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 Collision Detection with some Rectangles  (Read 941 times) 0 Members and 1 Guest are viewing this topic.

Junior Newbie

 « Posted 2012-09-18 13:08:42 »

Hey everyone,
I started learning Java some weeks ago and tried to make a little game. It should be like this game.
I made some walls using rectangles and also a little ball. The collision works really great, but only with one rectangle, wich I wrote in the code like this:
 1  2  3  4  5  6  7  8  9  10 `public void checkCollision(){            player = new Rectangle(player.x,player.y,player.width,player.height);            rect = floor_mid;      if (player.intersects(rect)){         stopMovement();         setOffWall(rect);      }   }`

And the rectangles i'm using:
 1  2  3  4  5  6  7  8 `           public Rectangle floor_south;   public Rectangle floor_north;   public Rectangle floor_east;   public Rectangle floor_west;   public Rectangle floor_mid;      public Rectangle player;`

How can I code it so the player would stop on every rectangle?
Embedded

Junior Devvie

Medals: 1

 « Reply #1 - Posted 2012-09-18 13:22:49 »

You could put all the Rectangles into an array of rectangles then you can go through them all in a for loop e.g.
 1  2  3  4  5  6 `for(int i = 0; i < rectangles.length(); i++){       if(player.intersects(rectangles[i])){         stopMovement();         setOffWall(rect);       }}`

Junior Newbie

 « Reply #2 - Posted 2012-09-18 13:28:44 »

You could put all the Rectangles into an array of rectangles then you can go through them all in a for loop e.g.
 1  2  3  4  5  6 `for(int i = 0; i < rectangles.length(); i++){       if(player.intersects(rectangles[i])){         stopMovement();         setOffWall(rect);       }}`

How do I do an array of recangles?
aazimon
 « Reply #3 - Posted 2012-09-18 17:33:02 »

Like this: Rectangle[] rectangles = new Rectangles[1];
I would recommend creating an ArrayList instead. Like this: ArrayList<Rectangle> rectangles = new ArrayList<Rectangle>(), that way you don't have to know the number of Rectangles at the beginning. You just keep adding Rectangles you need for collision detection to the list. Then you can iterator through the list.
 1  2  3  4  5 `Iterator iter = rectangles.iterator();while (iter.hasNext()) {Rectangle rectangle = iter.next();// Do your stuff here}`

Regards,
sproingie

JGO Kernel

Medals: 202

 « Reply #4 - Posted 2012-09-18 17:37:35 »

Unless you actually need the iterator object (such as to remove things), you ought to use foreach syntax:
 1  2  3 `for (Rectangle r: rectangles) {   // do stuff here}`
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