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我想知道如何管理值來動態改變JFrame的背景顏色，現在我只能從綠色變爲藍色，反之亦然;這是我需要的顏色：如何知道r，g，b值用於獲取其他顏色動態繪製JFrame？
這些顏色的RGB可以發現here
這裏有一個如何從綠色變爲我的示例代碼動態爲藍色：
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
public class ChangeColor {
public ChangeColor() {
JFrame frame = new JFrame();
frame.add(new ColorPanel());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public class ColorPanel extends JPanel {
private static final int DELAY = 30;
private static final int INCREMENT = 15;
private Color currentColor = Color.BLUE;
boolean isBlue = true;
boolean isGreen = false;
private int r,g,b;
private Timer timer = null;
private JButton greenButton = null;
private JButton blueButton = null;
public ColorPanel() {
r = 0; g = 0; b = 255;
greenButton = createGreenButton();
blueButton = createBlueButton();
timer = new Timer(DELAY, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (isBlue) {
if (b == 0) {
stopTimer();
enableButtons();
} else {
blueToGreen();
setColor(new Color(r, b, g));
}
}
if (isGreen) {
if (g == 0) {
stopTimer();
enableButtons();
} else {
greenToBlue();
setColor(new Color(r, b, g));
}
}
repaint();
}
});
add(blueButton);
add(greenButton);
}
public JButton createBlueButton() {
JButton button = new JButton("BLUE");
button.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
if (currentColor != new Color(0, 255, 0)) {
System.out.println("turn blue");
isBlue = true;
isGreen = false;
diableButtons();
startTimer();
}
}
});
return button;
}
public void diableButtons() {
blueButton.setEnabled(false);
greenButton.setEnabled(false);
}
public void enableButtons() {
blueButton.setEnabled(true);
greenButton.setEnabled(true);
}
public JButton createGreenButton() {
JButton button = new JButton("GREEN");
button.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
if (currentColor != new Color(0, 0, 255)) {
System.out.println("turn green");
isGreen = true;
isBlue = false;
diableButtons();
startTimer();
}
}
});
return button;
}
private void blueToGreen() {
b -= INCREMENT;
g += INCREMENT;
}
private void greenToBlue() {
g -= INCREMENT;
b += INCREMENT;
}
public void setColor(Color color) {
this.currentColor = color;
}
public void startTimer() {
timer.start();
}
public void stopTimer() {
timer.stop();
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(currentColor);
g.fillRect(0, 0, getWidth(), getHeight());
}
@Override
public Dimension getPreferredSize() {
return new Dimension(300, 300);
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable(){
@Override
public void run() {
new ChangeColor();
}
});
}
}
代碼有一些錯誤，這是不是最可靠的代碼，所以，如果你能改善它，我會很感謝
這裏的示例代碼的輸出：
創建的顏色列表，然後遍歷它。 –
你能舉個例子嗎？:) –
這是你的練習;） –