Possible Duplicate:
How to make an animation with Swing?
in swing, i sort an array and want to animate it. Each time i update array in a loop, i have another while loop for pausing effect and when i call repaint() which actually is not called. Why it doesn't work? Thread.sleep(1000); freezes application and doesn't resume.
public class Shape extends JPanel {
private static final long serialVersionUID = 1L;
public int col;
public JButton b2 = new JButton("Sort");
public Rectangle2D.Double table = null;
public ArrayList<Integer> arr = null;
public Shape(){
initArray(); // initialize array with random number of random numbers
table = new Rectangle2D.Double(10,10,400,400);
add(b2); // button sort
b2.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("sort it!");
Sort(arr);
display(arr);
}
});
}
public void initArray() {
col = generateRandom(10,20); // generate a random number of bars 10 - 20
arr = new ArrayList<Integer>(col);
for(int i = 0; i < col; i++){
// for each bar generate a random height 10 - 300
int h = generateRandom(10, 390);
arr.add(h);
}
}
public void paintComponent(Graphics g){
System.out.println("check");
clear(g);
Graphics2D g2d = (Graphics2D)g;
System.out.println(arr.size());
for(int j = 0; j < arr.size(); j++) {
g2d.drawRect(j*20+20,410-arr.get(j),20,arr.get(j));
}
}
protected void clear(Graphics g){
super.paintComponent(g);
}
/*
* generate random number in the range from 1 to 400
*/
private int generateRandom(int start, int end){
return new Random().nextInt(end)+start;
}
public void Sort(ArrayList<Integer> arr) {
int t = 0;
boolean swap = true;
do {
swap = false;
for(int i = 0; i < arr.size() - 1; i++) {
if(arr.get(i).compareTo(arr.get(i+1)) > 0) {
int temp = arr.get(i);
arr.set(i, arr.get(i+1));
arr.set(i+1, temp);
swap = true;
// iterate to make effect of pausing
while(t < 100) {display(arr);t++;}
t = 0;
// repaint array
repaint();
}
}
} while(swap);
}
static void display(ArrayList<Integer> arr) {
for(int i = 0; i < arr.size()-1; i++)
System.out.print(arr.get(i) + ", ");
System.out.println(arr.get(arr.size()-1));
}
public static void main(String[] arg){
WindowUtilities.openInJFrame(new Shape(), 500,500);
}
}
