屏幕上鼠标位置周围区域的缩放框
有没有办法在Java中创建一个包含e的动态缩放框。 G。光标周围20x20pix区域（但即使光标移动到应用程序框架之外）也会在小型JPanel中显示？
我在询问Color Chooser程序的背景下。需要实现的最后一个功能就是Zoom Box。
2 个答案:
答案 0 :(得分：7)
我确信有很多不同的方法可以实现。
这基本上使用一个单独的组件，它充当“缩放框”。您提供了一个要“缩放”的组件。它添加了一个鼠标监听器，因此它可以监视鼠标运动事件并进入和退出事件。
这些用于确定何时应显示“弹出窗口”，应显示弹出窗口的位置以及应该“绘制”的区域。
这使用“要缩放的组件”paint方法将其区域绘制到后备缓冲区，然后将其缩放并绘制到“缩放框”...简单
我没有玩变焦因子，所以可能还有一些怪癖，但你应该得到基本的想法......
虽然我已经提供了一个图像作为背景，但这应该适用于任何组件
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JWindow;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class ZoomBoxWindow {
public static void main(String[] args) {
new ZoomBoxWindow();
}
public ZoomBoxWindow() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
TestPane pane = new TestPane();
ZoomPane zoomPane = new ZoomPane(pane);
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(pane);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public static class ZoomPane extends JPanel {
protected static final int ZOOM_AREA = 40;
private JComponent parent;
private JWindow popup;
private BufferedImage buffer;
private float zoomLevel = 2f;
public ZoomPane(JComponent parent) {
this.parent = parent;
popup = new JWindow();
popup.setLayout(new BorderLayout());
popup.add(this);
popup.pack();
MouseAdapter ma = new MouseAdapter() {
@Override
public void mouseMoved(MouseEvent e) {
Point p = e.getPoint();
Point pos = e.getLocationOnScreen();
updateBuffer(p);
popup.setLocation(pos.x + 16, pos.y + 16);
repaint();
}
@Override
public void mouseEntered(MouseEvent e) {
popup.setVisible(true);
}
@Override
public void mouseExited(MouseEvent e) {
popup.setVisible(false);
}
};
parent.addMouseListener(ma);
parent.addMouseMotionListener(ma);
}
protected void updateBuffer(Point p) {
int width = Math.round(ZOOM_AREA);
int height = Math.round(ZOOM_AREA);
buffer = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = buffer.createGraphics();
AffineTransform at = new AffineTransform();
int xPos = (ZOOM_AREA / 2) - p.x;
int yPos = (ZOOM_AREA / 2) - p.y;
if (xPos > 0) {
xPos = 0;
}
if (yPos > 0) {
yPos = 0;
}
if ((xPos * -1) + ZOOM_AREA > parent.getWidth()) {
xPos = (parent.getWidth() - ZOOM_AREA) * -1;
}
if ((yPos * -1) + ZOOM_AREA > parent.getHeight()) {
yPos = (parent.getHeight()- ZOOM_AREA) * -1;
}
at.translate(xPos, yPos);
g2d.setTransform(at);
parent.paint(g2d);
g2d.dispose();
}
@Override
public Dimension getPreferredSize() {
return new Dimension(Math.round(ZOOM_AREA * zoomLevel), Math.round(ZOOM_AREA * zoomLevel));
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
if (buffer != null) {
AffineTransform at = g2d.getTransform();
g2d.setTransform(AffineTransform.getScaleInstance(zoomLevel, zoomLevel));
g2d.drawImage(buffer, 0, 0, this);
g2d.setTransform(at);
}
g2d.setColor(Color.RED);
g2d.drawRect(0, 0, getWidth() - 1, getHeight() - 1);
g2d.dispose();
}
}
public class TestPane extends JPanel {
private BufferedImage img;
public TestPane() {
try {
img = ImageIO.read(new File("/path/to/your/image"));
} catch (IOException ex) {
ex.printStackTrace();
}
}
@Override
public Dimension getPreferredSize() {
return img == null ? new Dimension(200, 200) : new Dimension(img.getWidth(), img.getHeight());
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (img != null) {
Graphics2D g2d = (Graphics2D) g.create();
int x = (getWidth() - img.getWidth()) / 2;
