TetrArcade/arcade/examples/pymunk_joint_builder.py

323 lines
11 KiB
Python

"""
Pymunk 2
If Python and Arcade are installed, this example can be run from the command line with:
python -m arcade.examples.pymunk_joint_builder
"""
import arcade
import pymunk
import timeit
import math
import os
SCREEN_WIDTH = 1200
SCREEN_HEIGHT = 800
SCREEN_TITLE = "Pymunk 2 Example"
"""
Key bindings:
1 - Drag mode
2 - Make box mode
3 - Make PinJoint mode
4 - Make DampedSpring mode
S - No gravity or friction
L - Layout, no gravity, lots of friction
G - Gravity, little bit of friction
Right-click, fire coin
"""
class PhysicsSprite(arcade.Sprite):
def __init__(self, pymunk_shape, filename):
super().__init__(filename, center_x=pymunk_shape.body.position.x, center_y=pymunk_shape.body.position.y)
self.pymunk_shape = pymunk_shape
class CircleSprite(PhysicsSprite):
def __init__(self, pymunk_shape, filename):
super().__init__(pymunk_shape, filename)
self.width = pymunk_shape.radius * 2
self.height = pymunk_shape.radius * 2
class BoxSprite(PhysicsSprite):
def __init__(self, pymunk_shape, filename, width, height):
super().__init__(pymunk_shape, filename)
self.width = width
self.height = height
class MyApplication(arcade.Window):
""" Main application class. """
def __init__(self, width, height, title):
super().__init__(width, height, title)
# Set the working directory (where we expect to find files) to the same
# directory this .py file is in. You can leave this out of your own
# code, but it is needed to easily run the examples using "python -m"
# as mentioned at the top of this program.
file_path = os.path.dirname(os.path.abspath(__file__))
os.chdir(file_path)
arcade.set_background_color(arcade.color.DARK_SLATE_GRAY)
# -- Pymunk
self.space = pymunk.Space()
self.space.gravity = (0.0, -900.0)
# Lists of sprites or lines
self.sprite_list = arcade.SpriteList()
self.static_lines = []
# Used for dragging shapes aruond with the mouse
self.shape_being_dragged = None
self.last_mouse_position = 0, 0
self.processing_time_text = None
self.draw_time_text = None
self.draw_mode_text = None
self.shape_1 = None
self.shape_2 = None
self.draw_time = 0
self.processing_time = 0
self.joints = []
self.physics = "Normal"
self.mode = "Make Box"
# Create the floor
self.floor_height = 80
body = pymunk.Body(body_type=pymunk.Body.STATIC)
shape = pymunk.Segment(body, [0, self.floor_height], [SCREEN_WIDTH, self.floor_height], 0.0)
shape.friction = 10
self.space.add(shape)
self.static_lines.append(shape)
def on_draw(self):
"""
Render the screen.
"""
# This command has to happen before we start drawing
arcade.start_render()
# Start timing how long this takes
draw_start_time = timeit.default_timer()
# Draw all the sprites
self.sprite_list.draw()
# Draw the lines that aren't sprites
for line in self.static_lines:
body = line.body
pv1 = body.position + line.a.rotated(body.angle)
pv2 = body.position + line.b.rotated(body.angle)
arcade.draw_line(pv1.x, pv1.y, pv2.x, pv2.y, arcade.color.WHITE, 2)
for joint in self.joints:
color = arcade.color.WHITE
if isinstance(joint, pymunk.DampedSpring):
color = arcade.color.DARK_GREEN
arcade.draw_line(joint.a.position.x, joint.a.position.y, joint.b.position.x, joint.b.position.y, color, 3)
# arcade.draw_text(output, 10, 20, arcade.color.WHITE, 14)
# Display timings
output = f"Processing time: {self.processing_time:.3f}"
arcade.draw_text(output, 20, SCREEN_HEIGHT - 20, arcade.color.WHITE)
output = f"Drawing time: {self.draw_time:.3f}"
arcade.draw_text(output, 20, SCREEN_HEIGHT - 40, arcade.color.WHITE)
self.draw_time = timeit.default_timer() - draw_start_time
output = f"Mode: {self.mode}"
arcade.draw_text(output, 20, SCREEN_HEIGHT - 60, arcade.color.WHITE)
output = f"Physics: {self.physics}"
arcade.draw_text(output, 20, SCREEN_HEIGHT - 80, arcade.color.WHITE)
def make_box(self, x, y):
size = 45
mass = 12.0
moment = pymunk.moment_for_box(mass, (size, size))
body = pymunk.Body(mass, moment)
body.position = pymunk.Vec2d(x, y)
shape = pymunk.Poly.create_box(body, (size, size))
shape.friction = 0.3
self.space.add(body, shape)
sprite = BoxSprite(shape, "images/boxCrate_double.png", width=size, height=size)
self.sprite_list.append(sprite)
def make_circle(self, x, y):
size = 20
mass = 12.0
moment = pymunk.moment_for_circle(mass, 0, size, (0, 0))
body = pymunk.Body(mass, moment)
body.position = pymunk.Vec2d(x, y)
shape = pymunk.Circle(body, size, pymunk.Vec2d(0, 0))
