题意：给你三种颜色表示模式，RGB,HSV和HSL，实现任意模式之间两两转化。
1.最好别看题目中给的转化公式描述，我觉得叙述的一点也不清楚，看*，把*上的公式一句一句翻译过来就好
2.在公式换算的时候，全部转成小数形式。例如：RGB的取值范围0-255转化成0-1, 即r = R/255.0, g = G/255.0 b = B/255.0……
3.HSL->RGB和HSV->RGB需要四舍五入，而HSV和HSL之间的互相转化需要通过RGB: HSV<=>RGB<=>HSL，这里转RGB的时候不需要四舍五入。
4.对于自己转自己的情况，例如RGB->RGB，直接原样输出。
写的时候脑子不是很清楚，加上WA之后各种瞎改，代码略丑= =凑合着看吧……
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <cmath>
#include <algorithm> using namespace std; const double eps = 1e-; struct node
{
int val[];
bool second;
double ang[];
}; char tar[];
char ori[];
node A, ans; int dcmp( double a )
{
if ( fabs(a) < eps ) return ;
return a < ? - : ;
} int Round( double a )
{
return (int)(a + 0.5);
} void init()
{
scanf( "%s", ori );
//printf("A: ");
char tmp[];
for ( int i = ; i < ; ++i )
{
scanf( "%s", tmp );
sscanf( tmp, "%d", &A.val[i] );
//printf( "%d ", A.val[i] );
}
A.second = false;
//puts("");
return;
} void RGBtoHSL()
{
double r, g, b;
if ( A.second )
{
r = A.ang[];
g = A.ang[];
b = A.ang[];
}
else
{
r = A.val[]/255.0;
g = A.val[]/255.0;
b = A.val[]/255.0;
} double h, l, s; //printf( "rgb: %f %f %f\n", r, g, b );
double maxi = max( max(r, g), b );
double mini = min( min(r, g), b ); double delta = maxi - mini;
if ( dcmp( maxi - mini ) == )
{
h = 0.0;
}
else if ( dcmp( maxi - r ) == )
{
if ( dcmp( g - b ) >= )
{
h = 60.0*(g-b)/delta+;
}
else
{
h = 60.0*(g-b)/delta+;
}
}
else if ( dcmp( maxi - g ) == )
{
h = 60.0*(b-r)/delta+;
}
else if ( dcmp( maxi - b ) == )
{
h = 60.0*(r-g)/delta+;
} l = 0.5*(maxi+mini);
//printf("l:%f\n", l); if ( dcmp(l) == || dcmp( delta ) == )
{
s = 0.0;
}
else if ( dcmp(l) > && dcmp( 0.5 - l ) >= )
{
s = delta/(maxi+mini);
}
else
{
s = delta/(2.0-(maxi+mini));
} //printf( "%s ", tar );
//printf("%.0f %.0f%% %.0f%%\n", h+eps, s*100+eps, l*100+eps );
//printf("%d %d%% %d%%\n", Round(h+eps), Round(s*100+eps), Round(l*100+eps) );
ans.val[] = Round(h);
ans.val[] = Round(s*);
ans.val[] = Round(l*);
return;
} void RGBtoHSV()
{
double r, g, b;
if ( A.second )
{
r = A.ang[];
g = A.ang[];
b = A.ang[];
}
else
{
r = A.val[]/255.0;
g = A.val[]/255.0;
b = A.val[]/255.0;
} double h, v, s; double maxi = max( max(r, g), b );
double mini = min( min(r, g), b ); double delta = maxi - mini;
if ( dcmp( delta ) == )
{
h = ;
}
else if ( dcmp( maxi - r ) == )
{
if ( dcmp( g - b ) >= )
{
h = 60.0*(g-b)/delta+;
}
else
{
h = 60.0*(g-b)/delta+;
}
}
else if ( dcmp( maxi - g ) == )
{
h = 60.0*(b-r)/delta+;
}
else if ( dcmp( maxi - b ) == )
{
h = 60.0*(r-g)/delta+;
} if ( dcmp( maxi ) == )
{
s = ;
}
else s = (double)(maxi-mini)/maxi; v = maxi; //printf( "%s ", tar );
//printf("%f %f %f\n", h+eps, s*100+eps, v*100+eps );
//printf("%d %d%% %d%%\n", Round(h+eps), Round(s*100+eps), Round(v*100+eps) );
ans.val[] = Round(h);
ans.val[] = Round(s*);
ans.val[] = Round(v*); return;
} void jiuzheng( double &tC )
