Back to project page webots-remote-control.
The source code is released under:
GNU Lesser General Public License
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package org.black_mesa.webots_remote_control.utils; /*from w w w . j a v a 2s.c o m*/ import java.util.Timer; import java.util.TimerTask; import org.black_mesa.webots_remote_control.listeners.CameraTouchListenerV1; import android.os.SystemClock; import android.view.MotionEvent; /** * Handles the touch events on a CameraView. Interaction mode: oval, pinch sets forward position. * * @author Ilja Kroonen */ public class CameraTouchHandlerV1 { private static final int TIMER_TICK = 32; /* * Current state of the handler. */ private State mState = State.INIT; /* * Main pointer id and last coordinates. Valid in states DOUBLE_CENTRAL, SINGLE_CENTRAL, SINGLE_SIDE. */ private int mP1; private float mX1; private float mY1; /* * Second pointer id and last coordinates. Valid in state DOUBLE_CENTRAL. */ private int mP2; private float mX2; private float mY2; /* * Timer for SINGLE_SIDE. */ private Timer mTimer; /* * Timestamp of the last event that has been consumed (uptime millis). Valid in state SINGLE_SIDE. */ private long mTimestamp; /* * Information about the touching surface. */ private float mXMin; private float mYMin; private float mXMax; private float mYMax; /* * Listener for the generated events */ private CameraTouchListenerV1 mListener; /** * Instantiates the CameraTouchHandler. * * @param xMin * Start of the x axis of the window. * @param yMin * Start of the y axis of the window. * @param xMax * End of the x axis of the window. * @param yMax * End of the y axis of the window. * @param l * Listener that will be notified of the actions that need to be performed on the camera. */ public CameraTouchHandlerV1(final float xMin, final float yMin, final float xMax, final float yMax, final CameraTouchListenerV1 l) { mXMin = xMin; mYMin = yMin; mXMax = xMax; mYMax = yMax; mListener = l; } /** * Has to be called at each touch event on the view. * * @param event * MotionEvent that was generated by Android. */ public final void onTouch(final MotionEvent event) { switch (event.getActionMasked()) { case MotionEvent.ACTION_DOWN: downHandler(event); break; case MotionEvent.ACTION_CANCEL: cancelHandler(event); break; case MotionEvent.ACTION_UP: upHandler(event); break; case MotionEvent.ACTION_POINTER_DOWN: pointerDownHandler(event); break; case MotionEvent.ACTION_POINTER_UP: pointerUpHandler(event); break; case MotionEvent.ACTION_MOVE: moveHandler(event); break; } update(event); } private void moveHandler(final MotionEvent event) { switch (mState) { case DOUBLE_CENTRAL: float prevDistance = distance(mX1, mY1, mX2, mY2); float newDistance = distance(event.getX(event.findPointerIndex(mP1)), event.getY(event.findPointerIndex(mP1)), event.getX(event.findPointerIndex(mP2)), event.getY(event.findPointerIndex(mP2))); float res = (newDistance - prevDistance) / distance(mXMin, mYMin, mXMax, mYMax); mListener.moveForward(res); break; case INIT: throw new RuntimeException(); case SINGLE_CENTRAL: float dX = (event.getX() - mX1) / (mXMax - mXMin); float dY = (event.getY() - mY1) / (mYMax - mYMin); mListener.turnPitch(dX, dY); break; case SINGLE_SIDE: break; case DOUBLE_SIDE: prevDistance = distance(mX1, mY1, mX2, mY2); newDistance = distance(event.getX(event.findPointerIndex(mP1)), event.getY(event.findPointerIndex(mP1)), event.getX(event.findPointerIndex(mP2)), event.getY(event.findPointerIndex(mP2))); res = (newDistance - prevDistance) / distance(mXMin, mYMin, mXMax, mYMax); mListener.moveForward(res); break; } } private void pointerUpHandler(final MotionEvent event) { switch (mState) { case DOUBLE_CENTRAL: int id = event.getPointerId(event.getActionIndex()); int count = event.getPointerCount(); if (count == 2) { if (id == mP1) { mP1 = mP2; } mState = State.SINGLE_CENTRAL; } else if (count > 2) { if (id == mP1) { for (int i = 0; i < count; i++) { int candidate = event.getPointerId(i); if (candidate != id && candidate != mP2) { mP1 = candidate; break; } } } else if (id == mP2) { for (int i = 0; i < count; i++) { int candidate = event.getPointerId(i); if (candidate != id && candidate != mP1) { mP2 = candidate; break; } } } mState = State.DOUBLE_CENTRAL; } else { throw new RuntimeException(); } break; case INIT: throw new RuntimeException(); case SINGLE_CENTRAL: throw new RuntimeException(); case SINGLE_SIDE: throw new RuntimeException(); case