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opennurbs_color.cpp
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opennurbs_color.cpp
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/* $NoKeywords: $ */
/*
//
// Copyright (c) 1993-2012 Robert McNeel & Associates. All rights reserved.
// OpenNURBS, Rhinoceros, and Rhino3D are registered trademarks of Robert
// McNeel & Associates.
//
// THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT EXPRESS OR IMPLIED WARRANTY.
// ALL IMPLIED WARRANTIES OF FITNESS FOR ANY PARTICULAR PURPOSE AND OF
// MERCHANTABILITY ARE HEREBY DISCLAIMED.
//
// For complete openNURBS copyright information see <http://www.opennurbs.org>.
//
////////////////////////////////////////////////////////////////
*/
#include "opennurbs.h"
#if !defined(ON_COMPILING_OPENNURBS)
// This check is included in all opennurbs source .c and .cpp files to insure
// ON_COMPILING_OPENNURBS is defined when opennurbs source is compiled.
// When opennurbs source is being compiled, ON_COMPILING_OPENNURBS is defined
// and the opennurbs .h files alter what is declared and how it is declared.
#error ON_COMPILING_OPENNURBS must be defined when compiling opennurbs
#endif
const ON_Color ON_Color::RandomColor()
{
return RandomColor(ON_RandomNumberGenerator::RandomSeed());
}
const ON_Color ON_Color::RandomColor(
ON_Interval hue_range,
ON_Interval saturation_range,
ON_Interval value_range
)
{
return RandomColor(ON_RandomNumberGenerator::RandomSeed(), hue_range, saturation_range, value_range);
}
const ON_Color ON_Color::RandomColor(
ON__UINT32 seed
)
{
return ON_Color::RandomColor(seed, ON_Interval::ZeroToTwoPi, ON_Interval::Singleton(1.0), ON_Interval::Singleton(1.0));
}
const ON_Color ON_Color::RandomColor(
ON__UINT32 seed,
ON_Interval hue_range,
ON_Interval saturation_range,
ON_Interval value_range
)
{
ON_RandomNumberGenerator rg;
rg.Seed(seed + 1U); // the +1 is so the colors for seeds (0,1,2,3,4,5 are more vistually distinct)
const double h = hue_range.IsSingleton() ? hue_range.m_t[0] : rg.RandomDouble(hue_range);
double s = saturation_range.IsSingleton() ? saturation_range.m_t[0] : rg.RandomDouble(saturation_range);
if (s > ON_UNSET_VALUE && s < ON_UNSET_POSITIVE_VALUE)
{
if (s < 0.0)
s = 0.0;
else if (s > 1.0)
s = 1.0;
}
else
s = 1.0;
double v = value_range.IsSingleton() ? value_range.m_t[0] : rg.RandomDouble(value_range);
if (v > ON_UNSET_VALUE && v < ON_UNSET_POSITIVE_VALUE)
{
if (v < 0.0)
v = 0.0;
else if (v > 1.0)
v = 1.0;
}
else
v = 1.0;
ON_Color color = ON_Color::UnsetColor;
if (ON_IsValid(h) && ON_IsValid(s) && ON_IsValid(v))
color.SetHSV( fmod(h,ON_2PI), s, v );
return color;
}
ON_Color::ON_Color(unsigned int colorref)
: m_color(colorref)
{
// No adjustments are required on big endian computers because all
// unsigned int conversion and all IO preserves the order of the
// ON_Color::m_RGBA[4] bytes.
}
ON_Color::ON_Color(int r, int g, int b)
{
SetRGB(r,g,b);
}
ON_Color::ON_Color(int r, int g, int b, int a)
{
SetRGBA(r,g,b,a);
}
unsigned int ON_Color::WindowsRGB() const
{
ON_Color RGB = ON_Color(Red(),Green(),Blue());
return RGB;
}
ON_Color::operator unsigned int() const
{
// No adjustments are required on big endian computers because all
// unsigned int conversion and all IO preserves the order of the
// ON_Color::m_RGBA[4] bytes.
return m_color;
}
int ON_Color::Compare( const ON_Color& b ) const
{
int ac = (int)m_color;
int bc = (int)b.m_color;
#if defined(ON_BIG_ENDIAN)
unsigned char* swapper = (unsigned char*)∾
unsigned char c = swapper[0]; swapper[0] = swapper[3]; swapper[3] = c;
c = swapper[1]; swapper[1] = swapper[2]; swapper[2] = c;
swapper = (unsigned char*)&bc;
c = swapper[0]; swapper[0] = swapper[3]; swapper[3] = c;
c = swapper[1]; swapper[1] = swapper[2]; swapper[2] = c;
#endif
return ac-bc; // overflow roll over is fine - important thing is that answer is consistent.
