/**
* Moves the paddle left by the movement offset field within the picture window's bounds avoiding
* the given ball
*
* @param pict is the Picture object with the boundary to keep the paddle within
* @param ball is a ball that causes the paddle to move back if it's in the way
*/
public void moveLeft(JFrame pict, Ball ball) {
this.x -= this.offset; // Move x left by the offset
// Test to see if the paddle moved into the ball
if (ball.distance(this.x, this.y) < ball.getRadius()
|| ball.distance(this.x, this.y + this.height / 2) < ball.getRadius()
|| ball.distance(this.x, this.y + this.height) < ball.getRadius())
this.x += this.offset; // If so, move it out of the ball
// Test to see if the boundary was in the way to the left
if (this.x < 0) this.x = 0; // If so, set left of paddle to zero
}
public boolean collidesWith(Ball ball) {
boolean hasEnteredIf = false;
if (ball.getX() - ball.getRadius() <= this.x1 || ball.getX() + ball.getRadius() >= this.x2) {
ball.reflectHorizontal();
hasEnteredIf = true;
}
if (ball.getY() - ball.getRadius() <= this.y1 || ball.getY() + ball.getRadius() >= this.y2) {
ball.reflectVertical();
hasEnteredIf = true;
}
return hasEnteredIf;
}
/**
* Moves the paddle up by the movement offset field within the picture window's bounds avoiding
* the given ball
*
* @param pict is the Picture object with the boundary to keep the paddle within
* @param ball is a ball that causes the paddle to move back if it's in the way
*/
public void moveUp(JFrame pict, Ball ball) {
this.y -= this.offset; // Move y up by the offset
// Test to see if the paddle moved into the ball
if (ball.distance(this.x, this.y) < ball.getRadius()
|| ball.distance(this.x + this.width / 2, this.y) < ball.getRadius()
|| ball.distance(this.x + this.width, this.y) < ball.getRadius())
this.y += this.offset; // If so, move it out of the ball
// Test to see if the boundary was in the way above
if (this.y < 0) this.y = 0; // If so, set top of paddle to zero
}
/**
* Moves the paddle right by the movement offset field within the picture window's bounds avoiding
* the given ball
*
* @param pict is the Picture object with the boundary to keep the paddle within
* @param ball is a ball that causes the paddle to move back if it's in the way
*/
public void moveRight(JFrame pict, Ball ball) {
this.x += this.offset; // Move x right by the offset
// Test to see if the paddle moved into the ball
if (ball.distance(this.x + this.width, this.y) < ball.getRadius()
|| ball.distance(this.x + this.width, this.y + this.height / 2) < ball.getRadius()
|| ball.distance(this.x + this.width, this.y + this.height) < ball.getRadius())
this.x -= this.offset; // If so, move it out of the ball
// Test to see if the boundary was in the way on the right
if (this.x + this.width > pict.getWidth())
this.x = pict.getWidth() - this.width; // If so, set right to right edge
}
/**
* Moves the paddle down by the movement offset field within the picture window's bounds avoiding
* the given ball
*
* @param pict is the Picture object with the boundary to keep the paddle within
* @param ball is a ball that causes the paddle to move back if it's in the way
*/
public void moveDown(JFrame pict, Ball ball) {
this.y += this.offset; // Move y down by the offset
// Test to see if the paddle moved into the ball
if (ball.distance(this.x, this.y + this.height) < ball.getRadius()
|| ball.distance(this.x + this.width / 2, this.y + this.height) < ball.getRadius()
|| ball.distance(this.x + this.width, this.y + this.height) < ball.getRadius())
this.y -= this.offset; // If so, move it out of the ball
// Test to see if the boundary was in the way below
if (this.y + this.height > pict.getHeight())
this.y = pict.getHeight() - this.height; // If so, set bottom to picture bottom
}
/** Internal routine for generating the List of particles on collision. */
public static ArrayList<Particle> generateParticles(Ball ball, Body body) {
double centerX = ball.getCenter().x();
double centerY = ball.getCenter().y();
double speed =
ball.getVelocity().magnitude() * ((body != null) ? (body.getRadius() / 100.0) : 1);
if (speed < .50) speed = .50;
if (speed > 2.50) speed = 2.50;
if (body != null) {
double max = Math.pow(body.getRadius() + ball.getRadius(), 2);
while (body.getCenter().distanceSquared(new Point2d(centerX, centerY)) < max) {
centerX -= ball.getVelocity().xComponent();
centerY -= ball.getVelocity().yComponent();
}
}
ArrayList<Particle> particles = new ArrayList<Particle>();
int num = (int) (300 * speed);
if (num < 150) num = 150;
else if (num > 400) num = 400;
for (int i = 0; i < num; i++) {
double angle = (Math.random() * 2 * Math.PI);
double xSpeed = 0.75 * (Math.random() * speed * Math.cos(angle));
double ySpeed = 0.75 * (Math.random() * speed * Math.sin(angle));
Color c;
double rand = Math.random();
if (body == null) c = CalcHelp.getShiftedColor(ball.getColor(), 100);
else if (rand < 0.3) c = CalcHelp.getShiftedColor(body.getColor(), 100);
else if (rand < 0.40) c = CalcHelp.getShiftedColor(new Color(230, 130, 70), 100);
else c = CalcHelp.getShiftedColor(ball.getColor(), 100);
Particle newParticle = new Particle(centerX, centerY, xSpeed, ySpeed, c);
particles.add(newParticle);
}
return particles;
}
/*
* Zeichenmethode zum Zeichnen der Bälle, etc.
