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Versions: 19
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Contents
/*
# Copyright 2014 Ball Aerospace & Technologies Corp.
# All Rights Reserved.
#
# This program is free software; you can modify and/or redistribute it
# under the terms of the GNU General Public License
# as published by the Free Software Foundation; version 3 with
# attribution addendums as found in the LICENSE.txt
*/
#include "ruby.h"
#include "stdio.h"
#include "math.h"
#ifndef RFLOAT_VALUE
#define RFLOAT_VALUE(v) (RFLOAT(v)->value)
#endif
VALUE mCosmos;
VALUE cConversion;
VALUE cPolynomialConversion;
static ID id_ivar_coeffs = 0;
static ID id_method_to_f = 0;
/*
* Calling this method performs a polynomial conversion on the given value.
*
* conversion.call(1, packet) #=> 2.5
*/
static VALUE polynomial_conversion_call(VALUE self, VALUE value, VALUE myself, VALUE buffer)
{
VALUE coeffs = Qnil;
long coeffs_length = 0;
int index = 0;
double double_value = 0.0;
double coeff = 0.0;
double converted = 0.0;
double raised_to_power = 1.0;
coeffs = rb_ivar_get(self, id_ivar_coeffs);
coeffs_length = RARRAY_LEN(coeffs);
double_value = RFLOAT_VALUE(rb_funcall(value, id_method_to_f, 0));
/* Handle C0 */
coeff = RFLOAT_VALUE(rb_ary_entry(coeffs, 0));
converted += coeff;
/* Handle Coefficients raised to a power */
for (index = 1; index < coeffs_length; index++)
{
raised_to_power *= double_value;
coeff = RFLOAT_VALUE(rb_ary_entry(coeffs, index));
converted += (coeff * raised_to_power);
}
return rb_float_new(converted);
}
/*
* Initialize methods for PolynomialConversion
*/
void Init_polynomial_conversion (void)
{
id_ivar_coeffs = rb_intern("@coeffs");
id_method_to_f = rb_intern("to_f");
mCosmos = rb_define_module("Cosmos");
rb_require("cosmos/conversions/conversion");
cConversion = rb_const_get(mCosmos, rb_intern("Conversion"));
cPolynomialConversion = rb_define_class_under(mCosmos, "PolynomialConversion", cConversion);
rb_define_method(cPolynomialConversion, "call", polynomial_conversion_call, 3);
}
Version data entries
19 entries across 19 versions & 1 rubygems