Sorry your browser is not supported!

You are using an outdated browser that does not support modern web technologies, in order to use this site please update to a new browser.

Browsers supported include Chrome, FireFox, Safari, Opera, Internet Explorer 10+ or Microsoft Edge.

Newcomers AppGameKit Corner / [SOLVED] Fixtoscreen physics question

Author
Message
dandrews
3
Years of Service
User Offline
Joined: 26th Jun 2020
Location:
Posted: 30th Jun 2020 23:46
Link
So I've seen that you should not use fixtoscreen if using physics. When making a side scroll game what are some better ways of handling physics or keeping the sprite screen position while scrolling? I've come across a post talking about screen to world commands but haven't found any good tutorials on the subject.
Back to top
Profile PM

The author of this post has marked a post as an answer.

Go to answer

blink0k
Moderator
11
Years of Service
User Offline
Joined: 22nd Feb 2013
Location: the land of oz
Posted: 1st Jul 2020 00:44
Link
You can setup your entire level and use SetViewOffset() to move the camera.
FixSpriteToScreen() can be used to make sure things like player avatar and score etc stay on screen at all times
Back to top
Profile PM
dandrews
3
Years of Service
User Offline
Joined: 26th Jun 2020
Location:
Posted: 1st Jul 2020 02:16
Link
Thanks for responding blink. I'm using fixsprite to screen for the character now. What I'm trying to do is have a obstacle in the way like a vehicle or roadblock to where the player has to walk around it but even with the physics on he travels right through or glitches around. I'm using only the players x position as view offset so the character can only move up and down while staying at about 1/3 of the screen width.
Back to top
Profile PM
blink0k
Moderator
11
Years of Service
User Offline
Joined: 22nd Feb 2013
Location: the land of oz
Posted: 1st Jul 2020 03:55 Edited at: 1st Jul 2020 03:56
Link
So are your making a side scroller something like this?


Characters can move left/right and up/down
Back to top
Profile PM
dandrews
3
Years of Service
User Offline
Joined: 26th Jun 2020
Location:
Posted: 1st Jul 2020 04:28 Edited at: 1st Jul 2020 04:29
Link
yes i am.... ive tried moveing the character around without the view off set and fix to screen just to get a grasp on using physics i have the car set to 1 and the player set to 2.... shouldnt the car stop the player from moving in this case? it bounces a little but passes right through. the car is stationary btw as well
Back to top
Profile PM
blink0k
Moderator
11
Years of Service
User Offline
Joined: 22nd Feb 2013
Location: the land of oz
Posted: 1st Jul 2020 05:12
Link
Are you using 2D physics or 3D physics?
What command(s) do you use to move the player?
Back to top
Profile PM
dandrews
3
Years of Service
User Offline
Joined: 26th Jun 2020
Location:
Posted: 1st Jul 2020 05:30
Link
This post has been marked by the post author as the answer.
yes im using 2d physics and im moving the player with a virtual joystick

Back to top
Profile PM
blink0k
Moderator
11
Years of Service
User Offline
Joined: 22nd Feb 2013
Location: the land of oz
Posted: 1st Jul 2020 05:42 Edited at: 1st Jul 2020 05:45
Link
If the player is a dynamic object you cannot move it using setspriteposition(), you need to use force or impulse or velocity
if the player is a kinematic object then it will not collide with static objects

https://www.appgamekit.com/documentation/Reference/Sprite/SetSpritePhysicsForce.htm
https://www.appgamekit.com/documentation/Reference/Sprite/SetSpritePhysicsImpulse.htm
https://www.appgamekit.com/documentation/Reference/Sprite/SetSpritePhysicsVelocity.htm

My advice is not to use physics
Back to top
Profile PM
dandrews
3
Years of Service
User Offline
Joined: 26th Jun 2020
Location:
Posted: 1st Jul 2020 05:45
Link
thanks a lot blink ! i will study these links and see what i can do
Back to top
Profile PM
Virtual Nomad
Moderator
18
Years of Service
User Offline
Joined: 14th Dec 2005
Location: SF Bay Area, USA
Posted: 1st Jul 2020 05:56
Link
Quote: "I've seen that you should not use fixtoscreen if using physics. "

+
Quote: "I'm using fixsprite to screen for the character now."

=

don't use FixSpriteToScreen() for this; SetViewOffset() is where you need to be
My Itch.io Home.
Back to top
Profile PM Website
dandrews
3
Years of Service
User Offline
Joined: 26th Jun 2020
Location:
Posted: 1st Jul 2020 16:12 Edited at: 1st Jul 2020 17:01
Link
haha yeah i guess those quotes are confusing nomad . what i ment was i was using fixtoscreen before attempting to use physics. Yes im for sure sticking with setviewoffset().Blink
Quote: "My advice is not to use physics"
if i dont use physics whats some other ways to create an obstacle ? im testing something like this currently
Back to top
Profile PM
blink0k
Moderator
11
Years of Service
User Offline
Joined: 22nd Feb 2013
Location: the land of oz
Posted: 1st Jul 2020 22:20
Link
Yes. I think GetSpriteCollision() should work for you. You can use SetSpriteShape() to define the sprites collision shape
In your code i note you use SetSpritePosition() to position your sprite which will position the sprite's top left corner so your math should probably be dummyp.x = getspritex(car.id) - GetSpriteWidth(dummyp.id)
Back to top
Profile PM
dandrews
3
Years of Service
User Offline
Joined: 26th Jun 2020
Location:
Posted: 1st Jul 2020 22:52
Link
That's actually exactly what I'm doing now and it's seems to be working better. Thank you both for the help
Back to top
Profile PM
Back to top

Login to post a reply

Server time is: 2024-04-26 12:17:40
Your offset time is: 2024-04-26 12:17:40