我創建了一個擴展爲JPanel
的圖表,並覆蓋了paint()
方法。當我點擊這個面板時,我想創建一個圖表的「快照」,並在新的JFrame
中打開它。拍攝JPanel快照並在新窗口中顯示
我嘗試通過創建一個緩衝圖像如下所示,但問題是,當我調整窗口的大小時,我失去了很多的質量。
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.image.BufferedImage;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class SnapshotDemo extends JPanel{
private JComponent src;
private BufferedImage img;
private final JFrame f = new JFrame();
public SnapshotDemo(JComponent src) {
super(new BorderLayout());
this.src = src;
this.img = takeSnapshot(src);
}
@Override
public void paint(Graphics g) {
Graphics2D g2 = (Graphics2D)g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.drawImage(img, 0, 0, getWidth(), getHeight(), null);
}
public void display(){
f.setContentPane(this);
f.setSize(1000,600);
f.setVisible(true);
}
public static BufferedImage takeSnapshot(JComponent src){
BufferedImage i = new BufferedImage(src.getWidth(), src.getHeight(), BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = i.createGraphics();
src.printAll(g2);
return i;
}
public static void main(String[] args) {
JPanel p = new JPanel(){
@Override
public void paint(Graphics g) {
super.paint(g);
Graphics2D g2 = (Graphics2D)g.create();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
int x = 0;
int y = 0;
int stepx = getWidth()/5;
int stepy = getHeight()/5;
for(int i=0; i<10; i++){
g2.drawLine(x, y, x+stepx, y+stepy);
x+=stepx;
y+=stepy;
}
g2.setPaint(Color.red);
g2.drawOval(getWidth()/2-30, getHeight()/2-30, 60, 60);
}
};
p.addMouseListener(new MouseListener() {
@Override
public void mouseReleased(MouseEvent e) {}
@Override
public void mousePressed(MouseEvent e) {}
@Override
public void mouseExited(MouseEvent e) {}
@Override
public void mouseEntered(MouseEvent e) {}
@Override
public void mouseClicked(MouseEvent e) {
SnapshotDemo d = new SnapshotDemo(p);
d.display();
}
});
JFrame f = new JFrame();
f.setContentPane(p);
f.setSize(1000, 600);
f.setVisible(true);
}
}
有關如何更好地處理此問題的任何想法?有沒有辦法避免使用圖像(BufferedImage
等)? 在此先感謝。
拍攝圖表模型的快照並在新框架中使用此模型。 –
你能解釋一下你的意思嗎?對不起,但我不是程序員,我需要「對於傻瓜」的解釋:D – Roberto
Swing基於模型 - 視圖 - 控制器體系結構,因此視圖僅顯示模型狀態。因此,您可以拍攝模型的快照並將其與視圖的另一個實例一起使用,並且可以調整大小。有關mvc的詳細信息,請查看http://www.oracle.com/technetwork/articles/javase/index-142890.html,也許https://www.link-intersystems.com/blog/2013/07/20/the-mvc-pattern-implemented-with-java-swing/ –