}
int ON_Color::Red() const
{ return m_RGBA[ON_Color::kRedByteIndex];}
int ON_Color::Green() const
{ return m_RGBA[ON_Color::kGreenByteIndex];}
int ON_Color::Blue() const
{ return m_RGBA[ON_Color::kBlueByteIndex];}
int ON_Color::Alpha() const
{ return m_RGBA[ON_Color::kAlphaByteIndex];}
double ON_Color::FractionRed() const
{
//return Red()/255.0;
return m_RGBA[ON_Color::kRedByteIndex]*0.003921568627450980392156862745; // better fodder for optimizer
}
double ON_Color::FractionGreen() const
{
//return Green()/255.0;
return m_RGBA[ON_Color::kGreenByteIndex]*0.003921568627450980392156862745; // better fodder for optimizer
}
double ON_Color::FractionBlue() const
{
//return Blue()/255.0;
return m_RGBA[ON_Color::kBlueByteIndex]*0.003921568627450980392156862745; // better fodder for optimizer
}
double ON_Color::FractionAlpha() const
{
//return Alpha()/255.0;
return m_RGBA[ON_Color::kAlphaByteIndex]*0.003921568627450980392156862745; // better fodder for optimizer
}
void ON_Color::SetRGB(int r,int g,int b) // 0 to 255
{
SetRGBA(r,g,b,0);
}
void ON_Color::SetFractionalRGB(double r,double g,double b)
{
SetFractionalRGBA(r,g,b,0.0);
}
void ON_Color::SetAlpha(int alpha)
{
if (alpha < 0 ) alpha = 0; else if ( alpha > 255 ) alpha = 255;
m_RGBA[ON_Color::kAlphaByteIndex] = (unsigned char)alpha;
}
void ON_Color::SetFractionalAlpha(double alpha)
{
if (alpha < 0.0 ) alpha = 0.0; else if ( alpha > 1.0 ) alpha = 1.0;
SetAlpha((int)(alpha*255.0));
}
void
ON_Color::SetRGBA( int red, int green, int blue, int alpha )
{
if (red < 0 ) red = 0; else if ( red > 255 ) red = 255;
if (green < 0 ) green = 0; else if ( green > 255 ) green = 255;
if (blue < 0 ) blue = 0; else if ( blue > 255 ) blue = 255;
if (alpha < 0 ) alpha = 0; else if ( alpha > 255 ) alpha = 255;
m_RGBA[ON_Color::kRedByteIndex] = (unsigned char)red;
m_RGBA[ON_Color::kGreenByteIndex] = (unsigned char)green;
m_RGBA[ON_Color::kBlueByteIndex] = (unsigned char)blue;
m_RGBA[ON_Color::kAlphaByteIndex] = (unsigned char)alpha;
}
void
ON_Color::SetFractionalRGBA( double red, double green, double blue, double alpha )
{
int r,g,b,a;
if (red < 0.0 ) red = 0.0; else if ( red > 1.0 ) red = 1.0;
if (green < 0.0 ) green = 0.0; else if ( green > 1.0 ) green = 1.0;
if (blue < 0.0 ) blue = 0.0; else if ( blue > 1.0 ) blue = 1.0;
if (alpha < 0.0 ) alpha = 0.0; else if ( alpha > 1.0 ) alpha = 1.0;
red *= 255.0;
green *= 255.0;
blue *= 255.0;
alpha *= 255.0;
r = (int)red;
g = (int)green;
b = (int)blue;
a = (int)alpha;
// round to closest int
if( (red-r)>=0.5 ) r++;
if( (green-g)>=0.5 ) g++;
if( (blue-b)>=0.5 ) b++;
if( (alpha-a)>=0.5 ) a++;
SetRGBA( r, g, b, a );
}
double ON_Color::Hue() const
{
// returns 0 to 2*pi
// 0 = red, pi/3 = yellow, 2*pi/3 = green,
// pi = cyan, 4*pi/3 = blue, 5*pi/3 = magenta,
// 2*pi = red
double h;
int r = Red();
int g = Green();
int b = Blue();
int minrgb, maxrgb;
if ( r <= g ) {minrgb = r; maxrgb = g;} else {minrgb = g; maxrgb = r;}
if (minrgb > b) minrgb = b; else if (maxrgb < b ) maxrgb = b;
if ( maxrgb != minrgb ) {
double d = 1.0/(maxrgb - minrgb);
if ( r == maxrgb) {
h = (g - b)*d;
if ( h < 0.0 )
h += 6.0;
}
else if ( g == maxrgb)
h = 2.0 + (b - r)*d;
else
h = 4.0 + (r - g)*d;
h *= ON_PI/3.0;
}
else
h = 0.0;
return h;
}
double ON_Color::Saturation() const
{
// 0.0 to 1.0 0.0 = gray, 1.0 = saturated
double s;
int r = Red();
int g = Green();
int b = Blue();
int minrgb, maxrgb;
if ( r <= g ) {minrgb = r; maxrgb = g;} else {minrgb = g; maxrgb = r;}
if (minrgb > b) minrgb = b; else if (maxrgb < b ) maxrgb = b;
if ( maxrgb > 0 ) {
s = ((double)(maxrgb - minrgb))/((double)maxrgb);
}
else
s = 0.0;
return s;
}
double ON_Color::Value() const
{
// 0.0 to 1.0 0.0 = black, 1.0 = white
int r = Red();
int g = Green();
int b = Blue();
int maxrgb = ( r <= g ) ? g : r; if ( maxrgb < b ) maxrgb = b;
return (maxrgb/255.0);
}
void ON_Color::SetHSV(
double hue, // hue in radians
