GREENFOOT ACTOR API UPDATE

or at a coarser frequency if you prefer, since it changes state infrequently. 2, Juni 2017, 213 - 222 Tahap selanjutnya setelah mengubah background kemudian menambahkan actor kedalam scenario. 217 INFORMATION MANAGEMENT FOR EDUCATORS AND PROFESSIONALS Vol.1, No. Call this periodically, say once per frame update, Syahbaniar Rofiah II Pengenalan Greenfoot Dalam. NextWaveSpawnTime = System.nanoTime() + 1000000000 That might look something like this: // Call this at the start of your level. Instead, what you really want to do is call this function periodically, and each time check if it's time to spawn a new wave, rather than hold the CPU hostage until it's time. So, don't put a wait loop inside your game loop. i is still less than 3, so we're stil not allowing the CPU to move on yet! Back to step 3 we go, and burn another second doing nothing. Actor subclasses are objects that can exist and act in the world.

Programming a scenario, therefore, consists mainly of implementing act methods for the scenarios actors. We hit the end of the while loop and check the condition again. Greenfoot offers API methods for a range of common tasks, such as animation, sound, randomisation, and image manipulation. You've effectively stalled your game here.įinally, an eternity of wasted CPU time later, we've managed to burn a second of time and our inner if condition finally passes.

GREENFOOT ACTOR API UPDATE

This is called a ' busy-wait' or 'spinning' - the processor is kept busy checking the clock then looping then re-checking the clock, so it's never allowed to exit this loop, return from this function, update the rest of your game state, process player input, or draw a frame. We keep doing this BILLIONS of times, because we do so little work inside the loop each time, nanoTime isn't much bigger each time we loop around. i is still less than 3, so we re-enter the loop and go back to step 3. We hit the end of the while loop, and check the condition again. We check if the current time is 1 second later than begin time yet, but of course it isn't! We've barely executed two instructions since begin time.

We check the while loop's condition, and i is indeed less than 3, so we enter the loop. Let's walk through this code, pretending that nanoTime = 0 at the start for simplicity.

Greenfoot actor api