1 | ' Classes/System/Math.ab |
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2 | |
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3 | #ifndef __SYSTEM_MATH_AB__ |
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4 | #define __SYSTEM_MATH_AB__ |
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5 | |
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6 | Const _System_EPS5 = 0.001 |
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7 | |
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8 | Class Math |
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9 | Public |
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10 | Static Function E() As Double |
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11 | return 2.7182818284590452354 |
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12 | End Function |
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13 | |
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14 | Static Function PI() As Double |
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15 | return _System_PI |
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16 | End Function |
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17 | |
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18 | Static Function Abs(value As Double) As Double |
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19 | If value<0 then |
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20 | return -value |
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21 | Else |
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22 | return value |
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23 | End If |
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24 | End Function |
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25 | |
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26 | Static Function Abs(value As Single) As Single |
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27 | If value<0 then |
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28 | return -value |
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29 | Else |
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30 | return value |
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31 | End If |
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32 | End Function |
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33 | |
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34 | Static Function Abs(value As Char) As Char |
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35 | If value<0 then |
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36 | return -value |
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37 | Else |
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38 | return value |
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39 | End If |
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40 | End Function |
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41 | |
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42 | Static Function Abs(value As Integer) As Integer |
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43 | If value<0 then |
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44 | return -value |
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45 | Else |
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46 | return value |
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47 | End If |
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48 | End Function |
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49 | |
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50 | Static Function Abs(value As Long) As Long |
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51 | If value<0 then |
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52 | return -value |
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53 | Else |
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54 | return value |
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55 | End If |
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56 | End Function |
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57 | |
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58 | Static Function Abs(value As Int64) As Int64 |
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59 | If value<0 then |
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60 | return -value |
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61 | Else |
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62 | return value |
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63 | End If |
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64 | End Function |
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65 | |
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66 | Static Function Acos(x As Double) As Double |
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67 | If x < -1 Or x > 1 Then |
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68 | Acos = _System_GetNaN() |
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69 | Else |
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70 | Acos = _System_HalfPI - ASin(x) |
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71 | End If |
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72 | End Function |
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73 | |
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74 | Static Function Asin(x As Double) As Double |
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75 | If x < -1 Or x > 1 Then |
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76 | Asin = _System_GetNaN() |
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77 | Else |
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78 | Asin = ATan(x / Sqrt(1 - x * x)) |
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79 | End If |
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80 | End Function |
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81 | |
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82 | Static Function Atan(x As Double) As Double |
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83 | If IsNaN(x) Then |
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84 | Atan = x |
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85 | Exit Function |
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86 | ElseIf IsInf(x) Then |
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87 | Atan = CopySign(_System_PI, x) |
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88 | Exit Function |
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89 | End If |
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90 | Dim i As Long |
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91 | Dim sgn As Long |
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92 | Dim dbl = 0 As Double |
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93 | |
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94 | If x > 1 Then |
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95 | sgn = 1 |
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96 | x = 1 / x |
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97 | ElseIf x < -1 Then |
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98 | sgn = -1 |
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99 | x = 1 / x |
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100 | Else |
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101 | sgn = 0 |
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102 | End If |
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103 | |
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104 | For i = _System_Atan_N To 1 Step -1 |
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105 | Dim t As Double |
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106 | t = i * x |
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107 | dbl = (t * t) / (2 * i + 1 + dbl) |
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108 | Next |
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109 | |
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110 | If sgn > 0 Then |
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111 | Atan = _System_HalfPI - x / (1 + dbl) |
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112 | ElseIf sgn < 0 Then |
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113 | Atan = -_System_HalfPI - x / (1 + dbl) |
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114 | Else |
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115 | Atan = x / (1 + dbl) |
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116 | End If |
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117 | End Function |
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118 | |
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119 | Static Function Atan2(y As Double, x As Double) As Double |
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120 | If x = 0 Then |
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121 | Atan2 = Sgn(y) * _System_HalfPI |
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122 | Else |
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123 | Atan2 = Atn(y / x) |
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124 | If x < 0 Then |
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125 | Atan2 += CopySign(_System_PI, y) |
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126 | End If |
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127 | End If |
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128 | End Function |
