Basic sprite movement

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- Bootfit
- - Joined 3 Sep, 2017
  - 158 topics • 469 posts
- 1
- 9 Nov, 2018
- Quote
Probably a really easy one this but I've yet to implement anything with basic movement...

On the title screen I have a character that starts off screen (at -50, 55) and walks on screen (to 15, 55).

What events or behaviours etc do I need to implement this?

Thanks all :)
- dop2000
- - Joined 26 May, 2016
  - 139 topics • 12,717 posts
- 1
- 9 Nov, 2018
- Quote
Depends on what you want this movement to look like.

If you just need constant speed, you can do this without any behaviors:
On every tick Character X<15 : Character move N*dt pixels

You can use lerp (very fast start, slows down as it gets closer to position):

Character set X to lerp(self.x, 15, dt)

Or try the new Tween behavior in C3 runtime, with it you can make different cool effects - acceleration, deceleration, bounce, etc.
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- R0J0hound
- - Joined 15 Jun, 2009
  - 90 topics • 7,295 posts
- 1
- 9 Nov, 2018
- Quote
You can use lerp in a different way as well to do the motion at a constant speed.

You can do it with a t variable.
Every tick — set t to min(1, t+dt/duation) — set x to lerp(startx, endx, t) — set y to lerp(starty, endy, t)

It will move from a start position to an end position in “duration” seconds.

Basically that’s what the easing behaviors do.