How do I rotate an image around its center using Pygame?
Solution 1:
Short answer:
Get the rectangle of the original image and set the position. Get the rectangle of the rotated image and set the center position through the center of the original rectangle. Return a tuple of the rotated image and the rectangle:
def rot_center(image, angle, x, y):
rotated_image = pygame.transform.rotate(image, angle)
new_rect = rotated_image.get_rect(center = image.get_rect(center = (x, y)).center)
return rotated_image, new_rect
Or write a function which rotates and .blit the image:
def blitRotateCenter(surf, image, topleft, angle):
rotated_image = pygame.transform.rotate(image, angle)
new_rect = rotated_image.get_rect(center = image.get_rect(topleft = topleft).center)
surf.blit(rotated_image, new_rect)
Long answer:
An image (pygame.Surface) can be rotated by pygame.transform.rotate.
If that is done progressively in a loop, then the image gets distorted and rapidly increases:
while not done:
# [...]
image = pygame.transform.rotate(image, 1)
screen.blit(image, pos)
pygame.display.flip()
This is because the bounding rectangle of a rotated image is always greater than the bounding rectangle of the original image (except some rotations by multiples of 90 degrees).
The image gets distort because of the multiply copies. Each rotation generates a small error (inaccuracy). The sum of the errors is growing and the images decays.
That can be fixed by keeping the original image and "blit" an image which was generated by a single rotation operation form the original image.
angle = 0
while not done:
# [...]
rotated_image = pygame.transform.rotate(image, angle)
angle += 1
screen.blit(rotated_image, pos)
pygame.display.flip()
Now the image seems to arbitrary change its position, because the size of the image changes by the rotation and origin is always the top left of the bounding rectangle of the image.
This can be compensated by comparing the axis aligned bounding box of the image before the rotation and after the rotation.
For the following math pygame.math.Vector2 is used. Note in screen coordinates the y points down the screen, but the mathematical y axis points form the bottom to the top. This causes that the y axis has to be "flipped" during calculations
Set up a list with the 4 corner points of the bounding box:
w, h = image.get_size()
box = [pygame.math.Vector2(p) for p in [(0, 0), (w, 0), (w, -h), (0, -h)]]
Rotate the vectors to the corner points by pygame.math.Vector2.rotate:
box_rotate = [p.rotate(angle) for p in box]
Get the minimum and the maximum of the rotated points:
min_box = (min(box_rotate, key=lambda p: p[0])[0], min(box_rotate, key=lambda p: p[1])[1])
max_box = (max(box_rotate, key=lambda p: p[0])[0], max(box_rotate, key=lambda p: p[1])[1])
Calculate the "compensated" origin of the upper left point of the image by adding the minimum of the rotated box to the position. For the y coordinate max_box[1] is the minimum, because of the "flipping" along the y axis:
origin = (pos[0] + min_box[0], pos[1] - max_box[1])
rotated_image = pygame.transform.rotate(image, angle)
screen.blit(rotated_image, origin)
It is even possible to define a pivot on the original image. Compute the offset vector from the center of the image to the pivot and rotate the vector. A vector can be represented by pygame.math.Vector2 and can be rotated with pygame.math.Vector2.rotate. Notice that pygame.math.Vector2.rotate rotates in the opposite direction than pygame.transform.rotate. Therefore the angle has to be inverted:
Compute the vector from the center of the image to the pivot:
image_rect = image.get_rect(topleft = (pos[0] - originPos[0], pos[1]-originPos[1]))
offset_center_to_pivot = pygame.math.Vector2(pos) - image_rect.center
Rotate the vector
rotated_offset = offset_center_to_pivot.rotate(-angle)
Calculate the center of the rotated image:
rotated_image_center = (pos[0] - rotated_offset.x, pos[1] - rotated_offset.y)
Rotate and blit the image:
rotated_image = pygame.transform.rotate(image, angle)
rotated_image_rect = rotated_image.get_rect(center = rotated_image_center)
screen.blit(rotated_image, rotated_image_rect)
In the following example program, the function blitRotate(surf, image, pos, originPos, angle) does all the above steps and "blit" a rotated image to a surface.