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129 | |
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130 | Static Function BigMul(x As Long, y As Long) As Int64 |
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131 | Return (x As Int64) * y |
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132 | End Function |
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133 | |
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134 | Static Function Ceiling(x As Double) As Long |
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135 | If Floor(x) = x then |
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136 | Return x |
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137 | Else |
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138 | Return Floor(x) + 1 |
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139 | End If |
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140 | End Function |
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141 | |
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142 | Static Function Cos(x As Double) As Double |
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143 | If IsNaN(x) Then |
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144 | Return x |
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145 | ElseIf IsInf(x) Then |
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146 | Return _System_GetNaN() |
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147 | End If |
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148 | |
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149 | Return Math.Sin((_System_HalfPI - Abs(x)) As Double) |
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150 | End Function |
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151 | |
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152 | Static Function Cosh(value As Double) As Double |
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153 | Dim t As Double |
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154 | t = Exp(value) |
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155 | return (t + 1 / t) * 0.5 |
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156 | End Function |
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157 | |
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158 | Static Function DivRem(x As Long, y As Long, ByRef ret As Long) As Long |
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159 | ret = x Mod y |
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160 | return x \ y |
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161 | End Function |
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162 | |
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163 | Static Function DivRem(x As Int64, y As Int64, ByRef ret As Int64) As Int64 |
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164 | ret = x - (x \ y) * y |
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165 | return x \ y |
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166 | End Function |
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167 | |
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168 | 'Equals |
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169 | |
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170 | Static Function Exp(x As Double) As Double |
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171 | If IsNaN(x) Then |
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172 | Return x |
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173 | Else If IsInf(x) Then |
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174 | If 0 > x Then |
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175 | Return 0 |
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176 | Else |
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177 | Return x |
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178 | End If |
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179 | End If |
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180 | Dim i As Long, k As Long |
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181 | Dim x2 As Double, w As Double |
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182 | |
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183 | If x >= 0 Then |
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184 | k = Fix(x / _System_LOG2 + 0.5) |
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185 | Else |
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186 | k = Fix(x / _System_LOG2 - 0.5) |
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187 | End If |
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188 | |
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189 | x -= k * _System_LOG2 |
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190 | |
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191 | x2 = x * x |
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192 | w = x2 / 22 |
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193 | |
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194 | i = 18 |
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195 | While i >= 6 |
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196 | w = x2 / (w + i) |
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197 | i -= 4 |
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198 | Wend |
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199 | |
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200 | Return ldexp((2 + w + x) / (2 + w - x), k) |
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201 | End Function |
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202 | |
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203 | Static Function Floor(value As Double) As Long |
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204 | return Int(value) |
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205 | End Function |
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206 | |
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207 | 'GetHashCode |
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208 | |
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209 | 'GetType |
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210 | |
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211 | Static Function IEEERemainder(value1 As Double,value2 As Double) As Double |
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212 | Dim q As Double |
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213 | If value2=0 then return _System_GetNaN() |
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214 | q=value1/value2 |
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215 | If q<>Int(q) then |
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216 | If q+0.5<>Int(q+0.5) then |
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217 | q=Int(q+0.5) |
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218 | ElseIf Int(q+0.5)=Int(q*2+1)/2 then |
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219 | q=Int(q+0.5) |
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220 | Else |
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221 | q=Int(q-0.5) |
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222 | End If |
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223 | End If |
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224 | If x-y*q=0 then |
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225 | If x>0 then |
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226 | return +0 |
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227 | Else |
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228 | return -0 |
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229 | End If |
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230 | Else |
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231 | return x-y*q |
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232 | End If |
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233 | End Function |
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234 | |
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235 | Static Function Log(x As Double) As Double |
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236 | If x = 0 Then |
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237 | Log = _System_GetInf(TRUE) |
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238 | ElseIf x < 0 Or IsNaN(x) Then |
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239 | Log = _System_GetNaN() |
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240 | ElseIf IsInf(x) Then |
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241 | Log = x |
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242 | Else |
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243 | Dim i As Long, k As Long |
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244 | Dim s As Double, t As Double |
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245 | frexp(x / _System_SQRT2, k) |
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246 | x /= ldexp(1, k) |
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247 | |
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248 | x-- |
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249 | s = 0 |
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250 | i = _System_Log_N |
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251 | While i >= 1 |
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252 | t = i * x |
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253 | s = t / (2 + t / (2 * i + 1 + s)) |