double saturation, // satuation 0.0 = gray, 1.0 = saturated
double value // value
)
{
int i;
double f, p, q, t, r, g, b;
if ( saturation <= 1.0/256.0 ) {
r = value;
g = value;
b = value;
}
else {
hue *= 3.0 / ON_PI; // (6.0 / 2.0 * ON_PI);
i = (int)floor(hue);
if ( i < 0 || i > 5 ) {
hue = fmod(hue,6.0);
if ( hue < 0.0 )
hue += 6.0;
i = (int)floor(hue);
}
f = hue - i;
p = value * ( 1.0 - saturation);
q = value * ( 1.0 - ( saturation * f) );
t = value * ( 1.0 - ( saturation * ( 1.0 - f) ) );
switch( i)
{
case 0:
r = value; g = t; b = p; break;
case 1:
r = q; g = value; b = p; break;
case 2:
r = p; g = value; b = t; break;
case 3:
r = p; g = q; b = value; break;
case 4:
r = t; g = p; b = value; break;
case 5:
r = value; g = p; b = q; break;
default:
r = 0; g = 0; b = 0; break; // to keep lint quiet
}
}
SetFractionalRGB(r,g,b);
}
const ON_wString ON_Color::ToString(
ON_Color::TextFormat format,
wchar_t separator,
bool bFormatUnsetColor,
class ON_TextLog& text_log
) const
{
ON_wString s;
if (ON_Color::UnsetColor == *this)
{
if (bFormatUnsetColor)
s = L"ON_Color::UnsetColor";
}
else
{
if (0 != Alpha())
{
// handle conditional alpha case
switch (format)
{
case ON_Color::TextFormat::FractionalRGBa:
format = ON_Color::TextFormat::FractionalRGBA;
break;
case ON_Color::TextFormat::DecimalRGBa:
format = ON_Color::TextFormat::DecimalRGBA;
break;
case ON_Color::TextFormat::HexadecimalRGBa:
format = ON_Color::TextFormat::HexadecimalRGBA;
break;
case ON_Color::TextFormat::HSVa:
format = ON_Color::TextFormat::HSVA;
break;
}
}
if (0 == separator)
separator = ',';
switch (format)
{
case ON_Color::TextFormat::Unset:
// intentionally returns empty string.
break;
case ON_Color::TextFormat::FractionalRGB:
case ON_Color::TextFormat::FractionalRGBa: // nonzero alpha handled above
s = ON_wString::FormatToString(L"%g%lc%g%lc%g", FractionRed(), separator, FractionGreen(), separator, FractionBlue());
break;
case ON_Color::TextFormat::FractionalRGBA:
s = ON_wString::FormatToString(L"%g%lc%g%lc%g%lc%g", FractionRed(), separator, FractionGreen(), separator, FractionBlue(), separator, FractionAlpha());
break;
case ON_Color::TextFormat::DecimalRGB:
case ON_Color::TextFormat::DecimalRGBa: // nonzero alpha handled above
s = ON_wString::FormatToString(L"%d%lc%d%lc%d", Red(), separator, Green(), separator, Blue());
break;
case ON_Color::TextFormat::DecimalRGBA:
s = ON_wString::FormatToString(L"%d%lc%d%lc%d%lc%d", Red(), separator, Green(), separator, Blue(), separator, Alpha());
break;
case ON_Color::TextFormat::HexadecimalRGB:
case ON_Color::TextFormat::HexadecimalRGBa: // nonzero alpha handled above
s = ON_wString::FormatToString(L"%02x%lc%02x%lc%02x", Red(), separator, Green(), separator, Blue());
break;
case ON_Color::TextFormat::HexadecimalRGBA:
s = ON_wString::FormatToString(L"%02x%lc%02x%lc%02x%lc%02x", Red(), separator, Green(), separator, Blue(), separator, Alpha());
break;
case ON_Color::TextFormat::HSV:
case ON_Color::TextFormat::HSVa: // nonzero alpha handled above
s = ON_wString::FormatToString(L"%g%lc%g%lc%g", Hue(), separator, Saturation(), separator, Value());
break;
case ON_Color::TextFormat::HSVA:
s = ON_wString::FormatToString(L"%g%lc%g%lc%g%lc%g", Hue(), separator, Saturation(), separator, Value(), separator, FractionAlpha());
break;
}
}
return s;
}
void ON_Color::ToText(
ON_Color::TextFormat format,
wchar_t separator,
bool bFormatUnsetColor,
class ON_TextLog& text_log
) const
{
const ON_wString s = ToString(format, separator, bFormatUnsetColor, text_log);
if (s.IsNotEmpty())
text_log.Print(L"%ls", static_cast<const wchar_t*>(s));
}
ON_ColorStop::ON_ColorStop(const ON_Color& color, double position)
: m_color(color)
, m_position(position)
{
}
ON_4fColor::ON_4fColor()
{
for (int i = 0; i < 4; i++)
{
m_color[i] = ON_UNSET_FLOAT;
}
}
//Note that these function will set the alpha correctly from ON_Colors "inverted" alpha.
