I'm having trouble with moving sprites. I can move them in the x and y axis with no problem at all. What I can't figure out is how can I move them according to a certain angle. What I mean is, I'm trying to create a function which includes the object I'm trying to move, its speed, and its direction(which should be measured in degrees). Something like:
MovingObject(obj,speed,direction) #this is the function I'm trying to define
It's more like a "spawning function" rather than just movement... Take for example that I would like to create an object of the class "Bullet" and want it to follow certain direction (different from the x and y axis, of course)
Actually I have no clear idea of how to do such thing and I would like some advice in order to achieve so.
Thanks for reading this!
EDIT:
@Joran Beasley I tried to do what you told me...but I guess I did it wrong...
import pygame, math, time
screen=pygame.display.set_mode((320,240))
clock=pygame.time.Clock()
pygame.init()
def calculate_new_xy(old_xy,speed,angle_in_radians):
new_x = old_xy.x + (speed*math.cos(angle_in_radians))
new_y = old_xy.y + (speed*math.sin(angle_in_radians))
return new_x, new_y
class Bullet(pygame.sprite.Sprite):
def __init__(self,x,y,direction,speed):
pygame.sprite.Sprite.__init__(self)
self.image=pygame.Surface((16, 16))
self.image.fill((255,0,0))
self.rect=self.image.get_rect()
self.rect.center=(x,y)
self.direction=math.radians(direction)
self.speed=speed
def update(self):
self.rect.center=calculate_new_xy(self.rect,self.speed,self.direction)
spr=pygame.sprite.Group()
bullet=Bullet(160,120,45,1); spr.add(bullet)
play=True
while play:
clock.tick(60)
for ev in pygame.event.get():
if ev.type == pygame.QUIT:
play=False
screen.fill((0,0,0))
spr.update()
spr.draw(screen)
pygame.display.flip()
pygame.quit()
The object moves but... not in the specified direction...
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