像素編輯器的網格實現
在像素編輯器的開發中,確定實現適應顏色變化的網格結構的有效方法單擊和拖曳時至關重要。典型的方法是為每個單元格使用單獨的 JButton,但這可能效率低且麻煩。
具有影像縮放的網格
另一種解決方案涉及使用 drawImage()方法透過縮放滑鼠座標來建立大像素。該技術提供了一種簡單而有效的方法來同時更改多個單元格的顏色,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>
透過利用此技術,您可以有效地實現具有可調整顏色屬性的可自訂網格系統,滿足像素編輯器應用程式的要求。
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