DOUBLE_SIDE: id = event.getPointerId(event.getActionIndex()); count = event.getPointerCount(); if (count == 2) { if (id == mP1) { mP1 = mP2; } mTimer = new Timer(); TimerTask task = new TimerTask() { @Override public void run() { timerHandler(); } }; mTimer.schedule(task, 0, TIMER_TICK); mState = State.SINGLE_SIDE; } else if (count > 2) { if (id == mP1) { for (int i = 0; i < count; i++) { int candidate = event.getPointerId(i); if (candidate != id && candidate != mP2) { mP1 = candidate; break; } } } else if (id == mP2) { for (int i = 0; i < count; i++) { int candidate = event.getPointerId(i); if (candidate != id && candidate != mP1) { mP2 = candidate; break; } } } mState = State.DOUBLE_SIDE; } else { throw new RuntimeException(); } break; } } private void pointerDownHandler(final MotionEvent event) { switch (mState) { case DOUBLE_CENTRAL: mState = State.DOUBLE_CENTRAL; break; case INIT: throw new RuntimeException(); case SINGLE_CENTRAL: mP2 = event.getPointerId(event.getActionIndex()); mState = State.DOUBLE_CENTRAL; break; case SINGLE_SIDE: mTimer.cancel(); mP2 = event.getPointerId(event.getActionIndex()); mState = State.DOUBLE_SIDE; break; case DOUBLE_SIDE: mState = State.DOUBLE_SIDE; break; } } private void upHandler(final MotionEvent event) { switch (mState) { case DOUBLE_CENTRAL: throw new RuntimeException(); case INIT: throw new RuntimeException(); case SINGLE_CENTRAL: mState = State.INIT; break; case SINGLE_SIDE: mTimer.cancel(); mState = State.INIT; break; case DOUBLE_SIDE: throw new RuntimeException(); } } private void cancelHandler(final MotionEvent event) { switch (mState) { case DOUBLE_CENTRAL: mState = State.INIT; break; case INIT: throw new RuntimeException(); case SINGLE_CENTRAL: mState = State.INIT; break; case SINGLE_SIDE: mTimer.cancel(); mState = State.INIT; break; case DOUBLE_SIDE: mState = State.INIT; break; } } private void downHandler(final MotionEvent event) { switch (mState) { case DOUBLE_CENTRAL: throw new RuntimeException(); case INIT: mP1 = event.getPointerId(event.getActionIndex()); if (isCenter(event.getX(), event.getY())) { mState = State.SINGLE_CENTRAL; } else { mTimer = new Timer(); TimerTask task = new TimerTask() { @Override public void run() { timerHandler(); } }; mTimer.schedule(task, 0, TIMER_TICK); mState = State.SINGLE_SIDE; } break; case SINGLE_CENTRAL: throw new RuntimeException(); case SINGLE_SIDE: throw new RuntimeException(); case DOUBLE_SIDE: throw new RuntimeException(); } } private void timerHandler() { switch (mState) { case DOUBLE_CENTRAL: throw new RuntimeException(); case INIT: throw new RuntimeException(); case SINGLE_CENTRAL: throw new RuntimeException(); case SINGLE_SIDE: float resX = (mX1 - (mXMax - mXMin) / 2) / (mXMax - mXMin); float resY = (mY1 - (mYMax - mYMin) / 2) / (mYMax - mYMin); long now = SystemClock.uptimeMillis(); long time = now - mTimestamp; mListener.moveSide(resX, resY, time); mTimestamp = now; break; case DOUBLE_SIDE: throw new RuntimeException(); } } private void update(final MotionEvent event) { switch (mState) { case DOUBLE_CENTRAL: mX1 = event.getX(event.findPointerIndex(mP1)); mY1 = event.getY(event.findPointerIndex(mP1)); mX2 = event.getX(event.findPointerIndex(mP2)); mY2 = event.getY(event.findPointerIndex(mP2)); break; case INIT: break; case SINGLE_CENTRAL: mX1 = event.getX(event.findPointerIndex(mP1)); mY1 = event.getY(event.findPointerIndex(mP1)); break; case SINGLE_SIDE: mX1 = event.getX(event.findPointerIndex(mP1)); mY1 = event.getY(event.findPointerIndex(mP1)); mTimestamp = event.getEventTime(); break; case DOUBLE_SIDE: mX1 = event.getX(event.findPointerIndex(mP1)); mY1 = event.getY(event.findPointerIndex(mP1)); mX2 = event.getX(event.findPointerIndex(mP2)); mY2 = event.getY(event.findPointerIndex(mP2)); break; } } private boolean isCenter(final float x, final float y) { // We have to detect if the zone that has been touched is the "center". // Here, we defined the center as an oval covering 2/3 of the view. float u = (mXMax - mXMin) / 2; float v = (mYMax - mYMin) / 2; float a = (mXMax - mXMin) / 3; float b = (mYMax - mYMin) / 3; float t = (x - u) * (x - u) / (a * a) + (y - v) * (y - v) / (b * b); return t <= 1; } private float distance(final float x1, final float y1, final float x2, final float y2) { return (float) Math.sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2)); } private enum State { DOUBLE_CENTRAL, DOUBLE_SIDE, INIT, SINGLE_CENTRAL, SINGLE_SIDE } }