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support library for libGDX (box2d module)
/** Copyright 2014 Robin Stumm ([email protected], http://dermetfan.net)
*
* 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 net.dermetfan.gdx.physics.box2d;
import com.badlogic.gdx.InputAdapter;
import com.badlogic.gdx.graphics.Camera;
import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.math.Vector3;
import com.badlogic.gdx.physics.box2d.Body;
import com.badlogic.gdx.physics.box2d.Fixture;
import com.badlogic.gdx.physics.box2d.JointDef;
import com.badlogic.gdx.physics.box2d.QueryCallback;
import com.badlogic.gdx.physics.box2d.joints.MouseJoint;
import com.badlogic.gdx.physics.box2d.joints.MouseJointDef;
import com.badlogic.gdx.utils.Array;
/** an {@link InputAdapter} managing a {@link MouseJoint}
* @author dermetfan */
public class MouseJointAdapter extends InputAdapter {
/** Manages {@link MouseJointAdapter MouseJointAdapters} by creating new ones if necessary. Override {@link #newMouseJointAdapter(byte)} to define how now ones will be created (by default a copy of the enclosing instance).
* @author dermetfan */
public class Manager extends InputAdapter {
/** the {@link MouseJointAdapter MouseJointAdapters} */
private Array adapters = new Array<>(false, 2);
/** the max size of {@link #adapters} */
private byte max = -1;
/** a temporary variable */
private boolean tmp;
/** calls {@link MouseJointAdapter#touchDown(int, int, int, int) touchDown} on all {@link #adapters} and creates a new one if necessary */
@Override
public boolean touchDown(int screenX, int screenY, int pointer, int button) {
if(adapters.size <= pointer && (pointer + 1 < max || max < 0))
adapters.add(newMouseJointAdapter((byte) pointer));
for(MouseJointAdapter adapter : adapters)
tmp |= adapter.touchDown(screenX, screenY, pointer, button);
return tmp;
}
/** calls {@link MouseJointAdapter#touchDragged(int, int, int) touchDragged} on all {@link #adapters} */
@Override
public boolean touchDragged(int screenX, int screenY, int pointer) {
for(MouseJointAdapter adapter : adapters)
tmp |= adapter.touchDragged(screenX, screenY, pointer);
return tmp;
}
/** calls {@link MouseJointAdapter#mouseMoved(int, int) mouseMoved} on all {@link #adapters} */
@Override
public boolean mouseMoved(int screenX, int screenY) {
for(MouseJointAdapter adapter : adapters)
tmp |= adapter.mouseMoved(screenX, screenY);
return tmp;
}
/** calls {@link MouseJointAdapter#touchUp(int, int, int, int) touchUp} on all {@link #adapters} */
@Override
public boolean touchUp(int screenX, int screenY, int pointer, int button) {
for(MouseJointAdapter adapter : adapters)
tmp |= adapter.touchUp(screenX, screenY, pointer, button);
return tmp;
}
/** override this to define how new {@link MouseJointAdapter MouseJointAdapters} should be created
* @param pointer the pointer to set to the returned {@link MouseJointAdapter}
* @return a new {@link MouseJointAdapter} just like this {@link Manager Manager's} enclosing instance */
public MouseJointAdapter newMouseJointAdapter(byte pointer) {
MouseJointAdapter adapter = new MouseJointAdapter(MouseJointAdapter.this);
adapter.pointer = pointer;
return adapter;
}
/** @return the {@link #max} */
public byte getMax() {
return max;
}
/** @param max the {@link #max} to set */
public void setMax(byte max) {
if(max < 0)
throw new IllegalArgumentException("max must be greater or equal to zero");
this.max = max;
}
/** @return the {@link #adapters} */
public Array getAdapters() {
return adapters;
}
/** @param adapters the {@link #adapters} to set. If the size of the given {@link Array} is greater than {@link #max}, it will be increased */
public void setAdapters(Array adapters) {
