Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/utils/DoubleUtil.java @ 2089:0da8874bd378

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Added initial state to map artifact to be able to advance and step back. The map artifact overrides describe() to have the complete UI information in the describe response document. flys-artifacts/trunk@3613 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Raimund Renkert <raimund.renkert@intevation.de>
date Fri, 06 Jan 2012 12:02:10 +0000
parents 0b6dac664bbb
children 0dd58ab7e118
rev   line source
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1 package de.intevation.flys.utils;
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2
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3 import java.util.Arrays;
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5 import de.intevation.flys.artifacts.math.Linear;
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6
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7
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8 public class DoubleUtil
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9 {
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10 public static final double DEFAULT_STEP_PRECISION = 1e6;
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11
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12 private DoubleUtil() {
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13 }
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14
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15 public static final double [] explode(double from, double to, double step) {
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16 return explode(from, to, step, DEFAULT_STEP_PRECISION);
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17 }
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18
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19 public static final double round(double x, double precision) {
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20 return Math.round(x * precision)/precision;
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21 }
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22
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23 public static final double round(double x) {
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24 return Math.round(x * DEFAULT_STEP_PRECISION)/DEFAULT_STEP_PRECISION;
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25 }
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26
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27 public static final double [] explode(
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28 double from,
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29 double to,
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30 double step,
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31 double precision
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32 ) {
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33 double lower = from;
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34
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35 double diff = to - from;
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36 double tmp = diff / step;
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37 int num = (int)Math.abs(Math.ceil(tmp)) + 1;
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38
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39 double [] values = new double[num];
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40
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41 if (from > to) {
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42 step = -step;
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43 }
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44
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45 double max = Math.max(from, to);
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46
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47 for (int idx = 0; idx < num; idx++) {
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48 if (lower > max) {
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49 return Arrays.copyOfRange(values, 0, idx);
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50 }
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51
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52 values[idx] = round(lower, precision);
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53 lower += step;
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54 }
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55
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56 return values;
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57 }
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58
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59 public static final double interpolateSorted(
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60 double [] xs,
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61 double [] ys,
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62 double x
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63 ) {
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64 int lo = 0, hi = xs.length-1;
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65
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66 int mid = -1;
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67
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68 while (lo <= hi) {
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69 mid = (lo + hi) >> 1;
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70 double mx = xs[mid];
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71 if (x < mx) hi = mid - 1;
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72 else if (x > mx) lo = mid + 1;
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73 else return ys[mid];
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74 }
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75 if (mid < lo) {
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76 return lo >= xs.length
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77 ? Double.NaN
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78 : Linear.linear(x, xs[mid], xs[mid+1], ys[mid], ys[mid+1]);
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79 }
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80 return hi < 0
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81 ? Double.NaN
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82 : Linear.linear(x, xs[mid-1], xs[mid], ys[mid-1], ys[mid]);
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83 }
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84
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85 public static final boolean isIncreasing(double [] array) {
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86 int inc = 0;
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87 int dec = 0;
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88 int sweet = (array.length-1)/2;
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89 for (int i = 1; i < array.length; ++i) {
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90 if (array[i] > array[i-1]) {
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91 if (++inc > sweet) {
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92 return true;
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93 }
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94 }
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95 else if (++dec > sweet) {
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96 return false;
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97 }
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98 }
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99 return inc > sweet;
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100 }
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101
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102 public static final double [] swap(double [] array) {
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103 int lo = 0;
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104 int hi = array.length-1;
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105 while (hi > lo) {
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106 double t = array[lo];
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107 array[lo] = array[hi];
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108 array[hi] = t;
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109 ++lo;
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110 --hi;
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111 }
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112
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113 return array;
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114 }
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115
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116 public static final double [] swapClone(double [] in) {
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117 double [] out = new double[in.length];
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118
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119 for (int j = out.length-1, i = 0; j >= 0;) {
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120 out[j--] = in[i++];
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121 }
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122
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123 return out;
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124 }
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125
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126 public static final double [] sumDiffs(double [] in) {
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127 double [] out = new double[in.length];
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128
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129 for (int i = 1; i < out.length; ++i) {
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130 out[i] = out[i-1] + Math.abs(in[i-1] - in[i]);
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131 }
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132
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133 return out;
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134 }
655
913b52064449 Refactored version of "Berechnung 4"
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135 }
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136 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org