java 摇摆背景图像
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java swing background image
提问by Nilesh
I am using JFrame and I have kept a background image on my frame. Now the problem is that the size of image is smaller then the size of the frame so i have to keep the same image once again on the empty part of the window. If user clicks maximize button than I may have to put the image on empty region of the frame at run time. Can anyone tell me how to accomplish this?
我正在使用 JFrame，并且在我的框架上保留了一个背景图像。现在的问题是图像的大小小于框架的大小，所以我必须再次在窗口的空白部分保持相同的图像。如果用户单击最大化按钮，我可能必须在运行时将图像放在框架的空白区域。谁能告诉我如何做到这一点？
采纳答案by Tobias Schulte
You want something like the background image of the windows desktop, when using the background image multiple times instead of resizing it or just display it centered?
当多次使用背景图像而不是调整其大小或仅居中显示时，您想要类似 Windows 桌面的背景图像吗？
You only have to keep the image once and just paint it multiple times in the paintComponent method.
您只需要保留一次图像，然后在paintComponent 方法中多次绘制它。
回答by finnw
It sounds as though you are talking about tiling vs. stretching, though it's not clear which behaviour you want.
听起来好像您在谈论平铺与拉伸，尽管尚不清楚您想要哪种行为。
This program has examples of both:
这个程序有两个例子：
import java.awt.BorderLayout;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.AbstractAction;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Main {
public static void main(String[] args) throws IOException {
final Image image = ImageIO.read(new URL("http://sstatic.net/so/img/logo.png"));
final JFrame frame = new JFrame();
frame.add(new ImagePanel(image));
frame.setSize(800, 600);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
@SuppressWarnings("serial")
class ImagePanel extends JPanel {
private Image image;
private boolean tile;
ImagePanel(Image image) {
this.image = image;
this.tile = false;
final JCheckBox checkBox = new JCheckBox();
checkBox.setAction(new AbstractAction("Tile") {
public void actionPerformed(ActionEvent e) {
tile = checkBox.isSelected();
repaint();
}
});
add(checkBox, BorderLayout.SOUTH);
};
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
if (tile) {
int iw = image.getWidth(this);
int ih = image.getHeight(this);
if (iw > 0 && ih > 0) {
for (int x = 0; x < getWidth(); x += iw) {
for (int y = 0; y < getHeight(); y += ih) {
g.drawImage(image, x, y, iw, ih, this);
}
}
}
} else {
g.drawImage(image, 0, 0, getWidth(), getHeight(), this);
}
}
}
回答by IvanRF
Another way to tile an image is with TexturePaint:
另一种平铺图像的方法是TexturePaint：
public class TexturePanel extends JPanel {
private TexturePaint paint;
public TexturePanel(BufferedImage bi) {
super();
this.paint = new TexturePaint(bi, new Rectangle(0, 0, bi.getWidth(), bi.getHeight()));
}
@Override
protected void paintComponent(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
g2.setPaint(paint);
g2.fill(new Rectangle(0, 0, getWidth(), getHeight()));
}
}