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254 | i-- |
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255 | Wend |
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256 | |
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257 | Log = _System_LOG2 * k + x / (1 + s) |
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258 | End If |
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259 | End Function |
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260 | |
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261 | Static Function Log10(x As Double) As Double |
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262 | Return Log(x) / Log(10) |
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263 | End Function |
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264 | |
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265 | Static Function Max(value1 As Byte,value2 As Byte) As Byte |
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266 | If value1>value2 then |
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267 | return value1 |
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268 | Else |
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269 | return value2 |
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270 | End If |
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271 | End Function |
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272 | |
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273 | Static Function Max(value1 As Char,value2 As Char) As Char |
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274 | If value1>value2 then |
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275 | return value1 |
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276 | Else |
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277 | return value2 |
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278 | End If |
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279 | End Function |
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280 | |
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281 | Static Function Max(value1 As Word,value2 As Word) As Word |
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282 | If value1>value2 then |
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283 | return value1 |
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284 | Else |
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285 | return value2 |
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286 | End If |
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287 | End Function |
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288 | |
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289 | Static Function Max(value1 As Integer,value2 As Integer) As Integer |
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290 | If value1>value2 then |
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291 | return value1 |
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292 | Else |
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293 | return value2 |
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294 | End If |
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295 | End Function |
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296 | |
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297 | Static Function Max(value1 As DWord,value2 As DWord) As DWord |
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298 | If value1>value2 then |
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299 | return value1 |
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300 | Else |
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301 | return value2 |
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302 | End If |
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303 | End Function |
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304 | |
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305 | Static Function Max(value1 As Long,value2 As Long) As Long |
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306 | If value1>value2 then |
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307 | return value1 |
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308 | Else |
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309 | return value2 |
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310 | End If |
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311 | End Function |
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312 | |
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313 | Static Function Max(value1 As QWord,value2 As QWord) As QWord |
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314 | If value1>value2 then |
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315 | return value1 |
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316 | Else |
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317 | return value2 |
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318 | End If |
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319 | End Function |
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320 | |
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321 | Static Function Max(value1 As Int64,value2 As Int64) As Int64 |
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322 | If value1>value2 then |
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323 | return value1 |
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324 | Else |
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325 | return value2 |
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326 | End If |
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327 | End Function |
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328 | |
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329 | Static Function Max(value1 As Single,value2 As Single) As Single |
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330 | If value1>value2 then |
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331 | return value1 |
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332 | Else |
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333 | return value2 |
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334 | End If |
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335 | End Function |
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336 | |
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337 | Static Function Max(value1 As Double,value2 As Double) As Double |
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338 | If value1>value2 then |
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339 | return value1 |
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340 | Else |
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341 | return value2 |
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342 | End If |
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343 | End Function |
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344 | |
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345 | Static Function Min(value1 As Byte,value2 As Byte) As Byte |
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346 | If value1<value2 then |
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347 | return value1 |
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348 | Else |
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349 | return value2 |
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350 | End If |
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351 | End Function |
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352 | |
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353 | Static Function Min(value1 As Char,value2 As Char) As Char |
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354 | If value1<value2 then |
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355 | return value1 |
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356 | Else |
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357 | return value2 |
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358 | End If |
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359 | End Function |
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360 | |
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361 | Static Function Min(value1 As Word,value2 As Word) As Word |
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362 | If value1<value2 then |
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363 | return value1 |
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364 | Else |
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365 | return value2 |
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366 | End If |
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367 | End Function |
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368 | |
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369 | Static Function Min(value1 As Integer,value2 As Integer) As Integer |
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370 | If value1<value2 then |
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371 | return value1 |
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372 | Else |
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373 | return value2 |
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374 | End If |
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375 | End Function |
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376 | |
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377 | Static Function Min(value1 As DWord,value2 As DWord) As DWord |
