[英]How do I get the X and Y location of an image in a JScrollPane
我正在尝试为2D RPG制作一个地图编辑器,而我目前正在尝试做的(将瓷砖放置在地面上)是带有JLabel的JScrollPane(其中包含图像)和附加的鼠标侦听器到JScrollPane以确定图像的X和Y位置。 我遇到的问题是,它没有得到图像X和Y的位置,而是得到JScrollPanes X和Y的位置。
因此,我将JScrollPane附加到512x4928的图像上,并在其上附加了鼠标侦听器。 当我尝试获取Y位置时,问题就存在了,因为JScrollPane是一个单独的对象,所以无论图像位于何处,JScrollPane的大小都为512x600,从而获得XScroll和Y的大小。 600
有什么办法可以使我工作?
继承人代码
public void loadMapTileImage(){
try {
image = ImageIO.read(getClass().getResource("data/misc/tiledata.png"));
image = image.getSubimage(0, 0, 512, 4928);
} catch (IOException e) {
e.printStackTrace();
}
ImageIcon i = new ImageIcon(image);
MapEditorGlobalObjects.mapTileScroll = new JScrollPane(new JLabel(i));
}
mapTileScroller.addMouseListener(new MouseListener() {
@Override
public void mouseReleased(MouseEvent arg0) {
MapEditorGlobalObjects.checkIfDebugging("Mouse Released Location X = "+arg0.getX());
MapEditorGlobalObjects.checkIfDebugging("Mouse Released Location Y = "+arg0.getY());
}
@Override
public void mousePressed(MouseEvent arg0) {
MapEditorGlobalObjects.checkIfDebugging("Mouse Clicked Location X = "+arg0.getX());
MapEditorGlobalObjects.checkIfDebugging("Mouse Clicked Location Y = "+arg0.getY());
}
与其将MouseListener
添加到滚动窗格中,不如将其添加到滚动窗格的视图组件中(即,滚动窗格正在显示的内容)
本示例中的图像为2560x1600
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FontMetrics;
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.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class TestScrollPanePos {
public static void main(String[] args) {
new TestScrollPanePos();
}
public TestScrollPanePos() {
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.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new JScrollPane(new TestPane()));
frame.setSize(400, 400);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private BufferedImage bg;
private Point point;
public TestPane() {
try {
bg = ImageIO.read(new File("/path/to/image));
} catch (IOException ex) {
ex.printStackTrace();
}
addMouseMotionListener(new MouseAdapter() {
@Override
public void mouseMoved(MouseEvent e) {
System.out.println(e.getPoint());
point = e.getPoint();
repaint();
}
});
}
@Override
public Dimension getPreferredSize() {
return bg == null ? new Dimension(200, 200) : new Dimension(bg.getWidth(), bg.getHeight());
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (bg != null) {
Graphics2D g2d = (Graphics2D) g.create();
int x = (getWidth() - bg.getWidth()) / 2;
int y = (getHeight()- bg.getHeight()) / 2;
g2d.drawImage(bg, x, y, this);
if (point != null) {
FontMetrics fm = g2d.getFontMetrics();
g2d.setColor(Color.BLACK);
g2d.drawString(point.x + "x" + point.y, point.x, point.y - fm.getHeight() + fm.getAscent());
}
g2d.dispose();
}
}
}
}
如果为此使用JScrollPane,则获取垂直滚动条的值,并将其添加到鼠标侦听器的Y值,您将获得正确的值
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