// Applies filter to ALL fixtures that have been added so far
public void setFilter(short category, short mask) {
for (Fixture f : scene.getFixtures()) {
Filter filter = f.getFilterData();
filter.categoryBits = category;
filter.maskBits = mask;
f.setFilterData(filter);
}
}
/**
* Method is called on end of every collision between two Box2D bodies. Behaviour of the end of
* certain body collisions are defined in this method. Collisions between bodies are defined and
* accessed by means of bitwise or-ing their category bits.
*/
@Override
public void endContact(Contact c) {
Fixture fa = c.getFixtureA();
Fixture fb = c.getFixtureB();
int collisionDefinition = fa.getFilterData().categoryBits | fb.getFilterData().categoryBits;
switch (collisionDefinition) {
// foot sensor breaks from floor
case B2DVars.BIT_PLAYER_FOOT | B2DVars.BIT_BLOCKS:
numJumps--;
break;
// player breaks from end level region
case B2DVars.BIT_PLAYER | B2DVars.BIT_END:
break;
}
}
private static boolean contactFilter(Fixture fixture, Filter filterA) {
if (filterA == null) return true;
Filter filterB = fixture.getFilterData();
if (filterA.groupIndex != 0 && filterA.groupIndex == filterB.groupIndex)
return filterA.groupIndex > 0;
return (filterA.maskBits & filterB.categoryBits) != 0
&& (filterA.categoryBits & filterB.maskBits) != 0;
}
/**
* Method is called on every collision between two Box2D bodies. Behaviour of certain body
* collisions are defined in this method. Collisions between bodies are defined and accessed by
* means of bitwise or-ing their category bits.
*/
@Override
public void beginContact(Contact c) {
Fixture fa = c.getFixtureA();
Fixture fb = c.getFixtureB();
int collisionDefinition = fa.getFilterData().categoryBits | fb.getFilterData().categoryBits;
switch (collisionDefinition) {
// foot collides with floor
case B2DVars.BIT_PLAYER_FOOT | B2DVars.BIT_BLOCKS:
numJumps++;
break;
// Player collides with student, deal damage to player or kill enemy
case B2DVars.BIT_PLAYER | B2DVars.BIT_STUDENT:
System.out.println("hit!");
playerStudentCollisionCount++;
Vector2 playerPosition, playerVelocity, studentPosition;
Body player, student;
if (fa.getUserData().equals("player")) {
player = fa.getBody();
playerPosition = fa.getBody().getPosition();
playerVelocity = fa.getBody().getLinearVelocity();
student = fb.getBody();
studentPosition = fb.getBody().getPosition();
} else {
player = fb.getBody();
playerPosition = fb.getBody().getPosition();
playerVelocity = fb.getBody().getLinearVelocity();
student = fa.getBody();
studentPosition = fa.getBody().getPosition();
}
// Player hits enemy from above, 0.1 offset is to ensure player is significantly above enemy
if (playerPosition.y - 0.1 > studentPosition.y && playerVelocity.y <= 0) {
Game.ass.getAudio("kill").play(1.0f);
bodiesToKill.add(student);
player.setLinearVelocity(player.getLinearVelocity().x, 2f);
} else {
((Player) player.getUserData()).damagePlayer();
Game.ass.getAudio("hit").play(1.0f);
Vector2 point = new Vector2(playerPosition.x, playerPosition.y);
if (playerPosition.x < studentPosition.x) {
player.applyLinearImpulse(new Vector2(-30f, 0), point, true);
} else {
player.applyLinearImpulse(new Vector2(30f, 0), point, true);
}
}
break;
// player collides with coin
case B2DVars.BIT_PLAYER | B2DVars.BIT_COINS:
if (fa.getUserData().equals("coin")) {
// delete coin
bodiesToKill.add(fa.getBody());
Game.ass.getAudio("coin").play(1.0f);
} else {
bodiesToKill.add(fb.getBody());
Game.ass.getAudio("coin").play(1.0f);
}
break;
// player collides with end of level region
case B2DVars.BIT_PLAYER | B2DVars.BIT_END:
if (fa.getUserData().equals("end")) {
Player playerB = (Player) fb.getBody().getUserData();
if (playerB.getNumCoins() == playerB.getNumCoinsToCollect()) {
playerB.setLevelCompleteBool(true);
break;
}
playerB.setLevelCompleteBool(false);
break;
} else {
Player playerA = (Player) fa.getBody().getUserData();
if (playerA.getNumCoins() == playerA.getNumCoinsToCollect()) {
playerA.setLevelCompleteBool(true);
break;
}
playerA.setLevelCompleteBool(false);
break;
}
}
}