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# -*- indent-tabs-mode: t -*-
# Soya 3D tutorial
# Copyright (C) 2004 Jean-Baptiste LAMY
#
# 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 2 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, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
# basic-5: Event management : a keyboard-controlled caterpillar
# In this lesson, our caterpillar will obey you !
# You'll learn how to use SDL events with Soya.
# Use the cursor arrows to control the caterpillar.
# Import the Soya module.
# The soya.sdlconst module contains all the SDL constants.
import sys, os, os.path, soya, soya.sdlconst
soya.init()
soya.path.append(os.path.join(os.path.dirname(sys.argv[0]), "data"))
# Creates a scene.
scene = soya.World()
# The CaterpillarHead class is very similar to the CaterpillarHead class of the previous
# lesson.
class CaterpillarHead(soya.Volume):
def __init__(self, parent):
soya.Volume.__init__(self, parent, soya.Shape.get("caterpillar_head"))
self.speed = soya.Vector(self, 0.0, 0.0, 0.0)
self.rotation_y_speed = 0.0
def begin_round(self):
soya.Volume.begin_round(self)
# Loops over all Soya / SDL events.
# Each event is a tuple ; the first value indicates the event type and the other
# values depend on the type. The following event types exist :
# - (KEYDOWN, keysym, modifier) where keysym is the key's code (a K_* constant)
# and modifier is a flag combining some of the MOD_* constant (to test the presence
# of a modifier, do e.g. for left shift: modifier & soya.sdlconst.MOD_LSHIFT).
# - (KEYUP, keysym, modifier)
# - (MOUSEMOTION, x, y, xrel, yrel) where x and y are the mouse coordinates (in
# pixel) ; xrel and yrel are the relative mouse coordinates (the difference since
# next mouse motion event).
# - (MOUSEBUTTONDOWN, button, x, y) where button is the mouse button number and
# x and y are the mouse coordinates. Mouse buttons are :
# - 1 : left
# - 2 : middle
# - 3 : right
# - 4 : roll up
# - 5 : roll down
# - (MOUSEBUTTONUP, button, x, y)
# - (JOYAXISMOTION, axis, value) XXX
# - (JOYBUTTONDOWN, button) XXX
# - (VIDEORESIZE, new_width, new_height)
for event in soya.process_event():
# Checks for key down (press) events.
if event[0] == soya.sdlconst.KEYDOWN:
# The up and down arrows set the caterpillar speed to a negative or positive value.
if event[1] == soya.sdlconst.K_UP: self.speed.z = -0.2
elif event[1] == soya.sdlconst.K_DOWN: self.speed.z = 0.1
# The left and right arrow modify the rotation speed.
elif event[1] == soya.sdlconst.K_LEFT: self.rotation_y_speed = 10.0
elif event[1] == soya.sdlconst.K_RIGHT: self.rotation_y_speed = -10.0
# Pressing the escape or 'q' key will exit the idler mainloop, and thus terminate
# the program. soya.IDLER.stop() is the right way to end your application, and
# causes the Idler.idle() method to return.
elif event[1] == soya.sdlconst.K_q: soya.IDLER.stop()
elif event[1] == soya.sdlconst.K_ESCAPE: soya.IDLER.stop()
# Checks for key up (release) events.
elif event[0] == soya.sdlconst.KEYUP:
# When up or down arrows are released, the speed is set to zero.
if event[1] == soya.sdlconst.K_UP: self.speed.z = 0.0
elif event[1] == soya.sdlconst.K_DOWN: self.speed.z = 0.0
# When left or right arrows are released, the rotation speed is set to zero.
elif event[1] == soya.sdlconst.K_LEFT: self.rotation_y_speed = 0.0
elif event[1] == soya.sdlconst.K_RIGHT: self.rotation_y_speed = 0.0
elif event[0] == soya.sdlconst.QUIT:
soya.IDLER.stop()
# Do the rotation
self.rotate_y(self.rotation_y_speed)
def advance_time(self, proportion):
soya.Volume.advance_time(self, proportion)
self.add_mul_vector(proportion, self.speed)
# CaterpillarPiece hasn't changed since the previous tutorial.
class CaterpillarPiece(soya.Volume):
def __init__(self, parent, previous):
soya.Volume.__init__(self, parent, soya.Shape.get("caterpillar"))
self.previous = previous
self.speed = soya.Vector(self, 0.0, 0.0, -0.2)
def begin_round(self):
soya.Volume.begin_round(self)
self.look_at(self.previous)
if self.distance_to(self.previous) < 1.5: self.speed.z = 0.0
else: self.speed.z = -0.2
def advance_time(self, proportion):
soya.Volume.advance_time(self, proportion)
self.add_mul_vector(proportion, self.speed)
# Creates a caterpillar head and 10 caterpillar piece of body.
caterpillar_head = CaterpillarHead(scene)
caterpillar_head.rotate_y(90.0)
previous_caterpillar_piece = caterpillar_head
for i in range(10):
previous_caterpillar_piece = CaterpillarPiece(scene, previous_caterpillar_piece)
previous_caterpillar_piece.x = i + 1
# Creates a light.
light = soya.Light(scene)
light.set_xyz(2.0, 5.0, 0.0)
# Creates a camera.
camera = soya.Camera(scene)
camera.set_xyz(0.0, 15.0, 15.0)
camera.look_at(caterpillar_head)
soya.set_root_widget(camera)
soya.Idler(scene).idle()
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