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164 | """
Sprite Follow Path
This example has enemy sprites follow a set path.
Artwork from https://kenney.nl
If Python and Arcade are installed, this example can be run from the command line with:
python -m arcade.examples.sprite_follow_path
"""
import arcade
import math
# --- Constants ---
SPRITE_SCALING_PLAYER = 0.5
SPRITE_SCALING_ENEMY = 0.5
ENEMY_SPEED = 3.0
SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600
SCREEN_TITLE = "Sprite Follow Path Simple Example"
class Enemy(arcade.Sprite):
"""
This class represents the Enemy on our screen.
"""
def __init__(self, image, scale, position_list):
super().__init__(image, scale)
self.position_list = position_list
self.cur_position = 0
self.speed = ENEMY_SPEED
def update(self):
""" Have a sprite follow a path """
# Where are we
start_x = self.center_x
start_y = self.center_y
# Where are we going
dest_x = self.position_list[self.cur_position][0]
dest_y = self.position_list[self.cur_position][1]
# X and Y diff between the two
x_diff = dest_x - start_x
y_diff = dest_y - start_y
# Calculate angle to get there
angle = math.atan2(y_diff, x_diff)
# How far are we?
distance = math.sqrt((self.center_x - dest_x) ** 2 + (self.center_y - dest_y) ** 2)
# How fast should we go? If we are close to our destination,
# lower our speed so we don't overshoot.
speed = min(self.speed, distance)
# Calculate vector to travel
change_x = math.cos(angle) * speed
change_y = math.sin(angle) * speed
# Update our location
self.center_x += change_x
self.center_y += change_y
# How far are we?
distance = math.sqrt((self.center_x - dest_x) ** 2 + (self.center_y - dest_y) ** 2)
# If we are there, head to the next point.
if distance <= self.speed:
self.cur_position += 1
# Reached the end of the list, start over.
if self.cur_position >= len(self.position_list):
self.cur_position = 0
class MyGame(arcade.Window):
""" Our custom Window Class"""
def __init__(self):
""" Initializer """
# Call the parent class initializer
super().__init__(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
# Variables that will hold sprite lists
self.player_list = None
self.enemy_list = None
# Set up the player info
self.player_sprite = None
self.score = 0
# Don't show the mouse cursor
self.set_mouse_visible(False)
arcade.set_background_color(arcade.color.AMAZON)
def setup(self):
""" Set up the game and initialize the variables. """
# Sprite lists
self.player_list = arcade.SpriteList()
self.enemy_list = arcade.SpriteList()
# Score
self.score = 0
# Set up the player
# Character image from kenney.nl
self.player_sprite = arcade.Sprite(":resources:images/animated_characters/female_person/"
"femalePerson_idle.png", SPRITE_SCALING_PLAYER)
self.player_sprite.center_x = 50
self.player_sprite.center_y = 50
self.player_list.append(self.player_sprite)
# List of points the enemy will travel too.
position_list = [[50, 50],
[700, 50],
[700, 500],
[50, 500]]
# Create the enemy
enemy = Enemy(":resources:images/animated_characters/robot/robot_idle.png",
SPRITE_SCALING_ENEMY,
position_list)
# Set initial location of the enemy at the first point
enemy.center_x = position_list[0][0]
enemy.center_x = position_list[0][1]
# Add the enemy to the enemy list
self.enemy_list.append(enemy)
def on_draw(self):
""" Draw everything """
self.clear()
self.enemy_list.draw()
self.player_list.draw()
def on_mouse_motion(self, x, y, dx, dy):
""" Handle Mouse Motion """
# Move the center of the player sprite to match the mouse x, y
self.player_sprite.center_x = x
self.player_sprite.center_y = y
def on_update(self, delta_time):
""" Movement and game logic """
self.enemy_list.update()
def main():
""" Main function """
window = MyGame()
window.setup()
arcade.run()
if __name__ == "__main__":
main()
|