绘制边界矩形以选择要记录的区域 [英] Drawing a bounding rectangle to select what area to record
本文介绍了绘制边界矩形以选择要记录的区域的处理方法，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
我如何绘制屏幕上的半透明矩形？
这不能是 JFrame 因为JFrames在右上角有通常的关闭，最小化，最大化选项。
如果它确实是一个摆动能干，如何在空气中画出来？不插入 JFrame 无论如何？
请告诉我它是什么以及我如何实现它...
How do I draw that semi-transparent rectangle on the screen?
That cannot be a JFrame because JFrames have the usual close, minimize, maximize options in top right.
if it is indeed a swing competent, How is it drawn in thin air? Without inserting it in a JFrame whatsoever?
Please tell me what it is and how I can implement it...
推荐答案
直接的想法来到请注意使用 java。 awt.Robot 捕获屏幕截图，将其绘制到无框窗口。从那里你可以简单地画一个矩形
The immediate idea that comes to mind is to use java.awt.Robot to capture a screen shot, paint that to frameless window. From there you can simply draw a rectangle on it
用例子更新
......花了一些时间......
... Took some time ...
public class SelectionRectangle {
public static void main(String[] args) {
new SelectionRectangle();
}
public SelectionRectangle() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Test");
frame.setUndecorated(true);
frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new BackgroundPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class BackgroundPane extends JPanel {
private BufferedImage background;
private Point mouseAnchor;
private Point dragPoint;
private SelectionPane selectionPane;
public BackgroundPane() {
selectionPane = new SelectionPane();
try {
Robot bot = new Robot();
background = bot.createScreenCapture(getScreenViewableBounds());
} catch (AWTException ex) {
Logger.getLogger(SelectionRectangle.class.getName()).log(Level.SEVERE, null, ex);
}
selectionPane = new SelectionPane();
setLayout(null);
add(selectionPane);
MouseAdapter adapter = new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
mouseAnchor = e.getPoint();
dragPoint = null;
selectionPane.setLocation(mouseAnchor);
selectionPane.setSize(0, 0);
}
@Override
public void mouseDragged(MouseEvent e) {
dragPoint = e.getPoint();
int width = dragPoint.x - mouseAnchor.x;
int height = dragPoint.y - mouseAnchor.y;
int x = mouseAnchor.x;
int y = mouseAnchor.y;
if (width < 0) {
x = dragPoint.x;
width *= -1;
}
if (height < 0) {
y = dragPoint.y;
height *= -1;
}
selectionPane.setBounds(x, y, width, height);
selectionPane.revalidate();
repaint();
}
};
addMouseListener(adapter);
addMouseMotionListener(adapter);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
g2d.drawImage(background, 0, 0, this);
g2d.dispose();
}
}
public class SelectionPane extends JPanel {
private JButton button;
private JLabel label;
public SelectionPane() {
button = new JButton("Close");
setOpaque(false);
label = new JLabel("Rectangle");
label.setOpaque(true);
label.setBorder(new EmptyBorder(4, 4, 4, 4));
label.setBackground(Color.GRAY);
label.setForeground(Color.WHITE);
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
add(label, gbc);
gbc.gridy++;
add(button, gbc);
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
SwingUtilities.getWindowAncestor(SelectionPane.this).dispose();
}
});
addComponentListener(new ComponentAdapter() {
@Override
public void componentResized(ComponentEvent e) {
label.setText("Rectangle " + getX() + "x" + getY() + "x" + getWidth() + "x" + getHeight());
}
});
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
g2d.setColor(new Color(128, 128, 128, 64));
g2d.fillRect(0, 0, getWidth(), getHeight());
float dash1[] = {10.0f};
BasicStroke dashed =
new BasicStroke(3.0f,
BasicStroke.CAP_BUTT,
BasicStroke.JOIN_MITER,
10.0f, dash1, 0.0f);
g2d.setColor(Color.BLACK);
g2d.setStroke(dashed);
g2d.drawRect(0, 0, getWidth() - 3, getHeight() - 3);
g2d.dispose();
}
}
public static Rectangle getScreenViewableBounds() {
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice gd = ge.getDefaultScreenDevice();
return getScreenViewableBounds(gd);
}
public static Rectangle getScreenViewableBounds(GraphicsDevice gd) {
Rectangle bounds = new Rectangle(0, 0, 0, 0);
if (gd != null) {
GraphicsConfiguration gc = gd.getDefaultConfiguration();
bounds = gc.getBounds();
Insets insets = Toolkit.getDefaultToolkit().getScreenInsets(gc);
bounds.x += insets.left;
bounds.y += insets.top;
bounds.width -= (insets.left + insets.right);
bounds.height -= (insets.top + insets.bottom);
}
return bounds;
}
}
使用SnipIt更新示例
有些人建议在屏幕顶部放置一个透明窗口，这实际上是行不通的，因为透明窗口实际上并没有响应鼠标点击，除非他们有一些东西可以在他们身上绘制，这将允许捕获鼠标事件。
Some people have suggested using a transparent window laid over the top of the screen, this actually won't work, as transparent windows don't actually respond to mouse clicks UNLESS they have something to be painted on them that will allow the mouse event to be trapped.
