图片为JScrollBar

Question

我正在处理像素艺术编辑器，我遇到了JScrollBar的问题。

问题是：

我在滚动条轨道上渲染图像，但它每次都会拉伸，所以我必须绘制超过30个单独的滚动条轨道图像，我想知道是否可以创建一个图像并使其尺寸合适

package oktay.notepad.GUI;

import oktay.notepad.ColorSheme;
import oktay.notepad.Main;

import javax.imageio.ImageIO;
import javax.swing.*;
import javax.swing.plaf.basic.BasicScrollBarUI;
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.image.BufferedImage;
import java.io.IOException;

/**
 * Created by asame on 08.06.2017.
 */
public class UIScrollBar extends BasicScrollBarUI implements MouseListener {

   public UIScrollBar() {

   }

   @Override
   protected void paintTrack(Graphics g, JComponent c, Rectangle trackBounds) {
       try {

           g.drawImage(ImageIO.read(ClassLoader.getSystemResource("res/icons/scrolltrack.pn   g")), trackBounds.x, trackBounds.y, trackBounds.width, trackBounds.height, null);

       } catch (IOException e) {
        e.printStackTrace();
       }
   }

    @Override
    protected void paintThumb(Graphics g, JComponent c, Rectangle thumbBounds) {
    super.paintThumb(g, c, thumbBounds);
    }

    @Override
    public void mouseClicked(MouseEvent e) {

    }

    @Override
    public void mousePressed(MouseEvent e) {

    }

    @Override
    public void mouseReleased(MouseEvent e) {

    }

    @Override
    public void mouseEntered(MouseEvent e) {

    }

    @Override
    public void mouseExited(MouseEvent e) {

    }

}

---------------------- CustomScrollBar类----------------------- -----

package oktay.notepad.GUI;

import javax.swing.*;

/**
 * Created by asame on 21.06.2017.
 */
public class CustomScrollBar extends JScrollBar {

    public CustomScrollBar() {
        setUI(new UIScrollBar());
    }

}

---------------------- CustomScrollPane类----------------------- ---

package oktay.notepad.GUI;

import javax.swing.*;
import java.awt.*;

/**
 * Created by asame on 21.06.2017.
 */
public class CustomScrollPane extends JScrollPane {

    public CustomScrollPane () {
        super (VERTICAL_SCROLLBAR_ALWAYS, HORIZONTAL_SCROLLBAR_ALWAYS);
        //setUI(new UIScrollPane());
        setHorizontalScrollBar(new CustomScrollBar());
        setVerticalScrollBar(new CustomScrollBar());
    }
}

感谢您的帮助

Answer 1

您可以使用TexturePaint，如下所示：

BufferedImage bi = ImageIO.read(ClassLoader.getSystemResource("res/icons/scrolltrack.png"));
TexturePaint paint = new TexturePaint(bi, new Rectangle(0, 0, bi.getWidth(), bi.getHeight()));
Graphics2D g2 = (Graphics2D) g;
g2.setPaint(paint);
g2.fill(new Rectangle(trackBounds.x, trackBounds.y, trackBounds.width, trackBounds.height));