[英]Java: A defined paint method for my frame won't call repaint() when referenced from another class
我試圖從另一個類調用此構造函數,但是當我創建新線程時,它永遠不會調用重繪。 如果我只是從類中的main方法調用run()方法,則它的工作原理與預期的完全一樣。 看來我的repaint()方法沒有從另一個類中調用。 我擔心我的另一個班級仍在進行計算,但是即使將其放入線程中,我也沒有運氣。
碼:
public class MakeTransparent implements Runnable{
private int i;
private static int dollars;
private float transparency;
public MakeTransparent(int dollars){
this.setDollars(dollars);
this.transparency = 1;
this.i = 300;
}
@Override
public void run() {
JFrame frame = new JFrame("Tiddlybiscuits"){
private static final long serialVersionUID = 1L;
public void paint(Graphics arg0) {
Graphics2D g2 = (Graphics2D)arg0;
super.paint(g2);
g2.setColor(getBackground());
g2.fillRect(0, 0, this.getWidth(),this.getHeight());
g2.setColor(Color.CYAN);
g2.setFont(g2.getFont().deriveFont(50, 200F));
//System.out.println(arg0.getFontMetrics());
String string = "+$";
Composite c = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, getTransparency());
g2.setComposite(c);
g2.drawString(string + getDollars(), 30, getI());
try {Thread.sleep(40);} catch (InterruptedException e) {}
setI(getI()-5);
setTransparency(getTransparency()-.03f);
repaint();
}
};
frame.setSize(500,500);
frame.setLocationRelativeTo(null);
frame.setUndecorated(true);
frame.setBackground(new Color(1,55,134,0));
frame.setLayout(null);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
try { Thread.sleep(1400); } catch (InterruptedException e) { }
frame.dispose();
}
Thread.sleep
EVER repaint
方法,這將導致無限的更新循環,最終將占用您的CPU JFrame
類的頂級容器的paint
,除了不進行雙重緩沖外,大多數窗口還包含其他組件( JRootPane
, contentPane
, glassPane
),所有這些組件都可能干擾您嘗試繪制的內容 看一眼:
有關如何在框架要求內工作的更多詳細信息和想法
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Composite;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
TestPane tp = new TestPane();
Timer timer = new Timer(40, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
float t = tp.getTransparancy() - 0.03f;
if (t < 0) {
t = 0;
((Timer)e.getSource()).stop();
}
int i = tp.getI();
tp.setI(i - 1);
System.out.println(t);
tp.setTransparancy(t);
}
});
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(tp);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
timer.start();
}
});
}
public class TestPane extends JPanel {
private float transparancy = 1f;
private int i = 200;
private int dollars;
public TestPane() {
}
@Override
public Dimension getPreferredSize() {
return new Dimension(400, 200);
}
public void setTransparancy(float value) {
if (transparancy != value) {
float old = transparancy;
this.transparancy = value;
firePropertyChange("transparancy", old, transparancy);
repaint();
}
}
public float getTransparancy() {
return transparancy;
}
public int getDollars() {
return dollars;
}
public int getI() {
return i;
}
public void setI(int value) {
if (i != value) {
float old = i;
this.i = value;
firePropertyChange("i", old, i);
repaint();
}
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
g2d.setColor(getBackground());
g2d.fillRect(0, 0, this.getWidth(), this.getHeight());
g2d.setColor(Color.CYAN);
g2d.setFont(g2d.getFont().deriveFont(50, 200F));
//System.out.println(arg0.getFontMetrics());
String string = "+$";
Composite c = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, getTransparancy());
g2d.setComposite(c);
g2d.drawString(string + getDollars(), 30, getI());
g2d.dispose();
}
}
}
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