本文介绍了着色BufferedImage的一个区域的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我要的颜色一个BufferedImage我的一个子领域。我是presently这样做的:
I want to color a sub area of a BufferedImage I have. I am presently doing:
public BufferedImage paintSubImage(BufferedImage img, int x, int y, int w, int h) {
Graphics g = img.getGraphics();
g.setColor(Color.BLACK);
g.fillRect(x,y,w,h);
return img;
}
但我不能上色的。我是不是做错了?
But I am not able to color it. Am I doing it wrong?
推荐答案
鉴于有很少或没有上下文去,很难确切地知道什么是错的。
Given the fact that there is little or no context to go on, it's difficult to know exactly what's wrong.
一般的经验法则不过,如果你创建/打开它,你应该配置/关闭它...
General rule of thumb though, if you create/open it, you should dispose/close it...
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class ColorMe {
public static void main(String[] args) {
new ColorMe();
}
public ColorMe() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private BufferedImage img;
public TestPane() {
try {
img = ImageIO.read(new File("/path/to/image..."));
addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
Point p = e.getPoint();
Rectangle bounds = getPictureBounds();
if (bounds.contains(p)) {
int x = p.x - bounds.x;
int y = p.y - bounds.y;
splat(img, x, y);
repaint();
}
}
});
} catch (IOException ex) {
ex.printStackTrace();
}
}
protected void splat(BufferedImage img, int x, int y) {
Graphics2D g2d = img.createGraphics();
g2d.setColor(Color.RED);
g2d.fillOval(x - 10, y - 10, 20, 20);
g2d.dispose();
}
protected Rectangle getPictureBounds() {
Rectangle bounds = new Rectangle();
if (img != null) {
bounds.x = (getWidth() - img.getWidth()) / 2;
bounds.y = (getHeight() - img.getHeight()) / 2;
bounds.width = img.getWidth();
bounds.height = img.getHeight();
}
return bounds;
}
@Override
public Dimension getPreferredSize() {
return img == null ? new Dimension(200, 200) : new Dimension(img.getWidth(), img.getHeight());
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (img != null) {
Graphics2D g2d = (Graphics2D) g.create();
Rectangle bounds = getPictureBounds();
g2d.drawImage(img, bounds.x, bounds.y, this);
g2d.dispose();
}
}
}
}
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