114 lines
2.7 KiB
Python
114 lines
2.7 KiB
Python
"""
|
|
Bounce balls on the screen.
|
|
Spawn a new ball for each mouse-click.
|
|
|
|
If Python and Arcade are installed, this example can be run from the command line with:
|
|
python -m arcade.examples.bouncing_balls
|
|
"""
|
|
|
|
import arcade
|
|
import random
|
|
|
|
# --- Set up the constants
|
|
|
|
# Size of the screen
|
|
SCREEN_WIDTH = 600
|
|
SCREEN_HEIGHT = 600
|
|
SCREEN_TITLE = "Bouncing Balls Example"
|
|
|
|
|
|
class Ball:
|
|
"""
|
|
Class to keep track of a ball's location and vector.
|
|
"""
|
|
def __init__(self):
|
|
self.x = 0
|
|
self.y = 0
|
|
self.change_x = 0
|
|
self.change_y = 0
|
|
self.size = 0
|
|
self.color = None
|
|
|
|
|
|
def make_ball():
|
|
"""
|
|
Function to make a new, random ball.
|
|
"""
|
|
ball = Ball()
|
|
|
|
# Size of the ball
|
|
ball.size = random.randrange(10, 30)
|
|
|
|
# Starting position of the ball.
|
|
# Take into account the ball size so we don't spawn on the edge.
|
|
ball.x = random.randrange(ball.size, SCREEN_WIDTH - ball.size)
|
|
ball.y = random.randrange(ball.size, SCREEN_HEIGHT - ball.size)
|
|
|
|
# Speed and direction of rectangle
|
|
ball.change_x = random.randrange(-2, 3)
|
|
ball.change_y = random.randrange(-2, 3)
|
|
|
|
# Color
|
|
ball.color = (random.randrange(256), random.randrange(256), random.randrange(256))
|
|
|
|
return ball
|
|
|
|
|
|
class MyGame(arcade.Window):
|
|
""" Main application class. """
|
|
|
|
def __init__(self):
|
|
super().__init__(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
|
|
self.ball_list = []
|
|
ball = make_ball()
|
|
self.ball_list.append(ball)
|
|
|
|
def on_draw(self):
|
|
"""
|
|
Render the screen.
|
|
"""
|
|
|
|
# This command has to happen before we start drawing
|
|
arcade.start_render()
|
|
|
|
for ball in self.ball_list:
|
|
arcade.draw_circle_filled(ball.x, ball.y, ball.size, ball.color)
|
|
|
|
# Put the text on the screen.
|
|
output = "Balls: {}".format(len(self.ball_list))
|
|
arcade.draw_text(output, 10, 20, arcade.color.WHITE, 14)
|
|
|
|
def update(self, delta_time):
|
|
""" Movement and game logic """
|
|
for ball in self.ball_list:
|
|
ball.x += ball.change_x
|
|
ball.y += ball.change_y
|
|
|
|
if ball.x < ball.size:
|
|
ball.change_x *= -1
|
|
|
|
if ball.y < ball.size:
|
|
ball.change_y *= -1
|
|
|
|
if ball.x > SCREEN_WIDTH - ball.size:
|
|
ball.change_x *= -1
|
|
|
|
if ball.y > SCREEN_HEIGHT - ball.size:
|
|
ball.change_y *= -1
|
|
|
|
def on_mouse_press(self, x, y, button, modifiers):
|
|
"""
|
|
Called whenever the mouse button is clicked.
|
|
"""
|
|
ball = make_ball()
|
|
self.ball_list.append(ball)
|
|
|
|
|
|
def main():
|
|
MyGame()
|
|
arcade.run()
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|