Java-Gaming.org Hi !
 Featured games (84) games approved by the League of Dukes Games in Showcase (604) Games in Android Showcase (171) games submitted by our members Games in WIP (652) games currently in development
 News: Read the Java Gaming Resources, or peek at the official Java tutorials
Pages: [1]
 ignore  |  Print
 Help with collision detection  (Read 701 times) 0 Members and 1 Guest are viewing this topic.
Kebo

Junior Newbie

Java games rock!

 « Posted 2005-12-21 00:51:41 »

Hi, i could really use some help with the collison detection for my tile game. There are alot of problem with this algorithm but my mainproblem is when the hero is standing on top off a block i cant get him to fall off. He keeps floating away in the air when he should start falling. I also got trouble figuring out how to move when he jumps and hits the bottom of a block and should start falling back. Any help to optimize this and general tips is very appriciated!

 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  36  37  38  39  40  41  42  43  44  45  46  47  48  49  50  51  52  53  54  55  56 `   public void move(long delta){            if(jumping){         dy = dy + gravity;      }            float newx = (dx * delta) / 1000;      float newy = (dy * delta) / 1000;            Rectangle me = new Rectangle(            (int)(x + newx),             (int)(y + newy),             (int)(getWidth()),             (int)(getHeight())      );            Rectangle block = new Rectangle(            (int)(25*16),             (int)(29*16),             (int)16,             (int)16      );            if(y + getHeight() > Game.SCREEN_HEIGHT){         dy = 0;         newy = 0;         jumping = false;         y = Game.SCREEN_HEIGHT - getHeight();      }                  if(me.intersects(block)){         if(newx > 0){            x = (float)block.getX() - getWidth();            newx = 0;         }         else if(newx < 0){            x = (float)block.getX() + 16;            newx = 0;         }         if(newy > 0){            y = (float)block.getY() - getHeight();            jumping = false;            newy = 0;            dy = 0;                     }         else if(newy < 0){            y = (float)block.getMaxY() + 16;            newy = -(newy);         }      }            x += newx;      y += newy;   }`

Junior Devvie

Java games rock!

 « Reply #1 - Posted 2005-12-21 22:11:09 »

It's very difficult to understand what the code is supposed to do by just looking at the code. You could explain how it is supposed to work, and how exactly the current implementation differs from that. For example it is difficult to assess the function of the "jumping" boolean: is it supposed to be true whenever the entity is in the air or just in the moment that the entity is jumping (i.e. not while falling down again)?

As for optimization, you may want to avoid creating new Rectangles every time that method is executed. Store two rectangles and load data into them as needed.
Pages: [1]
 ignore  |  Print

You cannot reply to this message, because it is very, very old.

 SHC (22 views) 2015-08-01 03:58:20 Jesse (19 views) 2015-07-29 04:35:27 Riven (39 views) 2015-07-27 16:38:00 Riven (21 views) 2015-07-27 15:35:20 Riven (24 views) 2015-07-27 12:26:13 Riven (14 views) 2015-07-27 12:23:39 BurntPizza (35 views) 2015-07-25 00:14:37 BurntPizza (46 views) 2015-07-24 22:06:39 BurntPizza (28 views) 2015-07-24 06:06:53 NoxInc (36 views) 2015-07-22 22:16:53
 theagentd 51x wessles 45x basil_ 35x KaiHH 26x orangepascal 26x ags1 21x Riven 19x mooman219 17x bornander 14x KudoDEV 13x CelestialCreator 11x princec 11x klaus 11x Jesse 10x pquiring 9x Zaneris 9x
 List of Learning Resourcesby gouessej2015-07-09 11:29:36How Do I Expand My Game?by bashfrog2015-06-14 11:34:43List of Learning Resources2015-05-31 05:37:30Intersection Methodsby Roquen2015-05-29 08:19:33List of Learning Resources2015-05-05 10:20:32How to: JGO Wikiby Mac702015-02-17 20:56:162D Dynamic Lighting2015-01-01 20:25:42How do I start Java Game Development?by gouessej2014-12-27 19:41:21
 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