249 lines
7.1 KiB
C++
249 lines
7.1 KiB
C++
/****************************************************************************
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* VCGLib o o *
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* Visual and Computer Graphics Library o o *
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* _ O _ *
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* Copyright(C) 2004 \/)\/ *
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* Visual Computing Lab /\/| *
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* ISTI - Italian National Research Council | *
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* \ *
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* All rights reserved. *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License (http://www.gnu.org/licenses/gpl.txt) *
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* for more details. *
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* *
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****************************************************************************/
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/****************************************************************************
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History
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$Log: not supported by cvs2svn $
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****************************************************************************/
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#ifndef __VCGLIB_COLOR4
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#define __VCGLIB_COLOR4
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#include <vcg/space/point4.h>
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namespace vcg {
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template <class T>
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class Color4 : public Point4<T>
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{
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public:
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/// Constant for storing standard colors.
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/// Each color is stored in a simple in so that the bit pattern match with the one of Color4b.
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enum ColorConstant {
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Black =0xff000000,
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Gray =0xff808080,
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White =0xffffffff,
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Red =0xff0000ff,
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Green =0xff00ff00,
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Blue =0xffff0000,
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Cyan =0xffffff00,
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Yellow =0xff00ffff,
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Magenta=0xffff00ff,
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LightGray =0xffc0c0c0,
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LightRed =0xff8080ff,
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LightGreen =0xff80ff80,
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LightBlue =0xffff8080,
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DarkGray =0xff404040,
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DarkRed =0xff000040,
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DarkGreen =0xff004000,
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DarkBlue =0xff400000,
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};
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inline Color4 ( const T nx, const T ny, const T nz , const T nw ) :Point4<T>(nx,ny,nz,nw) {};
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inline Color4 ( Color4 &c) :Point4<T>(c) {};
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inline Color4 (){};
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inline Color4 (ColorConstant cc);
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template <class Q>
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inline void Import(const Color4<Q> & b )
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{
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_v[0] = T(b[0]);
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_v[1] = T(b[1]);
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_v[2] = T(b[2]);
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_v[3] = T(b[3]);
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}
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inline void Import(const Color4<float> &b);
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inline void Import(const Color4<unsigned char> &b);
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inline void lerp(const Color4 &c0, const Color4 &c1, const float x);
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inline void lerp(const Color4 &c0, const Color4 &c1, const Color4 &c2, const Point3f &ip);
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inline void ColorRamp(const float &minf,const float &maxf ,float v );
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inline void SetRGB( unsigned char r, unsigned char g, unsigned char b )
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{
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_v[0] = r;
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_v[1] = g;
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_v[2] = b;
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_v[3] = 0;
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}
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void SetHSVColor( float h, float s, float v){
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float r,g,b;
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if(s==0.0){ // gray color
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r = g = b = v;
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_v[0]=(unsigned char)(255*r);_v[1]=(unsigned char)(255*g);_v[2]=(unsigned char)(255*b);
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_v[3]=255;
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return;
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}
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if(h==1.0) h = 0.0;
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int i = int( floor(h*6.0) );
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float f = float(h*6.0f - floor(h*6.0f));
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float p = v*(1.0f-s);
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float q = v*(1.0f-s*f);
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float t = v*(1.0f-s*(1.0f-f));
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switch(i){
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case 0: r=v; g=t; b=p; break;
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case 1: r=q; g=v; b=p; break;
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case 2: r=p; g=v; b=t; break;
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case 3: r=p; g=q; b=v; break;
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case 4: r=t; g=p; b=v; break;
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case 5: r=v; g=p; b=q; break;
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}
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_v[0]=(unsigned char)(255*r);_v[1]=(unsigned char)(255*g);_v[2]=(unsigned char)(255*b);
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_v[3]=255;
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// _v[0]=r*256;_v[1]=g*256;_v[2]=b*256;
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}
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inline static Color4 GrayShade(float f)
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{
