protected override void update()
{
Paddle paddle = paddleSet.get(0);
Ball ball = ballSet.get(0);
/* EXAMPLE 1
* Single IF Statement
*
* Notice how this if statement seeks to
* determine if the game logic should continue
* or if we should jump to the game winning code
* in gameWin()
*/
bool playerWonGame = areAllBlocksRemoved();
if (playerWonGame) // The player has won when all the normal blocks are removed
{
gameWin();
}
/* EXAMPLE 2
* Sequential, Single IF Statement Demonstration
*
* The above if statement is followed by a
* second if statement in sequential order.
* Since we omitted the "else" statement here
* these two ifs are unrelated to one another
* and their code blocks are not mutually exclusive
* We'll improve this code once we reach if/else
* statements in the lab
*/
if (!playerWonGame)
{
/* TODO 5
* Compound Boolean Expressions using Logical AND and Logical OR
*
* Here, we'll combine the mouse and keyboard if statements into one
* longer, compound if statement using AND and OR.
*
* The if statement below should ask: "Is the spacebar pressed
* OR is BOTH the mouse onscreen AND the left button clicked?"
* Note that the OR is "||", the AND is "&&" and the BOTH is accomplished
* by adding parenthesis around MouseOnScreen() and isButtonTapped()
*
* If either of these (or both) are true, then this will execute the
* code you already wrote in the TODO1 section below.
* How is this question change if we swapped all ANDs and ORs?
* This would produce the question: "Is the spacebar pressed
* AND EITHER the mouse onscreen OR the the left button is clicked?"
*
* before: Only pressing the space key would cause the ball to spawn.
* after: Now, using the mouse or the space key causes balls to spawn.
*
*/
/* Starting code:
* if (keyboard.isButtonTapped(KeyEvent.VK_SPACE)) {
*/
if (keyboard.isKeyTapped(Keys.Space) || (MouseDevice.MouseOnScreen() && MouseDevice.IsRightTapped())) /** SOLN */
/* TODO 1
* Single IF Statement
*
* Write a single If statement here that asks:
*
* "Is the ball invisible?". If it is invisible, then
* put it on the screen near the paddle by calling "ball.spawn(paddle)".
*
* See the EXAMPLE1 and EXAMPLE1B for a sample single IF statement.
*
* Transform this pseuducode into the if statement below:
* Step 1: if the ball is invisible, then tell the ball to spawn near the paddle.
* Step 2: fill in the code gaps below to obtain working Java code
*
* if( <your question goes here> ) {
* <your "then" code goes here to spawn the paddle near the ball>
* }
*
* before: hitting space or left-clicking does nothing in our game
* after: hitting space or left-clicking spawns a ball and starts the game
*
*/
{
if (ball.Visible == false) /** SOLN */
{
ball.spawn(paddle);
}
}
/* TODO 4
* Use Logical AND to Enable Mouse Support for Ball Spawning
*
* Rewrite the three IF statements below as one compound IF statement using Java's logical
* AND operator "&&". Start by commenting out the 3 if statements, and build your own in
* its place.
*
* Notice the IF statements and what they accomplish; in order, they ask the following:
* (1) Is the mouse is onscreen? (i.e. connected to your computer)
* (2) Is the mouse's left-button is pressed?
* (3) Is the ball already spawned? (i.e. is the ball already visible?)
*
* before: Three if statements, with one nested inside the other.
* after: One compound if statement to rule the spawning of the ball.
*/
if (MouseDevice.MouseOnScreen()) //is a mouse connected to the computer?
{
if (MouseDevice.IsRightTapped())
{ //is the mouse's left-button pressed?
if (ball.Visible == false) //is there no ball on the scree currently
{
ball.spawn(paddle);
}
}
}
if (MouseDevice.MouseOnScreen() && MouseDevice.IsRightTapped() && ball.Visible == true) /** SOLN */
{
ball.spawn(paddle);
}
/* TODO 2
* Sequential, Single If statements.
*
* These will have the form as outlined in the lab, and will ask:
*
* "Is the user pressing the left key? If so, move the paddle left."
