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comparison utilities.d @ 11:d998bf1b0654

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Added utilities and AI; fixed steer
author Mason Green <mason.green@gmail.com>
date Sun, 22 Mar 2009 09:35:24 -0400
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10:bdca08c79cf3 11:d998bf1b0654
1 /*
2 * Copyright (c) 2009, Mason Green (zzzzrrr)
3 * http://www.dsource.org/projects/openmelee
4 *
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without modification,
8 * are permitted provided that the following conditions are met:
9 *
10 * * Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 * * Redistributions in binary form must reproduce the above copyright notice,
13 * this list of conditions and the following disclaimer in the documentation
14 * and/or other materials provided with the distribution.
15 * * Neither the name of the polygonal nor the names of its contributors may be
16 * used to endorse or promote products derived from this software without specific
17 * prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31 module openmelee.utilities;
32
33 import tango.math.random.Kiss : Kiss;
34
35 float scalarRandomWalk(float initial, float walkspeed, float min, float max) {
36
37 float next = initial + (((randomRange(0, 1) * 2) - 1) * walkspeed);
38 if (next < min) return min;
39 if (next > max) return max;
40 return next;
41 }
42
43 // ----------------------------------------------------------------------------
44 // classify a value relative to the interval between two bounds:
45 // returns -1 when below the lower bound
46 // returns 0 when between the bounds (inside the interval)
47 // returns +1 when above the upper bound
48 int intervalComparison(float x, float lowerBound, float upperBound)
49 {
50 if (x < lowerBound) return -1;
51 if (x > upperBound) return +1;
52 return 0;
53 }
54
55 T randomRange(T = int) (T min, T max)
56 {
57 return min + Kiss.instance.natural() % (max + 1 - min);
58 }