如何在擺動中逐漸旋轉(zhuǎn)圖像？當(dāng)用戶單擊按鈕時，我有一個正在旋轉(zhuǎn)的圖像。但這是行不通的。我想看到圖像逐漸旋轉(zhuǎn)到90度，直到它停止，但它沒有。當(dāng)點擊按鈕時，圖像必須逐漸旋轉(zhuǎn)90度。我創(chuàng)建了一個SSCCE來演示這個問題。請?zhí)鎿QCrossingPanelSSCE使用您選擇的任何圖像初始化。把圖像放進(jìn)你的images文件夾并命名為images/railCrossing.JPG.RotateButtonSSCEimport java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.Action;import javax.swing.BorderFactory;
import javax.swing.JButton;import javax.swing.JPanel;public class RotateButtonSSCE extends JPanel implements ActionListener{
private JButton rotate = new JButton("Rotate");
private VisualizationPanelSSCE vis = new VisualizationPanelSSCE();
public RotateButtonSSCE() {
this.setBorder(BorderFactory.createTitledBorder("Rotate Button "));
this.rotate.addActionListener(this);
this.add(rotate);
}
public void actionPerformed(ActionEvent ev) {
vis.rotatetheCrossing();
}}
3 回答
森林海
TA貢獻(xiàn)2011條經(jīng)驗 獲得超2個贊
始終在 事件調(diào)度線程 見下文。 阿 沙司 應(yīng)該是 簡短、獨(dú)立、正確(可編譯)，示例..為了方便起見，不需要其他人重新創(chuàng)建多個公共類；使用頂級(包私有)或嵌套類。由于這是一個圖形問題，使用一個公共的或合成的圖像，以反映您的問題。
paintComponent()
AffineTransform.
package overflow;import java.awt.*;import java.awt.event.*;import java.awt.image.BufferedImage;import java.util.Random;
import javax.swing.*;/**
* @see https://stackoverflow.com/questions/3371227
* @see https://stackoverflow.com/questions/3405799
*/public class RotateApp {
private static final int N = 3;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame();
frame.setLayout(new GridLayout(N, N, N, N));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
for (int i = 0; i < N * N; i++) {
frame.add(new RotatePanel());
}
frame.pack();
frame.setVisible(true);
}
});
}}class RotatePanel extends JPanel implements ActionListener {
private static final int SIZE = 256;
private static double DELTA_THETA = Math.PI / 90;
private final Timer timer = new Timer(25, this);
private Image image = RotatableImage.getImage(SIZE);
private double dt = DELTA_THETA;
private double theta;
public RotatePanel() {
this.setBackground(Color.lightGray);
this.setPreferredSize(new Dimension(
image.getWidth(null), image.getHeight(null)));
this.addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
image = RotatableImage.getImage(SIZE);
dt = -dt;
}
});
timer.start();
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
g2d.translate(this.getWidth() / 2, this.getHeight() / 2);
g2d.rotate(theta);
g2d.translate(-image.getWidth(this) / 2, -image.getHeight(this) / 2);
g2d.drawImage(image, 0, 0, null);
}
@Override
public void actionPerformed(ActionEvent e) {
theta += dt;
repaint();
}
@Override
public Dimension getPreferredSize() {
return new Dimension(SIZE, SIZE);
}}class RotatableImage {
private static final Random r = new Random();
static public Image getImage(int size) {
BufferedImage bi = new BufferedImage(
size, size, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = bi.createGraphics();
g2d.setRenderingHint(
RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setPaint(Color.getHSBColor(r.nextFloat(), 1, 1));
g2d.setStroke(new BasicStroke(size / 8));
g2d.drawLine(0, size / 2, size, size / 2);
g2d.drawLine(size / 2, 0, size / 2, size);
g2d.dispose();
return bi;
}}
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