还有人建议你使用Window作为选择机制，这是一个但是，有效的答案，我会（个人）发现这是一个不合适的解决方案，因为您希望用户只需单击并拖动选择矩形（恕我直言）。
It's also been suggested that you use a Window as the selection mechanism, this is a valid answer, however, I would (personally) find that to be an unsuitable solution, as you want the user to simply click and drag the selection rectangle (IMHO).
另一种方法是使用像SnipIt这样的东西。
Another approach is use something like SnipIt.
public class SnipIt {
public static void main(String[] args) {
new SnipIt();
}
public SnipIt() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame();
frame.setUndecorated(true);
// This works differently under Java 6
frame.setBackground(new Color(0, 0, 0, 0));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new SnipItPane());
frame.setBounds(getVirtualBounds());
frame.setVisible(true);
}
});
}
public class SnipItPane extends JPanel {
private Point mouseAnchor;
private Point dragPoint;
private SelectionPane selectionPane;
public SnipItPane() {
setOpaque(false);
setLayout(null);
selectionPane = new SelectionPane();
add(selectionPane);
MouseAdapter adapter = new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
mouseAnchor = e.getPoint();
dragPoint = null;
selectionPane.setLocation(mouseAnchor);
selectionPane.setSize(0, 0);
}
@Override
public void mouseDragged(MouseEvent e) {
dragPoint = e.getPoint();
int width = dragPoint.x - mouseAnchor.x;
int height = dragPoint.y - mouseAnchor.y;
int x = mouseAnchor.x;
int y = mouseAnchor.y;
if (width < 0) {
x = dragPoint.x;
width *= -1;
}
if (height < 0) {
y = dragPoint.y;
height *= -1;
}
selectionPane.setBounds(x, y, width, height);
selectionPane.revalidate();
repaint();
}
};
addMouseListener(adapter);
addMouseMotionListener(adapter);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
Rectangle bounds = new Rectangle(0, 0, getWidth(), getHeight());
Area area = new Area(bounds);
area.subtract(new Area(selectionPane.getBounds()));
g2d.setColor(new Color(192, 192, 192, 64));
g2d.fill(area);
}
}
public class SelectionPane extends JPanel {
private JButton button;
private JLabel label;
public SelectionPane() {
button = new JButton("Close");
setOpaque(false);
label = new JLabel("Rectangle");
label.setOpaque(true);
label.setBorder(new EmptyBorder(4, 4, 4, 4));
label.setBackground(Color.GRAY);
label.setForeground(Color.WHITE);
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
add(label, gbc);
gbc.gridy++;
add(button, gbc);
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
SwingUtilities.getWindowAncestor(SelectionPane.this).dispose();
}
});
addComponentListener(new ComponentAdapter() {
@Override
public void componentResized(ComponentEvent e) {
label.setText("Rectangle " + getX() + "x" + getY() + "x" + getWidth() + "x" + getHeight());
}
});
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
// I've chosen NOT to fill this selection rectangle, so that
// it now appears as if you're "cutting" away the selection
// g2d.setColor(new Color(128, 128, 128, 64));
// g2d.fillRect(0, 0, getWidth(), getHeight());
float dash1[] = {10.0f};
BasicStroke dashed =
new BasicStroke(3.0f,
BasicStroke.CAP_BUTT,
BasicStroke.JOIN_MITER,
10.0f, dash1, 0.0f);
g2d.setColor(Color.BLACK);
g2d.setStroke(dashed);
g2d.drawRect(0, 0, getWidth() - 3, getHeight() - 3);
g2d.dispose();
}
}
public static Rectangle getVirtualBounds() {
Rectangle bounds = new Rectangle(0, 0, 0, 0);
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice lstGDs[] = ge.getScreenDevices();
for (GraphicsDevice gd : lstGDs) {
bounds.add(gd.getDefaultConfiguration().getBounds());
}
return bounds;
}
}
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