CODEWITHSUNDEEP
pythonpygameangle
user4609262
user4609262

Reputation:

Python Pygame find angle between two points

I am currently making a game which involves a sprite image to always face the mouse. I have looked everywhere for a function that does that, but I can't seem to find one. Is there a way to calculate an angle of difference from one point to another? Ex: 

angleA_X, angleA_Y = (12, 52)
angleB_X, angleB_Y = (45, 11)

deltaX = angleB_X - angleA_X
deltaY = angleB_Y - angleA_Y

tan = deltaX/deltaY

formula = math.atan(tan)

formula = formula ** 2
formula = math.sqrt(formula)

formula = math.degrees(formula)

print(formula)

This would calculate the difference in the angle, but this does not return the right anwser. Any idea what is wrong?

Upvotes: 0

Views: 2623

Answers (3)

furas
furas

Reputation: 142641

PyGame has pygame.math.Vector2() which have angle_to()

import pygame

angleA_X, angleA_Y = (12, 52)
angleB_X, angleB_Y = (45, 11)

a = pygame.math.Vector2(angleA_X, angleA_Y)
b = pygame.math.Vector2(angleB_X, angleB_Y)

zero = pygame.math.Vector2()

print( zero.angle_to(a-b) ) # 128.8298249049704

Upvotes: 1

gboffi
gboffi

Reputation: 25023

If you really need an angle

angle = math.atan2(ymouse-ysprite, xmouse-xsprite)

if you rather need the sine and the cosine

dy, dx = ymouse-ysprite, xmouse-xsprite
r = math.hypot(dx, dy)
s, c = dy/r, dx/r

Upvotes: 0

Francisco
Francisco

Reputation: 11476

You're doing some math operations that are not needed (such as ** 2 and sqrt), you just need math.atan2 (this will yield the angle in radians between A and B):

math.atan2(angleA_Y - angleB_Y, angleA_X - angleB_X)

math.atan2 has the benefit of also working when deltaX == 0.

Upvotes: 3

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