{
if ( dcmp( tC ) < ) tC += 1.0;
if ( dcmp( tC - 1.0 ) > ) tC -= 1.0;
return;
} double GetRGB( double p, double q, double tC )
{
if ( dcmp( 1.0/6.0 - tC ) > )
{
return p + ( (q - p) * 6.0 * tC );
}
else if ( dcmp( 0.5 - tC ) > )
{
return q;
}
else if ( dcmp( 2.0/3.0 - tC ) > )
{
return p + ( (q-p)*4.0 - (q-p)*6.0*tC );
}
else return p;
} void HSLtoRGB()
{
double h, s, l;
double r, g, b;
//int R, G, B; h = A.val[]/360.0;
s = A.val[]/100.0;
l = A.val[]/100.0; if ( dcmp(s) == )
{
r = l;
g = l;
b = l;
}
else
{
double p, q, tR, tG, tB; if ( dcmp( 0.5 - l ) > )
q = l * ( 1.0 + s );
else q = l + s - ( l * s ); p = * l - q; tR = h + 1.0/3.0;
tG = h;
tB = h - 1.0/3.0; jiuzheng( tR );
jiuzheng( tG );
jiuzheng( tB ); //r = GetRGB( p, q, tR )*255.0;
r = GetRGB( p, q, tR );
//g = GetRGB( p, q, tG )*255.0;
g = GetRGB( p, q, tG );
//b = GetRGB( p, q, tB )*255.0;
b = GetRGB( p, q, tB );
} //printf( "%s ", tar );
//printf( "RGB: %d %d %d\n", r, g, b );
A.ang[] = r;
A.ang[] = g;
A.ang[] = b;
A.val[] = Round( r * );
A.val[] = Round( g * );
A.val[] = Round( b * );
//printf("HSLtoRGB: %d %d %d\n", A.val[0], A.val[1], A.val[2] );
for ( int i = ; i < ; ++i )
ans.val[i] = A.val[i]; return;
} void HSVtoRGB()
{
double h, s, v;
int R, G, B;
double r, g, b; h = A.val[];
s = A.val[] / 100.0;
v = A.val[] / 100.0; if ( dcmp(s) == )
{
r = g = b = v;
}
else
{
int hi = (int)floor(h/);
double f = h / - hi;
double p = v * ( - s );
double q = v * ( - f*s );
double t = v * ( - (-f)*s ); switch( hi )
{
case : r = v, g = t, b = p; break;
case : r = q, g = v, b = p; break;
case : r = p, g = v, b = t; break;
case : r = p, g = q, b = v; break;
case : r = t, g = p, b = v; break;
case : r = v, g = p, b = q; break;
}
} R = Round( r * 255.0 );
G = Round( g * 255.0 );
B = Round( b * 255.0 ); //printf( "%s ", tar );
//printf( "%d %d %d\n", R, G, B );
A.ang[] = r;
A.ang[] = g;
A.ang[] = b; A.val[] = R;
A.val[] = G;
A.val[] = B;
for ( int i = ; i < ; ++i )
ans.val[i] = A.val[i];
return;
} void HSVtoHSL()
{
HSVtoRGB();
A.second = true;
RGBtoHSL();
return;
} void HSLtoHSV()
{
HSLtoRGB();
A.second = true;
RGBtoHSV();
return;
} int main()
{
while ( scanf( "%s", tar ) == )
{
init();
if ( ori[] == 'R' )
{
if ( tar[] == 'L' ) RGBtoHSL();
else if ( tar[] == 'R' )
{
for ( int i = ; i < ; ++i )
ans.val[i] = A.val[i];
}
else RGBtoHSV();
}
else if ( ori[] == 'L' )
{
if ( tar[] == 'R' ) HSLtoRGB();
else if ( tar[] == 'L' )
{
for ( int i = ; i < ; ++i )
ans.val[i] = A.val[i];
}
else HSLtoHSV();
}
else
{
if ( tar[] == 'R' ) HSVtoRGB();
else if ( tar[] == 'V' )
{
for ( int i = ; i < ; ++i )
ans.val[i] = A.val[i];
}
else HSVtoHSL();
} printf( "%s ", tar );
if ( tar[] == 'R' )
{
printf( "%d %d %d\n", ans.val[], ans.val[], ans.val[] );
}
else printf( "%d %d%% %d%%\n", ans.val[], ans.val[], ans.val[] );
}
return ;
}