if(adapters == null)
throw new IllegalArgumentException("adapters must not be null");
if(adapters.size > max && max > 0)
max = (byte) adapters.size;
this.adapters = adapters;
}
}
/** called on {@link MouseJointAdapter#touchDown(int, int, int, int) touchDown}, {@link MouseJointAdapter#touchDragged(int, int, int) touchDragged} and {@link MouseJointAdapter#touchUp(int, int, int, int) touchUp}
* @author dermetfan */
public static interface Listener {
/** @return true to cancel the creation of the {@link MouseJointAdapter#joint joint} */
public boolean touched(Fixture fixture, Vector2 position);
/** @return true to cancel updating the target of {@link MouseJointAdapter#joint} */
public boolean dragged(MouseJoint joint, Vector2 oldPosition, Vector2 position);
/** @return true to cancel destroying the {@link MouseJointAdapter#joint joint} */
public boolean released(MouseJoint joint, Vector2 position);
}
/** The pointer to react to. If smaller than zero, all pointers will be accepted. */
private byte pointer;
/** the {@link #listener} used by default */
public static final Listener defaultListener = new Listener() {
@Override
public boolean touched(Fixture fixture, Vector2 position) {
return false;
}
@Override
public boolean dragged(MouseJoint joint, Vector2 oldPosition, Vector2 position) {
return false;
}
@Override
public boolean released(MouseJoint joint, Vector2 position) {
return false;
}
};
/** the {@link Listener} called by {@link #queryCallback} */
private Listener listener = defaultListener;
/** the {@link Camera} used to convert to world coordinates */
private Camera camera;
/** if the {@link MouseJointDef#maxForce maxForce} of {@link #jointDef} should be multiplied with its {@link JointDef#bodyB bodyB}'s {@link Body#getMass() mass} */
private boolean adaptMaxForceToBodyMass;
/** if {@link #touchDragged(int, int, int)} should be called with {@link #pointer} on {@link #mouseMoved(int, int)} */
private boolean mouseMoved;
/** the {@link MouseJointDef} used to create {@link #joint} */
private MouseJointDef jointDef;
/** the managed {@link MouseJoint} */
private MouseJoint joint;
/** for internal, temporary usage */
private final Vector3 vec3 = new Vector3();
/** for internal, temporary usage */
private static final Vector2 vec2_0 = new Vector2(), vec2_1 = new Vector2();
/** called by {@link #touchDown(int, int, int, int)}, instantiates {@link #joint} if {@link Listener#touched(Fixture, Vector2) touched} of {@link #listener} returns true */
private final QueryCallback queryCallback = new QueryCallback() {
@Override
public boolean reportFixture(Fixture fixture) {
Body body = fixture.getBody();
if(body != jointDef.bodyA && fixture.testPoint(vec2_0) && !listener.touched(fixture, vec2_0)) {
jointDef.bodyB = body;
jointDef.target.set(vec2_0);
if(adaptMaxForceToBodyMass) {
float maxForce = jointDef.maxForce;
jointDef.maxForce *= fixture.getBody().getMass();
joint = (MouseJoint) jointDef.bodyA.getWorld().createJoint(jointDef);
jointDef.maxForce = maxForce;
return false;
}
joint = (MouseJoint) jointDef.bodyA.getWorld().createJoint(jointDef);
}
return true;
}
};
/** constructs a {@link MouseJointAdapter} with pointer set to 0 (useful for desktop)
* @see #MouseJointAdapter(MouseJointDef, boolean, Camera, byte) */
public MouseJointAdapter(MouseJointDef jointDef, boolean adaptMaxForceToBodyMass, Camera camera) {
this(jointDef, adaptMaxForceToBodyMass, camera, (byte) 0);
}
/** constructs a {@link MouseJointAdapter} using the given {@link MouseJointDef}
* @param jointDef The {@link MouseJointDef} to use. Note that its {@link JointDef#bodyB bodyB} will be changed by the {@link MouseJointAdapter} so it can be null but {@link JointDef#bodyA bodyA} has to be set!
