import math stage.set_background_color("grey") stage.disable_all_walls() #set up sprites and bases. base1 = codesters.Circle(-225, -225, 200, "brown") base2 = codesters.Circle(225, 225, 200, "brown") base1wall = codesters.Arc(-180, -190, 70, 330, 120, "sienna") base2wall = codesters.Arc(190, 180, 70, 160, 310, "sienna") player = codesters.Sprite("robot", -200, -200) player.set_size(0.5) computer = codesters.Sprite("enemy", 210, 210) computer.set_size(0.5) #set up game variables player.lives = 5 computer.lives = 5 game_over = False #When the player clicks, the player throws a snowball at the clicked coordinates. def click(): throw() stage.event_click(click) #calculate vector from player to point clicked, vectors are calculated by subtracting the second point by the first point (difference) def calculate_vector(mouseX, mouseY): vector_x = mouseX - player.get_x() vector_y = mouseY - player.get_y() return [vector_x, vector_y] #return the x and y component of the vector as a list #gets the magnitude of a vector; formula here where c is the magnitude: c^2 = a^2 + b^2 => c = sqrt(a^2 + b^2) def magnitude(vector): return math.sqrt(vector[0] * vector[0] + vector[1] * vector[1]) #normalizes a vector by dividing by the magnitude. def divide(vector, number): if number == 0: return vector normX = vector[0] / number #normalize x component normY = vector[1] / number #normalize y component return [normX, normY] #player throws a snowball towards a clicked point on the stage using vectors and velocity. def throw(): #actual vector to the clicked point. vector = calculate_vector(stage.click_x(), stage.click_y()) #get the magnitude of the vector so we can normalize the vector. mag = magnitude(vector) #normalize the vector (remove any current magnitude). norm = divide(vector, mag) shot = codesters.Circle(player.get_x(), player.get_y(), 7, "white") #after we normalize the vector, we multiply by 5 so that the speed is constant and moving in the correct direction. x_speed = norm[0] * 5 y_speed = norm[1] * 5 shot.set_x_speed(x_speed) shot.set_y_speed(y_speed) #creates a new enemy shot with random x and y speed (causing the snowballs direction to be randomized). def enemy_throw(): c_shot = codesters.Circle(computer.get_x(), computer.get_y(), 7, "black") c_shot.set_x_speed(-1 * random.randint(1, 5)) c_shot.set_y_speed(-1 * random.randint(1, 3)) #collision for both the player and the computer. def collision(sprite, hit_sprite): global game_over name = sprite.get_image_name() color = hit_sprite.get_color() if name is "robot" and color is "black": stage.remove_sprite(hit_sprite) sprite.say("Ouch!") player.lives -= 1 if player.lives < 1: game_over = True elif name is "enemy" and color is "white": stage.remove_sprite(hit_sprite) sprite.say("Ouch!") computer.lives -= 1 if computer.lives < 1: game_over = True player.event_collision(collision) computer.event_collision(collision) #main game function, runs the game. def main(): while game_over is False: enemy_throw() stage.wait(2) if __name__ == "__main__": main()