一切正常但是当我在生成图形时滚动时，滚动的部分图形会消失
MainApp.java
JPanel Canvas扩展paintComponent()。在这里，我将覆盖SwingWorker并调用draw方法来触发public class Canvas extends JPanel {
ArrayList<CAGeneration> cAGenList;
private int y,x;
private Thread t;
public static SwingWorker<Void, Void> worker;
private int count = 0;
private boolean check = false;
public CACanvas(ArrayList<CAGeneration> cAGenList) {
this.cAGenList = cAGenList;
}
@Override
public Dimension getPreferredSize() {
return new Dimension(800, 800);
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
revalidate();
if(!check){
drawCA(g, this.cAGenList);
}
}
private void drawCA(Graphics g, ArrayList<CAGeneration> cAGenList ) {
worker = new SwingWorker<Void, Void>() {
@Override
protected Void doInBackground() throws Exception {
Graphics2D g2d = (Graphics2D) g;
check = true;
y= 10;
count = 0;
synchronized (cAGenList) {
for(CAGeneration cg: cAGenList){
count++;
y = y+10;
x = 0;
if(!isCancelled()){
System.out.println(Thread.currentThread().getName());
try {
Thread.sleep(500);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
for(int i=0; i<cg.getcACell().length; i++){
x = x+10;
if (cg.getcACell()[i] == 0) {
paintRect(g2d, x, y, 9, Color.WHITE);
}
if (cg.getcACell()[i] == 1) {
paintRect(g2d, x, y, 9, Color.GRAY);
}
if (cg.getcACell()[i] == 2) {
paintRect(g2d, x, y, 9, Color.BLACK);
}
}
}
}
}
check = false;
return null;
}
};
ExecutorService threadPool = Executors.newSingleThreadExecutor();
threadPool.submit(worker);
}
private void paintRect(Graphics2D g2D, int x, int y, int size, Color color){
if(g2D!=null) g2D = (Graphics2D) getGraphics();
g2D.setColor(color);
g2D.fillRect(x, y, size, size);
}
}
绘制图形。
Canvas.java
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