-
surfis the target Surface -
imageis the Surface which has to be rotated andblit -
posis the position of the pivot on the target Surfacesurf(relative to the top left ofsurf) -
originPosis position of the pivot on theimageSurface (relative to the top left ofimage) -
angleis the angle of rotation in degrees
This means, the 2nd argument (pos) of blitRotate is the position of the pivot point in the window and the 3rd argument (originPos) is the position of the pivot point on the rotating Surface:
Minimal example: 
repl.it/@Rabbid76/PyGame-RotateAroundPivot
import pygame
pygame.init()
screen = pygame.display.set_mode((300, 300))
clock = pygame.time.Clock()
def blitRotate(surf, image, pos, originPos, angle):
# offset from pivot to center
image_rect = image.get_rect(topleft = (pos[0] - originPos[0], pos[1]-originPos[1]))
offset_center_to_pivot = pygame.math.Vector2(pos) - image_rect.center
# roatated offset from pivot to center
rotated_offset = offset_center_to_pivot.rotate(-angle)
# roatetd image center
rotated_image_center = (pos[0] - rotated_offset.x, pos[1] - rotated_offset.y)
# get a rotated image
rotated_image = pygame.transform.rotate(image, angle)
rotated_image_rect = rotated_image.get_rect(center = rotated_image_center)
# rotate and blit the image
surf.blit(rotated_image, rotated_image_rect)
# draw rectangle around the image
pygame.draw.rect(surf, (255, 0, 0), (*rotated_image_rect.topleft, *rotated_image.get_size()),2)
def blitRotate2(surf, image, topleft, angle):
rotated_image = pygame.transform.rotate(image, angle)
new_rect = rotated_image.get_rect(center = image.get_rect(topleft = topleft).center)
surf.blit(rotated_image, new_rect.topleft)
pygame.draw.rect(surf, (255, 0, 0), new_rect, 2)
try:
image = pygame.image.load('AirPlaneFront.png')
except:
text = pygame.font.SysFont('Times New Roman', 50).render('image', False, (255, 255, 0))
image = pygame.Surface((text.get_width()+1, text.get_height()+1))
pygame.draw.rect(image, (0, 0, 255), (1, 1, *text.get_size()))
image.blit(text, (1, 1))
w, h = image.get_size()
angle = 0
done = False
while not done:
clock.tick(60)
for event in pygame.event.get():
if event.type == pygame.QUIT:
done = True
pos = (screen.get_width()/2, screen.get_height()/2)
screen.fill(0)
blitRotate(screen, image, pos, (w/2, h/2), angle)
#blitRotate2(screen, image, pos, angle)
angle += 1
pygame.draw.line(screen, (0, 255, 0), (pos[0]-20, pos[1]), (pos[0]+20, pos[1]), 3)
pygame.draw.line(screen, (0, 255, 0), (pos[0], pos[1]-20), (pos[0], pos[1]+20), 3)
pygame.draw.circle(screen, (0, 255, 0), pos, 7, 0)
pygame.display.flip()
pygame.quit()
exit()
See also Rotate surface and the answers to the questions:
- How can you rotate an image around an off center pivot in Pygame
- How to rotate an image around its center while its scale is getting larger(in Pygame)
- How do you point the barrel towards mouse in pygame?
Solution 2:
You are deleting the rect that rotate creates. You need to preserve rect, since it changes size when rotated.
If you want to preserve the objects location, do:
def rot_center(image, angle):
"""rotate a Surface, maintaining position."""
loc = image.get_rect().center #rot_image is not defined
rot_sprite = pygame.transform.rotate(image, angle)
rot_sprite.get_rect().center = loc
return rot_sprite
# or return tuple: (Surface, Rect)
# return rot_sprite, rot_sprite.get_rect()
Solution 3:
There are some problems with the top answer: The position of the previous rect needs to be available in the function, so that we can assign it to the new rect, e.g.:
rect = new_image.get_rect(center=rect.center)
In the other answer the location is obtained by creating a new rect from the original image, but that means it will be positioned at the default (0, 0) coordinates.
The example below should work correctly. The new rect needs the center position of the old rect, so we pass it as well to the function. Then rotate the image, call get_rect to get a new rect with the correct size and pass the center attribute of the old rect as the center argument. Finally, return both the rotated image and the new rect as a tuple and unpack it in the main loop.
import pygame as pg
def rotate(image, rect, angle):
"""Rotate the image while keeping its center."""
# Rotate the original image without modifying it.
new_image = pg.transform.rotate(image, angle)
# Get a new rect with the center of the old rect.
rect = new_image.get_rect(center=rect.center)
return new_image, rect
def main():
clock = pg.time.Clock()
screen = pg.display.set_mode((640, 480))
gray = pg.Color('gray15')
blue = pg.Color('dodgerblue2')
image = pg.Surface((320, 200), pg.SRCALPHA)
pg.draw.polygon(image, blue, ((0, 0), (320, 100), (0, 200)))
# Keep a reference to the original to preserve the image quality.
orig_image = image
rect = image.get_rect(center=(320, 240))
angle = 0
done = False
while not done:
for event in pg.event.get():
if event.type == pg.QUIT:
done = True
angle += 2
image, rect = rotate(orig_image, rect, angle)
screen.fill(gray)
screen.blit(image, rect)
pg.display.flip()
clock.tick(30)
if __name__ == '__main__':
pg.init()
main()
pg.quit()
Here's another example with a rotating pygame sprite.
import pygame as pg
class Entity(pg.sprite.Sprite):
def __init__(self, pos):
super().__init__()
self.image = pg.Surface((122, 70), pg.SRCALPHA)
pg.draw.polygon(self.image, pg.Color('dodgerblue1'),
((1, 0), (120, 35), (1, 70)))
# A reference to the original image to preserve the quality.
self.orig_image = self.image
self.rect = self.image.get_rect(center=pos)
self.angle = 0
def update(self):
self.angle += 2
self.rotate()
def rotate(self):
"""Rotate the image of the sprite around its center."""
# `rotozoom` usually looks nicer than `rotate`. Pygame's rotation
# functions return new images and don't modify the originals.
self.image = pg.transform.rotozoom(self.orig_image, self.angle, 1)
# Create a new rect with the center of the old rect.
self.rect = self.image.get_rect(center=self.rect.center)
def main():
screen = pg.display.set_mode((640, 480))
clock = pg.time.Clock()
all_sprites = pg.sprite.Group(Entity((320, 240)))
while True:
for event in pg.event.get():
if event.type == pg.QUIT:
return
all_sprites.update()
screen.fill((30, 30, 30))
all_sprites.draw(screen)
pg.display.flip()
clock.tick(30)
if __name__ == '__main__':
pg.init()
main()
pg.quit()