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return ColorF(f,f,f,1);
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}
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inline void SetGrayShade(float f)
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{
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*this = ColorF(f,f,f,1);
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}
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// Given an integer returns a well ordering of colors
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// so that every color differs as much as possible form the previous one
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// params:
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// n is the maximum expected value (max of the range)
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// v is the requested position
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inline static Color4 Scatter(int n, int a,float Sat=.3f,float Val=.9f)
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{
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int b, k, m=n;
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int r =n;
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for (b=0, k=1; k<n; k<<=1)
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if (a<<1>=m) {
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if (b==0) r = k;
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b += k;
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a -= (m+1)>>1;
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m >>= 1;
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}
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else m = (m+1)>>1;
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if (r>n-b) r = n-b;
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//TRACE("Scatter range 0..%i, in %i out %i\n",n,a,b);
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Color4 rc;
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rc.SetHSVColor(float(b)/float(n),Sat,Val);
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return rc;
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}
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};
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template <class T>
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inline void Color4<T>::lerp(const Color4<T> &c0, const Color4<T> &c1, const float x)
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{
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assert(x>=0);
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assert(x<=1);
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_v[0]=(T)(c1._v[0]*x + c0._v[0]*(1.0f-x));
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_v[1]=(T)(c1._v[1]*x + c0._v[1]*(1.0f-x));
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_v[2]=(T)(c1._v[2]*x + c0._v[2]*(1.0f-x));
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_v[3]=(T)(c1._v[3]*x + c0._v[3]*(1.0f-x));
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}
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template <class T>
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inline void Color4<T>::lerp(const Color4<T> &c0, const Color4<T> &c1, const Color4<T> &c2, const Point3f &ip)
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{
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assert(fabs(ip[0]+ip[1]+ip[2]-1)<0.00001);
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c[0]=(T)(c0.c[0]*ip[0] + c1.c[0]*ip[1]+ c2.c[0]*ip[2]);
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c[1]=(T)(c0.c[1]*ip[0] + c1.c[1]*ip[1]+ c2.c[1]*ip[2]);
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c[2]=(T)(c0.c[2]*ip[0] + c1.c[2]*ip[1]+ c2.c[2]*ip[2]);
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c[3]=(T)(c0.c[3]*ip[0] + c1.c[3]*ip[1]+ c2.c[3]*ip[2]);
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}
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template <class T>
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inline void Color4<T>::ColorRamp(const float &minf,const float &maxf ,float v )
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{
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if(v < minf ) { *this=Color4(Color4::Red); return; }
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float step=(maxf-minf)/4;
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v-=minf;
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if(v<step) {lerp(Color4(Color4::Red), Color4(Color4::Yellow),v/step); return;}
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v-=step;
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if(v<step) {lerp(Color4(Color4::Yellow),Color4(Color4::Green),v/step);return;}
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v-=step;
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if(v<step) {lerp(Color4(Color4::Green),Color4(Color4::Cyan),v/step); return;}
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v-=step;
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if(v<step) {lerp(Color4(Color4::Cyan),Color4(Color4::Blue),v/step); return;}
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*this= Color4(Color4::Blue);
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}
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inline void Color4<float>::Import(const Color4<unsigned char> &b)
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{
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_v[0]=b[0]/255.0f;
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_v[1]=b[1]/255.0f;
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_v[2]=b[2]/255.0f;
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_v[3]=b[3]/255.0f;
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}
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inline void Color4<unsigned char>::Import(const Color4<float> &b)
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{
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_v[0]=(unsigned char)(b[0]*255.0f);
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_v[1]=(unsigned char)(b[1]*255.0f);
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_v[2]=(unsigned char)(b[2]*255.0f);
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_v[3]=(unsigned char)(b[3]*255.0f);
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}
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//template <class T,class S>
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//inline void Color4<T>::Import(const Color4<S> &b)
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//{
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// _v[0] = T(b[0]);
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// _v[1] = T(b[1]);
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// _v[2] = T(b[2]);
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// _v[3] = T(b[3]);
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//}
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//
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inline Color4<unsigned char>::Color4<unsigned char>(Color4<unsigned char>::ColorConstant cc)
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{
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*((int *)this )= cc;
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}
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inline Color4<float>::Color4<float>(Color4<float>::ColorConstant cc)
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{
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Import(Color4<unsigned char>((Color4<unsigned char>::ColorConstant)cc));
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}
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typedef Color4<unsigned char> Color4b;
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typedef Color4<float> Color4f;
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} // end of NameSpace
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#endif |