from collections import OrderedDict import os.path try: import json except ImportError: try: import simplejson as json except ImportError: raise SystemExit('No JSON module found') try: from punyverse._model import model_list, load_model except ImportError: from punyverse.model import model_list, load_model from punyverse.glgeom import * from punyverse.entity import * from punyverse.texture import * from punyverse import texture from math import pi, sqrt G = 6.67384e-11 # Gravitation Constant def get_best_texture(info, optional=False): cheap = False skip = False texture = None if isinstance(info, list): for item in info: if isinstance(item, list): if len(item) == 4: cheap = True texture = item break continue try: texture = load_texture(item) except ValueError: pass else: break else: try: texture = load_texture(info) except ValueError: if optional: skip = True else: cheap = True texture = [1, 1, 1, 1] return cheap, skip, texture def load_world(file): with open(os.path.join(os.path.dirname(__file__), file)) as f: root = json.load(f, object_pairs_hook=OrderedDict) world = World() au = root.get('au', 2000) e = lambda x: eval(str(x), {'__builtins__': None}, {'AU': au, 'TEXTURE': texture.max_texture}) tick = root.get('tick', 4320) # How many second is a tick? length = root.get('length', 4320) # Satellite distance is in km, divide by this gets in world units world.tick_length = tick if 'start' in root: info = root['start'] x = e(info.get('x', 0)) y = e(info.get('y', 0)) z = e(info.get('z', 0)) pitch = e(info.get('pitch', 0)) yaw = e(info.get('yaw', 0)) roll = e(info.get('roll', 0)) world.start = (x, y, z) world.direction = (pitch, yaw, roll) def body(name, info, parent=None): lighting = info.get('lighting', True) x = e(info.get('x', 0)) y = e(info.get('y', 0)) z = e(info.get('z', 0)) pitch = e(info.get('pitch', 0)) yaw = e(info.get('yaw', 0)) roll = e(info.get('roll', 0)) rotation = e(info.get('rotation', 86400)) radius = e(info.get('radius', length)) / length background = info.get('background', False) orbit_distance = e(info.get('orbit_distance', au)) division = info.get('division', max(min(int(radius / 8), 60), 10)) if 'texture' in info: cheap, skip, texture = get_best_texture(info['texture'], optional=info.get('optional', False)) if skip: return if cheap: object_id = compile(colourball, radius, division, division, texture) else: object_id = compile(sphere, radius, division, division, texture, lighting=lighting) elif 'model' in info: scale = info.get('scale', 1) object_id = model_list(load_model(info['model']), info.get('sx', scale), info.get('sy', scale), info.get('sz', scale), (0, 0, 0)) else: print 'Nothing to load for %s.' % name return params = {'world': world, 'orbit_distance': orbit_distance} if parent is None: type = Body else: x, y, z = parent.location distance = e(info.get('distance', 100)) # Semi-major axis when actually displayed in virtual space sma = e(info.get('sma', distance)) # Semi-major axis used to calculate orbital speed if hasattr(parent, 'mass') and parent.mass is not None: period = 2 * pi * sqrt((sma * 1000) ** 3 / (G * parent.mass)) speed = 360 / (period + .0) if not rotation: # Rotation = 0 assumes tidal lock rotation = period else: speed = info.get('orbit_speed', 1) type = Satellite params.update(parent=parent, orbit_speed=speed, distance=distance / length, eccentricity=info.get('eccentricity', 0), inclination=info.get('inclination', 0), longitude=info.get('longitude', 0), argument=info.get('argument', 0)) if 'mass' in info: params['mass'] = info['mass'] atmosphere_id = 0 cloudmap_id = 0 corona_id = 0 if 'atmosphere' in info: atmosphere_data = info['atmosphere'] atm_size = e(atmosphere_data.get('diffuse_size', None)) atm_texture = atmosphere_data.get('diffuse_texture', None) cloud_texture = atmosphere_data.get('cloud_texture', None) corona_texture = atmosphere_data.get('corona_texture', None) if cloud_texture is not None: cheap, _, cloud_texture = get_best_texture(cloud_texture) if not cheap: cloudmap_id = compile(sphere, radius + 2, division, division, cloud_texture, lighting=False) if corona_texture is not None: cheap, _, corona = get_best_texture(corona_texture) if not cheap: corona_size = atmosphere_data.get('corona_size', radius / 2) corona_division = atmosphere_data.get('corona_division', 100) corona_ratio = atmosphere_data.get('corona_ratio', 0.5) corona_id = compile(flare, radius, radius + corona_size, corona_division, corona_ratio, corona) if atm_texture is not None: cheap, _, atm_texture = get_best_texture(atm_texture) if not cheap: atmosphere_id = compile(disk, radius, radius + atm_size, 30, atm_texture) theta = 360 / (rotation + .0) if rotation else 0 object = type(object_id, (x, y, z), (pitch, yaw, roll), rotation_angle=theta, atmosphere=atmosphere_id, cloudmap=cloudmap_id, background=background, corona=corona_id, **params) world.tracker.append(object) if 'ring' in info: ring_data = info['ring'] texture = ring_data.get('texture', None) distance = e(ring_data.get('distance', radius * 1.2)) size = e(ring_data.get('size', radius / 2)) pitch = e(ring_data.get('pitch', pitch)) yaw = e(ring_data.get('yaw', yaw)) roll = e(ring_data.get('roll', roll)) cheap, _, texture = get_best_texture(texture) if not cheap: world.tracker.append( type(compile(disk, distance, distance + size, 30, texture), (x, y, z), (pitch, yaw, roll), **params)) for satellite, info in info.get('satellites', {}).iteritems(): print 'Loading %s, satellite of %s.' % (satellite, name) body(satellite, info, object) for planet, info in root['bodies'].iteritems(): print 'Loading %s.' % planet body(planet, info) for name, info in root['belts'].iteritems(): print 'Loading %s.' % name x = e(info.get('x', 0)) y = e(info.get('y', 0)) z = e(info.get('z', 0)) radius = e(info.get('radius', 0)) cross = e(info.get('cross', 0)) count = int(e(info.get('count', 0))) scale = info.get('scale', 1) longitude = info.get('longitude', 0) inclination = info.get('inclination', 0) argument = info.get('argument', 0) rotation = info.get('period', 31536000) theta = 360 / (rotation + .0) if rotation else 0 object_id = model_list(load_model(info['model']), info.get('sx', scale), info.get('sy', scale), info.get('sz', scale), (0, 0, 0)) world.tracker.append(Belt(compile(belt, radius, cross, object_id, count), (x, y, z), (inclination, longitude, argument), rotation_angle=theta, world=world)) return world class World(object): def __init__(self): self.tracker = [] self.start = (0, 0, 0) self.direction = (0, 0, 0) self.x = None self.y = None self.z = None self.tick_length = 1 self.tick = 0