翻转形状（不图） [英] Flipping shape (not image)
本文介绍了翻转形状（不图）的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
解决：
由于@MadProgrammer
Solved: Thanks @MadProgrammer
我换成 g2.rotate（Math.toRadians（180.0））; 按 g2.scale（1，-1）; 感谢^^
我写的程序，以显示与镜面数字时钟（垂直翻转）
I wrote program to show Digital Clock with mirror (Vertical Flip)
这是我的code
import java.awt.*;
import java.awt.font.GlyphVector;
import javax.swing.*;
import java.util.*;
public class DigitalClock extends JFrame implements Runnable {
/**
* @author HASSAN
*/
Thread runner; // declare global objects
Font clockFont;
Shape mirror;
public DigitalClock() {
super("Digital Clock - Hassan Sharaf 12MCMB33");
setSize(600, 500);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
setResizable(false); // create window
setLocationRelativeTo(null);
clockFont = new Font("digifacewide", Font.BOLD, 100); // create font
Container contentArea = getContentPane();
ClockPanel timeDisplay = new ClockPanel();
contentArea.add(timeDisplay); // add components
setContentPane(contentArea);
start(); // start thread running
}
public class ClockPanel extends JPanel {
public void paintComponent(Graphics painter) {
// super.paintComponent(painter);
Graphics2D g2 = (Graphics2D) painter;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setFont(clockFont); // create clock components
g2.setColor(Color.black);
g2.drawString(timeNow(), 20, 140);
GlyphVector v = clockFont.createGlyphVector(getFontMetrics(clockFont).getFontRenderContext(), timeNow());
mirror = v.getOutline();
g2.translate(553, 160);
g2.rotate(Math.toRadians(180.0));
g2.fill(mirror);
g2.draw(mirror);
}
}
// get current time
public String timeNow() {
Calendar now = Calendar.getInstance();
int hrs = now.get(Calendar.HOUR_OF_DAY);
int min = now.get(Calendar.MINUTE);
int sec = now.get(Calendar.SECOND);
String time = zero(hrs) + ":" + zero(min) + ":" + zero(sec);
return time;
}
public String zero(int num) {
String number = (num < 10) ? ("0" + num) : ("" + num);
return number; // Add leading zero if needed
}
public void start() {
if (runner == null) {
runner = new Thread(this);
}
runner.start();
// method to start thread
}
public void run() {
while (runner == Thread.currentThread()) {
repaint();
// define thread task
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
System.out.println("Thread failed");
}
}
}
// create main method
public static void main(String[] args) {
DigitalClock clock = new DigitalClock();
}
}
问题：我用rotate（）方法，但实际上我不想旋转我要垂直翻转时钟
问：如何翻转形状的（不图片）
Problem: I used rotate() method, but actually I don't want rotate the clock I want flip it vertically Question: How can I flip the shape (not image)?
推荐答案
您已经取决于你想要达到什么......很多-O-选择
You have lots-o-choices depending on what you want to achieve...
您可以...
- 从图形对象创建一个
的PathIterator，使用的AffineTransform符合旋转的要求。这将要求您创建一个新的路径，追加的PathIterator来，所以你可以画它...或者 - 创建一个新的
Path2D使用形状旋转为基础的新路径，传递的AffineTransform给它。这是pretty大致相同第一个选项，但需要较少的code ...
- Create a
PathIteratorfrom the shape object, using aAffineTransformmatching your rotational requirements. This will require you to create a new path, appending thePathIteratorto it so you can paint it ... or - Create a new
Path2Dusing the shape to be rotated as the base for the new path and passing theAffineTransformto it. This is pretty much the same as the first option, but requires less code...
下面是一个例子....
Here's an example....
public class SpinningTriangle {
public static void main(String[] args) {
new SpinningTriangle();
}
public SpinningTriangle() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new SpinPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class SpinPane extends JPanel {
private Triangle triangle;
private float angle = 0;
public SpinPane() {
triangle = new Triangle(50, 100);
Timer timer = new Timer(40, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
angle += 2;
repaint();
}
});
timer.setRepeats(true);
timer.setCoalesce(true);
timer.start();
}
@Override
public Dimension getPreferredSize() {
return new Dimension(110, 110);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
Rectangle bounds = triangle.getBounds();
// PathIterator pi = triangle.getPathIterator(AffineTransform.getRotateInstance(Math.toRadians(angle), bounds.width / 2, bounds.height / 2));
// Path2D path = new Path2D.Float();
// path.append(pi, true);
Path2D path = new Path2D.Float(triangle, AffineTransform.getRotateInstance(Math.toRadians(angle), bounds.width / 2, bounds.height / 2));
int x = (getWidth() - bounds.width) / 2;
int y = (getHeight() - bounds.height) / 2;
g2d.translate(x, y);
g2d.setColor(Color.RED);
g2d.fill(path);
g2d.setColor(Color.YELLOW);
g2d.draw(path);
g2d.dispose();
}
}
public class Triangle extends Path2D.Float {
public Triangle(int width, int height) {
moveTo(width / 2f, 0);
lineTo(width, height);
lineTo(0, height);
closePath();
}
}
}
更新时间：
如果你想要做的是镜子的形状，你可以通过扩展 1 ...
If all you want to do is "mirror" the shape, you can scale the axis by -1...
public class SpinningTriangle {
public static void main(String[] args) {
new SpinningTriangle();
}
public SpinningTriangle() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new FlipPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class FlipPane extends JPanel {
private Triangle triangle;
private boolean flip;
public FlipPane() {
triangle = new Triangle(50, 100);
Timer timer = new Timer(500, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
flip = !flip;
repaint();
}
});
timer.setRepeats(true);
timer.setCoalesce(true);
timer.start();
}
@Override
public Dimension getPreferredSize() {
return new Dimension(110, 110);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
Rectangle bounds = triangle.getBounds();
double scale = 1 * (flip ? -1 : 1);
Path2D path = new Path2D.Float(triangle, AffineTransform.getScaleInstance(scale, scale));
int x = (getWidth() - bounds.width) / 2;
int y = (getHeight() - bounds.height) / 2;
if (flip) {
y += bounds.height;
x += bounds.width;
}
g2d.translate(x, y);
g2d.setColor(Color.RED);
g2d.fill(path);
g2d.setColor(Color.YELLOW);
g2d.draw(path);
g2d.dispose();
}
}
public class Triangle extends Path2D.Float {
public Triangle(int width, int height) {
moveTo(width / 2f, 0);
lineTo(width, height);
lineTo(0, height);
closePath();
}
}
}
这篇关于翻转形状（不图）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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