1 | #region License Information |
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2 | |
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3 | /* HeuristicLab |
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4 | * Copyright (C) 2002-2016 Heuristic and Evolutionary Algorithms Laboratory (HEAL) |
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5 | * |
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6 | * This file is part of HeuristicLab. |
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7 | * |
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8 | * HeuristicLab is free software: you can redistribute it and/or modify |
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9 | * it under the terms of the GNU General Public License as published by |
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10 | * the Free Software Foundation, either version 3 of the License, or |
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11 | * (at your option) any later version. |
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12 | * |
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13 | * HeuristicLab is distributed in the hope that it will be useful, |
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 | * GNU General Public License for more details. |
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17 | * |
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18 | * You should have received a copy of the GNU General Public License |
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19 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>. |
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20 | */ |
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21 | |
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22 | #endregion |
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23 | |
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24 | using System; |
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25 | |
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26 | namespace HeuristicLab.Visualization.ChartControlsExtensions { |
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27 | public static class ChartUtil { |
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28 | public static void CalculateAxisInterval(double min, double max, int ticks, out double axisMin, out double axisMax, out double axisInterval) { |
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29 | var dmin = (max - min).Decimals(); |
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30 | axisMin = min.Floor(dmin); |
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31 | var range = max - axisMin; |
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32 | var slice = range / ticks; |
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33 | var dslice = slice.Decimals(); |
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34 | var floor = slice.Floor(dslice); |
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35 | var ceil = slice.Ceil(dslice); |
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36 | var axisRange = floor * ticks; |
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37 | axisInterval = floor; |
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38 | if (axisRange < max - axisMin) { |
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39 | axisRange = ceil * ticks; |
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40 | axisInterval = ceil; |
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41 | } |
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42 | axisMax = axisMin + axisRange; |
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43 | } |
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44 | |
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45 | private static int Decimals(this double x) { |
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46 | if (x.IsAlmost(0) || double.IsInfinity(x) || double.IsNaN(x)) |
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47 | return 0; |
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48 | |
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49 | var v = Math.Abs(x); |
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50 | int d = 0; |
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51 | while (v < 1) { |
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52 | v *= 10; |
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53 | d++; |
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54 | } |
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55 | return d; |
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56 | } |
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57 | |
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58 | // rounds down to the nearest value according to the given number of decimal precision |
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59 | private static double Floor(this double value, int precision) { |
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60 | var n = Math.Pow(10, precision); |
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61 | return Math.Round(Math.Floor(value * n) / n, precision); |
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62 | } |
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63 | |
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64 | private static double Ceil(this double value, int precision) { |
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65 | var n = Math.Pow(10, precision); |
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66 | return Math.Round(Math.Ceiling(value * n) / n, precision); |
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67 | } |
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68 | |
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69 | private static double Round(this double value, int precision) { |
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70 | var n = Math.Pow(10, precision); |
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71 | return Math.Round(Math.Round(value * n) / n, precision); |
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72 | } |
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73 | |
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74 | private static bool IsAlmost(this double value, double other, double eps = 1e-12) { |
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75 | return Math.Abs(value - other) < eps; |
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76 | } |
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77 | } |
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78 | } |
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