* "Is the user pressing the right key? If so, move the paddle right."
* "Is the user pressing the up key? If so, move the paddle up."
* "Is the user pressing the down key? If so, move the paddle down."
*
* Transform this pseuducode above into the if statement below:
* by replacing "LEFT button" with "KeyEvent.VK_LEFT" and
* by replacing "keyboard is pressing down" with "keyboard.isButtonDown()"
* by replacing "Tell the paddle to move left" with "paddle.moveLeft()"
*
* if (keyboard is pressing down the LEFT button) {
* Tell the paddle to move left
* }
*
* if (keyboard is pressing down the RIGHT button) {
* Tell the paddle to move right
* }
*
* if (the keyboard is pressing UP) {
* Tell the paddle to move up
* }
*
* if pressing down {
* move paddle down.
* }
*
* before:
* after:
*
* Take a look at the animated gif in the lab for a pictorial example of the before and after.
*
*/
//BUG: NOTE: the mouse check must come first here, or the if's need to be joined as an if-else clause for the keyboard code to function correctly
if (keyboard.isKeyDown(Keys.Left)) /** SOLN */
{
paddle.moveLeft();
//mouse.setX() //solution to bug 1001
}
else if (keyboard.isKeyDown(Keys.Right)) /** SOLN */
{
paddle.moveRight();
//mouse.setY() //solution to bug 1001
}
if (MouseDevice.MouseOnScreen()) /** SOLN */
{
paddle.CenterX = MouseDevice.getMouseX();
paddle.clampAtWorldBounds();
}
/* EXAMPLE 4
* Compound Boolean Expressions using Logical AND
*
* Notice how we check the ball first for null before we try to use it.
* By ordering the null check first and using the double '&', we perform a short-circuit
* evaulation of the clauses in the if statement. This means that the && will
* block execution of the second Boolean expression if the first expression is false.
*
* This is based on the following observations:
* FALSE AND X is always FALSE, regardless of X.
* TRUE OR Y is always TRUE, regardless of Y.
*
* Also observe how reversing the expressions
* is a logic error and could result in NullPointerExceptions being thrown.
* So we can see order of boolean expressions is important inside an
* if statement, just like the order of the statements in an if/else chain matters as well.
*/
if (ball != null && ball.Visible)
{
BoundCollidedStatus status = ball.collideWorldBound();
switch (status)
{
case BoundCollidedStatus.CollidedTop: {
ball.reflectTop();
ball.playBounceSound();
break;
}
case BoundCollidedStatus.CollideBottom: {
ball.Visible = false;
ball.playDieSound();
lifeSet.remove();
if (lifeSet.getCount() < 1)
{
gameLost();
}
break;
}
case BoundCollidedStatus.CollidedLeft: {
ball.reflectLeft();
ball.playBounceSound();
break;
}
case BoundCollidedStatus.CollidedRight: {
ball.reflectRight();
ball.playBounceSound();
break;
}
// Catch the case where the ball is inside the
// world and not hitting any bounds. A warning is
// given if all cases are not handled.
default:
break;
}
/* TODO Z
* another good single if (without it, the ball goes through the paddle!)
*
* before: The ball goes right through the paddle!
* after: The ball reflects off the paddle and plays a bounce sound
*
* Take a look at the animated gif in the lab for a pictorial example of the before and after.
*/
if (paddle.Collided(ball))
{
paddle.reflect(ball);
ball.playBounceSound();
}
//ROB/KELVIN; consider undoing the import so the students know PaddleStates live inside Paddles?
//ROB/KELVIN Q2: unite Ball and Paddle Types/States respectively, to reduce logic to:
// if(ball.getState() != paddle.getState() ) ball.setState(paddle.getState());
/* EXAMPLE 1B
* Single IF Statement
*
* The following if statement checks to see if the paddle and ball state/types
* are synchronized. If the paddle is in a NORMAL state, the ball should be
* set to a NORMAL type/state as well, which draws a standard ball (with no
* fire or ice) on the screen.
