Java-Gaming.org Hi !
Featured games (83)
games approved by the League of Dukes
Games in Showcase (541)
Games in Android Showcase (133)
games submitted by our members
Games in WIP (603)
games currently in development
News: Read the Java Gaming Resources, or peek at the official Java tutorials
 
    Home     Help   Search   Login   Register   
Pages: [1]
  ignore  |  Print  
  Vector acceleration based on angle?  (Read 1510 times)
0 Members and 1 Guest are viewing this topic.
Offline CyanPrime
« Posted 2011-06-02 03:10:26 »

How can I accelerate something yet have it move in it's angle?

1  
2  
Vector2f pos = new Vector2f(250,250);
float angle = 145;


Now I also got velo and accel
1  
2  
Vector2f velo = new Vector2f(0,0);
Vector2f accel = new Vector2f(1,1);


Now to accelerate I add accel to velo, then each time I move by adding velo to pos, but how do I make it so velo takes the angle into account? for example if you were to be at angle 45 and press the go button you would start moving at a velo of (1,-1) and that velo would be increased by (1,-1) for each pass that you hold the go button; However, if you were at angle 145 the velo and increase would be (1,1).


Offline ra4king

JGO Kernel


Medals: 356
Projects: 3
Exp: 5 years


I'm the King!


« Reply #1 - Posted 2011-06-02 04:38:14 »

You should instead have a speed variable. Velocity is speed + angle (by using the deltaX and the deltaY). If you want a velocity vector, all you need to do is add the acceleration to it, then add it to the position. Otherwise, you could have a speed and angle variable and use trig to find the deltaX and deltaY:
1  
2  
pos.x += velocity * Math.cos(Math.toRadians(angle));
pos.y += velocity * Math.sin(Math.toRadians(angle));


EDIT: Fixed the wording. Cheesy

Offline CyanPrime
« Reply #2 - Posted 2011-06-02 04:58:09 »

Thank you. Grin
Games published by our own members! Check 'em out!
Legends of Yore - The Casual Retro Roguelike
Offline dishmoth
« Reply #3 - Posted 2011-06-02 05:50:23 »

Velocity is a scalar value. You don't see 2 different speedometers while driving a car do you?
You should probably read up on the difference between speed and velocity.

Offline ra4king

JGO Kernel


Medals: 356
Projects: 3
Exp: 5 years


I'm the King!


« Reply #4 - Posted 2011-06-02 06:24:52 »

Velocity is a scalar value. You don't see 2 different speedometers while driving a car do you?
You should probably read up on the difference between speed and velocity.
Ah yes thank you, I misused the terms.

Pages: [1]
  ignore  |  Print  
 
 
You cannot reply to this message, because it is very, very old.

 

Add your game by posting it in the WIP section,
or publish it in Showcase.

The first screenshot will be displayed as a thumbnail.

Mr.CodeIt (24 views)
2014-12-23 03:34:11

rwatson462 (55 views)
2014-12-15 09:26:44

Mr.CodeIt (46 views)
2014-12-14 19:50:38

BurntPizza (91 views)
2014-12-09 22:41:13

BurntPizza (113 views)
2014-12-08 04:46:31

JscottyBieshaar (83 views)
2014-12-05 12:39:02

SHC (92 views)
2014-12-03 16:27:13

CopyableCougar4 (101 views)
2014-11-29 21:32:03

toopeicgaming1999 (160 views)
2014-11-26 15:22:04

toopeicgaming1999 (163 views)
2014-11-26 15:20:36
Resources for WIP games
by kpars
2014-12-18 10:26:14

Understanding relations between setOrigin, setScale and setPosition in libGdx
by mbabuskov
2014-10-09 22:35:00

Definite guide to supporting multiple device resolutions on Android (2014)
by mbabuskov
2014-10-02 22:36:02

List of Learning Resources
by Longor1996
2014-08-16 10:40:00

List of Learning Resources
by SilverTiger
2014-08-05 19:33:27

Resources for WIP games
by CogWheelz
2014-08-01 16:20:17

Resources for WIP games
by CogWheelz
2014-08-01 16:19:50

List of Learning Resources
by SilverTiger
2014-07-31 16:29:50
java-gaming.org is not responsible for the content posted by its members, including references to external websites, and other references that may or may not have a relation with our primarily gaming and game production oriented community. inquiries and complaints can be sent via email to the info‑account of the company managing the website of java‑gaming.org
Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines | Managed by Enhanced Four Valid XHTML 1.0! Valid CSS!