[英]Create rectangle with mouse drag, not draw
我想用整個屏幕創建一個矩形。 通過使用整個屏幕,我的意思是這樣的:
首先,在Java中是否可以使用整個屏幕? 第二,我該怎么做呢? 另一件事,我不想繪制一個實際的矩形,我想創建on,就像在新的java.awt.Rectangle
。
nb-首先要注意的是,這是使用Java 7完成的,在Java 6中創建透明窗口的方式不同,在更新10之下是不可能的(我相信)
基本上,這會創建一個透明窗口,其大小和位置可以覆蓋整個虛擬屏幕(也就是說,如果您有多個屏幕,它將覆蓋所有虛擬屏幕)。
然后我使用JPanel
作為主要容器來捕獲鼠標事件並執行繪制效果。
面板是透明的。 這允許面板(和框架)下方的任何東西保持可見。 然后我用透明的顏色畫了這個(我這樣做只是為了強調事實)。
單擊並拖動某個區域時,它將被暴露。
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.geom.Area;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class MySnipTool {
public static void main(String[] args) {
new MySnipTool();
}
public MySnipTool() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setUndecorated(true);
frame.setBackground(new Color(0, 0, 0, 0));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new CapturePane());
Rectangle bounds = getVirtualBounds();
frame.setLocation(bounds.getLocation());
frame.setSize(bounds.getSize());
frame.setAlwaysOnTop(true);
frame.setVisible(true);
}
});
}
public class CapturePane extends JPanel {
private Rectangle selectionBounds;
private Point clickPoint;
public CapturePane() {
setOpaque(false);
MouseAdapter mouseHandler = new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
if (SwingUtilities.isLeftMouseButton(e) && e.getClickCount() == 2) {
System.exit(0);
}
}
@Override
public void mousePressed(MouseEvent e) {
clickPoint = e.getPoint();
selectionBounds = null;
}
@Override
public void mouseReleased(MouseEvent e) {
clickPoint = null;
}
@Override
public void mouseDragged(MouseEvent e) {
Point dragPoint = e.getPoint();
int x = Math.min(clickPoint.x, dragPoint.x);
int y = Math.min(clickPoint.y, dragPoint.y);
int width = Math.max(clickPoint.x - dragPoint.x, dragPoint.x - clickPoint.x);
int height = Math.max(clickPoint.y - dragPoint.y, dragPoint.y - clickPoint.y);
selectionBounds = new Rectangle(x, y, width, height);
repaint();
}
};
addMouseListener(mouseHandler);
addMouseMotionListener(mouseHandler);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
g2d.setColor(new Color(255, 255, 255, 128));
Area fill = new Area(new Rectangle(new Point(0, 0), getSize()));
if (selectionBounds != null) {
fill.subtract(new Area(selectionBounds));
}
g2d.fill(fill);
if (selectionBounds != null) {
g2d.setColor(Color.BLACK);
g2d.draw(selectionBounds);
}
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;
}
}
同樣,您可以創建一個用戶可以調整大小的透明框架。 您將負責自己實施所有調整大小的代碼,但解決方案仍然是可行的。
更新
您可能還需要檢查操作系統/硬件是否可以支持透明度...
GraphicsConfiguration config = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().getDefaultConfiguration();
if (!AWTUtilities.isTranslucencyCapable(config)) {
System.out.println("Transluceny is not supported");
}
if (!AWTUtilities.isTranslucencySupported(AWTUtilities.Translucency.PERPIXEL_TRANSPARENT)) {
System.out.println("PerPeixel Transparency is not supported");
}
更新了替代方法
這是解決問題的另一種方法。 基本上它需要快速拍攝屏幕並將其渲染到窗口。 這樣我們就可以根據需要控制突出顯示/選擇。
這樣做的缺點是它是一個靜態結果,你不會得到任何當前正在運行的動畫效果。
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.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.HeadlessException;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class SnipWithScreenShoot {
public static void main(String[] args) {
new SnipWithScreenShoot();
}
public SnipWithScreenShoot() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException ex) {
} catch (InstantiationException ex) {
} catch (IllegalAccessException ex) {
} catch (UnsupportedLookAndFeelException ex) {
}
try {
JFrame frame = new JFrame("Test");
frame.setUndecorated(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
} catch (AWTException exp) {
exp.printStackTrace();
System.out.println("That sucks");
}
}
});
}
public class TestPane extends JPanel {
private BufferedImage image;
private Rectangle selection;
public TestPane() throws AWTException {
Robot bot = new Robot();
image = bot.createScreenCapture(getVirtualBounds());
MouseAdapter handler = new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
selection = new Rectangle(e.getPoint());
repaint();
}
@Override
public void mouseDragged(MouseEvent e) {
Point p = e.getPoint();
int width = Math.max(selection.x - e.getX(), e.getX() - selection.x);
int height = Math.max(selection.y - e.getY(), e.getY() - selection.y);
selection.setSize(width, height);
repaint();
}
};
addMouseListener(handler);
addMouseMotionListener(handler);
}
@Override
public Dimension getPreferredSize() {
return image == null ? super.getPreferredSize() : new Dimension(image.getWidth(), image.getHeight());
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (image != null) {
Graphics2D g2d = (Graphics2D) g.create();
g2d.drawImage(image, WIDTH, 0, this);
if (selection != null) {
g2d.setColor(new Color(225, 225, 255, 128));
g2d.fill(selection);
g2d.setColor(Color.GRAY);
g2d.draw(selection);
}
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;
}
}
你可以考慮創建一個透明的全屏JFrame。但這不是一個理想的技術。
您可以查看此內容 ,以便開始使用真正的解決方案。
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