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/* Copyright (C) 2000, 2001 Damir Zucic */
/*=============================================================================
project_planes.c
Purpose:
For each macromolecular complex, project plane to the screen.
The plane is represented by a circle in space, which projects
into an ellipse. The plane is projected always, even if not
visible. This function prepares only parameters which are kept
in PlaneS structure, associated with a given macromolecular
complex. Other parameters will be prepared in a function which
draws plane to the screen.
Input:
(1) Pointer to MolComplexS structure, with macromol. complexes.
(2) Number of macromolecular complexes.
(3) Pointer to ConfigS structure, with configuration data.
Output:
(1) Parameters which define plane projection to the screen will
be calculated for each macromolecular complex containing at
least one atom.
Return value:
No return value.
========includes:============================================================*/
#include <stdio.h>
#include <limits.h>
#include <math.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xos.h>
#include <X11/Xatom.h>
#include "defines.h"
#include "typedefs.h"
/*======project planes:=======================================================*/
void ProjectPlanes_ (MolComplexS *mol_complexSP, int mol_complexesN,
ConfigS *configSP)
{
double nominator_x, nominator_y, user_atomic_position;
int center_screen_x[2], center_screen_y;
int mol_complexI;
MolComplexS *curr_mol_complexSP;
PlaneS *curr_planeSP;
int imagesN, imageI;
double denominator, reciprocal_denominator;
double normal_x, normal_y, normal_z;
double rationalized_x, rationalized_y;
double scalar_product, abs_value_squared, abs_value;
double cos_theta, cos_phi, angle;
double value1, value2;
/* The number of images (1 for mono, 2 for stereo): */
if (configSP->stereoF == 1) imagesN = 2;
else imagesN = 1;
/* Prepare the factors which are used to */
/* reduce the number of multiplications: */
nominator_x = configSP->user_screen_atomic_distance *
configSP->atomic_to_screen_scale_x;
nominator_y = configSP->user_screen_atomic_distance *
configSP->atomic_to_screen_scale_y;
/* Prepare the user position in atomic coordinates: */
user_atomic_position = configSP->user_atomic_position;
/* Position of the window free area center (stereo data): */
center_screen_x[0] = configSP->center_screen_x[0];
center_screen_x[1] = configSP->center_screen_x[1];
center_screen_y = configSP->center_screen_y;
/* Project plane for each macromolecular complex: */
for (mol_complexI = 0; mol_complexI < mol_complexesN; mol_complexI++)
{
/* Pointer to the current macromolecular complex: */
curr_mol_complexSP = mol_complexSP + mol_complexI;
/* If this complex contains no atoms, ignore it: */
if (curr_mol_complexSP->atomsN == 0) continue;
/* Projection is not necessary if the position is unchanged: */
if (curr_mol_complexSP->position_changedF == 0) continue;
/* Pointer to the current plane: */
curr_planeSP = &curr_mol_complexSP->planeS;
/* Stereo data should be prepared: */
for (imageI = 0; imageI < imagesN; imageI++)
{
/*------prepare auxilliary parameters:-----------------------*/
denominator = curr_planeSP->center_z[imageI] -
user_atomic_position;
if (denominator == 0.0) reciprocal_denominator = 0.0;
else reciprocal_denominator = 1.0 / denominator;
normal_x = curr_planeSP->normal_x[imageI];
normal_y = curr_planeSP->normal_y;
normal_z = curr_planeSP->normal_z[imageI];
/*------project plane center to the screen:------------------*/
/* Prepare rationalized coordinates: */
rationalized_x = curr_planeSP->center_x[imageI] *
nominator_x * reciprocal_denominator;
rationalized_y = curr_planeSP->center_y *
nominator_y * reciprocal_denominator;
/* Keep them in a reasonable range: */
if (rationalized_x > (double) INT_MAX / 4)
rationalized_x = (double) INT_MAX / 4;
else if (rationalized_x < (double) INT_MIN / 4)
rationalized_x = (double) INT_MIN / 4;
if (rationalized_y > (double) INT_MAX / 4)
rationalized_y = (double) INT_MAX / 4;
else if (rationalized_y < (double) INT_MIN / 4)
rationalized_y = (double) INT_MIN / 4;
/* Prepare screen coordinates of the plane center: */
curr_planeSP->center_screen_x[imageI] =
(int) rationalized_x + center_screen_x[imageI];
curr_planeSP->center_screen_y =
(int) rationalized_y + center_screen_y;
/*------angle between normal vector and z axis:--------------*/
scalar_product = normal_z;
abs_value_squared = normal_x * normal_x +
normal_y * normal_y +
normal_z * normal_z;
abs_value = sqrt (abs_value_squared);
if (abs_value == 0.0)
{
cos_theta = 0.0;
curr_planeSP->normal_theta[imageI] = 1.5707963;
}
else
{
cos_theta = scalar_product / abs_value;
if (cos_theta <= -1.0) angle = 3.1415927;
else if (cos_theta >= 1.0) angle = 0.0;
else angle = acos (cos_theta);
curr_planeSP->normal_theta[imageI] = angle;
}
/*------visible side index (0 = top, 1 = bottom):------------*/
if (cos_theta <= 0.0) curr_planeSP->visible_sideI[imageI] = 0;
else curr_planeSP->visible_sideI[imageI] = 1;
/*------angle between x and project. of n. v. to xy plane:---*/
/* Prepare and check the cosine of normal_phi: */
abs_value = sqrt (normal_x * normal_x + normal_y * normal_y);
cos_phi = normal_x / abs_value;
if (cos_phi > 1.0) cos_phi = 1.0;
if (cos_phi < -1.0) cos_phi = -1.0;
/* The special case (undefined phi): */
if ((normal_x == 0.0) && (normal_y == 0.0))
{
curr_planeSP->normal_phi[imageI] = 0.0;
}
/* If y component of the normal vector is positive: */
else if (normal_y >= 0.0)
{
if (cos_phi <= -1.0) angle = 3.1415927;
else if (cos_phi >= 1.0) angle = 0.0;
else angle = acos (cos_phi);
curr_planeSP->normal_phi[imageI] = angle;
}
/* If y component of the normal vector is negative: */
else
{
if (cos_phi <= -1.0) angle = 3.1415927;
else if (cos_phi >= 1.0) angle = 0.0;
else angle = acos (cos_phi);
curr_planeSP->normal_phi[imageI] = 6.2831853 - angle;
}
/*------large half axis of the ellipse in screen units:------*/
value1 = curr_planeSP->circle_radius *
nominator_x *
reciprocal_denominator;
value2 = curr_planeSP->circle_radius *
nominator_y *
reciprocal_denominator;
if (value1 > value2) curr_planeSP->screen_a = value1;
else curr_planeSP->screen_a = value2;
/*------small half axis of the ellipse (stereo data):--------*/
curr_planeSP->screen_b[imageI] = curr_planeSP->screen_a *
fabs (cos_theta);
/* The minimal value should be one: */
if (curr_planeSP->screen_b[imageI] < 1.0)
curr_planeSP->screen_b[imageI] = 1.0;
}
}
}
/*===========================================================================*/
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