*
*/
if (paddle.getState() == Paddle.PaddleState.NORMAL)
{
ball.setType(Ball.BallType.NORMAL);
}
/* TODO Y
* IF-ELSE Chain
*
* Write a chain of 2 IF statements joined by an ELSE clause to determine if
* the ball needs to be transformed into a fireball or iceball, respectively, based
* on the current state of the paddle.
*
* See the example above for how this is done for the NORMAL state and NORMAL ball type
*
* before: Balls don't change to fire or ice as they should when they collide with such blocks
* after: Balls will visibly change appearance to match the paddle's fire or ice state.
*
* Take a look at the animated gif in the lab for a pictorial example of the before and after.
*/
if (paddle.getState() == Paddle.PaddleState.FIRE)
{
ball.setType(Ball.BallType.FIRE); /** SOLN */
}
else if (paddle.getState() == Paddle.PaddleState.ICE)
{
ball.setType(Ball.BallType.ICE); /** SOLN */
}
//logic reduction here to see ball and paddle states are synchronized
/** ball.setState(paddle.getState()); REDUCE to this! */
//ROB/KELVIN: where does a paddle get its state set?
//ROB/KELVIN: where does a ball get its state set? In response to the paddle, and in the update, right?
if (blockSet.isBallCollidingWithABlock(ball))
{
handleBlockBallCollision(ball, paddle);
}
}
}
}
protected override void update()
{
Paddle paddle = paddleSet.get(0);
Ball ball = ballSet.get(0);
bool playerWonGame = areAllBlocksRemoved();
if (playerWonGame)
{ //EXAMPLE 1 asks if playerWonGame == true
gameWin(); //and then calls the gameWin() function
}
if (!playerWonGame)
{
if (keyboard.isKeyTapped(Keys.Space) || (MouseDevice.MouseOnScreen() && MouseDevice.IsLeftTapped()))
{
if (ball.Visible)
{
ball.spawn(paddle);
}
}
//Editors note: we revert sections of future labs to their starting point where it
//doesn't affect the future labs to block newer labs providing all of the answers
//to previous labs, and the below unduly nested if statement is one such example
if (MouseDevice.MouseOnScreen())
{ //is a MouseDevice connected to the computer?
if (MouseDevice.IsLeftTapped())
{ //is the MouseDevice's left-button pressed?
if (ball.Visible == false)
{ //is there no ball on the screen currently
ball.spawn(paddle);
}
}
}
if (keyboard.isKeyDown(Keys.Left))
{ //SOLN
paddle.moveLeft();
//MouseDevice.setX() //solution to bug 1001
}
if (keyboard.isKeyDown(Keys.Right))
{ //SOLN
paddle.moveRight();
//MouseDevice.setX() //solution to bug 1001
// MouseDevice.setWorld(new World());
}
if (MouseDevice.MouseOnScreen())
{ //SOLN
paddle.CenterX = MouseDevice.getMouseX();
paddle.clampAtWorldBounds();
}
if (ball != null && ball.Visible)
{
BoundCollidedStatus status = ball.collideWorldBound();
switch (status)
{
case BoundCollidedStatus.CollidedTop:
{
ball.reflectTop();
ball.playBounceSound();
break;
}
case BoundCollidedStatus.CollideBottom:
{
ball.Visible = false;
ball.playDieSound();
lifeSet.remove();
if (lifeSet.getCount() < 1)
{
gameLost();
}
break;
}
case BoundCollidedStatus.CollidedLeft:
{
ball.reflectLeft();
ball.playBounceSound();
break;
}
case BoundCollidedStatus.CollidedRight:
{
ball.reflectRight();
ball.playBounceSound();
break;
}
// Catch the case where the ball is inside the
// world and not hitting any bounds. A warning is
// given if all cases are not handled.
default:
break;
}
if (paddle.Collided(ball))
{
paddle.reflect(ball); //method pushes this ball out a bit
//BUG: paddle.reflect(ball) and ball.reflect(paddle) do different things
//issue: using paddle.reflect(ball) pushes out in the y where ball.reflect paddle doesnt.
