JDK 1.4.2_04 and AffineTransform
I use JDev 9.0.3.3 (build 1205)
It started with JDK 1.3.1_02 and I upgraded it to 1.4.2_02.
My simple Swing/JClient program runs fine using JDK1.3 but always crashes when I use 1.4 with the following exception:
java.lang.StackOverflowError
at java.awt.geom.AffineTransform.translate(AffineTransform.java:1076)
Any clues?
Arie,
Jdeveloper 9.0.3 is tested running with JDK 1.3 (you can switch the JDK for development of your project but not for running JDev).
If you want ot use JDK 1.4 get Oracle JDeveloper 9.0.4.
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P>
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drawing all entities in the solar system. Seems to be faster than
figuring out whether objects are near the player for <100 objects.
public class SolarSystem {
private static final int BIG_STARS = 20;
private static final int MAX_STARS = 1000;
private static final int STAR_AREA = 1400;
private int[][] stars;
private ArrayList entities;
private ArrayList explosions;
public SolarSystem() {
entities = new ArrayList();
explosions = new ArrayList();
this.initializeStarField();
public ArrayList getEntities() {
return entities;
public ArrayList getExplosions() {
return explosions;
public void addEntity(Entity e) {
entities.add(e);
public void removeEntity(Entity e) {
entities.remove(e);
public void addExplosion(int x, int y, int size, int max) {
// System.out.println("Adding explosion at " + x + " " + y);
explosions.add(new Explosion(x, y, size, max));
public void updateStatus(Graphics g, Ship player, int width, int height) {
this.pollEntities(player);
this.drawScene(g, player, width, height);
private void drawScene(Graphics g, Ship player, int width, int height) {
// Make sure nothing extraneous gets drawn
g.clipRect(0, 0, width, height);
// Clear the surface and set the background
g.setColor(Color.black);
g.fillRect(0, 0, width, height);
// Draw explosions & remove from the buffer if needed
Explosion[] expl = (Explosion[]) getExplosions().toArray(new Explosion[explosions.size()]);
int centerX = (int) player.getX();
int centerY = (int) player.getY();
int widthOffset = centerX + width / 2;
int heightOffset = centerY + height / 2;
this.drawStarField(g, player);
for (int i = expl.length - 1; i >= 0; i--) {
Explosion ex = expl;
g.setColor(new Color(Math.max(255 - ex.size, 0), 0, 0));
g.drawOval(ex.x - widthOffset, ex.y - heightOffset, ex.size, ex.size);
if (ex.size < ex.max) {
ex.size += 2;
ex.x--;
ex.y--;
explosions.set(i, ex);
} else {
explosions.remove(i);
// todo - can we re-use the active entities table here?
Entity[] entities = getVisibleEntities(player);
for (int i = 0; i < entities.length; i++) {
entities[i].drawEntity((int) (entities[i].getX() - player.getX() + width / 2),
(int) (entities[i].getY() - player.getY() + height / 2), g);
player.drawEntity(width / 2, height / 2, g, entities, width, height);
private void drawStarField(Graphics g, Ship player) {
g.setColor(new Color(255, 255, 255));
int starX = ((int) player.getX() % STAR_AREA);
int starY = ((int) player.getY() % STAR_AREA);
for (int i = 0; i < BIG_STARS; i++) {
g.fillOval((stars[i][0] - starX) % STAR_AREA, (stars[i][1] - starY) % STAR_AREA, 3, 3);
for (int i = BIG_STARS; i < MAX_STARS; i++) {
g.drawLine((stars[i][0] - starX) % STAR_AREA, (stars[i][1] - starY) % STAR_AREA,
(stars[i][0] - starX) % STAR_AREA, (stars[i][1] - starY) % STAR_AREA);
* Includes the player as an active entity
* @param player
* @return
private Entity[] getActiveEntities(Ship player) {
Entity[] activeEntities = (Entity[]) entities.toArray(new Entity[entities.size() + 1]);
activeEntities[activeEntities.length - 1] = player;
return activeEntities;
private void pollEntities(Ship player) {
this.purgeDestroyedObjects();
Entity[] activeEntities = this.getActiveEntities(player);
for (int i = 0; i < activeEntities.length; i++) {
activeEntities[i].resolveAction();
// todo - Handle gravitational pull
//if (activeEntities[i].hasGravitationalPull()) {
// Handle collisions
for (int i = activeEntities.length - 1; i >= 0; i--) {
if (activeEntities[i] != null && !activeEntities[i].isTransparent() && !activeEntities[i].isDestroyed()) {
for (int j = i - 1; j >= 0; j--) {
if (activeEntities[i] != null && activeEntities[j] != null &&
!activeEntities[j].isTransparent() && Tools.entitiesCollide(activeEntities[i], activeEntities[j])) {
handleCollision(activeEntities[i], activeEntities[j]);
// todo - seems redundant - remove by avoiding player ?
