+# ifdef LINEAR
+ {
+ static double i = 0.0;
+ dc->anim_state = HELIX;
+ dc->wire_overlay = 0;
+ dc->gasket_spinnerx.spinning_p = 0;
+ dc->gasket_spinnery.spinning_p = 0;
+ dc->gasket_spinnerz.spinning_p = 0;
+ dc->helix_spinnerz.spinning_p = 0;
+ dc->pizza_spinnery.spinning_p = 0;
+ dc->pizza_spinnerz.spinning_p = 0;
+ dc->scene_spinnerx.spinning_p = 0;
+ dc->scene_spinnery.spinning_p = 0;
+ dc->frame_spinner.spinning_p = 0;
+ dc->frame_spinner.position = 0.3;
+ dc->gasket_spinnerz.position = i;
+ dc->helix_spinnerz.position = i;
+ i += 0.005;
+ if (i > 1) i = 0;
+ }
+# endif /* LINEAR */
+
+ switch (dc->anim_state)
+ {
+ case HELIX:
+ if (dc->mode == BOTH &&
+ (random() % (int) (PROBABILITY_SCALE / 0.2)) == 0)
+ dc->anim_state = HELIX_OUT;
+ break;
+
+ case HELIX_OUT:
+ dc->anim_ratio += 0.1 * dc->speed;
+ if (dc->anim_ratio >= 1.0)
+ {
+ dc->anim_ratio = 0.0;
+ dc->anim_state = PIZZA_IN;
+ }
+ break;
+
+ case PIZZA_IN:
+ dc->anim_ratio += 0.1 * dc->speed;
+ if (dc->anim_ratio >= 1.0)
+ {
+ dc->anim_ratio = 0.0;
+ dc->anim_state = PIZZA;
+ }
+ break;
+
+ case PIZZA:
+ if (dc->mode == BOTH &&
+ (random() % (int) (PROBABILITY_SCALE / 0.2)) == 0)
+ dc->anim_state = PIZZA_OUT;
+ break;
+
+ case PIZZA_OUT:
+ dc->anim_ratio += 0.1 * dc->speed;
+ if (dc->anim_ratio >= 1.0)
+ {
+ dc->anim_ratio = 0.0;
+ dc->anim_state = HELIX_IN;
+ }
+ break;
+
+ case HELIX_IN:
+ dc->anim_ratio += 0.1 * dc->speed;
+ if (dc->anim_ratio >= 1.0)
+ {
+ dc->anim_ratio = 0.0;
+ dc->anim_state = HELIX;
+ }
+ break;
+
+ default:
+ abort();
+ break;
+ }
+
+ pizza_p = (dc->anim_state == PIZZA ||
+ dc->anim_state == PIZZA_IN ||
+ dc->anim_state == PIZZA_OUT);
+