int y = (getHeight() - img.getHeight()) / 2;
g2d.drawImage(img, x, y, this);
g2d.dispose();
}
}
}
}
更新了“屏幕”版本
此版本允许您在屏幕上的任何位置显示“缩放窗口”。
这有一个小问题，你需要在捕获屏幕之前隐藏缩放窗口，然后重新显示它。
我可能很想改变这个过程，以便当updateBuffer方法检测到鼠标位置没有改变时，它会更新缓冲区并显示缩放窗口。当鼠标位置改变时，它会再次隐藏窗口......但那就是我;）
import java.awt.AWTException;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.MouseInfo;
import java.awt.Point;
import java.awt.PointerInfo;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import javax.swing.Action;
import javax.swing.JPanel;
import javax.swing.JWindow;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import static zoomboxwindow.ZoomBoxWindow.ZoomPane.ZOOM_AREA;
public class GlobalZoomBox {
public static void main(String[] args) {
new GlobalZoomBox();
}
public GlobalZoomBox() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
Zoomer zoomer = new Zoomer();
zoomer.setZoomWinodwVisible(true);
}
});
}
public class Zoomer extends JPanel {
protected static final int ZOOM_AREA = 40;
private JWindow popup;
private BufferedImage buffer;
private Robot bot;
private float zoomLevel = 2f;
private Point lastPoint;
private final Timer timer;
public Zoomer() {
popup = new JWindow();
popup.setLayout(new BorderLayout());
popup.add(this);
popup.pack();
try {
bot = new Robot();
} catch (AWTException ex) {
ex.printStackTrace();
}
timer = new Timer(125, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
updateBuffer();
}
});
timer.setCoalesce(true);
timer.setInitialDelay(0);
}
public void setZoomWinodwVisible(boolean value) {
if (value && !popup.isVisible()) {
timer.start();
popup.setVisible(true);
} else {
timer.stop();
popup.setVisible(false);
}
}
@Override
public Dimension getPreferredSize() {
return new Dimension(Math.round(ZOOM_AREA * zoomLevel), Math.round(ZOOM_AREA * zoomLevel));
}
protected void updateBuffer() {
if (bot != null) {
PointerInfo info = MouseInfo.getPointerInfo();
Point p = info.getLocation();
if (lastPoint == null || !lastPoint.equals(p)) {
int x = p.x - (ZOOM_AREA / 2);
int y = p.y - (ZOOM_AREA / 2);
popup.setLocation(p.x + 16, p.y + 16);
popup.setVisible(false);
buffer = bot.createScreenCapture(new Rectangle(x, y, ZOOM_AREA, ZOOM_AREA));
popup.setVisible(true);
lastPoint = p;
repaint();
}
}
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
if (buffer != null) {
AffineTransform at = g2d.getTransform();
g2d.setTransform(AffineTransform.getScaleInstance(zoomLevel, zoomLevel));
g2d.drawImage(buffer, 0, 0, this);
g2d.setTransform(at);
}
g2d.setColor(Color.RED);
g2d.drawRect(0, 0, getWidth() - 1, getHeight() - 1);
g2d.dispose();
}
}
}
使用“工具提示”样式弹出式更新
第二个例子的主要问题是你需要隐藏弹出窗口以获取屏幕截图。这样做是为了防止弹出窗口也被捕获。这使得每次移动鼠标时弹出窗口都会“闪烁”。
你“可以”解决这个问题，确保弹出窗口位于捕获范围之外，但随着你增加捕获区域，弹出窗口将远离光标移动。
这当然是固定位置显示的一个很好的解决方案（即，你在JFrame而不是浮动框上固定了一个面板）
这是一个额外的更新，使用第二个计时器在用户停止移动鼠标后显示缩放框。
import java.awt.AWTException;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.MouseInfo;
import java.awt.Point;
import java.awt.PointerInfo;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import javax.swing.Action;
import javax.swing.JPanel;
import javax.swing.JWindow;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import static zoomboxwindow.ZoomBoxWindow.ZoomPane.ZOOM_AREA;
public class GlobalZoomBox {
public static void main(String[] args) {
new GlobalZoomBox();
}
