有没有办法创建一个功能,允许用户在视力受损时切换屏幕放大倍率。
我在像eclipse这样的程序的环境中询问,视觉障碍的用户可以打开和关闭放大文本,图标和导航栏的功能。
答案 0 :(得分:5)
在裁剪图像时,我将此短代码用于一般放大镜。
import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import javax.swing.*;
class ZoomOnMouse {
Robot robot;
int zoomFactor = 2;
PointerInfo pi;
JPanel gui;
JLabel output;
Timer t;
public ZoomOnMouse() throws AWTException {
robot = new Robot();
gui = new JPanel(new BorderLayout(2, 2));
output = new JLabel("Point at something to see it zoomed!");
gui.add(output, BorderLayout.PAGE_END);
final int size = 256;
final BufferedImage bi = new BufferedImage(
size, size, BufferedImage.TYPE_INT_RGB);
final JLabel zoomLabel = new JLabel(new ImageIcon(bi));
gui.add(zoomLabel, BorderLayout.CENTER);
MouseListener factorListener = new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
if (zoomFactor == 2) {
zoomFactor = 4;
} else if (zoomFactor == 4) {
zoomFactor = 8;
} else if (zoomFactor == 8) {
zoomFactor = 2;
}
showInfo();
}
};
zoomLabel.addMouseListener(factorListener);
ActionListener zoomListener = (ActionEvent e) -> {
pi = MouseInfo.getPointerInfo();
Point p = pi.getLocation();
Rectangle r = new Rectangle(
p.x - (size / (2 * zoomFactor)),
p.y - (size / (2 * zoomFactor)),
(size / zoomFactor),
(size / zoomFactor));
BufferedImage temp = robot.createScreenCapture(r);
Graphics g = bi.getGraphics();
g.drawImage(temp, 0, 0, size, size, null);
g.setColor(new Color(255,0,0,128));
int x = (size/2)-1;
int y = (size/2)-1;
g.drawLine(0,y,size,y);
g.drawLine(x,0,x,size);
g.dispose();
zoomLabel.repaint();
showInfo();
};
t = new Timer(40, zoomListener);
t.start();
}
public void stop() {
t.stop();
}
public Component getGui() {
return gui;
}
public void showInfo() {
pi = MouseInfo.getPointerInfo();
output.setText("Zoom: " + zoomFactor + " Point: " + pi.getLocation());
}
public static void main(String[] args) {
Runnable r = () -> {
try {
final ZoomOnMouse zm = new ZoomOnMouse();
final JFrame f = new JFrame("Mouse Zoom");
f.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
f.add(zm.getGui());
f.setResizable(false);
f.pack();
f.setLocationByPlatform(true);
f.setAlwaysOnTop(true);
f.setVisible(true);
WindowListener closeListener = new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
zm.stop();
f.dispose();
}
};
f.addWindowListener(closeListener);
} catch (AWTException e) {
e.printStackTrace();
}
};
// Swing GUIs should be created and updated on the EDT
// http://docs.oracle.com/javase/tutorial/uiswing/concurrency/initial.html
SwingUtilities.invokeLater(r);
}
}