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# back_ground_demo.py
# Copyright (C) 2006 Bernhard Lohkamp
# Copyright (C) 2006 Paul Emsley, The University of York
#
# 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 3 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, see <http://www.gnu.org/licenses/>.
#;; A silly (but somewhat amusing) demo that changes the background colour
#;; over a range of colours.
#;;
#;; The scene is spun too, for extra eye-candy (so have a molecule
#;; loaded before you run this).
#;;
#;; What's the point? It's to show that we can display the result of
#;; an arbitarily complex computation, i.e, we have a real extension
#;; language, not just a list of commands (like some other molecular
#;; graphics programs).
# n-steps is divided into 3 sets:
n_steps = 300.0
# flash the background different colours in some uninteresting way.
def background_demo():
def rgb_colours(nlocal):
r_step = 1 / n_steps
red = 0.0
green =0.0
blue = 0.0
if (n_local < (n_steps / 3)):
red = 3 * r_step * n_local
green = 0.0
elif (n_local < ((2 * n_steps) / 3)):
red = 1 - ((n_local - (n_steps / 3)) * 3 * r_step)
green = ((n_local - (n_steps / 3)) * 3 * r_step)
else:
red = 0.0
green = 1 - (n_local - ((n_steps / 3) * 2)) * 3 * r_step
return red,green,blue
n_local = 1.0
while (n_local<=n_steps):
r_col = rgb_colours(n_local)
coot.set_background_colour(r_col[0],r_col[1],r_col[2])
coot.rotate_y_scene(10,0.1) # n-frames frame-interval(degrees)
n_local = n_local + 1.0
background_demo()
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