Parabolic Canon Ball Movement

[MongKong]

So far i made it so when im looking right and i press space i shoot a canonball which moves like a parabola, tho i dont know how to make it so when im turned left and i press space that it moves the same way, just to the left....
this is the code:

and this is the parabolic function im using:

And with my variables:

I added *0.5 because i didn't canon ball to land too far away from the ship

Here is the video on how the canon ball moves using this function :
https://streamable.com/4xpnx

If any1 could figure out a function which i could use for when my ship is turned left i'd really appreciate it... I tried adding and subtracting stuff from this function but nothing worked out as it should've.... So please if anyone knows any solution to it please help me out :(

[mrjj]

Hi
Its not so nice with pictures for code as you cant cut and paste. or even scroll to see all of it.
Anyway,
the x()+moveByX seems to control the direction so
MoveByX += 0.1
could be
MoveByX += - 0.1 ( when direction == 3 )
to decrease the x ?

the parabolic seems only to be used for the y decay.

[JonB]

@MongKong

g / 2 vO2 cos2(theta)

Excuse me, may I ask: is g gravity? is v velocity?? what is the big O??? :)

[MongKong]

@mrjj
i tried and it doesn't work :/ y is getting lower and lower

[MongKong]

@JonB

ye g is gravity while v0 is initial speed

[mrjj]

@MongKong said in Parabolic Canon Ball Movement:

tried and it doesn't work :

try to output x values with QDebug and see why.

[MongKong]

@mrjj
yep i did so and i figured it out just minutes ago, i had to add another variable for X cords and now it's working perfectly thank you all!