Java 如何在mxgraph中相对于鼠标位置进行缩放?
现在,我可以在不使用mxgraph的情况下根据以下内容进行相对于鼠标位置的缩放: 示例代码如下:Java 如何在mxgraph中相对于鼠标位置进行缩放?,java,mxgraph,jgraph,Java,Mxgraph,Jgraph,现在,我可以在不使用mxgraph的情况下根据以下内容进行相对于鼠标位置的缩放: 示例代码如下: package test; import java.awt.*; import java.awt.event.*; import java.awt.geom.*; import javax.swing.*; public class FPanel extends javax.swing.JPanel { private Dimension preferredSize = new Dimens
package test;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import javax.swing.*;
public class FPanel extends javax.swing.JPanel {
private Dimension preferredSize = new Dimension(400, 400);
private Rectangle2D[] rects = new Rectangle2D[50];
public static void main(String[] args) {
JFrame jf = new JFrame("test");
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jf.setSize(400, 400);
jf.add(new JScrollPane(new FPanel()));
jf.setVisible(true);
}
public FPanel() {
// generate rectangles with pseudo-random coords
for (int i=0; i<rects.length; i++) {
rects[i] = new Rectangle2D.Double(
Math.random()*.8, Math.random()*.8,
Math.random()*.2, Math.random()*.2);
}
// mouse listener to detect scrollwheel events
addMouseWheelListener(new MouseWheelListener() {
public void mouseWheelMoved(MouseWheelEvent e) {
updatePreferredSize(e.getWheelRotation(), e.getPoint());
}
});
}
private void updatePreferredSize(int n, Point p) {
double d = (double) n * 1.08;
d = (n > 0) ? 1 / d : -d;
int w = (int) (getWidth() * d);
int h = (int) (getHeight() * d);
preferredSize.setSize(w, h);
int offX = (int)(p.x * d) - p.x;
int offY = (int)(p.y * d) - p.y;
setLocation(getLocation().x-offX,getLocation().y-offY);
getParent().doLayout();
}
public Dimension getPreferredSize() {
return preferredSize;
}
private Rectangle2D r = new Rectangle2D.Float();
public void paint(Graphics g) {
super.paint(g);
g.setColor(Color.red);
int w = getWidth();
int h = getHeight();
for (Rectangle2D rect : rects) {
r.setRect(rect.getX() * w, rect.getY() * h,
rect.getWidth() * w, rect.getHeight() * h);
((Graphics2D)g).draw(r);
}
}
}
现在我想在mxgraph中实现它。到目前为止,我所做的正在改变getPageTranslate(新比例)
在mxgraph中,并使其返回
int offX = (int)(p.x * d) - p.x;
int offY = (int)(p.y * d) - p.y;
return new mxPoint(offX,offY)
因此,它不起作用。
我想mxgraph中的scaleAndTranslate(新的Scale,translate.getX(),translate.getY())
是解决这个问题的关键
非常感谢您的帮助
int offX = (int)(p.x * d) - p.x;
int offY = (int)(p.y * d) - p.y;
return new mxPoint(offX,offY)