弹跳形状#

Shape示例程序的屏幕截图
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.

Note: Sprites draw much faster than drawing primitives

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!"

NUMBER_OF_SHAPES = 500


class Shape:
    """ Generic base shape class """
    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
        if self.x < 0 and self.delta_x < 0:
            self.delta_x *= -1
        if self.y < 0 and self.delta_y < 0:
            self.delta_y *= -1
        if self.x > SCREEN_WIDTH and self.delta_x > 0:
            self.delta_x *= -1
        if self.y > SCREEN_HEIGHT and self.delta_y > 0:
            self.delta_y *= -1


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 Line(Shape):

    def draw(self):
        arcade.draw_line(self.x, self.y,
                         self.x + self.width, self.y + self.height,
                         self.color, 2)


class MyGame(arcade.Window):
    """ Main application class. """

    def __init__(self):
        # Call the parent __init__
        super().__init__(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)

        # Create a shape list
        self.shape_list = []

        for i in range(NUMBER_OF_SHAPES):

            # Random spot
            x = random.randrange(0, SCREEN_WIDTH)
            y = random.randrange(0, SCREEN_HEIGHT)

            # Random size
            width = random.randrange(15, 40)
            height = random.randrange(15, 40)

            # Random angle
            angle = random.randrange(0, 360)

            # Random movement
            d_x = random.randrange(-3, 4)
            d_y = random.randrange(-3, 4)
            d_angle = random.randrange(-3, 4)

            # Random color
            red = random.randrange(256)
            green = random.randrange(256)
            blue = random.randrange(256)
            alpha = random.randrange(256)

            # Random line, ellipse, or rect
            shape_type = random.randrange(3)

            if shape_type == 0:
                shape = Rectangle(x, y, width, height, angle, d_x, d_y,
                                  d_angle, (red, green, blue, alpha))
            elif shape_type == 1:
                shape = Ellipse(x, y, width, height, angle, d_x, d_y,
                                d_angle, (red, green, blue, alpha))
            else:
                shape = Line(x, y, width, height, angle, d_x, d_y,
                             d_angle, (red, green, blue, alpha))

            # Add this new shape to the list
            self.shape_list.append(shape)

    def on_update(self, dt):
        """ Move everything """
        for shape in self.shape_list:
            shape.move()

    def on_draw(self):
        """ Render the screen. """

        # Clear teh screen
        self.clear()

        # Draw the shapes
        for shape in self.shape_list:
            shape.draw()


def main():
    MyGame()
    arcade.run()


if __name__ == "__main__":
    main()