获取高分辨率图像从JPanel的 [英] Getting High Resolution Image from JPanel
问题描述
假设我有一个的JPanel 名为面板，并已经与的paintComponent ，我画了一些形状，如矩形。我能得到一个缓冲图像从我的面板状的：
Suppose I have a JPanel Called panel, and already with a paintComponent, I drew some shapes like rectangles. I can get a buffered image out of my panel like:
int w = panel.getWidth();
int h = panel.getHeight();
BufferedImage bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Graphics2D g = bi.createGraphics();
panel.paint(g);
ImageIO.write(bi1, "png", new File("test.png"));
我怎样才能获得高分辨率图像我的面板的？ （电流输出的图像仅仅是基于对解决我的的JPanel 在我的显示器）
How can I get a High Resolution image out of my panel? (the current output image is just based on the resolution of my JPanel in my monitor)
我试过的AffineTransform ，但它并没有做什么，我需要的。
I tried AffineTransform, but it doesn't do what I need.
请注意，我已经在我的面板，画了一切，不想改变我的画在我的的paintComponent 方法。
Note that I already drew everything in my panel, and do not want to change my drawing in my paintComponent method.
我真的寻找一条切实可行的途径和AP preciate任何帮助。
I am really searching for a practical way, and appreciate any help.
推荐答案
有可能会达到此两种可能的方式，你可以实际调整组件，或者你可以申请一个的AffineTransform 到图形的背景下，有有问题的都...
There are two possible ways you might achieve this, you could physically resize the component or you could apply an AffineTransform to the Graphics context, there are problems with both...
所以，从这个画面...
So, starting with this screen...
背景图像是相当大的下手，并已缩减（大约），以适应当前的组件中，这又是为了什么是即将到来...重要
The background image is quite large to start with and has been scaled down (roughly) to fit within the current component, this is important for what's about to come...
我再由4调整它（这个应该，大概，让你周围的300DPI）
I then resized it by 4 (this should, roughly, get you to around 300dpi)
Dimension original = tp.getSize();
System.out.println("Original = " + original);
int width = tp.getWidth() * 4;
int height = tp.getHeight() * 4;
System.out.println("Target = " + width + "x" + height);
tp.setSize(width, height);
tp.doLayout();
BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = img.createGraphics();
g2d.setRenderingHint(RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_ENABLE);
g2d.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE);
tp.print(g2d);
g2d.dispose();
tp.setSize(original);
tp.doLayout();
try {
ImageIO.write(img, "png", new File("Test.png"));
} catch (IOException ex) {
ex.printStackTrace();
}
导致...
好吧，好吧，背景图像看起来很酷，但文字是关闭...
Well, okay, the background image looks cool, but the text is off...
好了，相反，我们可以使用的AffineTransform ...
Okay, so instead, we could use an AffineTransform...
int width = tp.getWidth() * 4;
int height = tp.getHeight() * 4;
BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = img.createGraphics();
g2d.setRenderingHint(RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_ENABLE);
g2d.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE);
g2d.setTransform(AffineTransform.getScaleInstance(4, 4));
tp.print(g2d);
g2d.dispose();
try {
ImageIO.write(img, "png", new File("Test.png"));
} catch (IOException ex) {
ex.printStackTrace();
}
导致...
好吧，现在图像看起来废话和文字是好的...
Okay, now the image looks crap and the text is okay...
和参考，测试code ...
And for reference, the test code...
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.GridBagLayout;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class HiRes {
public static void main(String[] args) {
new HiRes();
}
public HiRes() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
final TestPane tp = new TestPane();
JButton print = new JButton("Print");
print.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
Dimension original = tp.getSize();
System.out.println("Original = " + original);
int width = tp.getWidth() * 4;
int height = tp.getHeight() * 4;
System.out.println("Target = " + width + "x" + height);
tp.setSize(width, height);
tp.doLayout();
BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = img.createGraphics();
g2d.setRenderingHint(RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_ENABLE);
g2d.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE);
// g2d.setTransform(AffineTransform.getScaleInstance(4, 4));
tp.print(g2d);
g2d.dispose();
tp.setSize(original);
tp.doLayout();
try {
ImageIO.write(img, "png", new File("Test.png"));
} catch (IOException ex) {
ex.printStackTrace();
}
}
});
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(tp);
frame.add(print, BorderLayout.SOUTH);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private BufferedImage background;
public TestPane() {
setLayout(new GridBagLayout());
try {
background = ImageIO.read(new File("/some/image/some/where"));
} catch (IOException ex) {
ex.printStackTrace();
}
setLayout(new GridBagLayout());
JLabel label = new JLabel("This is a test");
label.setForeground(Color.WHITE);
label.setFont(label.getFont().deriveFont(24f));
add(label);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (background != null) {
Graphics2D g2d = (Graphics2D) g.create();
Image scaled = background;
if (getWidth() < getHeight()) {
scaled = background.getScaledInstance(getWidth(), -1, Image.SCALE_SMOOTH);
} else {
scaled = background.getScaledInstance(-1, getHeight(), Image.SCALE_SMOOTH);
}
int x = (getWidth() - scaled.getWidth(this)) / 2;
int y = (getHeight() - scaled.getHeight(this)) / 2;
g2d.drawImage(scaled, x, y, this);
g2d.dispose();
}
}
}
}
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