shape.friction = 0.3
self.space.add(body, shape)
sprite = CircleSprite(shape, "images/coin_01.png")
self.sprite_list.append(sprite)
def make_pin_joint(self, x, y):
shape_selected = self.get_shape(x, y)
if shape_selected is None:
return
if self.shape_1 is None:
print("Shape 1 Selected")
self.shape_1 = shape_selected
elif self.shape_2 is None:
print("Shape 2 Selected")
self.shape_2 = shape_selected
joint = pymunk.PinJoint(self.shape_1.shape.body, self.shape_2.shape.body)
self.space.add(joint)
self.joints.append(joint)
self.shape_1 = None
self.shape_2 = None
print("Joint Made")
def make_damped_spring(self, x, y):
shape_selected = self.get_shape(x, y)
if shape_selected is None:
return
if self.shape_1 is None:
print("Shape 1 Selected")
self.shape_1 = shape_selected
elif self.shape_2 is None:
print("Shape 2 Selected")
self.shape_2 = shape_selected
joint = pymunk.DampedSpring(self.shape_1.shape.body, self.shape_2.shape.body, (0, 0), (0, 0), 45, 300, 30)
self.space.add(joint)
self.joints.append(joint)
self.shape_1 = None
self.shape_2 = None
print("Joint Made")
def get_shape(self, x, y):
# See if we clicked on anything
shape_list = self.space.point_query((x, y), 1, pymunk.ShapeFilter())
# If we did, remember what we clicked on
if len(shape_list) > 0:
shape = shape_list[0]
else:
shape = None
return shape
def on_mouse_press(self, x, y, button, modifiers):
if button == 1 and self.mode == "Drag":
self.last_mouse_position = x, y
self.shape_being_dragged = self.get_shape(x, y)
elif button == 1 and self.mode == "Make Box":
self.make_box(x, y)
elif button == 1 and self.mode == "Make Circle":
self.make_circle(x, y)
elif button == 1 and self.mode == "Make PinJoint":
self.make_pin_joint(x, y)
elif button == 1 and self.mode == "Make DampedSpring":
self.make_damped_spring(x, y)
elif button == 4:
# With right mouse button, shoot a heavy coin fast.
mass = 60
radius = 10
inertia = pymunk.moment_for_circle(mass, 0, radius, (0, 0))
body = pymunk.Body(mass, inertia)
body.position = x, y
body.velocity = 2000, 0
shape = pymunk.Circle(body, radius, pymunk.Vec2d(0, 0))
shape.friction = 0.3
self.space.add(body, shape)
sprite = CircleSprite(shape, "images/coin_01.png")
self.sprite_list.append(sprite)
def on_mouse_release(self, x, y, button, modifiers):
if button == 1:
# Release the item we are holding (if any)
self.shape_being_dragged = None
def on_mouse_motion(self, x, y, dx, dy):
if self.shape_being_dragged is not None:
# If we are holding an object, move it with the mouse
self.last_mouse_position = x, y
self.shape_being_dragged.shape.body.position = self.last_mouse_position
self.shape_being_dragged.shape.body.velocity = dx * 20, dy * 20
def on_key_press(self, symbol: int, modifiers: int):
if symbol == arcade.key.KEY_1:
self.mode = "Drag"
elif symbol == arcade.key.KEY_2:
self.mode = "Make Box"
elif symbol == arcade.key.KEY_3:
self.mode = "Make Circle"
elif symbol == arcade.key.KEY_4:
self.mode = "Make PinJoint"
elif symbol == arcade.key.KEY_5:
self.mode = "Make DampedSpring"
elif symbol == arcade.key.S:
self.space.gravity = (0.0, 0.0)
self.space.damping = 1
self.physics = "Outer Space"
elif symbol == arcade.key.L:
self.space.gravity = (0.0, 0.0)
self.space.damping = 0
self.physics = "Layout"
elif symbol == arcade.key.G:
self.space.damping = 0.95
self.space.gravity = (0.0, -900.0)
self.physics = "Normal"
def update(self, delta_time):
start_time = timeit.default_timer()
# Check for balls that fall off the screen
for sprite in self.sprite_list:
if sprite.pymunk_shape.body.position.y < 0:
# Remove balls from physics space
self.space.remove(sprite.pymunk_shape, sprite.pymunk_shape.body)
# Remove balls from physics list
sprite.kill()
# Update physics
self.space.step(1 / 80.0)
# If we are dragging an object, make sure it stays with the mouse. Otherwise
# gravity will drag it down.
if self.shape_being_dragged is not None:
self.shape_being_dragged.shape.body.position = self.last_mouse_position
self.shape_being_dragged.shape.body.velocity = 0, 0
# Move sprites to where physics objects are
for sprite in self.sprite_list:
sprite.center_x = sprite.pymunk_shape.body.position.x
sprite.center_y = sprite.pymunk_shape.body.position.y
sprite.angle = math.degrees(sprite.pymunk_shape.body.angle)
# Save the time it took to do this.
self.processing_time = timeit.default_timer() - start_time
window = MyApplication(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
arcade.run()