Java-Gaming.org Hi !
Featured games (83)
games approved by the League of Dukes
Games in Showcase (522)
Games in Android Showcase (127)
games submitted by our members
Games in WIP (590)
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  
  [LibGDX]Pixel perfect collision with flipped images  (Read 155 times)
0 Members and 1 Guest are viewing this topic.
Offline P0jahn

Senior Devvie


Projects: 3



« Posted 2014-08-20 16:33:27 »

I have a pixel perfect method that works fine except when one or more of the images are flipped(or rotated, but I wont fix that).

1  
2  
3  
4  
5  
6  
7  
8  
9  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
   public static boolean pixelPerfect(GameObject obj1, GameObject obj2)
   {  
      Image2D image1 = obj1.getImage();
      Image2D image2 = obj2.getImage();
     
      int top      = (int) Math.max(obj1.currY, obj2.currY);
      int bottom   = (int) Math.min(obj1.currY + obj1.height, obj2.currY + obj2.height);
      int left     = (int) Math.max(obj1.currX, obj2.currX);
      int right    = (int) Math.min(obj1.currX + obj1.width, obj2.currX + obj2.width);
     
      boolean flipped1 = image1.isFlipX();
      boolean flipped2 = image2.isFlipX();

      for (int y = top; y < bottom; y++)
      {
         for (int x = left; x < right; x++)
         {
            int colorA;
            int colorB;
           
            if(flipped1)
               colorA = //TODO
            else
               colorA = image1.getColor((int) (x - obj1.currX), (int) (y - obj1.currY));
            if(flipped2)
               colorB = //TODO
            else
               colorB = image2.getColor((int) (x - obj2.currX), (int) (y - obj2.currY));
           
            if (colorA != 0 && colorB != 0)
               return true;
         }
      }
      return false;
   }


How do I calculate the current pixel to check if the image is flipped horizontally?
Offline lcass
« Reply #1 - Posted 2014-08-20 17:20:25 »

So the issue is coming up when you flip the object? I think it may be coming from when you calculate the corners of your object . You add the object width , when flipped it could just shift the shape over.
Pages: [1]
  ignore  |  Print  
 
 

 

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

The first screenshot will be displayed as a thumbnail.

trollwarrior1 (34 views)
2014-11-22 12:13:56

xFryIx (73 views)
2014-11-13 12:34:49

digdugdiggy (52 views)
2014-11-12 21:11:50

digdugdiggy (46 views)
2014-11-12 21:10:15

digdugdiggy (40 views)
2014-11-12 21:09:33

kovacsa (66 views)
2014-11-07 19:57:14

TehJavaDev (70 views)
2014-11-03 22:04:50

BurntPizza (68 views)
2014-11-03 18:54:52

moogie (83 views)
2014-11-03 06:22:04

CopyableCougar4 (82 views)
2014-11-01 23:36:41
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

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