public GlobalZoomBox() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
Zoomer zoomer = new Zoomer();
zoomer.setZoomWinodwVisible(true);
}
});
}
public class Zoomer extends JPanel {
protected static final int ZOOM_AREA = 80;
private JWindow popup;
private BufferedImage buffer;
private Robot bot;
private float zoomLevel = 2f;
private Point lastPoint;
private final Timer timer;
private final Timer popupTimer;
public Zoomer() {
popup = new JWindow();
popup.setLayout(new BorderLayout());
popup.add(this);
popup.pack();
try {
bot = new Robot();
} catch (AWTException ex) {
ex.printStackTrace();
}
timer = new Timer(125, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
updateBuffer();
}
});
timer.setCoalesce(true);
timer.setInitialDelay(0);
popupTimer = new Timer(250, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (lastPoint != null) {
System.out.println("lastPoint = " + lastPoint);
popup.setVisible(false);
Point p = lastPoint;
int x = p.x - (ZOOM_AREA / 2);
int y = p.y - (ZOOM_AREA / 2);
popup.setLocation(p.x + 16, p.y + 16);
buffer = bot.createScreenCapture(new Rectangle(x, y, ZOOM_AREA, ZOOM_AREA));
repaint();
popup.setVisible(true);
}
}
});
popupTimer.setRepeats(false);
}
public void setZoomWinodwVisible(boolean value) {
if (value && !popup.isVisible()) {
timer.start();
popup.setVisible(true);
} else {
timer.stop();
popup.setVisible(false);
}
}
@Override
public Dimension getPreferredSize() {
return new Dimension(Math.round(ZOOM_AREA * zoomLevel), Math.round(ZOOM_AREA * zoomLevel));
}
protected void updateBuffer() {
if (bot != null) {
PointerInfo info = MouseInfo.getPointerInfo();
Point p = info.getLocation();
if (lastPoint == null || !lastPoint.equals(p)) {
lastPoint = p;
popupTimer.stop();
popup.setVisible(false);
} else {
if (!popup.isVisible()) {
popupTimer.start();
}
}
}
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
if (buffer != null) {
AffineTransform at = g2d.getTransform();
g2d.setTransform(AffineTransform.getScaleInstance(zoomLevel, zoomLevel));
g2d.drawImage(buffer, 0, 0, this);
g2d.setTransform(at);
}
g2d.setColor(Color.RED);
g2d.drawRect(0, 0, getWidth() - 1, getHeight() - 1);
g2d.dispose();
}
}
}
答案 1 :(得分：3)
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import javax.swing.*;
class ZoomOnMouse {
public static void main(String[] args) throws AWTException {
final Robot robot = new Robot();
Runnable r = new Runnable() {
@Override
public void run() {
final int size = 256;
final BufferedImage bi = new BufferedImage(
size, size, BufferedImage.TYPE_INT_RGB);
final JLabel gui = new JLabel(new ImageIcon(bi));
ActionListener zoomListener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
PointerInfo pi = MouseInfo.getPointerInfo();
Point p = pi.getLocation();
BufferedImage temp = robot.createScreenCapture(
new Rectangle(p.x-(size/4), p.y-(size/4),
(size/2), (size/2)));
Graphics g = bi.getGraphics();
g.drawImage(temp, 0, 0, size, size, null);
g.dispose();
gui.repaint();
}
};
Timer t = new Timer(40, zoomListener);
t.start();
JOptionPane.showMessageDialog(null, gui);
t.stop();
}
};
// Swing GUIs should be created and updated on the EDT
// http://docs.oracle.com/javase/tutorial/uiswing/concurrency/initial.html
SwingUtilities.invokeLater(r);
}
}
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