@Override
public boolean onTrackballEvent(MotionEvent event) {
if (!gameRunning()) return false;
if (mBlue.player == false) {
mBlue.player = true;
mBlue.destination = mBlue.centerX();
}
switch (event.getAction()) {
case MotionEvent.ACTION_MOVE:
mBlue.destination =
(int)
Math.max(
0, Math.min(getWidth(), mBlue.destination + SCROLL_SENSITIVITY * event.getX()));
break;
}
return true;
}
/** Resets the lives and the position of the paddles. */
private void resetPaddles() {
int mid = getWidth() / 2;
mRed.setPosition(mid);
mBlue.setPosition(mid);
mGreen.setPosition(mid);
mYellow.setPosition(mid);
mCyan.setPosition(mid);
mOrange.setPosition(mid);
mRed.destination = mid;
mBlue.destination = mid;
mGreen.destination = mid;
mYellow.destination = mid;
mCyan.destination = mid;
mOrange.destination = mid;
mRed.setLives(STARTING_LIVES);
mBlue.setLives(STARTING_LIVES);
}
/**
* Touching is the method of movement. Touching the touchscreen, that is. A player can join in
* simply by touching where they would in a normal game.
*/
public boolean onTouch(View v, MotionEvent mo) {
if (v != this || !gameRunning()) return false;
// We want to support multiple touch and single touch
InputHandler handle = InputHandler.getInstance();
// Loop through all the pointers that we detected and
// process them as normal touch events.
for (int i = 0; i < handle.getTouchCount(mo); i++) {
int tx = (int) handle.getX(mo, i);
int ty = (int) handle.getY(mo, i);
// Bottom paddle moves when we are playing in one or two player mode and the touch
// was in the lower quartile of the screen.
if (mBlue.player && mBlue.inTouchbox(tx, ty)) {
mBlue.destination = tx;
mGreen.destination = tx;
mCyan.destination = tx;
} else if (mRed.player && mRed.inTouchbox(tx, ty)) {
mRed.destination = tx;
mYellow.destination = tx;
mOrange.destination = tx;
} else if (mo.getAction() == MotionEvent.ACTION_DOWN && mPauseTouchBox.contains(tx, ty)) {
if (mCurrentState != State.Stopped) {
mLastState = mCurrentState;
mCurrentState = State.Stopped;
} else {
mCurrentState = mLastState;
mLastState = State.Stopped;
}
}
// In case a player wants to join in...
if (mo.getAction() == MotionEvent.ACTION_DOWN) {
if (!mBlue.player && mBlue.inTouchbox(tx, ty)) {
mBlue.player = true;
} else if (!mRed.player && mRed.inTouchbox(tx, ty)) {
mRed.player = true;
}
}
}
return true;
}
private void aiFollow(Paddle cpu) {
cpu.destination = (int) mBall.x;
cpu.move(true);
}
private void aiExact(Paddle cpu) {
cpu.destination = (int) mBall.x;
cpu.setPosition(cpu.destination);
}
/**
* A generalized Pong AI player. Takes a Rect object and a Ball, computes where the ball will be
* when ball.y == rect.y, and tries to move toward that x-coordinate. If the ball is moving
* straight it will try to clip the ball with the edge of the paddle.
*
* @param cpu
*/
private void aiPrediction(Paddle cpu, Paddle opponent) {
Ball ball = new Ball(mBall);
// Special case: move torward the center if the ball is blinking
if (mBall.serving()) {
cpu.destination = getWidth() / 2;
cpu.move(true);
return;
}
// Something is wrong if vy = 0.. let's wait until things fix themselves
if (ball.vy == 0) return;
// Y-Distance from ball to Rect 'cpu'
float cpuDist = Math.abs(ball.y - cpu.centerY());
// Y-Distance to opponent.
float oppDist = Math.abs(ball.y - opponent.centerY());
// Distance between two paddles.
float paddleDistance = Math.abs(cpu.centerY() - opponent.centerY());
// Is the ball coming at us?
boolean coming =
(cpu.centerY() < ball.y && ball.vy < 0) || (cpu.centerY() > ball.y && ball.vy > 0);
// Total amount of x-distance the ball covers
float total =
((((coming) ? cpuDist : oppDist + paddleDistance)) / Math.abs(ball.vy)) * Math.abs(ball.vx);
// Playable width of the stage
float playWidth = getWidth() - 2 * Ball.RADIUS;
float wallDist = (ball.goingLeft()) ? ball.x - Ball.RADIUS : playWidth - ball.x + Ball.RADIUS;
// Effective x-translation left over after first bounce
float remains = (total - wallDist) % playWidth;
// Bounces the ball will incur
int bounces = (int) ((total) / playWidth);
boolean left = (bounces % 2 == 0) ? !ball.goingLeft() : ball.goingLeft();
cpu.destination = getWidth() / 2;
// Now we need to compute the final x. That's all that matters.
if (bounces == 0) {
cpu.destination = (int) (ball.x + total * Math.signum(ball.vx));
} else if (left) {
cpu.destination = (int) (Ball.RADIUS + remains);
} else { // The ball is going right...
cpu.destination = (int) ((Ball.RADIUS + playWidth) - remains);
}
// Try to give it a little kick if vx = 0
int salt = (int) (System.currentTimeMillis() / 10000);
Random r = new Random((long) (cpu.centerY() + ball.vx + ball.vy + salt));
int width = cpu.getWidth();
cpu.destination =
(int)
bound(
cpu.destination + r.nextInt(2 * width - (width / 5)) - width + (width / 10),
0,
getWidth());
cpu.move(true);
}