| /******************************************************************************* |
| * Copyright (c) 2014 protos software gmbh (http://www.protos.de). |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * CONTRIBUTORS: |
| * Thomas Schuetz (initial contribution) |
| * |
| *******************************************************************************/ |
| |
| #include "RandomGenerator.h" |
| |
| #ifdef ET_FLOAT64 |
| |
| #include "math.h" |
| |
| void RandomGenerator_init(RandomGenerator* self, etFloat64 seed, etFloat64 min, etFloat64 max){ |
| self->seed = seed; |
| self->min = min; |
| self->max = max; |
| self->range = max-min; |
| self->current = seed; |
| } |
| |
| |
| etFloat64 RandomGenerator_getNext(RandomGenerator* self){ |
| self->seed = 1000. * fabs(log(self->seed)); /* shift comma 3 times to get nice values */ |
| etInt64 resultInt = self->seed; /* get int number left of comma */ |
| self->seed = self->seed - resultInt; /* cut off everything left of comma */ |
| self->current = self->seed*self->range + self->min; /* stretch to range */ |
| self->seed += 0.1; /** seed must always be bigger than 0 for log in next iteration */ |
| |
| return self->current; |
| } |
| |
| #endif |
