Make A Sprite Move To The Mouse Click Position Step By Step
I'm writing a little pirate game in Pygame. If you played sea battles in Empires Total War, you have an idea of what I would like to achieve: The ship's sprite is at position (x1|y
Solution 1:
Say the current position is pos
, and the point the player clicked is target_pos
, then take the vector between pos
and target_pos
.
Now you know how to get from pos
to target_pos
, but to move in constant speed (and not the entire distance at once), you have to normalize the vector, and apply a speed constant by scalar multiplication.
That's it.
Complete example:(the relevant code is in the Ship.update
method)
import pygame
class Ship(pygame.sprite.Sprite):
def __init__(self, speed, color):
super().__init__()
self.image = pygame.Surface((10, 10))
self.image.set_colorkey((12,34,56))
self.image.fill((12,34,56))
pygame.draw.circle(self.image, color, (5, 5), 3)
self.rect = self.image.get_rect()
self.pos = pygame.Vector2(0, 0)
self.set_target((0, 0))
self.speed = speed
def set_target(self, pos):
self.target = pygame.Vector2(pos)
def update(self):
move = self.target - self.pos
move_length = move.length()
if move_length < self.speed:
self.pos = self.target
elif move_length != 0:
move.normalize_ip()
move = move * self.speed
self.pos += move
self.rect.topleft = list(int(v) for v in self.pos)
def main():
pygame.init()
quit = False
screen = pygame.display.set_mode((300, 300))
clock = pygame.time.Clock()
group = pygame.sprite.Group(
Ship(1.5, pygame.Color('white')),
Ship(3.0, pygame.Color('orange')),
Ship(4.5, pygame.Color('dodgerblue')))
while not quit:
for event in pygame.event.get():
if event.type == pygame.QUIT:
return
if event.type == pygame.MOUSEBUTTONDOWN:
for ship in group.sprites():
ship.set_target(pygame.mouse.get_pos())
group.update()
screen.fill((20, 20, 20))
group.draw(screen)
pygame.display.flip()
clock.tick(60)
if __name__ == '__main__':
main()
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