*/
@Override
public void paint(Graphics g) {
/*
* FPS-Zäler (Ausgabe findet erst am Ende von <code>paint(Graphics g)</code>)
*/
if (frames == 1) {
time = System.currentTimeMillis();
}
if (System.currentTimeMillis() - time != 0) {
fps = (int) ((1000 * frames) / ((System.currentTimeMillis() - time)));
}
if (frames > 1000) {
frames = 0;
}
frames++;
/*
* Bild für Doublebuffering erstellen
*/
dbImage =
createImage(phys.getSize().getX().intValue() + 2, phys.getSize().getY().intValue() + 2);
dbGraphics = dbImage.getGraphics();
/*
* <code>phys.tick()</code> gehört nicht in die <code>paint(Graphics g)</code>-Methode
* in Draw-Panel, es ist jedoch nicht sehr sinvoll diesen Abschnitt auszulagern,
* da man sonst die Synchronisation der Threads (diese werden von Swing (GUI-Bibliothek)
* automatisch erstellt) selbst schreiben müsste. Dies geschieht durch den Aufruf in
* <code>paint(Graphics g)</code> automatisch.
*/
if (this.isPaused() == false) {
phys.tick();
}
/*
* Bälle zeichnen
*/
Stack<Ball> baelle = phys.getBaelle();
int anzBaelle = baelle.size();
for (int i = 0; i < anzBaelle; i++) {
dbGraphics.setColor(baelle.elementAt(i).getColor());
int x =
baelle.elementAt(i).getPosition().getX().intValue()
- baelle.elementAt(i).getRadius().intValue();
int y =
baelle.elementAt(i).getPosition().getY().intValue()
- baelle.elementAt(i).getRadius().intValue();
int d = baelle.elementAt(i).getRadius().intValue() * 2;
dbGraphics.drawOval(x, y, d, d);
/*
* Pfad des Balls zeichnen, falls aktiviert
*/
if (history == true) {
Stack<Coordinate> hist = baelle.elementAt(i).getHistory();
int oldX = baelle.elementAt(i).getPosition().getX().intValue();
int oldY = baelle.elementAt(i).getPosition().getY().intValue();
for (int h = hist.size() - 1; h != 0; h--) {
Color c =
new Color(
baelle.elementAt(i).getColor().getRed(),
baelle.elementAt(i).getColor().getGreen(),
baelle.elementAt(i).getColor().getBlue(),
(255 * h / hist.size()));
dbGraphics.setColor(c);
dbGraphics.drawLine(
oldX, oldY, hist.get(h).getX().intValue(), hist.get(h).getY().intValue());
oldX = hist.get(h).getX().intValue();
oldY = hist.get(h).getY().intValue();
}
}
/*
* Richtungspfeil zeichnen, falls aktiviert
*/
if (directionArrow == true) {
dbGraphics.setColor(baelle.elementAt(i).getColor());
drawArrow(
(Graphics2D) dbGraphics,
baelle.elementAt(i).getPosition().getX().intValue(),
baelle.elementAt(i).getPosition().getY().intValue(),
baelle.elementAt(i).getPosition().getX() + (baelle.elementAt(i).getSpeed().getX() * 50),
baelle.elementAt(i).getPosition().getY()
+ (baelle.elementAt(i).getSpeed().getY() * 50));
}
}
/*
* Erfassen der Mausposition und Zeichnen der Vorlage für den nächsten
* zu erzeugenden Ball
*/
int x = newBall.getPosition().getX().intValue() - newBall.getRadius().intValue();
int y = newBall.getPosition().getY().intValue() - newBall.getRadius().intValue();
int d = newBall.getRadius().intValue() * 2;
if (mousePressed == false) {
dbGraphics.setColor(Color.red);
} else {
dbGraphics.setColor(Color.green);
}
dbGraphics.drawOval(x, y, d, d);
if (mousePressed == true) {
dbGraphics.drawLine(
newBall.getPosition().getX().intValue(),
newBall.getPosition().getY().intValue(),
secondMouseCoordinate.getX().intValue(),
secondMouseCoordinate.getY().intValue());
}
dbGraphics.setColor(Color.black);
dbGraphics.drawRect(0, 0, phys.getSize().getX().intValue(), phys.getSize().getY().intValue());
Point mousePos = getMousePosition();
if (mousePos != null && mousePressed == false) {
newBall.setPosition(new Coordinate(new Double(mousePos.x), new Double(mousePos.y)));
}
if (mousePos != null && mousePressed == true) {
secondMouseCoordinate = new Coordinate(new Double(mousePos.x), new Double(mousePos.y));
}
/*
* Ausgeben der FPS-Zahl
*/
dbGraphics.drawString("FPS: " + String.valueOf(fps), 10, 20);
g.drawImage(dbImage, 0, 0, this);
}
/**
* Determines if the given ball has collided with the paddle and returns true if it has and false
* if it has not. If the ball has collided with the paddle the balls movement vectors are modified
* so the ball will bounce back at the proper angle.