//solutionToBug: have both methods do the algorithm below (pushout and then call superclass?)
//instead of only one.
//solution: have the pushout amount be relative to the inverse of the current
//direction of motion, so if the ball was coming down from the top you move it -5
//in the y (or up) and if the ball is coming from the right to the left, you move
//it +5 in the x (where 5 is the speed)
ball.playBounceSound();
}
//ROB/KELVIN; consider undoing the import so the students know PaddleStates live inside Paddles?
//ROB/KELVIN Q2: unite Ball and Paddle Types/States respectively, to reduce logic to:
// if(ball.getState() != paddle.getState() ) ball.setState(paddle.getState());
if (paddle.getState() == Paddle.PaddleState.NORMAL)
{
ball.setType(Ball.BallType.NORMAL);
}
if (paddle.getState() == Paddle.PaddleState.FIRE)
{
ball.setType(Ball.BallType.FIRE); //soln
}
else if (paddle.getState() == Paddle.PaddleState.ICE)
{
ball.setType(Ball.BallType.ICE); //soln
}
//logic reduction here to see ball and paddle states are synchronized
/** ball.setState(paddle.getState()); REDUCE to this! */
if (blockSet.isBallCollidingWithABlock(ball))
{
handleBlockBallCollision(ball, paddle);
}
}
}
}
protected override void update()
{
Paddle paddle = paddleSet.get(0);
Ball ball = ballSet.get(0);
if (blockSet.allBlocksAreDead())
{
gameWin();
}
else
{
// Spawn ball
if (keyboard.isKeyTapped(Keys.Space) ||
(MouseDevice.MouseOnScreen() && MouseDevice.IsLeftTapped()))
{
if (ball.Visible == false)
{
ball.spawn(paddle);
}
}
if (keyboard.isKeyDown(Keys.Left))
{
paddle.moveLeft();
}
if (keyboard.isKeyDown(Keys.Right))
{
paddle.moveRight();
}
if (MouseDevice.MouseOnScreen())
{
paddle.CenterX = MouseDevice.getMouseX();
paddle.clampAtWorldBounds();
}
if (ball != null && ball.Visible)
{
ballWorldCollision(ball);
// Paddle and ball collision
if (paddle.Collided(ball))
{
paddle.reflect(ball);
ball.playBounceSound();
}
// Checks to see ball and paddle states are synchronized.
if (ball.isBurning())
{
if (paddle.getState() == Paddle.PaddleState.NORMAL)
{
ball.setType(Ball.BallType.NORMAL);
}
else if (paddle.getState() == Paddle.PaddleState.ICE)
{
ball.setType(Ball.BallType.ICE);
}
}
if (ball.isFrozen())
{
if (paddle.getState() == Paddle.PaddleState.NORMAL)
{
ball.setType(Ball.BallType.NORMAL);
}
else if (paddle.getState() == Paddle.PaddleState.FIRE)
{
ball.setType(Ball.BallType.FIRE);
}
}
if (blockSet.isBallCollidingWithABlock(ball))
{
// Demonstrate 'while' loops:
// Walk outwards, removing blocks as we go,
// until we reach a wall or missing block
Block block = blockSet.getCollidedBlock(ball);
block.reflect(ball);
//if (block.getType() == Block.BlockType.NORMAL) {
int row = block.getRow();
int col = block.getColumn();
//blockSet.remove(block);
block.revealPower();
int nextCol = col;
while (nextCol + 1 < blockSet.getNumColumns() && block != null && block.getType() == Block.BlockType.NORMAL)
{
if (block.getType() == Block.BlockType.NORMAL)
{
blockSet.remove(block);
}
//block.revealPower();
nextCol++;
block = blockSet.getBlockAt(row, nextCol);
}
nextCol = col - 1;
while (nextCol >= 0 &&
block != null &&
block.getType() == Block.BlockType.NORMAL)
{
if (block.getType() == Block.BlockType.NORMAL)
{
// blockSet.remove(block);
block.revealPower();
}
nextCol--;
block = blockSet.getBlockAt(row, nextCol);
}
// }
}
}
}
}