像素編輯器的網(wǎng)格實(shí)現(xiàn)

在像素編輯器的開發(fā)中，確定實(shí)現(xiàn)適應(yīng)顏色變化的網(wǎng)格結(jié)構(gòu)的有效方法單擊和拖動(dòng)時(shí)至關(guān)重要。典型的方法是為每個(gè)單元格使用單獨(dú)的 JButton，但這可能效率低下且麻煩。

帶有圖像縮放的網(wǎng)格

另一種解決方案涉及使用 drawImage()方法通過縮放鼠標(biāo)坐標(biāo)來創(chuàng)建大像素。該技術(shù)提供了一種簡(jiǎn)單而有效的方法來同時(shí)更改多個(gè)單元格的顏色，如下所示：

<code class="java">import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import java.awt.image.BufferedImage;
import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;

/** @see http://stackoverflow.com/questions/2900801 */
public class Grid extends JPanel implements MouseMotionListener {

    private final BufferedImage img;
    private int imgW, imgH, paneW, paneH;

    public Grid(String name) {
        super(true);
        Icon icon = UIManager.getIcon(name);
        imgW = icon.getIconWidth();
        imgH = icon.getIconHeight();
        this.setPreferredSize(new Dimension(imgW * 10, imgH * 10));
        img = new BufferedImage(imgW, imgH, BufferedImage.TYPE_INT_ARGB);
        Graphics2D g2d = (Graphics2D) img.getGraphics();
        icon.paintIcon(null, g2d, 0, 0);
        g2d.dispose();
        this.addMouseMotionListener(this);
    }

    @Override
    protected void paintComponent(Graphics g) {
        paneW = this.getWidth();
        paneH = this.getHeight();
        g.drawImage(img, 0, 0, paneW, paneH, null);
    }

    @Override
    public void mouseMoved(MouseEvent e) {
        Point p = e.getPoint();
        int x = p.x * imgW / paneW;
        int y = p.y * imgH / paneH;
        int c = img.getRGB(x, y);
        this.setToolTipText(x + "," + y + ": "
            + String.format("%08X", c));
    }

    @Override
    public void mouseDragged(MouseEvent e) {
    }

    private static void create() {
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(new Grid("Tree.closedIcon"));
        f.pack();
        f.setVisible(true);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                create();
            }
        });
    }
}</code>

通過利用此技術(shù)，您可以有效地實(shí)現(xiàn)具有可調(diào)整顏色屬性的可定制網(wǎng)格系統(tǒng)，滿足像素編輯器應(yīng)用程序的要求。

以上是如何使用'drawImage()”方法實(shí)現(xiàn)像素編輯器的網(wǎng)格結(jié)構(gòu)？的詳細(xì)內(nèi)容。更多信息請(qǐng)關(guān)注PHP中文網(wǎng)其他相關(guān)文章！