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JPanel problem
Joined: 17 Apr 2004
Posts: 28
JPanel problem
I`m having a problem with my JPanel. I tell it to repaint() at the end
of the constructor and then I have animation (one sprite moving on the
screen), but the JPanel doesn`t paint itself until the sprite has gone
through its animation and reached its new point on the screen. I pasted
my code below. I`ve never used a JPanel for custom graphics before.
What am I doing wrong?
-Michael Sullivan-
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.util.*;
import javax.swing.*;
class Battle extends JPanel implements KeyListener
{
AllyParty ap;
boolean showMenu = false;
BufferedImage image;
EnemyParty ep;
Graphics screen;
Image allyPic[], enemyPic[];
int enemyCount;
int mtCount = 0;
int turn[];
MediaTracker mt;
Random rand;
public Battle (AllyParty allyparty)
{
/*Initial JPanel subclass setup*/
setSize(800, 600);
setBackground(Color.black);
/*Create our ally party*/
ap = new AllyParty();
ap = allyparty;
ap.setCallingObject(this);
/*Create randomizer and random number variable*/
long seed = System.currentTimeMillis();
rand = new Random(seed);
/*Use rand to select a number of enemies*/
enemyCount = rand.nextInt(12) + 1;
enemyCount = 12; //TEMP
ep = new EnemyParty(enemyCount);
/*Create the individual enemies in ep and place them*/
for (int i = 0; i < enemyCount; i++)
ep.enemy[i] = new Enemy(1);
ep.setCallingObject(this);
/*Initialize images and set them to their starting values*/
allyPic = new Image[4];
enemyPic = new Image[enemyCount];
/* for (int i = 0; i < 4; i++)
{
ap.ally[i].setCurrentImage(Ally.STAND)
allyPic[i] = ap.ally[i].getCurrentImage();
}
for (int i = 0; i < enemyCount; i++)
{
enemyPic[i] = ep.enemy[i].getImage();
*/
/*Set battle placement*/
ap.setPos(0);
ep.setPos(0);
//Create the Buffered Image
image = new BufferedImage(800, 600, BufferedImage.TYPE_INT_RGB);
//Set up the Media Tracker
mt = new MediaTracker(this);
for (int i = 0; i < 4; i++)
mt.addImage(allyPic[i], mtCount++);
for (int i = 0; i < ep.getEnemyCount(); i++)
mt.addImage(enemyPic[i], mtCount++);
mt.addImage(image, mtCount++);
try { mt.waitForAll(); } catch (Exception e) {}
/*Temporary Section*/
findTurns();
repaint();
// ap.ally[0].advance();
advance();
}
public void findTurns()
{
int total = ep.getEnemyCount() + 4; //Enemies + allies
int used[] = new int[total];
turn = new int[total];
int next = rand.nextInt(total);
for (int j = 0; j < total; j++)
used[j] = -1;
for (int j = 0; j < total; j++)
{
for (int k = 0; k < j; k++)
{
if (used[k] == next)
{
k = -1;
next = rand.nextInt(total);
}
}
turn[j] = next;
used[j] = next;
}
}
public void advance()
{
while (ap.ally[0].getXPos() > 350)
{
ap.ally[0].moveLeft(20);
ap.ally[0].setCurrentImage(Ally.WALK);
repaint();
try { Thread.sleep(200); } catch (Exception e) {}
ap.ally[0].setCurrentImage(Ally.STAND);
repaint();
try { Thread.sleep(200); } catch (Exception e) {}
}
}
public void paintComponent (Graphics g)
{
super.paintComponent(g);
screen = image.getGraphics();
for (int i = 0; i < 4; i++)
allyPic[i] = ap.ally[i].getCurrentImage();
for (int i = 0; i < ep.getEnemyCount(); i++)
enemyPic[i] = ep.enemy[i].getCurrentImage();
for (int i = 0; i < 4; i++)
screen.drawImage(allyPic[i], ap.ally[i].getXPos(),
ap.ally[i].getYPos(), this);
for (int i = 0; i < enemyCount; i++)
screen.drawImage(enemyPic[i], ep.enemy[i].getXPos(),
ep.enemy[i].getYPos(), 100, 75, this);
g.drawImage(image, 0, 0, this);
}
public void keyPressed (KeyEvent k) {}
public void keyReleased (KeyEvent k) {}
public void keyTyped (KeyEvent k) {}
}
Joined: 17 Apr 2004
Posts: 28
JPanel problem
I think I`ve isolated the problem. Being new to Swing I didn`t realize
that Thread.sleep(int) was not swing friendly. I`ve decided to
implement a javax.swing.timer to repaint the JPanel. The problem is I
can`t think of anything to keep my animation paused until the user has
had time to see the new frame. I was using Thread.sleep(200) for this,
but I can`t use Thread.sleep in a Swing interface because it ties up the
entire program. I`ve tried while (someBoolean == false) {}, but that
had the same effect as Thread.sleep(). Any ideas on how to do this?
