evd::ColorScale Class Reference

Build an association between a numerical range and a ROOT color index for use in, eg., the event display. More...

#include <ColorScale.h>

List of all members.

Public Member Functions
	ColorScale (double xlo, double xhi, int which=kRainbow, int scale=kLinear, int n=40, double h1=0, double h1=0, double v1=0, double v2=0)
int	operator() (double x) const
int	GetColor (double x) const
void	SetPalette ()
Private Member Functions
void	HSVtoRGB (double h, double s, double v, double *r, double *g, double *b) const
void	MakeHSVScale (int n, double h1, double h2, double vs1, double vs2)
	Make a color scale of n colors ranging between two points in an HSV color space.
Private Attributes
double	fXlo
double	fXhi
	Numeric value at low end of scale.
int	fScale
	Numeric value at high end of scale.
int	fNcolor
	Linear? Log? Sqrt?
int	fColors [128]
	How many colors in scale?

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Detailed Description

Build an association between a numerical range and a ROOT color index for use in, eg., the event display.

Definition at line 34 of file ColorScale.h.

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Constructor & Destructor Documentation

ColorScale::ColorScale (  double  xlo, double  xhi, int  which = kRainbow, int  scale = kLinear, int  n = 40, double  h1 = 0, double  h2 = 0, double  v1 = 0, double  v2 = 0 )

Construct a color scale Parameters: xlo  - The value at the low end of the scale xhi  - The value at the high end of the scale which  - Which color map to use (see enum's in ColorScale.h) scale  - How to scale range (see enum's in ColorScale.h) n  - How many colors to use h1  - First H value in range h2  - Last H value in range v1  - First V value in range v2  - Last V value in range Definition at line 28 of file ColorScale.cxx. References evd::kBlues, evd::kColdToHot, evd::kCustom, evd::kGeographic, evd::kGreens, evd::kHeatedObject, evd::kRainbow, evd::kReds, and MakeHSVScale(). : fXlo(xlo), fXhi(xhi), fScale(scale) { switch(which) { case kColdToHot: this->MakeHSVScale(n, 150.0, 0.0, 0.2, 0.5); break; case kHeatedObject: this->MakeHSVScale(n, 60.0, 0.0, 0.1, 0.9); break; case kReds: this->MakeHSVScale(n, 30.0, 0.0, 0.1, 0.9); break; case kBlues: this->MakeHSVScale(n, 180.0, 270.0, 0.1, 0.9); break; case kGreens: this->MakeHSVScale(n, 90.0, 120.0, 0.1, 0.9); break; case kGeographic: this->MakeHSVScale(n, 270.0, 30.0, 0.9, 0.05); break; case kCustom: this->MakeHSVScale(n, h1, h2, v1, v2); break; case kRainbow: // Default to a rainbow. default: this->MakeHSVScale(16,270,0,0.1,0.6); break; } }

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Member Function Documentation

int ColorScale::GetColor (  double  x  )  const

Assign a ROOT color index to the value x Parameters: x  - the value on the scale Returns: A ROOT color number Definition at line 58 of file ColorScale.cxx. References fColors, fNcolor, fScale, fXhi, fXlo, evd::kLinear, evd::kLog, and evd::kSqrt. Referenced by evd::Display3D::DrawRawData(), and operator()(). { double f=0.0; if (fScale == kLinear) { f = (x-fXlo)/(fXhi-fXlo); } else if (fScale == kLog) { f = (log(x)-log(fXlo))/(log(fXhi)-log(fXlo)); } else if (fScale == kSqrt) { f = (sqrt(x)-sqrt(fXlo))/(sqrt(fXhi)-sqrt(fXlo)); } int indx = (int)floor(f*(float)fNcolor); if (indx<0) indx = 0; if (indx>=fNcolor) indx = fNcolor-1; return fColors[indx]; }

void ColorScale::HSVtoRGB (  double  h, double  s, double  v, double *  r, double *  g, double *  b )  const [private]

Convert hue, saturation and value numbers to red, green, blue Parameters: h  - hue (in range from 0 to 360) s  - saturation v  - value r  - returned r value g  - returned g value b  - returned b value Definition at line 91 of file ColorScale.cxx. Referenced by MakeHSVScale(). { // A-chromatic, return grey scale values if (s==0.0) { *r = *g = *b = v; return; } int i; double f, p, q, t; double hh = h; while (hh< 0.0) hh += 360.0; while (hh>360.0) hh -= 360.0; hh /= 60; i = (int)floor(hh); f = hh - i; p = v * (1 - s); q = v * (1 - s*f); t = v * (1 - s*(1-f) ); switch( i ) { case 0: *r = v; *g = t; *b = p; break; case 1: *r = q; *g = v; *b = p; break; case 2: *r = p; *g = v; *b = t; break; case 3: *r = p; *g = q; *b = v; break; case 4: *r = t; *g = p; *b = v; break; default: *r = v; *g = p; *b = q; break; } }

void ColorScale::MakeHSVScale (  int  n, double  h1, double  h2, double  vs1, double  vs2 )  [private]

Make a color scale of n colors ranging between two points in an HSV color space. Choose points so that the value of the colors changes uniformly. This ensures good viewing event in black and white. Parameters: n  - number of colors in the scale h1  - first H value in color scale h2  - second H value in color scale vs1  - first V value in color scale vs2  - second V value in color scale Definition at line 132 of file ColorScale.cxx. References fColors, fNcolor, and HSVtoRGB(). Referenced by ColorScale(). { int i; double r, g, b; double h; double vs, v, s; if (n>128) n = 128; fNcolor = n; for (i=0; i<fNcolor; ++i) { h = h1 + (h2-h1)*(float)i/(float)(fNcolor-1); vs = vs1 + (vs2-vs1)*(float)i/(float)(fNcolor-1); vs = -1.0 + 2.0*vs; if (vs<0.0) { v = 1.0; s = 1.0+vs; } else { v = 1.0-vs; s = 1.0; } this->HSVtoRGB(h, s, v, &r, &g, &b); r *= 255; g *= 255; b *= 255; fColors[i] = TColor::GetColor((int)r,(int)g,(int)b); } }

int ColorScale::operator() (  double  x  )  const

Definition at line 76 of file ColorScale.cxx. References GetColor(). { return this->GetColor(x); }

void ColorScale::SetPalette (   )

Set the ROOT color palette to use this color scale Definition at line 162 of file ColorScale.cxx. References fColors, and fNcolor. { gStyle->SetPalette(fNcolor, fColors); }

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Member Data Documentation

int evd::ColorScale::fColors[128] [private]

How many colors in scale? Definition at line 57 of file ColorScale.h. Referenced by GetColor(), MakeHSVScale(), and SetPalette().

int evd::ColorScale::fNcolor [private]

Linear? Log? Sqrt? Definition at line 56 of file ColorScale.h. Referenced by GetColor(), MakeHSVScale(), and SetPalette().

int evd::ColorScale::fScale [private]

Numeric value at high end of scale. Definition at line 55 of file ColorScale.h. Referenced by GetColor().

double evd::ColorScale::fXhi [private]

Numeric value at low end of scale. Definition at line 54 of file ColorScale.h. Referenced by GetColor().

double evd::ColorScale::fXlo [private]

Definition at line 53 of file ColorScale.h. Referenced by GetColor().

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The documentation for this class was generated from the following files:

• ColorScale.h
• ColorScale.cxx

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