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378 | If value1<value2 then |
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379 | return value1 |
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380 | Else |
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381 | return value2 |
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382 | End If |
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383 | End Function |
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384 | |
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385 | Static Function Min(value1 As Long,value2 As Long) As Long |
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386 | If value1<value2 then |
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387 | return value1 |
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388 | Else |
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389 | return value2 |
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390 | End If |
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391 | End Function |
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392 | |
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393 | Static Function Min(value1 As QWord,value2 As QWord) As QWord |
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394 | If value1<value2 then |
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395 | return value1 |
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396 | Else |
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397 | return value2 |
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398 | End If |
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399 | End Function |
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400 | |
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401 | Static Function Min(value1 As Int64,value2 As Int64) As Int64 |
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402 | If value1<value2 then |
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403 | return value1 |
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404 | Else |
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405 | return value2 |
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406 | End If |
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407 | End Function |
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408 | |
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409 | Static Function Min(value1 As Single,value2 As Single) As Single |
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410 | If value1<value2 then |
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411 | return value1 |
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412 | Else |
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413 | return value2 |
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414 | End If |
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415 | End Function |
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416 | |
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417 | Static Function Min(value1 As Double,value2 As Double) As Double |
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418 | If value1<value2 then |
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419 | return value1 |
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420 | Else |
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421 | return value2 |
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422 | End If |
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423 | End Function |
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424 | |
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425 | Static Function Pow(x As Double, y As Double) As Double |
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426 | return pow(x, y) |
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427 | End Function |
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428 | |
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429 | 'ReferenceEquals |
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430 | |
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431 | Static Function Round(value As Double) As Double'他のバージョン、誰か頼む。 |
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432 | If value+0.5<>Int(value+0.5) then |
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433 | value=Int(value+0.5) |
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434 | ElseIf Int(value+0.5)=Int(value*2+1)/2 then |
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435 | value=Int(value+0.5) |
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436 | Else |
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437 | value=Int(value-0.5) |
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438 | End If |
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439 | End Function |
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440 | |
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441 | Static Function Sign(value As Double) As Long |
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442 | If value = 0 then |
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443 | return 0 |
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444 | ElseIf value > 0 then |
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445 | return 1 |
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446 | Else |
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447 | return -1 |
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448 | End If |
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449 | End Function |
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450 | |
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451 | Static Function Sign(value As Char) As Long |
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452 | If value = 0 then |
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453 | return 0 |
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454 | ElseIf value > 0 then |
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455 | return 1 |
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456 | Else |
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457 | return -1 |
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458 | End If |
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459 | End Function |
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460 | |
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461 | Static Function Sign(value As Integer) As Long |
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462 | If value = 0 then |
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463 | return 0 |
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464 | ElseIf value > 0 then |
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465 | return 1 |
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466 | Else |
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467 | return -1 |
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468 | End If |
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469 | End Function |
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470 | |
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471 | Static Function Sign(value As Long) As Long |
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472 | If value = 0 then |
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473 | return 0 |
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474 | ElseIf value > 0 then |
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475 | return 1 |
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476 | Else |
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477 | return -1 |
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478 | End If |
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479 | End Function |
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480 | |
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481 | Static Function Sign(value As Int64) As Long |
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482 | If value = 0 then |
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483 | return 0 |
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484 | ElseIf value > 0 then |
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485 | return 1 |
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486 | Else |
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487 | return -1 |
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488 | End If |
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489 | End Function |
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490 | |
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491 | Static Function Sign(value As Single) As Long |
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492 | If value = 0 then |
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493 | return 0 |
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494 | ElseIf value > 0 then |
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495 | return 1 |
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496 | Else |
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497 | return -1 |
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498 | End If |
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499 | End Function |
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500 | |
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501 | Static Function Sin(value As Double) As Double |
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502 | If IsNaN(value) Then |