I`ve pasted my new code snippets below.
-Michael Sullivan-
doNow = new ActionListener()
{
public void actionPerformed(ActionEvent evt)
{
repaint();
}
};
timer = new javax.swing.Timer(200, doNow);
timer.start();
advance();
public void advance()
{
while (ap.ally[0].getXPos() > 350)
{
ap.ally[0].moveLeft(20);
ap.ally[0].setCurrentImage(Ally.WALK);
//Need to wait at this point for user to see new image
ap.ally[0].setCurrentImage(Ally.STAND);
repaint();
//Likewise here;
}
}
On Sun, 2004-04-25 at 23:27, Michael Sullivan wrote:
> I`m having a problem with my JPanel. I tell it to repaint() at the end
> of the constructor and then I have animation (one sprite moving on the
> screen), but the JPanel doesn`t paint itself until the sprite has gone
> through its animation and reached its new point on the screen. I pasted
> my code below. I`ve never used a JPanel for custom graphics before.
> What am I doing wrong?
>
> -Michael Sullivan-
>
> import java.awt.*;
> import java.awt.event.*;
> import java.awt.image.*;
> import java.util.*;
> import javax.swing.*;
>
> class Battle extends JPanel implements KeyListener
> {
> AllyParty ap;
>
> boolean showMenu = false;
>
> BufferedImage image;
>
> EnemyParty ep;
>
> Graphics screen;
>
> Image allyPic[], enemyPic[];
>
> int enemyCount;
> int mtCount = 0;
> int turn[];
>
> MediaTracker mt;
>
> Random rand;
>
> public Battle (AllyParty allyparty)
> {
>
> /*Initial JPanel subclass setup*/
> setSize(800, 600);
> setBackground(Color.black);
>
> /*Create our ally party*/
> ap = new AllyParty();
> ap = allyparty;
> ap.setCallingObject(this);
>
> /*Create randomizer and random number variable*/
> long seed = System.currentTimeMillis();
> rand = new Random(seed);
>
> /*Use rand to select a number of enemies*/
> enemyCount = rand.nextInt(12) + 1;
>
> enemyCount = 12; //TEMP
> ep = new EnemyParty(enemyCount);
>
>
> /*Create the individual enemies in ep and place them*/
> for (int i = 0; i < enemyCount; i++)
> ep.enemy[i] = new Enemy(1);
>
> ep.setCallingObject(this);
>
>
>
>
> /*Initialize images and set them to their starting values*/
> allyPic = new Image[4];
> enemyPic = new Image[enemyCount];
>
> /* for (int i = 0; i < 4; i++)
> {
> ap.ally[i].setCurrentImage(Ally.STAND)
> allyPic[i] = ap.ally[i].getCurrentImage();
> }
>
> for (int i = 0; i < enemyCount; i++)
> {
> enemyPic[i] = ep.enemy[i].getImage();
> */
> /*Set battle placement*/
> ap.setPos(0);
> ep.setPos(0);
>
> //Create the Buffered Image
> image = new BufferedImage(800, 600, BufferedImage.TYPE_INT_RGB);
>
> //Set up the Media Tracker
> mt = new MediaTracker(this);
> for (int i = 0; i < 4; i++)
> mt.addImage(allyPic[i], mtCount++);
>
> for (int i = 0; i < ep.getEnemyCount(); i++)
> mt.addImage(enemyPic[i], mtCount++);
>
> mt.addImage(image, mtCount++);
>
> try { mt.waitForAll(); } catch (Exception e) {}
>
> /*Temporary Section*/
> findTurns();
>
> repaint();
> // ap.ally[0].advance();
> advance();
> }
>
> public void findTurns()
> {
> int total = ep.getEnemyCount() + 4; //Enemies + allies
>
