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How to draw enemy death animation if its collision is valid

Nick · 2013-05-12T04:15:54

My game loop is structured like this: update draw checkforcollision sleep I want to draw the death animation in my draw method but the problem is by the time I check for collision, the draw method already been executed which means it won't execute this draw code in my Ghost class. // if ghost is in a dead state if(getDeadState()) { g.drawImage(ghostMovementAnimation.get(3), (int)position.getX(), (int)position.getY(), null); } The code posted below is in my Laser class. Quick explanation of my collision code: if collision is valid, remove the laser set monster dead state to be true remove the monster /* check the intersection of the laser's rectangle and all the monster's * rectangle. If both rectangles intersects, it is a collision */ if(rectangle.intersects(((Collidable) component).getRectangle())) { // remove laser upon monster contact Game.getInstance().remove(this); // set monster to be dead monsterIsDead = true; // set monster to be dead ((Monster) component).setDeadState(monsterIsDead); // remove the monster upon contact of the laser Game.getInstance().remove(component);

General and Gameplay Programming Programming

Started by Nicholas Kong May 11, 2013 03:11 AM

11 comments, last by Nicholas Kong 10 years, 11 months ago

VladR

722

May 11, 2013 11:29 PM

You definitely need two separates states in your FiniteStateMachine:


enum EnemyState
{
.....
Dying,
Dead,
.......
};

The Logic to make sure you handle the switch to Dying status just once (even if the laser will be on screen few more seconds):


if (Is_There_Collision_Of_Laser_With_Enemy ())
  if ((EnemyStatus !=Dying) && (EnemyStatus != Dead))
  {
    EnemyStatus = stDying;
    Start_Dying_Animation (Time_Of_Current_Frame, Length_Of_Dying_Animation)
  }

.....

Now you need to switch from Dying to Dead, when Dying animation is over in the place where you handle the states:


if (EnemyStatus == Dying)
{
  if (Time_Of_Current_Frame >= Time_End_Of_Dying_Animation)
  {
    EnemyStatus = Dead;
  }
}

VladR My 3rd person action RPG on GreenLight: http://steamcommunity.com/sharedfiles/filedetails/?id=92951596

dmatter

4,872

May 12, 2013 01:18 AM

warnexus, on 11 May 2013 - 06:09, said:
I am having trouble figuring out how to make it a few seconds pass as a condition to trigger the removal of the monster.

You must know when the death animation finishes though? I.e. How many frames (or milliseconds) the animation requires/has-remaining before it finishes.

I think the point is that you need to model the state transitions as a kind of state in its own right, e.g. moving between being "alive" to being "dead" involves a state-transition called "dying". So a monster gets hit by a laser, it enters into a "dying" state; your update logic will respond to that state by playing the death animation. Once the animation completes your update logic removes the monster (or if the monster should just hang around being dead then you set it to a "dead" state).

David Gill :: GitHub :: twitter .

Nicholas Kong

1,535

Author

May 12, 2013 04:15 AM

warnexus, on 11 May 2013 - 06:09, said:
I am having trouble figuring out how to make it a few seconds pass as a condition to trigger the removal of the monster.

You must know when the death animation finishes though? I.e. How many frames (or milliseconds) the animation requires/has-remaining before it finishes.

I think the point is that you need to model the state transitions as a kind of state in its own right, e.g. moving between being "alive" to being "dead" involves a state-transition called "dying". So a monster gets hit by a laser, it enters into a "dying" state; your update logic will respond to that state by playing the death animation. Once the animation completes your update logic removes the monster (or if the monster should just hang around being dead then you set it to a "dead" state).

Thanks for the ideas! I got it to work!

Why is there a -1?

How to draw enemy death animation if its collision is valid

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