)
    {
      if (majorTicks.Length > 0)
        ticksCount /= majorTicks.Length;

      int minorTicksCount = provider.IncreaseTickCount(ticksCount);

      if (majorTicks.Length > 0)
        minorTicksCount *= majorTicks.Length;

      return minorTicksCount;
    }

    public ITicksProvider<T> MinorProvider
    {
      get { return null; }
    }

    public ITicksProvider<T> MajorProvider
    {
      get { return null; }
    }
  }
}