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HuePartitioningColors.cc
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40 \*===========================================================================*/
41
42 /*===========================================================================*\
43 * *
44 * $Revision$ *
45 * $Author$ *
46 * $Date$ *
47 * *
48 \*===========================================================================*/
49
50 #include "HuePartitioningColors.hh"
51
52 #include <QColor>
53
54 namespace ACG {
55
56 #define DEFAULT_SATURATION 1.0f
57 #define DEFAULT_VALUE 1.0f
58
59 HuePartitioningColors::HuePartitioningColors(float _alpha, float _baseHue) :
60 currentSubdiv_(2), currentIt_(0), currentTriadIt_(0),
61 alpha_(_alpha), baseHue_(_baseHue),
62 defaultSaturation_(DEFAULT_SATURATION), defaultValue_(DEFAULT_VALUE) {
63 }
64
65 static inline float wrap01(float v) {
66 float dummy;
67 if (v > 1.0f) v = modff(v, &dummy);
68 if (v < 0.0f) v = 1.0f - modff(v, &dummy);
69 return v;
70 }
71
72 Vec4f HuePartitioningColors::generateNextColor() {
73 const float resultHue =
74 baseHue_
75 + .33333333f / currentSubdiv_ * currentIt_
76 + .33333333f * currentTriadIt_;
77
78 // Convert color to RGB and store result.
79 double r, g, b, a;
80 QColor::fromHsvF(wrap01(resultHue), defaultSaturation_,
81 defaultValue_, alpha_).getRgbF(
82 &r, &g, &b, &a);
83 const Vec4f result(r, g, b, alpha_);
84
85 /*
86 * Increment the three level iterator state.
87 */
88
89 // Level 1: Increment triad it.
90 if (++currentTriadIt_ <= 2)
91 return result;
92
93 // Level 2: Increment subdiv it.
94 currentTriadIt_ = 0;
95
96 // Starting from the second subdivison, only visit odd numbers.
97 currentIt_ += (currentSubdiv_ == 2 ? 1 : 2);
98 if (currentIt_ < currentSubdiv_)
99 return result;
100
101 // Level 3: Increment subdivision level.
102 currentIt_ = 1;
103 currentSubdiv_ *= 2;
104
105 return result;
106 }
107
108 } /* namespace ACG */
ACG
Namespace providing different geometric functions concerning angles.
Definition: DBSCANT.cc:51
ACG::HuePartitioningColors::generateNextColor
virtual Vec4f generateNextColor()
Definition: HuePartitioningColors.cc:72
OpenMesh::VectorT
Definition: Vector11T.hh:83
ACG::HuePartitioningColors::HuePartitioningColors
HuePartitioningColors(float _alpha=1.0f, float _baseHue=0.5694f)
Definition: HuePartitioningColors.cc:59