dgt.util source code

1 module dgt.util;
2 import core.stdc.math, core.stdc.stdlib;
3 
4 import dgt.array;
5 import dgt.geom;
6 
7 @nogc nothrow:
8 
9 ///A normalized random function
10 float random()
11 {
12     return cast(float) rand() / RAND_MAX;
13 }
14 ///Generate a random float in a range
15 float randomRange(in float min, in float max)
16 {
17     return (max - min) * random() + min;
18 }
19 ///Generate a random int in a range
20 int randomRange(in int min, in int max)
21 {
22     return cast(int)randomRange(cast(float)min, cast(float)max);
23 }
24 ///Generate a vector in a range
25 Vector randomRange(in Vector a, in Vector b)
26 {
27     return Vector(randomRange(a.x, b.x), randomRange(a.y, b.y));
28 }
29 ///Create a null terminated buffer from a string
30 Array!char nullTerminate(in string str)
31 {
32     Array!char nameNullTerminated = Array!char(str.length + 1);
33     for(size_t i = 0; i < str.length; i++)
34         nameNullTerminated.add(str[i]);
35     nameNullTerminated.add('\0');
36     return nameNullTerminated;
37 }
38 unittest
39 {
40     for(size_t i = 0; i < 1000; i++)
41     {
42         Vector vector = randomRange(Vector(-1, -1), Vector(5, 5));
43         assert(vector.x >= -1 && vector.y >= -1 && vector.x < 5 && vector.y < 5);
44     }
45 }
46 unittest
47 {
48     auto str = nullTerminate("Test string");
49     auto expected = "Test string\0";
50     for(size_t i = 0; i < expected.length; i++)
51         assert(str[i] == expected[i]);
52 }