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/*
lambda.C version 0.1.1
Copyright (C) 1997 Uwe Thiem
uwe@uwix.alt.na
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include "lambda.h"
#define DEFAULT_X 0.0
#define DEFAULT_Y 0.0
#define DEFAULT_WIDTH 4.0
#define DEFAULT_BAILOUT 4.0
Lambda::Lambda()
{
}
void Lambda::init( double center_x, double center_y,
double dx, double dy,
int x_max, int y_max,
int iter_max, double bail_out,
double param_x, double param_y )
{
Fract::init( center_x, center_y, dx, dy,
x_max, y_max, iter_max, bail_out );
lambda_x = param_x;
lambda_y = param_y;
}
int Lambda::calcPoint( int x, int y )
{
double r = x_values[x], i = y_values[y];
double r_out = r, i_out = i;
double tmp, r2 = r * r, i2 = i * i;
register int iter = 0;
while ( ( r2 + i2 < bail ) && ( iter < max_iter ) )
{
tmp = 2.0 * r_out * i_out + julia_x;
// This is sort of sneaky because we actually compare the values of the
// last iteration to bailout. But the results are very close to those of
// the correct way and it's significantly faster.
r_out = ( r2 = r_out * r_out ) - ( i2 = i_out * i_out ) + julia_y;
i_out = tmp;
iter++;
}
return iter;
}
double Lambda::defaultCenterX()
{
return DEFAULT_X;
}
double Lambda::defaultCenterY()
{
return DEFAULT_Y;
}
double Lambda::defaultWidth()
{
return DEFAULT_WIDTH;
}
double Lambda::defaultBailout()
{
return DEFAULT_BAILOUT;
}
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