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503 | Return value |
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504 | ElseIf IsInf(value) Then |
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505 | Return _System_GetNaN() |
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506 | Exit Function |
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507 | End If |
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508 | |
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509 | Dim k As Long |
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510 | Dim t As Double |
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511 | |
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512 | t = urTan((value * 0.5) As Double, k) |
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513 | t = 2 * t / (1 + t * t) |
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514 | If (k And 1) = 0 Then 'k mod 2 = 0 Then |
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515 | Return t |
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516 | Else |
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517 | Return -t |
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518 | End If |
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519 | End Function |
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520 | |
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521 | Static Function Sinh(x As Double) As Double |
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522 | If Abs(x) > _System_EPS5 Then |
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523 | Dim t As Double |
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524 | t = Exp(x) |
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525 | Return (t - 1 / t) * 0.5 |
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526 | Else |
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527 | Return x * (1 + x * x * 0.166666666666667) ' x * (1 + x * x / 6) |
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528 | End If |
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529 | End Function |
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530 | |
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531 | Static Function Sqrt(x As Double) As Double |
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532 | Dim s As Double, last As Double |
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533 | Dim i As *Word, j As Long, jj As Long, k As Long |
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534 | If x > 0 Then |
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535 | If IsInf(x) Then |
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536 | Sqrt = x |
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537 | Else |
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538 | Sqrt = x |
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539 | i = (VarPtr(Sqrt) + 6) As *Word |
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540 | jj = GetWord(i) |
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541 | j = jj >> 5 |
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542 | k = jj And &h0000001f |
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543 | j = (j+ 511) << 4 + k |
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544 | SetWord(i, j) |
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545 | Do |
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546 | last = Sqrt |
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547 | Sqrt = (x /Sqrt + Sqrt) * 0.5 |
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548 | Loop While Sqrt <> last |
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549 | End If |
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550 | ElseIf x < 0 Then |
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551 | Sqrt = _System_GetNaN() |
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552 | Else |
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553 | 'x = 0 Or NaN |
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554 | Sqrt = x |
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555 | End If |
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556 | End Function |
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557 | |
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558 | Static Function Tan(x As Double) As Double |
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559 | If IsNaN(x) Then |
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560 | Tan = x |
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561 | Exit Function |
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562 | ElseIf IsInf(x) Then |
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563 | Tan = _System_GetNaN() |
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564 | Exit Function |
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565 | End If |
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566 | |
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567 | Dim k As Long |
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568 | Dim t As Double |
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569 | t = urTan(x, k) |
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570 | If (k And 1) = 0 Then 'k mod 2 = 0 Then |
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571 | Return t |
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572 | ElseIf t <> 0 Then |
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573 | Return -1 / t |
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574 | Else |
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575 | Return CopySign(_System_GetInf(FALSE), -t) |
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576 | End If |
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577 | End Function |
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578 | |
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579 | Static Function Tanh(x As Double) As Double |
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580 | If x > _System_EPS5 Then |
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581 | Return 2 / (1 + Exp(-2 * x)) - 1 |
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582 | ElseIf x < -_System_EPS5 Then |
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583 | Return 1 - 2 / (Exp(2 * x) + 1) |
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584 | Else |
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585 | Return x * (1 - x * x * 0.333333333333333) 'x * (1 - x * x / 3) |
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586 | End If |
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587 | End Function |
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588 | |
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589 | 'ToString |
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590 | |
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591 | Static Function Truncate(x As Double) As Double |
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592 | return Fix(x) |
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593 | End Function |
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594 | |
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595 | 'Private |
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596 | Static Function urTan(x As Double, ByRef k As Long) As Double |
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597 | Dim i As Long |
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598 | Dim t As Double, x2 As Double |
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599 | |
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600 | If x >= 0 Then |
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601 | k = Fix(x * _System_InverseHalfPI) + 0.5 |
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602 | Else |
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603 | k = Fix(x * _System_InverseHalfPI) - 0.5 |
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604 | End If |
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605 | x = (x - (3217.0 / 2048.0) * k) + _System_D * k |
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606 | x2 = x * x |
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607 | t = 0 |
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608 | For i = _System_UrTan_N To 3 Step -2 |
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609 | t = x2 / (i - t) |
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610 | Next i |
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611 | urTan = x / (1 - t) |
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612 | End Function |
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613 | End Class |
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614 | |
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615 | Const _System_Log_N = 7 |
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616 | Const _System_Atan_N = 20 |
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617 | Const _System_UrTan_N = 17 |
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618 | Const _System_D = 4.4544551033807686783083602485579e-6 |
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619 | Const _System_HalfPI = (_System_PI * 0.5) |
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620 | Const _System_InverseHalfPI = (2 / _System_PI) '1 / (PI / 2) |
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621 | |
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622 | #endif '__SYSTEM_MATH_AB__ |
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