Hi !
Featured games (90)
games approved by the League of Dukes
Games in Showcase (715)
Games in Android Showcase (214)
games submitted by our members
Games in WIP (788)
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  
  collision between polygons  (Read 1870 times)
0 Members and 1 Guest are viewing this topic.
Offline jaqob

Innocent Bystander

Java games rock!

« Posted 2003-02-28 05:52:53 »

How do i check if two polygons hit each other?

like polygon1.contains(polygon2)

I cant find any Method in the api that does that
Offline ryanm

Senior Devvie

Projects: 1
Exp: 15 years

Used to be bleb

« Reply #1 - Posted 2003-02-28 06:47:01 »

The easiest way is to check all the vertices of one polygon to see if they lie inside the other polygon using the contains( x, y ) method.

However, this method is slow O( n * m ), where poly1 has n vertices and poly2 has m vertices, and can give an incorrect result ( think about two triangles in a star of David type formation ).

The more complex way is use a sweep-line strategy to check if any of the polygon edges intersect.  This method will find all cases of polygon intersection and runs in O( p * log p ) , where p = n + m.

If you google for "line intersection" and "sweep line" something may turn up.  It is also detailed in "Introduction to Algorithms" by three guys whos names i can't remember???, but their initials were C, L and R Tongue

If you don't find anything, come back here and I'll put up an explanation about how it works when i have more time.
Pages: [1]
  ignore  |  Print  
You cannot reply to this message, because it is very, very old.

CopyableCougar4 (149 views)
2017-03-24 15:39:42

theagentd (132 views)
2017-03-24 15:32:08

Rule (189 views)
2017-03-19 12:43:22

Rule (177 views)
2017-03-19 12:42:17

Rule (180 views)
2017-03-19 12:36:21

theagentd (198 views)
2017-03-16 05:07:07

theagentd (193 views)
2017-03-15 22:37:06

theagentd (152 views)
2017-03-15 22:32:18

theagentd (146 views)
2017-03-15 22:31:11

ral0r2 (161 views)
2017-03-03 11:52:41
List of Learning Resources
by elect
2017-03-13 14:05:44

List of Learning Resources
by elect
2017-03-13 14:04:45

SF/X Libraries
by philfrei
2017-03-02 08:45:19

SF/X Libraries
by philfrei
2017-03-02 08:44:05

SF/X Libraries
by SkyAphid
2017-03-02 06:38:56

SF/X Libraries
by SkyAphid
2017-03-02 06:38:32

SF/X Libraries
by SkyAphid
2017-03-02 06:38:05

SF/X Libraries
by SkyAphid
2017-03-02 06:37:51 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‑
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!