Java-Gaming.org Hi !
Featured games (83)
games approved by the League of Dukes
Games in Showcase (539)
Games in Android Showcase (132)
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  
  Checking collision between a Shap and a Rectangle  (Read 653 times)
0 Members and 1 Guest are viewing this topic.
Offline Fiskpotatis

Junior Newbie





« Posted 2013-05-18 12:33:06 »

In my game the player uses a Rectangle for his bounding box, he can do this because I only need to rotate the player image and not the acctual rectangle but for a eletric beam that one of the bosses have I need to use a Shape because I need to rotate the acctual bounding box and not only the image. The problem is that because I have one Rectangle and one Shape I can't use rectangle.intersect(shape) nor rectangle.intersect((Rectangle)shape), I also can't use the Shapes getBounds() method because that woud defeat the purpose of using a Shape so how would I be able to check the collision between the rectangle and the shape? or is there a way that I can rotate a rectangle on instead of a shape (I use the createTransformedShape instance of an AffineTransform to rotate the shape )?
Offline relminator
« Reply #1 - Posted 2013-05-18 14:07:35 »

SAT.

back2basic.phatcode.net/?Issue_%231:2D_Convex_Polygon_Collision_using_SAT

Also, because your shapes are just rotated boxes, you can optimize it further by projecting 1/2 of the edges.
Offline opiop65

JGO Kernel


Medals: 161
Projects: 7
Exp: 4 years


JumpButton Studios


« Reply #2 - Posted 2013-05-18 14:13:59 »

Fix the link?

Games published by our own members! Check 'em out!
Legends of Yore - The Casual Retro Roguelike
Offline relminator
« Reply #3 - Posted 2013-05-18 14:31:21 »

Fix the link?

Sorry using phone right now.
Offline opiop65

JGO Kernel


Medals: 161
Projects: 7
Exp: 4 years


JumpButton Studios


« Reply #4 - Posted 2013-05-18 14:32:47 »

No problem, I got it
back2basic.phatcode.net/?Issue_%231:2D_Convex_Polygon_Collision_using_SAT

Offline Andre Lopes
« Reply #5 - Posted 2013-05-19 01:54:39 »

Seems a little complicated. I will print and study that because, well, it seems fun.

Thought, i wonder if theres an easier way without much precision. Tongue
Offline DrZoidberg

Senior Devvie


Medals: 17



« Reply #6 - Posted 2013-05-19 11:40:03 »

Sure, you can use java.awt.geom.Area
To test if 2 arbitrary shapes intersect you just have to do this
1  
2  
3  
Area area = new Area(shape1);
area.intersect(new Area(shape2));
boolean isIntersecting = !area.isEmpty();

You can even test how much they intersect with area.getBounds2D().
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.

rwatson462 (30 views)
2014-12-15 09:26:44

Mr.CodeIt (23 views)
2014-12-14 19:50:38

BurntPizza (50 views)
2014-12-09 22:41:13

BurntPizza (84 views)
2014-12-08 04:46:31

JscottyBieshaar (45 views)
2014-12-05 12:39:02

SHC (59 views)
2014-12-03 16:27:13

CopyableCougar4 (57 views)
2014-11-29 21:32:03

toopeicgaming1999 (123 views)
2014-11-26 15:22:04

toopeicgaming1999 (114 views)
2014-11-26 15:20:36

toopeicgaming1999 (32 views)
2014-11-26 15:20:08
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!