We're are trying to get the direction of a projectile but we can't find out how
For example:
[1,1] will go SE
[1,-1] will go NE
[-1,-1] will go NW
and [-1,1] will go SW
we need an equation of some sort that will take the player pos and the mouse pos and find which direction the projectile needs to go.
Here is where we are plugging in the vectors:
def update(self):
self.rect.x += self.vector[0]
self.rect.y += self.vector[1]
Then we are blitting the projectile at the rects coords.
Answer
To compute a direction you just need subtraction, and ideally normalisation.
self.vector = (mouse.position - player.position).normalize()
Note that your loop update should take the velocity and time between two frames into account:
self.rect.x += speed * timestep * self.vector[0]
self.rect.y += speed * timestep * self.vector[1]
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