* @param adaptMaxForceToBodyMass the {@link #adaptMaxForceToBodyMass}
* @param camera the {@link #camera}
* @param pointer the {@link #pointer} */
public MouseJointAdapter(MouseJointDef jointDef, boolean adaptMaxForceToBodyMass, Camera camera, byte pointer) {
this.jointDef = jointDef;
this.adaptMaxForceToBodyMass = adaptMaxForceToBodyMass;
this.camera = camera;
this.pointer = pointer;
}
/** constructs a new {@link MouseJointAdapter} that equals the given other one */
public MouseJointAdapter(MouseJointAdapter other) {
this(other.jointDef, other.adaptMaxForceToBodyMass, other.camera, other.pointer);
listener = other.listener;
mouseMoved = other.mouseMoved;
}
/** uses {@link #queryCallback} to create {@link #joint} if {@link #joint} is null*/
@Override
public boolean touchDown(int screenX, int screenY, int pointer, int button) {
if(joint != null || !reactsToPointer(pointer))
return false;
camera.unproject(vec3.set(screenX, screenY, 0));
vec2_0.set(vec3.x, vec3.y);
jointDef.bodyA.getWorld().QueryAABB(queryCallback, vec2_0.x, vec2_0.y, vec2_0.x, vec2_0.y);
return true;
}
/** updates the target of {@link #joint} if {@link Listener#dragged(MouseJoint, Vector2, Vector2) dragged} of {@link #listener} returns true */
@Override
public boolean touchDragged(int screenX, int screenY, int pointer) {
if(joint == null || !reactsToPointer(pointer))
return false;
camera.unproject(vec3.set(screenX, screenY, 0));
if(!listener.dragged(joint, vec2_1.set(vec2_0), vec2_0.set(vec3.x, vec3.y)))
joint.setTarget(vec2_0.set(vec3.x, vec3.y));
return true;
}
/** calls {@link #touchDragged(int, int, int)} with {@link #pointer} if {@link #mouseMoved} is true */
@Override
public boolean mouseMoved(int screenX, int screenY) {
if(mouseMoved)
return touchDragged(screenX, screenY, pointer);
return false;
}
/** destroys {@link #joint} if {@link Listener#released(MouseJoint, Vector2) released} of {@link #listener} returns true */
@Override
public boolean touchUp(int screenX, int screenY, int pointer, int button) {
if(joint == null || !reactsToPointer(pointer))
return false;
camera.unproject(vec3.set(screenX, screenY, 0));
if(!listener.released(joint, vec2_0.set(vec3.x, vec3.y))) {
jointDef.bodyA.getWorld().destroyJoint(joint);
joint = null;
return true;
}
return false;
}
/** @return if this MouseJointAdapter reacts to the specified pointer */
public boolean reactsToPointer(int pointer) {
return this.pointer == pointer || this.pointer < 0;
}
/** @return the {@link #pointer} */
public byte getPointer() {
return pointer;
}
/** @param pointer the {@link #pointer} to set */
public void setPointer(byte pointer) {
this.pointer = pointer;
}
/** @return the {@link #listener} */
public Listener getListener() {
return listener;
}
/** @param listener the {@link #listener} to set */
public void setListener(Listener listener) {
this.listener = listener != null ? listener : defaultListener;
}
/** @return the {@link #camera} */
public Camera getCamera() {
return camera;
}
/** @param camera the {@link #camera} to set */
public void setCamera(Camera camera) {
if(camera == null)
throw new IllegalArgumentException("camera must not be null");
this.camera = camera;
}
/** @return the {@link #adaptMaxForceToBodyMass} */
public boolean isAdaptMaxForceToBodyMass() {
return adaptMaxForceToBodyMass;
}
/** @param adaptMaxForceToBodyMass the {@link #adaptMaxForceToBodyMass} to set */
public void setAdaptMaxForceToBodyMass(boolean adaptMaxForceToBodyMass) {
this.adaptMaxForceToBodyMass = adaptMaxForceToBodyMass;
}
/** @return the {@link #mouseMoved} */
public boolean isMouseMoved() {
return mouseMoved;
}
/** @param mouseMoved the {@link #mouseMoved} to set */
public void setMouseMoved(boolean mouseMoved) {
this.mouseMoved = mouseMoved;
}
/** @return the {@link #jointDef} */
public MouseJointDef getJointDef() {
return jointDef;
}
/** @param jointDef the {@link #jointDef} to set */
public void setJointDef(MouseJointDef jointDef) {
if(jointDef == null)
throw new IllegalArgumentException("jointDef must not be null");
this.jointDef = jointDef;
}
/** @return the {@link #joint} */
public MouseJoint getJoint() {
return joint;
}
/** @param joint the {@link #joint} to set */
public void setJoint(MouseJoint joint) {
this.joint = joint;
}
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