image moving

Java on Mobile Devices J2ME
#1

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.

#2

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.

#3

[quote]i use delay in canvas class its giving error
[/quote]
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:

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
		}
	}
#4

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:

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
		}
	}

[/quote]
currentTimeMilis() is not accurate on windows. nanoTime() is better.