Easy way to move from A to B on curve? (like throwing a ball from A to B)

Solar2D General Questions/Discussion
#1

Hey all, I’ve been playing around with this scenario and thought I’d ask the group at large for ideas on how to best accomplish this:

I need to move an object, say a ball, from point A to point B, but along an angle.  Think of it as throwing a ball to another person - it has a natural angle about it as it leaves A in an upward motion and then moves toward B and arrives in a downward motion.  

FYI, point B can/will not be the same location, distance, etc. from point A every time, but I’d like the movement to follow some type of curve to point B.  

Is there a preferred way or function that anyone can recommend to make this easy on me?  I’d prefer to start with a transition-based method to avoid any additional physics complexities, but I’m open to transition or physics-based methods - whichever works best.  

Thanks for the help and ideas!

#2

I can do it with 3 functions, but I’m curious if there’s an easier way:

–B is the ball’s destination object

local transtime=1000

local ballrotate=mRand(300,700) --create some rotation to the ball as it is in motion

local trans1 = transition.to(ball, {time = transtime, x = B.x, rotation=-ballrotate})

local trans2 = transition.to(ball, {time = transtime/2, y = ball.y - 150, transition=easing.outQuad})

local trans3 = transition.to(ball, {delay = transtime/2, time = transtime/2, y = B.y, transition=easing.inQuad})

#3

hi, i’d probably use physics but you can also do it on an onFrame event.

from left to right.

local yfactor=-20

object.x=object.x+1 (constant)

object.y=object.y+yfactor

yfactor=yfactor+0.2 (or which ever value fits with how far you want to thro)

off my head

#4

By the sound of it, you want ballistic trajectory.

You can write your own easings, if you want to go through transitions, e.g. see here.

#5

I can do it with 3 functions, but I’m curious if there’s an easier way:

–B is the ball’s destination object

local transtime=1000

local ballrotate=mRand(300,700) --create some rotation to the ball as it is in motion

local trans1 = transition.to(ball, {time = transtime, x = B.x, rotation=-ballrotate})

local trans2 = transition.to(ball, {time = transtime/2, y = ball.y - 150, transition=easing.outQuad})

local trans3 = transition.to(ball, {delay = transtime/2, time = transtime/2, y = B.y, transition=easing.inQuad})

#6

hi, i’d probably use physics but you can also do it on an onFrame event.

from left to right.

local yfactor=-20

object.x=object.x+1 (constant)

object.y=object.y+yfactor

yfactor=yfactor+0.2 (or which ever value fits with how far you want to thro)

off my head

#7

By the sound of it, you want ballistic trajectory.

You can write your own easings, if you want to go through transitions, e.g. see here.