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  image moving  (Read 2582 times)
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Offline lenin1

Junior Newbie





« Posted 2006-05-12 14:20:30 »

Hi,
Iam need of help,my problem is iam constructing a brick game,in this game we have bricks with 3 diff colors they needs to be moving on the screen from top to bottom of canvas class and if we arrange the same colored bricks in a row it must be added to the score,but the problem is when iam trying to move the image from  top to bottom its moving at time to down,so i need help to move the image with the controled speed but if i use delay in canvas class its giving error or if i use threads its not controling and if i use thread in the canvas class iam getting error.
Offline Riven
Administrator

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« Reply #1 - Posted 2006-05-12 14:23:35 »

What kinda of error?

1. compile-time-error
2. runtime-time-error

Give the name of the error, and if it is a runtime-error, also give the stacktrace.


Maybe even better to show some *relevant* code (not more than 20 lines) so that we know what you are actually doing.

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Offline Juriy

Junior Devvie





« Reply #2 - Posted 2006-05-12 16:34:28 »

Quote
i use delay in canvas class its giving error

As far as I know, System.currentTimeMills() is rather exact in J2ME...
So you can rely on it, while implementing bricks movement.

try to do something like this:

   
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private long lastUpdateTime;
   private final static int MOVE_TIMER = 300;

   public void moveBrick(){
      if (System.currentTimeMillis() - lastUpdateTime > MOVE_TIMER){
         lastUpdateTime = System.currentTimeMillis();
         
         // ... move-your-brick-code goes here
      }
   }

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Offline Coinerson

Junior Devvie




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« Reply #3 - Posted 2006-06-07 20:38:40 »

Quote
i use delay in canvas class its giving error

As far as I know, System.currentTimeMills() is rather exact in J2ME...
So you can rely on it, while implementing bricks movement.

try to do something like this:

   
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private long lastUpdateTime;
   private final static int MOVE_TIMER = 300;

   public void moveBrick(){
      if (System.currentTimeMillis() - lastUpdateTime > MOVE_TIMER){
         lastUpdateTime = System.currentTimeMillis();
         
         // ... move-your-brick-code goes here
      }
   }


currentTimeMilis() is not accurate on windows. nanoTime() is better.
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