> int used[] = new int[total];
> turn = new int[total];
>
> int next = rand.nextInt(total);
>
> for (int j = 0; j < total; j++)
> used[j] = -1;
>
> for (int j = 0; j < total; j++)
> {
> for (int k = 0; k < j; k++)
> {
> if (used[k] == next)
> {
> k = -1;
> next = rand.nextInt(total);
> }
> }
>
> turn[j] = next;
> used[j] = next;
>
> }
> }
>
> public void advance()
> {
> while (ap.ally[0].getXPos() > 350)
> {
> ap.ally[0].moveLeft(20);
> ap.ally[0].setCurrentImage(Ally.WALK);
> repaint();
> try { Thread.sleep(200); } catch (Exception e) {}
> ap.ally[0].setCurrentImage(Ally.STAND);
> repaint();
> try { Thread.sleep(200); } catch (Exception e) {}
> }
> }
>
>
> public void paintComponent (Graphics g)
> {
> super.paintComponent(g);
> screen = image.getGraphics();
>
> for (int i = 0; i < 4; i++)
> allyPic[i] = ap.ally[i].getCurrentImage();
>
> for (int i = 0; i < ep.getEnemyCount(); i++)
> enemyPic[i] = ep.enemy[i].getCurrentImage();
>
> for (int i = 0; i < 4; i++)
> screen.drawImage(allyPic[i], ap.ally[i].getXPos(),
> ap.ally[i].getYPos(), this);
>
> for (int i = 0; i < enemyCount; i++)
> screen.drawImage(enemyPic[i], ep.enemy[i].getXPos(),
> ep.enemy[i].getYPos(), 100, 75, this);
>
> g.drawImage(image, 0, 0, this);
> }
>
>
>
>
> public void keyPressed (KeyEvent k) {}
> public void keyReleased (KeyEvent k) {}
> public void keyTyped (KeyEvent k) {}
> }
>
Joined: 16 Apr 2004
Posts: 15
JPanel problem
I would say read up on invokeLater() method. I never got it straight,
but I believe it might help you some ...
>>> michael@... 4/26/2004 10:20:59 AM >>>
I think I`ve isolated the problem. Being new to Swing I didn`t
realize
that Thread.sleep(int) was not swing friendly. I`ve decided to
implement a javax.swing.timer to repaint the JPanel. The problem is I
can`t think of anything to keep my animation paused until the user has
had time to see the new frame. I was using Thread.sleep(200) for
this,
but I can`t use Thread.sleep in a Swing interface because it ties up
the
entire program. I`ve tried while (someBoolean == false) {}, but that
had the same effect as Thread.sleep(). Any ideas on how to do this?
I`ve pasted my new code snippets below.
-Michael Sullivan-
doNow = new ActionListener()
{
public void actionPerformed(ActionEvent evt)
{
repaint();
}
};
timer = new javax.swing.Timer(200, doNow);
timer.start();
advance();
public void advance()
{
while (ap.ally[0].getXPos() > 350)
{
ap.ally[0].moveLeft(20);
ap.ally[0].setCurrentImage(Ally.WALK);
//Need to wait at this point for user to see new image
ap.ally[0].setCurrentImage(Ally.STAND);
repaint();
//Likewise here;
}
}
On Sun, 2004-04-25 at 23:27, Michael Sullivan wrote:
> I`m having a problem with my JPanel. I tell it to repaint() at the
end
> of the constructor and then I have animation (one sprite moving on
the
> screen), but the JPanel doesn`t paint itself until the sprite has
gone
> through its animation and reached its new point on the screen. I
pasted
> my code below. I`ve never used a JPanel for custom graphics before.
> What am I doing wrong?
