voxelman.geometry.rotation source code

1 /**
2 Copyright: Copyright (c) 2016-2018 Andrey Penechko.
3 License: $(WEB boost.org/LICENSE_1_0.txt, Boost License 1.0).
4 Authors: Andrey Penechko.
5 */
6 module voxelman.geometry.rotation;
7 
8 // rotates around Y axis clocwise or counter clockwise
9 // rotType is 0 for 0, 1 for 90, 2 for 180, 3 for 270 degrees
10 T rotatePointCCW(T)(T point, ubyte rotType)
11 {
12 	if (rotType == 1) return rotateCCW90(point);
13 	else if (rotType == 2) return rotateCCW180(point);
14 	else if (rotType == 3) return rotateCCW270(point);
15 	return point;
16 }
17 
18 // ditto
19 T rotatePointCW(T)(T point, ubyte rotType)
20 {
21 	if (rotType == 1) return rotateCCW270(point);
22 	else if (rotType == 2) return rotateCCW180(point);
23 	else if (rotType == 3) return rotateCCW90(point);
24 	return point;
25 }
26 
27 // ditto
28 T rotatePointShiftOriginCW(T)(T point, T size, ubyte rotType)
29 {
30 	if (rotType == 1) return rotateCCW270ShiftOrigin(point, size);
31 	else if (rotType == 2) return rotateCCW180ShiftOrigin(point, size);
32 	else if (rotType == 3) return rotateCCW90ShiftOrigin(point, size);
33 	return point;
34 }
35 
36 T function(T) getCCWRotationFunction(T)(ubyte rotType)
37 {
38 	if (rotType == 1) return &rotateCCW90!T;
39 	else if (rotType == 2) return &rotateCCW180!T;
40 	else if (rotType == 3) return &rotateCCW270!T;
41 	return &rotateCCW0!T;
42 }
43 
44 T function(T, T) getCCWRotationShiftOriginFunction(T)(ubyte rotType)
45 {
46 	if (rotType == 1) return &rotateCCW90ShiftOrigin!T;
47 	else if (rotType == 2) return &rotateCCW180ShiftOrigin!T;
48 	else if (rotType == 3) return &rotateCCW270ShiftOrigin!T;
49 	return &rotateCCW0ShiftOrigin!T;
50 }
51 
52 T rotateCCW0(T)(T point)
53 {
54 	return point;
55 }
56 
57 T rotateCCW90(T)(T point)
58 {
59 	T res = point;
60 	res.x =  point.z;
61 	res.z = -point.x;
62 	return res;
63 }
64 
65 T rotateCCW180(T)(T point)
66 {
67 	T res = point;
68 	res.x = -point.x;
69 	res.z = -point.z;
70 	return res;
71 }
72 
73 T rotateCCW270(T)(T point)
74 {
75 	T res = point;
76 	res.x = -point.z;
77 	res.z =  point.x;
78 	return res;
79 }
80 
81 T rotateCCW90ShiftOrigin(T)(T point, T size)
82 {
83 	T res = point;
84 	res.x =  point.z;
85 	res.z = -point.x + size.x;
86 	return res;
87 }
88 
89 T rotateCCW180ShiftOrigin(T)(T point, T size)
90 {
91 	T res = point;
92 	res.x = -point.x + size.x;
93 	res.z = -point.z + size.z;
94 	return res;
95 }
96 
97 T rotateCCW270ShiftOrigin(T)(T point, T size)
98 {
99 	T res = point;
100 	res.x = -point.z + size.z;
101 	res.z =  point.x;
102 	return res;
103 }
104 
105 T rotateCCW0ShiftOrigin(T)(T point, T size)
106 {
107 	return point;
108 }