## File: sp2_color.c

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garlic 1.6-3
 `123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194` ``````/* Copyright (C) 2000-2002 Damir Zucic */ /*============================================================================= sp2_color.c Purpose: Prepare spacefill color, version 2. In this function white, left, middle, right and black color are used. Input: (1) Pointer to AtomS structure. (2) Pointer to GUIS structure. (3) Cosine of the angle between the vector from sphere center and the current pixel and the light source unit vector. It will be used to calculate the angle. Output: (1) Return value. Return value: The pixel (color) value. Notes: (1) This function may be quite slow (a lot of math). =============================================================================*/ #include #include #include #include #include #include #include "defines.h" #include "typedefs.h" /*======spacefill color:=====================================================*/ unsigned long Sp2Color_ (AtomS *curr_atomSP, GUIS *guiSP, double cos_angle) { static long double angle; static long double angle1 = 10.0, angle2 = 40.0; static long double angle3 = 80.0, angle4 = 130.0; static long double delta_angle; static long double w0 = 0.100000, w1 = 0.033333; static long double w2 = 0.025000, w3 = 0.020000; static unsigned long colorID; static unsigned long red_mask, green_mask, blue_mask; static unsigned long red1, red2, red; static unsigned long green1, green2, green; static unsigned long blue1, blue2, blue; static long double r1, r2, g1, g2, b1, b2; static long double r, g, b; /* Calculate the angle, in degrees: */ if (cos_angle <= -1.0) angle = 180.0; else if (cos_angle >= 1.0) angle = 0.0; else angle = RAD_TO_DEG * acos (cos_angle); /* Copy masks: */ red_mask = guiSP->visual_infoS.red_mask; green_mask = guiSP->visual_infoS.green_mask; blue_mask = guiSP->visual_infoS.blue_mask; /* Find sector and prepare color components: */ if (angle >= angle4) { return (guiSP->black_colorID); } else if (angle >= angle3) { /* Extract input color components: */ red1 = curr_atomSP->right_colorID & red_mask; red2 = guiSP->black_colorID & red_mask; green1 = curr_atomSP->right_colorID & green_mask; green2 = guiSP->black_colorID & green_mask; blue1 = curr_atomSP->right_colorID & blue_mask; blue2 = guiSP->black_colorID & blue_mask; /* Convert to doubles: */ r1 = (long double) red1; r2 = (long double) red2; g1 = (long double) green1; g2 = (long double) green2; b1 = (long double) blue1; b2 = (long double) blue2; /* Calculate new color components: */ delta_angle = angle - angle3; r = r1 + w3 * (r2 - r1) * delta_angle; g = g1 + w3 * (g2 - g1) * delta_angle; b = b1 + w3 * (b2 - b1) * delta_angle; } else if (angle >= angle2) { /* Extract input color components: */ red1 = curr_atomSP->middle_colorID & red_mask; red2 = curr_atomSP->right_colorID & red_mask; green1 = curr_atomSP->middle_colorID & green_mask; green2 = curr_atomSP->right_colorID & green_mask; blue1 = curr_atomSP->middle_colorID & blue_mask; blue2 = curr_atomSP->right_colorID & blue_mask; /* Convert to doubles: */ r1 = (long double) red1; r2 = (long double) red2; g1 = (long double) green1; g2 = (long double) green2; b1 = (long double) blue1; b2 = (long double) blue2; /* Calculate new color components: */ delta_angle = angle - angle2; r = r1 + w2 * (r2 - r1) * delta_angle; g = g1 + w2 * (g2 - g1) * delta_angle; b = b1 + w2 * (b2 - b1) * delta_angle; } else if (angle >= angle1) { /* Extract input color components: */ red1 = curr_atomSP->left_colorID & red_mask; red2 = curr_atomSP->middle_colorID & red_mask; green1 = curr_atomSP->left_colorID & green_mask; green2 = curr_atomSP->middle_colorID & green_mask; blue1 = curr_atomSP->left_colorID & blue_mask; blue2 = curr_atomSP->middle_colorID & blue_mask; /* Convert to doubles: */ r1 = (long double) red1; r2 = (long double) red2; g1 = (long double) green1; g2 = (long double) green2; b1 = (long double) blue1; b2 = (long double) blue2; /* Calculate new color components: */ delta_angle = angle - angle1; r = r1 + w1 * (r2 - r1) * delta_angle; g = g1 + w1 * (g2 - g1) * delta_angle; b = b1 + w1 * (b2 - b1) * delta_angle; } else { /* Extract input color components: */ red1 = guiSP->white_colorID & red_mask; red2 = curr_atomSP->left_colorID & red_mask; green1 = guiSP->white_colorID & green_mask; green2 = curr_atomSP->left_colorID & green_mask; blue1 = guiSP->white_colorID & blue_mask; blue2 = curr_atomSP->left_colorID & blue_mask; /* Convert to doubles: */ r1 = (long double) red1; r2 = (long double) red2; g1 = (long double) green1; g2 = (long double) green2; b1 = (long double) blue1; b2 = (long double) blue2; /* Calculate new color components: */ delta_angle = angle; r = r1 + w0 * (r2 - r1) * delta_angle; g = g1 + w0 * (g2 - g1) * delta_angle; b = b1 + w0 * (b2 - b1) * delta_angle; } /* Check new color components: */ if (r < 0.0) r = 0.0; if (g < 0.0) g = 0.0; if (b < 0.0) b = 0.0; /* Convert new color components: */ red = ((unsigned long) r) & red_mask; green = ((unsigned long) g) & green_mask; blue = ((unsigned long) b) & blue_mask; /* Combine new color components: */ colorID = red | green | blue; /* Return the pixel value: */ return colorID; } /*===========================================================================*/ ``````