if (activeEntities[i].isDestroyed()) {
// System.out.println("Removing " + activeEntities[i]);
activeEntities[i] = null;
if (activeEntities[j].isDestroyed()) {
// System.out.println("Removing " + activeEntities[j]);
activeEntities[j] = null;
private void purgeDestroyedObjects() {
for (int i = entities.size() - 1; i >= 0; i--) {
if (((Entity) entities.get(i)).isDestroyed()) {
entities.remove(i);
private void handleCollision(Entity one, Entity two) {
// Base damage is a factor of total speed & angle.
double collisionFactor = Math.abs(Math.sin((one.getAccelerationAngle() - two.getAccelerationAngle()) / 2));
double explosiveDamage = 0;
if (one.explodesOnImpact()) {
one.onDestroy();
explosiveDamage += one.getExplosiveDamage();
if (two.explodesOnImpact()) {
two.onDestroy();
explosiveDamage += two.getExplosiveDamage();
one.applyDamage(explosiveDamage + (collisionFactor * two.getMass() / one.getMass()));
two.applyDamage(explosiveDamage + (collisionFactor * one.getMass() / two.getMass()));
// Introducing the FACTOR-variable also causes stickiness (two objects glued together after collision)
// FACTOR determines how much of the energy is transfered from entity 1 to 2, and how much remains
double FACTOR = 0.9;
// Don't delete v1 and a1!
double v1 = one.getSpeed();
double a1 = one.getAccelerationAngle();
double spinFactor = Math.cos(one.getAccelerationAngle() - two.getAccelerationAngle());
if (!one.isDestroyed()) {
one.setSpeed(two.getSpeed() * FACTOR + one.getSpeed() * (1 - FACTOR));
one.setAccelerationAngle(two.getAccelerationAngle());
one.applySpin(spinFactor);
if (!two.isDestroyed()) {
two.setSpeed(v1 * FACTOR + two.getSpeed() * (1 - FACTOR));
two.setAccelerationAngle(a1);
two.applySpin(-spinFactor);
public Entity[] getVisibleEntities(Entity center) {
return (Entity[]) entities.toArray(new Entity[entities.size()]);
private void initializeStarField() {
stars = new int[MAX_STARS][2];
for (int i = 0; i < MAX_STARS; i++) {
setStar(i);
private void setStar(int index) {
stars[index][0] = Tools.getRandom(STAR_AREA) + STAR_AREA;
stars[index][1] = Tools.getRandom(STAR_AREA) + STAR_AREA;
Finally, the Entity class. All in-game objects extend Entity. Rendering is done in the drawEntity-method. Each Entity has an EntityType which contains parameters like the weight, maximum acceleration and turn rate etc... Images are also stored in EntityType.
public class Entity {
public static final double TWOPI = Math.PI * 2;
protected double speed;
protected double turnRate;
protected double x, y;
protected double heading;
protected double accelerationAngle;
protected boolean destroyed = false;
protected double energy;
protected EntityType type;
private Equipment activeEquipment;
private SolarSystem solar;
public Entity(int xPos, int yPos, EntityType type, SolarSystem solar) {
this.x = xPos;
this.y = yPos;
this.type = type;
this.energy = this.getEntityType().getEnergy();
this.solar = solar;
* Basic entity drawing function doesn't taken rotation into account
public void drawEntity(int xLocation, int yLocation, Graphics g) {
if (this.getActiveEquipment() != null && this.getActiveEquipment().isActive()) {
this.getActiveEquipment().applyEffect(this, g);
// Level.getHandle().getConsole().addConsoleMessage(xLocation + "x" + yLocation);
g.drawImage(getIcon(), xLocation, yLocation, null);
public Shape getBoundingShape() {
return new Rectangle((int) getX(), (int) getY(), getWidth(), getHeight()); -
Does anyone know from where I can download the src-directory for JDK 1.4.2 ? I downloaded JDK 1.4.2 from the javasoft.com and got all directorys except that one.
multi-post http://forums.java.sun.com/thread.jsp?forum=1&thread=422755&tstart=0&trange=15
-
Installing jdk 1.4.2 and 1.5 parallel
Hello,
I would like to know it is possible to install jdk 1.5 on a windows XP machine already countaining jdk 1.4.2.
I need both versions. I want to switch between them with Eclipse build in features or by selecting the whole path to the bin folder of the target version in batch scripts.
Is this possible or does dll or registry stuff collide?
Tanks in advance.
AlexWhen you install a JDK in Windows, you are given the choice to not install a JRE (it's installed by default).
The JRE uses the Registry and also installs copies of java.exe, javaw.exe, and javaws.exe in /Windows/System32 directory. The JDK doesn't alter or install anything outside of the directory it installs into.
You can have as many JDK installs (directories) of different versions as you want, and access the programs in each with a full path to the program. You can provide the path information either from the commandline or a .bat file.
If any of the installs also install a JRE, then the Registry entries and java files in the System32 directory will be for the last version installed. There can only be one active JRE installed.
Whatever version's files are found first on the PATH environment variable's list will be the version executed when a naked java command (without the path) is issued. This also means that you will [usually] execute the version whose files are in the System32 directory, since that directory is [usually] the first directory listed in the PATh list.
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