ON_4fColor::ON_4fColor(const ON_Color& in)
{
*this = in;
}
ON_4fColor& ON_4fColor::operator=(const ON_Color& in)
{
SetRed((float)in.FractionRed());
SetGreen((float)in.FractionGreen());
SetBlue((float)in.FractionBlue());
SetAlpha(1.0f - (float)in.FractionAlpha());
return *this;
}
//Will invert the opacity alpha to transparency.
ON_4fColor::operator ON_Color(void) const
{
ON_Color out;
out.SetFractionalRGBA(Red(), Green(), Blue(), 1.0 - Alpha());
return out;
}
float ON_4fColor::Red(void) const { return m_color[0];}
void ON_4fColor::SetRed(float f) { m_color[0] = f;}
float ON_4fColor::Green(void) const { return m_color[1];}
void ON_4fColor::SetGreen(float f) { m_color[1] = f;}
float ON_4fColor::Blue(void) const { return m_color[2]; }
void ON_4fColor::SetBlue(float f) { m_color[2] = f; }
float ON_4fColor::Alpha(void) const { return m_color[3]; }
void ON_4fColor::SetAlpha(float f) { m_color[3] = f; }
void ON_4fColor::SetRGBA(float r, float g, float b, float a)
{
m_color[0] = r;
m_color[1] = g;
m_color[2] = b;
m_color[3] = a;
}
bool ON_4fColor::IsValid(class ON_TextLog* text_log) const
{
for (int i = 0; i < 4; i++)
{
if (ON_IS_UNSET_FLOAT(m_color[i]))
return false;
}
return true;
}
bool ON_ColorStop::Write(ON_BinaryArchive& archive) const
{
bool rc = archive.BeginWrite3dmChunk(TCODE_ANONYMOUS_CHUNK, 1, 0);
if (!rc)
return false;
for (;;)
{
rc = archive.WriteColor(m_color);
if (!rc) break;
rc = archive.WriteDouble(m_position);
if (!rc) break;
break;
}
if (!archive.EndWrite3dmChunk())
rc = false;
return rc;
}
bool ON_ColorStop::Read(ON_BinaryArchive& file)
{
int major_version = 0;
int minor_version = 0;
bool rc = file.BeginRead3dmChunk(TCODE_ANONYMOUS_CHUNK, &major_version, &minor_version);
if (!rc)
return false;
for (;;)
{
rc = (1 == major_version);
if (!rc) break;
rc = file.ReadColor(m_color);
if (!rc) break;
rc = file.ReadDouble(&m_position);
if (!rc) break;
break;
}
if (!file.EndRead3dmChunk())
rc = false;
return rc;
}
static int CompareNans(double a, double b)
{
if (a == a)
{
if (b == b)
{
return ((a < b) ? -1 : ((a > b) ? 1 : 0));
}
// a is not a NAN, b is a NAN
return -1; // a < b - NAN's are last
}
else if (b == b)
{
// a is a NAN, b is not a NAN
return -1; // b < a - NAN's are last
}
return 0; // a and b are both NaNs
}
static int CompareDouble(double a, double b)
{
return ((a < b) ? -1 : ((a > b) ? 1 : (a == b ? 0 : CompareNans(a, b))));
}
// < 0 if this < arg, 0 ir this==arg, > 0 if this > arg
int ON_4fColor::Compare(const ON_4fColor& b) const
{
int rc = CompareDouble(Red(), b.Red());
if (0 != rc)
return rc;
rc = CompareDouble(Green(), b.Green());
if (0 != rc)
return rc;
rc = CompareDouble(Blue(), b.Blue());
if (0 != rc)
return rc;
rc = CompareDouble(Alpha(), b.Alpha());
return rc;
}