c_geometry.h

矩量法仿真电磁辐射和散射的源代码（c++）

/*
	Copyright (C) 2004-2005  Timothy C.A. Molteno
	
	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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/
#ifndef __c_geometry__
#define __c_geometry__
#include "math_util.h"
#include <vector>
#include <iostream>

/* Replaces the "10000" limit used to */
/* identify segment/patch connections */
#define	PCHCON  100000

class nec_context;
#include "nec_output.h"



/**! \brief Use of the c_geometry class.
	
		c_geometry g = new c_geometry();
		g.parse_geometry(file);
		
	OR
	
		c_geometry g = new c_geometry();
		g.wire(xxxxxxx);
		g.arc();
		...
		g.geometry_complete();		

*/
class c_geometry
{
public:
	c_geometry();
	void set_context(nec_context* m_context);
	
	
	void wire( 	int tag_id, int segment_count,
			nec_float xw1, nec_float yw1, nec_float zw1,	// first co-ordinate
			nec_float xw2, nec_float yw2, nec_float zw2,	// second co-ordinate
			nec_float rad,					// wire radius (=0 if tapered)
			nec_float rdel, nec_float rrad);		// set to 1.0 if not tapered
			
			
	void arc( int tag_id, int segment_count, nec_float rada,
			nec_float ang1, nec_float ang2, nec_float rad );
			
	void helix( nec_float s, nec_float hl, nec_float a1, nec_float b1,
			nec_float a2, nec_float b2, nec_float rad, int segment_count, int tag_id );
	
	void move( nec_float rox, nec_float roy, nec_float roz, nec_float xs,
			nec_float ys, nec_float zs, int its, int nrpt, int itgi );

	void reflect( int ix, int iy, int iz, int itx, int nop );

	void patch( int nx, int ny,
			nec_float ax1, nec_float ay1, nec_float az1,
			nec_float ax2, nec_float ay2, nec_float az2,
			nec_float ax3, nec_float ay3, nec_float az3,
			nec_float ax4, nec_float ay4, nec_float az4 );
	
	
	/*! \brief Geometry is complete
		\exception nec_exception* If there is an error with the geometry.
	*/
	void geometry_complete(nec_context* m_context, int card_int_1, int card_int_2);
	
	
	
	/*!\brief Parse an NEC geometry description contained in the file input_fp
	*/
	void parse_geometry(nec_context* m_context, FILE* input_fp);

	
	/*!\brief Helper method to decide whether extended. thin-wire approximation can be used 
	*/
	int test_ek_approximation(int seg1, int seg2);
	
	int get_segment_number( int in_tag, int m);

	
	void frequency_scale(nec_float freq_mhz);

	void tbf( int i, int icap);
	void trio( int j );
	
	void get_current_coefficients(nec_float wavelength, complex_array& curx,
			real_array& air, real_array& aii,
			real_array& bir, real_array& bii,
			real_array& cir, real_array& cii,
			complex_array& vqds, int nqds,
			int_array& iqds);
	
	nec_float patch_angle(int patch_index, nec_float in_ax, nec_float in_ay, nec_float in_az);
	
	/*! \brief Calculate the xyz components of the electric field due to surface currents.
	*/
	void fflds(nec_float rox, nec_float roy, nec_float roz,
		complex_array& scur, 
		nec_complex *in_ex, nec_complex *in_ey, nec_complex *in_ez );
		
	int n;	// The number of segments
	int np;
	int_array segment_tags;
	real_array x, y, z, segment_length, segment_radius;
	real_array x2, y2, z2, cab, sab, salp;
	
	int m, mp;	// m is the number of patches?
	int m_ipsym;
	
	real_array t1x, t1y, t1z, t2x, t2y, t2z;	// t1, t2 basis co-ordinates?
	real_array px, py, pz, pbi, psalp;			// patch data

	int n_plus_m, n_plus_2m, n_plus_3m; /* n+m,n+2m,n+3m */
	
	int_array icon1, icon2;
	// Connected Segment Information (was common  /segj/  in FORTRAN code)
	int jsno, nscon, maxcon; /* Max. no. connections */
	int_array jco;
	real_array ax, bx, cx;
		
private:
	//	The geometry data measured in meters is stored in these arrays
	//	and the x,y,z,si,bi arrays are then scaled for each frequency
	real_array x_unscaled, y_unscaled, z_unscaled, si_unscaled, bi_unscaled;
	real_array px_unscaled, py_unscaled, pz_unscaled, pbi_unscaled;
	
	void sbf( int i, int is, nec_float *aa, nec_float *bb, nec_float *cc );

	void divide_patch( int nx );

	void connect_segments( int ignd );

	void read_geometry_card(FILE* input_fp, char *gm,
		int *i1, int *i2, 
		nec_float *x1, nec_float *y1,nec_float *z1,
		nec_float *x2, nec_float *y2, nec_float *z2, 
		nec_float *rad );

	nec_context* m_context;
	nec_output_file* m_output;
};




#endif /* __c_geometry__ */