CODEWITHSUNDEEP
pythonpygame
Thedudxo
Thedudxo

Reputation: 591

moving a rectangle to a specific point

I am trying to move a rectangle to a specific point with a specific speed.

however it only works properly if x,y (the point i am trying to move it to) are the same. otherwise, if x was bigger than y it would move at a 45 degree angle until self.location[1]==y(it reached where it needed to be for y), then it would move in a straight for x and vise versa.

i know that i would have to change speed_y so that it was slower. how do i work out what speed i need y to be at in order to get the rectangle to move to location in a straight line no matter what location is?

full function:

def move(self,x,y,speed):
    if speed==0:
        self.location=[x,y]
    else:
        speed_x = speed
        speed_y = speed
        if x > 0 and not self.location[0]==x: # x is positive and not already where it needs to be
            if not x == y:
                speed_x = something # need to slow down the speed so that it gets to  y as the same time as it gets to x

            self.speed_x=speed_x
        else: self.speed_x=0

        if y > 0 and not self.location[1]==y: # same for y
            if not x == y:
                speed_y = something # need to slow down the speed so that it gets to  y as the same time as it gets to x

            self.speed_y=speed_y
        else: self.speed_y=0

Upvotes: 0

Views: 619

Answers (3)

Rossco
Rossco

Reputation: 26

You should set your speeds to a ratio of required distance for each axis. e.g. if distance to x is half distance to y then speed_x should be half speed_y.

Further example as requested:

distance_x = x-self.location[0]
distance_y = y-self.location[1]
if abs(distance_x) < abs(distance_y):
    ratio = distance_x/abs(distance_y)
    speed_x = ratio * speed

edit: Reworked the directions of example.

Upvotes: 1

MetaShinryu
MetaShinryu

Reputation: 11

I don't quite get what you are asking for, but see if this helps you:

speed_x = speed*(cos(atan2((y-self.location[1]), (x-self.location[0])))) 
speed_y = speed*(sin(atan2((y-self.location[1]), (x-self.location[0]))))

That would "slow" the speed you are given by splitting it in the values needed to get to where you want your box to be at the same time.

Pardon any errors in my english/python, im not native on either one :)

Upvotes: 1

furas
furas

Reputation: 142631

You need mathematical calculations to get new position in every move.

Upvotes: -1

Related Questions