Java-Gaming.org    
Featured games (81)
games approved by the League of Dukes
Games in Showcase (495)
Games in Android Showcase (114)
games submitted by our members
Games in WIP (563)
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  
  Rotating A Point  (Read 814 times)
0 Members and 1 Guest are viewing this topic.
Offline DDDBOMBER

Junior Member


Projects: 1



« Posted 2013-03-01 22:22:41 »

I am rotating a sprite in game around the center, and need to find out where a certain point is, from the original, so for example in the original a point at (1, 1) on the 64 x 128 image. I need to find that point after the rotation. I am using slick2d as my graphics library
Offline cubemaster21
« Reply #1 - Posted 2013-03-01 22:26:16 »

This is what I use to rotate points, only I use Vector2D, but it works the same way.
1  
2  
3  
4  
5  
6  
7  
8  
9  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
   public static Vector2D rotate(Vector2D origin,Vector2D point, double theta){
      double s = Math.sin(theta);
      double c = Math.cos(theta);
      // get the deltaX and deltaY
     point.x -= origin.x;  
       point.y -= origin.y;  

       // rotate point  
        double xnew = point.x * c - point.y * s;  
       double ynew = point.x * s + point.y * c;

       // translate point back to global coords:
      Vector2D TranslatedPoint = new Vector2D(0,0);
       TranslatedPoint.x = xnew + origin.x;  
       TranslatedPoint.y = ynew + origin.y;

       return TranslatedPoint;
       
   }

Check out my game, Viking Supermarket Smash
http://www.java-gaming.org/topics/iconified/28984/view.html
Offline DDDBOMBER

Junior Member


Projects: 1



« Reply #2 - Posted 2013-03-01 22:43:24 »

Oh cool thanks, i found a way like this of wikipedia's rotation page, but thanks for the help anyways
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.

Dwinin (28 views)
2014-09-12 09:08:26

Norakomi (57 views)
2014-09-10 13:57:51

TehJavaDev (74 views)
2014-09-10 06:39:09

Tekkerue (37 views)
2014-09-09 02:24:56

mitcheeb (57 views)
2014-09-08 06:06:29

BurntPizza (44 views)
2014-09-07 01:13:42

Longarmx (27 views)
2014-09-07 01:12:14

Longarmx (34 views)
2014-09-07 01:11:22

Longarmx (34 views)
2014-09-07 01:10:19

mitcheeb (40 views)
2014-09-04 23:08:59
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

List of Learning Resources
by SilverTiger
2014-07-31 16:26:06

List of Learning Resources
by SilverTiger
2014-07-31 11:54:12

HotSpot Options
by dleskov
2014-07-08 01:59:08
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!