>
> -Michael Sullivan-
>
> import java.awt.*;
> import java.awt.event.*;
> import java.awt.image.*;
> import java.util.*;
> import javax.swing.*;
>
> class Battle extends JPanel implements KeyListener
> {
> AllyParty ap;
>
> boolean showMenu = false;
>
> BufferedImage image;
>
> EnemyParty ep;
>
> Graphics screen;
>
> Image allyPic[], enemyPic[];
>
> int enemyCount;
> int mtCount = 0;
> int turn[];
>
> MediaTracker mt;
>
> Random rand;
>
> public Battle (AllyParty allyparty)
> {
>
> /*Initial JPanel subclass setup*/
> setSize(800, 600);
> setBackground(Color.black);
>
> /*Create our ally party*/
> ap = new AllyParty();
> ap = allyparty;
> ap.setCallingObject(this);
>
> /*Create randomizer and random number variable*/
> long seed = System.currentTimeMillis();
> rand = new Random(seed);
>
> /*Use rand to select a number of enemies*/
> enemyCount = rand.nextInt(12) + 1;
>
> enemyCount = 12; //TEMP
> ep = new EnemyParty(enemyCount);
>
>
> /*Create the individual enemies in ep and place them*/
> for (int i = 0; i < enemyCount; i++)
> ep.enemy[i] = new Enemy(1);
>
> ep.setCallingObject(this);
>
>
>
>
> /*Initialize images and set them to their starting values*/
> allyPic = new Image[4];
> enemyPic = new Image[enemyCount];
>
> /* for (int i = 0; i < 4; i++)
> {
> ap.ally[i].setCurrentImage(Ally.STAND)
> allyPic[i] = ap.ally[i].getCurrentImage();
> }
>
> for (int i = 0; i < enemyCount; i++)
> {
> enemyPic[i] = ep.enemy[i].getImage();
> */
> /*Set battle placement*/
> ap.setPos(0);
> ep.setPos(0);
>
> //Create the Buffered Image
> image = new BufferedImage(800, 600,
BufferedImage.TYPE_INT_RGB);
>
> //Set up the Media Tracker
> mt = new MediaTracker(this);
> for (int i = 0; i < 4; i++)
> mt.addImage(allyPic[i], mtCount++);
>
> for (int i = 0; i < ep.getEnemyCount(); i++)
> mt.addImage(enemyPic[i], mtCount++);
>
> mt.addImage(image, mtCount++);
>
> try { mt.waitForAll(); } catch (Exception e) {}
>
> /*Temporary Section*/
> findTurns();
>
> repaint();
> // ap.ally[0].advance();
> advance();
> }
>
> public void findTurns()
> {
> int total = ep.getEnemyCount() + 4; //Enemies + allies
>
> int used[] = new int[total];
> turn = new int[total];
>
> int next = rand.nextInt(total);
>
> for (int j = 0; j < total; j++)
> used[j] = -1;
>
> for (int j = 0; j < total; j++)
> {
> for (int k = 0; k < j; k++)
> {
> if (used[k] == next)
> {
> k = -1;
> next = rand.nextInt(total);
> }
> }
>
> turn[j] = next;
> used[j] = next;
>
> }
> }
>
> public void advance()
> {
> while (ap.ally[0].getXPos() > 350)
> {
> ap.ally[0].moveLeft(20);
> ap.ally[0].setCurrentImage(Ally.WALK);
> repaint();
> try { Thread.sleep(200); } catch (Exception e) {}
> ap.ally[0].setCurrentImage(Ally.STAND);
> repaint();
> try { Thread.sleep(200); } catch (Exception e) {}
> }
> }
>
>
> public void paintComponent (Graphics g)
> {
> super.paintComponent(g);
> screen = image.getGraphics();
>
> for (int i = 0; i < 4; i++)
> allyPic[i] = ap.ally[i].getCurrentImage();
>
> for (int i = 0; i < ep.getEnemyCount(); i++)
> enemyPic[i] = ep.enemy[i].getCurrentImage();
>
> for (int i = 0; i < 4; i++)
> screen.drawImage(allyPic[i], ap.ally[i].getXPos(),
> ap.ally[i].getYPos(), this);
>
> for (int i = 0; i < enemyCount; i++)
> screen.drawImage(enemyPic[i], ep.enemy[i].getXPos(),
> ep.enemy[i].getYPos(), 100, 75, this);
>
> g.drawImage(image, 0, 0, this);
> }
>
>
>
>
> public void keyPressed (KeyEvent k) {}
> public void keyReleased (KeyEvent k) {}
> public void keyTyped (KeyEvent k) {}
> }
>
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