すべての計算を行うには時間がかかりすぎるため、コンポーネントの増分表示を実行しようとしています。グラフィック インターフェイスをフリーズしたくないので、2.3 秒ごとに画像 (フラクタル) を表示したいと思います。すべてのポイントを計算する関数は compute です。インクリメンタル表示を作成する前に、このメソッドはすべてのポイントを計算していました。今では10000ポイントしか計算されません。
クラスFlameBuilderPreviewComponent
:
Timer timer1=new Timer(1000,new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
time=time+10000;
fa= builder.build().compute(density,frame,getWidth(),getHeight(),accumulator);
}
});
timer1.start();
for (int z = 0; z <fa.height(); z++) {
for (int j = 0; j < fa.width(); j++) {
image.setRGB(j,z,fa.color(palette, background, j, fa.height()-1-z).asPackedRGB());
}
}
g0.drawImage(image,0,0,null);
if (time>density*getWidth()*getHeight()){
timer1.stop();
}
次に、プログラムの他の部分はGUIインターフェイスです。別のタイマーを置きます。これは、画像の再描画を担当します。
クラスFlameMakerGUI
:
fBPC=new FlameBuilderPreviewComponent(builder, background, palette, r1, density);
Timer timer = new Timer(2500,new ActionListener(){
public void actionPerformed(ActionEvent e) {
fBPC.repaint();
System.out.println("titi");
}
});
timer.start();
fractale.add(fBPC,BorderLayout.CENTER);
次に、タイマーが実行されるたびにプログラムが表示するエラーは次のとおりです。
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at ch.epfl.flamemaker.gui.FlameBuilderPreviewComponent.paintComponent(FlameBuilderPreviewComponent.java:82)
at javax.swing.JComponent.paint(JComponent.java:1054)
at javax.swing.JComponent.paintChildren(JComponent.java:887)
at javax.swing.JComponent.paint(JComponent.java:1063)
at javax.swing.JComponent.paintToOffscreen(JComponent.java:5221)
at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(RepaintManager.java:1512)
at javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1443)
at javax.swing.RepaintManager.paint(RepaintManager.java:1236)
at javax.swing.JComponent._paintImmediately(JComponent.java:5169)
at javax.swing.JComponent.paintImmediately(JComponent.java:4980)
at javax.swing.RepaintManager$3.run(RepaintManager.java:796)
at javax.swing.RepaintManager$3.run(RepaintManager.java:784)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:784)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:757)
at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:706)
at javax.swing.RepaintManager.access$1000(RepaintManager.java:62)
at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1651)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:727)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:688)
at java.awt.EventQueue$3.run(EventQueue.java:686)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:697)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
助けてくれてありがとう