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/* Copyright (C) 2000 Damir Zucic */
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/*=============================================================================
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Draw bond which fits into quadrant 1 using style 1. See the file
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file bonds_style1.c for description of quadrants.
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(1) Pointer to Aux1S structure, which contains required data.
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(1) A single bond drawn.
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(1) One if at least one pixel is drawn.
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=============================================================================*/
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#include <X11/Xutil.h>
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#include <X11/Xatom.h>
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/*======draw bond in quadrant 1 using style 1:===============================*/
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int BondStyle1Quadrant1_ (Aux1S *aux1SP)
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long pixels_drawnN = 0;
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double recip_denom, x_to_y_scale, x_to_z_scale;
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int screen_x, screen_x1, delta_x, screen_y;
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NearestAtomS *curr_pixelSP;
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/* Scale factor required to calculate screen_y from screen_x: */
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if (aux1SP->screen_delta_x != 0) recip_denom = 1.0 / aux1SP->screen_delta_x;
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else recip_denom = 0.0;
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x_to_y_scale = aux1SP->screen_delta_y * recip_denom;
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/* Scale factor required to calculate z (in atomic units) from screen_x: */
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x_to_z_scale = aux1SP->atomic_delta_z * recip_denom;
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/* Horizontal scan, from left to right: */
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screen_x1 = aux1SP->screen_x0 + (aux1SP->screen_delta_x + 1) / 2;
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for (screen_x = aux1SP->screen_x0; screen_x <= screen_x1; screen_x++)
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/* Check is this pixel inside the area reserved for the */
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/* current image (there are two images in stereo mode): */
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if (screen_x < aux1SP->configSP->image_screen_x0[aux1SP->imageI])
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if (screen_x > aux1SP->configSP->image_screen_x1[aux1SP->imageI])
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/* Relative position: */
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delta_x = screen_x - aux1SP->screen_x0;
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/* Find the corresponding screen_y: */
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d = aux1SP->screen_y0 + x_to_y_scale * delta_x;
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screen_y = (int) (d + 0.5);
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/* Check is this pixel inside the area reserved for the */
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/* current image (there are two images in stereo mode): */
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if (screen_y < aux1SP->configSP->image_screen_y0) continue;
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if (screen_y > aux1SP->configSP->image_screen_y1) continue;
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/* z value (in atomic units): */
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atomic_z = aux1SP->atomic_z0 + x_to_z_scale * delta_x;
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/* Current pixel index: */
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pixelI = aux1SP->guiSP->main_win_free_area_width * screen_y + screen_x;
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/* Check pixel index: */
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if (pixelI >= aux1SP->pixelsN) break;
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/* Pointer to NearestAtomS struct. */
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/* assigned to current coordinates: */
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curr_pixelSP = aux1SP->nearest_atomSP + pixelI;
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/* Check was this pixel used already in */
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/* this drawing step; if it was, compare */
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/* the z value of the current atom with z */
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/* value previously stored to this pixel: */
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if (aux1SP->refreshI == curr_pixelSP->last_refreshI)
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if (atomic_z >= curr_pixelSP->z) continue;
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/* If this point is reached, draw the pixel: */
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XDrawPoint (aux1SP->guiSP->displaySP,
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aux1SP->guiSP->main_hidden_pixmapID,
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aux1SP->guiSP->theGCA[0],
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/* Refresh the content of NearestAtomS */
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/* array associated with this pixel: */
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curr_pixelSP->styleI = 1;
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curr_pixelSP->last_refreshI = aux1SP->refreshI;
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curr_pixelSP->mol_complexI = aux1SP->mol_complexI;
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curr_pixelSP->atomI = aux1SP->atomI;
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curr_pixelSP->z = atomic_z;
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curr_pixelSP->colorID = aux1SP->colorIDA[0];
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/* Update the number of pixels drawn: */
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/* Check is at least one pixel drawn: */
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if (pixels_drawnN > 0) return 1;
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/* If this point is reached, nothing is drawn: */
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/*===========================================================================*/
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bond_style1_quad1.c