*
* @param ball is the ball to examine to see if it has collided with the paddle
* @return Returns true if ball collides with paddle and if so updates vectors
*/
public boolean collision(Ball ball) {
// Temp variables for paddle corner coordinates;
int pX1 = this.x;
int pX2 = pX1 + this.width - 1;
int pY1 = this.y;
int pY2 = pY1 + this.height - 1;
// Temp variables for ball coordinates, movement vectors, and radius
int bX = ball.getX();
int bY = ball.getY();
int vX = ball.getXVector();
int vY = ball.getYVector();
int bRad = ball.getRadius();
// Testing for collisions with the paddle edges and the Ball
if (bX < pX1 && bY >= pY1 && bY <= pY2 && vX > 0) // left edge
{
if (bX + bRad > pX1) // will collide with edge
{
ball.setX(pX1 - bRad);
ball.setXVector(-Math.abs(vX)); // Change x direction
return true;
}
} else if (bX > pX2 && bY >= pY1 && bY <= pY2 && vX < 0) // right edge
{
if (bX - bRad < pX2) // will collide with edge
{
ball.setX(pX2 + bRad);
ball.setXVector(Math.abs(vX)); // Change x direction
return true;
}
} else if (bY < pY1 && bX >= pX1 && bX <= pX2 && vY > 0) // top edge
{
if (bY + bRad > pY1) // will collide with edge
{
ball.setY(pY1 - bRad);
ball.setYVector(-Math.abs(vY)); // Change y direction
return true;
}
} else if (bY > pY2 && bX >= pX1 && bX <= pX2 && vY < 0) // bottom edge
{
if (bY - bRad < pY2) // will collide with edge
{
ball.setY(pY2 + bRad);
ball.setYVector(Math.abs(vY)); // Change y direction
return true;
}
} else // Otherwise test to see if the ball hits a corner of the paddle
{
if (ball.distance(pX1, pY1) <= bRad
&& ball.distance(pX1, pY1) <= ball.distance(pX2, pY1)) { // top-left corner collision
if (Math.abs(pX1 - bX) >= Math.abs(pY1 - bY)) if (vX > 0) ball.setXVector(-vX);
if (Math.abs(pX1 - bX) <= Math.abs(pY1 - bY)) if (vY > 0) ball.setYVector(-vY);
return true;
} else if (ball.distance(pX2, pY1) <= bRad) { // top-right corner collision
if (Math.abs(pX2 - bX) >= Math.abs(pY1 - bY)) if (vX < 0) ball.setXVector(-vX);
if (Math.abs(pX2 - bX) <= Math.abs(pY1 - bY)) if (vY > 0) ball.setYVector(-vY);
return true;
} else if (ball.distance(pX2, pY2) <= bRad
&& ball.distance(pX2, pY2) <= ball.distance(pX1, pY2)) { // bottom-right corner collision
if (Math.abs(pX2 - bX) >= Math.abs(pY2 - bY)) if (vX < 0) ball.setXVector(-vX);
if (Math.abs(pX2 - bX) <= Math.abs(pY2 - bY)) if (vY < 0) ball.setYVector(-vY);
return true;
} else if (ball.distance(pX1, pY2) <= bRad) { // bottom-left corner collision
if (Math.abs(pX1 - bX) >= Math.abs(pY2 - bY)) if (vX > 0) ball.setXVector(-vX);
if (Math.abs(pX1 - bX) <= Math.abs(pY2 - bY)) if (vY < 0) ball.setYVector(-vY);
return true;
}
}
return false;
}
