怎么才可以选中JTextPane中插入的ImageIcon,可以拉伸改变其大小?

[Chuyun130]

如题

[Chuyun130]

再顶一下

[amdgaming]

不太会 。。。

[daisycool]

这个有点复杂。因为Component并没有默认的拉伸事件监听。给你提供个思路吧。

建一个继承ImageIcon的类，比如说叫MyImage，里面监听MouseMotionEvent.mouseMoved事件，判断鼠标的坐标，比如说是
(0, 0)--(5, 5)这个范围的话，鼠标光标变成NW箭头，
(width-5, 0)--(width, 5)的话变成NE箭头
(0, height-5)--(5, height)的话变成SW箭头
(width-5, height-5)--(width, height)的话变成SE箭头

这些是鼠标在四角位置的判断。

在调用这个MyImage类的时候，为其添加MouseEvent，监听其MouseDragged事件，根据鼠标所在位置决定是哪一点的坐标如何变化。四个角需要单独照顾到。

逻辑上不复杂，实现起来代码稍微有点繁琐，主要是判断鼠标所在的角，和鼠标移动时图片的尺寸和坐标应该怎么设置。

[daisycool]

不好意思，上面判断四角的坐标可能不对，更正一下
左上：(0,0)--(5,5)
右上：(width,0)--(width-5,5)
左下：(0,height)--(5,height-5)
右下：(width,height)--(width-5,height-5)

[windforcecn]

package testGUI;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.JFrame;

public class TestImage extends JFrame {

	private static final long serialVersionUID = 1L;

	private static final String filename = "C:/1.jpg";

	private volatile BufferedImage image = null;

	public TestImage() {
		init();
	}

	private void init() {
		this.getContentPane().setLayout(new BorderLayout());
		this.setSize(new Dimension(800, 600));
		this.setDefaultCloseOperation(EXIT_ON_CLOSE);
		this.addComponentListener(new MyAdapter(this));
		this.setVisible(true);
	}

	public BufferedImage getImage(boolean reload) {
		if (image == null || reload) {
			try {
				image = ImageIO.read(new File(filename));
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return image;
	}

	public void resize(int height, int width, boolean bb) {
		try {
			double ratio = 0.0;
			File f = new File(filename);
			BufferedImage bi = getImage(false);
			Image itemp = getImage(false).getScaledInstance(width, height,
					BufferedImage.SCALE_SMOOTH);
			if ((bi.getHeight() > height) || (bi.getWidth() > width)) {
				if (bi.getHeight() > bi.getWidth()) {
					ratio = (new Integer(height)).doubleValue()
							/ bi.getHeight();
				} else {
					ratio = (new Integer(width)).doubleValue() / bi.getWidth();
				}
				AffineTransformOp op = new AffineTransformOp(AffineTransform
						.getScaleInstance(ratio, ratio), null);
				itemp = op.filter(bi, null);
			}
			if (bb) {
				BufferedImage image = new BufferedImage(width, height,
						BufferedImage.TYPE_INT_RGB);
				Graphics2D g = image.createGraphics();
				g.setColor(Color.white);
				g.fillRect(0, 0, width, height);
				if (width == itemp.getWidth(null))
					g.drawImage(itemp, 0, (height - itemp.getHeight(null)) / 2,
							itemp.getWidth(null), itemp.getHeight(null),
							Color.white, null);
				else
					g.drawImage(itemp, (width - itemp.getWidth(null)) / 2, 0,
							itemp.getWidth(null), itemp.getHeight(null),
							Color.white, null);
				g.dispose();
				itemp = image;
			}
			ImageIO.write((BufferedImage) itemp, "jpg", f);
			TestImage.this.getGraphics().drawImage(getImage(true), this.getX(),
					this.getY(), TestImage.this);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public void paint(Graphics g) {
		super.paint(g);
		g.drawImage(getImage(false), this.getX(), this.getY(), this);
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		new TestImage();
	}
}

class MyAdapter extends ComponentAdapter {
	TestImage adaptee;

	MyAdapter(TestImage adaptee) {
		this.adaptee = adaptee;
	}

	public void componentResized(ComponentEvent e) {
		adaptee.resize(adaptee.getHeight(), adaptee.getWidth(), true);
	}
}

[amdgaming]

学习 ing

[stanley3319]

高招ㄚ 收下了~~THX

[SWAINY]

学习ing