/*******************************************************************************
* Copyright 2011 See AUTHORS file.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
package com.badlogic.gdx.physics.box2d;
import com.badlogic.gdx.math.Vector2;
/** The class manages contact between two shapes. A contact exists for each overlapping AABB in the broad-phase (except if
* filtered). Therefore a contact object may exist that has no contact points.
* @author mzechner */
public class Contact {
// @off
/*JNI
#include <Box2D/Box2D.h>
*/
/** the address **/
protected long addr;
/** the world **/
protected World world;
/** the world manifold **/
protected final WorldManifold worldManifold = new WorldManifold();
protected Contact (World world, long addr) {
this.addr = addr;
this.world = world;
}
/** Get the world manifold. */
private final float[] tmp = new float[8];
public WorldManifold getWorldManifold () {
int numContactPoints = jniGetWorldManifold(addr, tmp);
worldManifold.numContactPoints = numContactPoints;
worldManifold.normal.set(tmp[0], tmp[1]);
for (int i = 0; i < numContactPoints; i++) {
Vector2 point = worldManifold.points[i];
point.x = tmp[2 + i * 2];
point.y = tmp[2 + i * 2 + 1];
}
worldManifold.separations[0] = tmp[6];
worldManifold.separations[1] = tmp[7];
return worldManifold;
}
private native int jniGetWorldManifold (long addr, float[] tmp); /*
b2Contact* contact = (b2Contact*)addr;
b2WorldManifold manifold;
contact->GetWorldManifold(&manifold);
int numPoints = contact->GetManifold()->pointCount;
tmp[0] = manifold.normal.x;
tmp[1] = manifold.normal.y;
for( int i = 0; i < numPoints; i++ )
{
tmp[2 + i*2] = manifold.points[i].x;
tmp[2 + i*2+1] = manifold.points[i].y;
}
tmp[6] = manifold.separations[0];
tmp[7] = manifold.separations[1];
return numPoints;
*/
public boolean isTouching () {
return jniIsTouching(addr);
}
private native boolean jniIsTouching (long addr); /*
b2Contact* contact = (b2Contact*)addr;
return contact->IsTouching();
*/
/** Enable/disable this contact. This can be used inside the pre-solve contact listener. The contact is only disabled for the
* current time step (or sub-step in continuous collisions). */
public void setEnabled (boolean flag) {
jniSetEnabled(addr, flag);
}
private native void jniSetEnabled (long addr, boolean flag); /*
b2Contact* contact = (b2Contact*)addr;
contact->SetEnabled(flag);
*/
/** Has this contact been disabled? */
public boolean isEnabled () {
return jniIsEnabled(addr);
}
private native boolean jniIsEnabled (long addr); /*
b2Contact* contact = (b2Contact*)addr;
return contact->IsEnabled();
*/
/** Get the first fixture in this contact. */
public Fixture getFixtureA () {
return world.fixtures.get(jniGetFixtureA(addr));
}
private native long jniGetFixtureA (long addr); /*
b2Contact* contact = (b2Contact*)addr;
return (jlong)contact->GetFixtureA();
*/
/** Get the second fixture in this contact. */
public Fixture getFixtureB () {
return world.fixtures.get(jniGetFixtureB(addr));
}
private native long jniGetFixtureB (long addr); /*
b2Contact* contact = (b2Contact*)addr;
return (jlong)contact->GetFixtureB();
*/
/** Get the child primitive index for fixture A. */
public int getChildIndexA () {
return jniGetChildIndexA(addr);
}
private native int jniGetChildIndexA (long addr); /*
b2Contact* contact = (b2Contact*)addr;
return contact->GetChildIndexA();
*/
/** Get the child primitive index for fixture B. */
public int getChildIndexB () {
return jniGetChildIndexB(addr);
}
private native int jniGetChildIndexB (long addr); /*
b2Contact* contact = (b2Contact*)addr;
return contact->GetChildIndexB();
*/
/** Override the default friction mixture. You can call this in b2ContactListener::PreSolve. This value persists until set or
* reset. */
public void setFriction (float friction) {
jniSetFriction(addr, friction);
}
private native void jniSetFriction (long addr, float friction); /*
b2Contact* contact = (b2Contact*)addr;
contact->SetFriction(friction);
*/
/** Get the friction. */
public float getFriction () {
return jniGetFriction(addr);
}
private native float jniGetFriction (long addr); /*
b2Contact* contact = (b2Contact*)addr;
return contact->GetFriction();
*/
/** Reset the friction mixture to the default value. */
public void resetFriction () {
jniResetFriction(addr);
}
private native void jniResetFriction (long addr); /*
b2Contact* contact = (b2Contact*)addr;
contact->ResetFriction();
*/
/** Override the default restitution mixture. You can call this in b2ContactListener::PreSolve. The value persists until you set
* or reset. */
public void setRestitution (float restitution) {
jniSetRestitution(addr, restitution);
}
private native void jniSetRestitution (long addr, float restitution); /*
b2Contact* contact = (b2Contact*)addr;
contact->SetRestitution(restitution);
*/
/** Get the restitution. */
public float getRestitution () {
return jniGetRestitution(addr);
}
private native float jniGetRestitution (long addr); /*
b2Contact* contact = (b2Contact*)addr;
return contact->GetRestitution();
*/
/** Reset the restitution to the default value. */
public void ResetRestitution () {
jniResetRestitution(addr);
}
private native void jniResetRestitution (long addr); /*
b2Contact* contact = (b2Contact*)addr;
contact->ResetRestitution();
*/
/** Get the tangent speed. */
public float getTangentSpeed () {
return jniGetTangentSpeed(addr);
}
private native float jniGetTangentSpeed (long addr); /*
b2Contact* contact = (b2Contact*)addr;
return contact->GetTangentSpeed();
*/
/** Set the tangent speed. */
public void setTangentSpeed (float speed) {
jniSetTangentSpeed(addr, speed);
}
private native void jniSetTangentSpeed (long addr, float speed); /*
b2Contact* contact = (b2Contact*)addr;
contact->SetTangentSpeed(speed);
*/
}