Drawing Shapes with Classes¶

shapes.py¶
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This simple animation example shows how to use classes to animate
multiple objects on the screen at the same time.
Because this is redraws the shapes from scratch each frame, this is SLOW
and inefficient.
Using buffered drawing commands (Vertex Buffer Objects) is a bit more complex,
but faster.
See http://arcade.academy/examples/index.html#shape-lists for some examples.
Also, any Sprite class put in a SpriteList and drawn with the SpriteList will
be drawn using Vertex Buffer Objects for better performance.
If Python and Arcade are installed, this example can be run from the command line with:
python -m arcade.examples.shapes
"""
import arcade
import random
# Set up the constants
SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600
SCREEN_TITLE = "Shapes!"
RECT_WIDTH = 50
RECT_HEIGHT = 50
NUMBER_OF_SHAPES = 200
class Shape:
def __init__(self, x, y, width, height, angle, delta_x, delta_y,
delta_angle, color):
self.x = x
self.y = y
self.width = width
self.height = height
self.angle = angle
self.delta_x = delta_x
self.delta_y = delta_y
self.delta_angle = delta_angle
self.color = color
def move(self):
self.x += self.delta_x
self.y += self.delta_y
self.angle += self.delta_angle
class Ellipse(Shape):
def draw(self):
arcade.draw_ellipse_filled(self.x, self.y, self.width, self.height,
self.color, self.angle)
class Rectangle(Shape):
def draw(self):
arcade.draw_rectangle_filled(self.x, self.y, self.width, self.height,
self.color, self.angle)
class MyGame(arcade.Window):
""" Main application class. """
def __init__(self):
super().__init__(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
self.shape_list = None
def setup(self):
""" Set up the game and initialize the variables. """
self.shape_list = []
for i in range(NUMBER_OF_SHAPES):
x = random.randrange(0, SCREEN_WIDTH)
y = random.randrange(0, SCREEN_HEIGHT)
width = random.randrange(10, 30)
height = random.randrange(10, 30)
angle = random.randrange(0, 360)
d_x = random.randrange(-3, 4)
d_y = random.randrange(-3, 4)
d_angle = random.randrange(-3, 4)
red = random.randrange(256)
green = random.randrange(256)
blue = random.randrange(256)
alpha = random.randrange(256)
shape_type = random.randrange(2)
if shape_type == 0:
shape = Rectangle(x, y, width, height, angle, d_x, d_y,
d_angle, (red, green, blue, alpha))
else:
shape = Ellipse(x, y, width, height, angle, d_x, d_y,
d_angle, (red, green, blue, alpha))
self.shape_list.append(shape)
def update(self, dt):
""" Move everything """
for shape in self.shape_list:
shape.move()
def on_draw(self):
"""
Render the screen.
"""
arcade.start_render()
for shape in self.shape_list:
shape.draw()
def main():
window = MyGame()
window.setup()
arcade.run()
if __name__ == "__main__":
main()
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