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Replies:
1
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Last Post:
Jun 29, 2007 12:16 PM
by: rms7326
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Layouting components with a ratio
Posted:
Jun 29, 2007 3:07 AM
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Hello.
I have been looking over forums and every places i knew for the answer to my current problem.
I have a JPanel, using GroupLayout to handle the content. Amongst the components, i have one that ought to be layed out with a fixed ratio (width dependent on height)
Actually, i tried 'playing' with preferredSize/miniSize/maxSize, then each and every trick i could gather/discover.
I can not _unfortunatly_ apply aspect ratio to the content of my ratioed(?!) component, as the content must take all place to be visible.
Can someone help?
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Re: Layouting components with a ratio
Posted:
Jun 29, 2007 12:16 PM
in response to: pepe
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Pepe,
I solved it by overriding the sizes. See example source code below (sorry for the loss in code formatting, I don't know how to keep fixed font in these forums) for a card. Not sure if this is the best way to handle it but it works.
Michael
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
/**
* @author Michael Saunders
*/
public class CardExample
extends JComponent {
/**
*/
public CardExample() {
selected = false;
widthToHeightRatio = 2.25f/3.5f;
addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
synchronized (CardExample.this) {
selected = !selected;
CardExample.this.repaint();
}
}
});
}
/**
*/
public Dimension getClampedSize() {
Dimension result = new Dimension(super.getWidth(), super.getHeight());
Dimension min = getMinimumSize();
Dimension max = getMaximumSize();
// clamp the width
if (result.width < min.width)
result.width = min.width;
else if (result.width > max.width)
result.width = max.width;
// clamp the height
if (result.height < min.height)
result.height = min.height;
else if (result.height > max.height)
result.height = max.height;
return result;
}
/**
*/
public int getWidth() {
return calcWidth(getClampedSize());
}
/**
*/
public int getHeight() {
return calcHeight(getClampedSize());
}
/**
*/
public Dimension getMinimumSize() {
return new Dimension(100, calcHeight(100));
}
/**
*/
public Dimension getMaximumSize() {
return new Dimension(200, calcHeight(200));
}
/**
*/
public Dimension getPreferredSize() {
return new Dimension(150, calcHeight(150));
}
/**
*/
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.setClip(null); // clear all clipping
g.setColor(java.awt.Color.RED);//getBackground());
int regionWidth = super.getWidth();
int regionHeight = super.getHeight();
g.fillRect(0, 0, regionWidth, regionHeight);
if (isSelected())
g.setColor(java.awt.Color.BLUE);
else
g.setColor(java.awt.Color.CYAN);
int width = getWidth();
int height = getHeight();
int hGap = (regionWidth - width);
int vGap = (regionHeight - height);
int left = (int)(hGap * getAlignmentX());
int top = (int)(vGap * getAlignmentY());
g.fillRect(left, top, width, height);
g.setColor(java.awt.Color.BLACK);
g.drawLine(left, top, left+width, top+height);
g.drawLine(left, top+height, left+width, top);
}
/**
*/
private boolean isSelected() {
return selected;
}
/**
*/
private int calcWidth(int height) {
return (int)(height * widthToHeightRatio);
}
/**
*/
private int calcWidth(Dimension size) {
int result;
if (size.width / widthToHeightRatio > size.height)
result = calcWidth(size.height);
else
result = size.width;
return result;
}
/**
*/
private int calcHeight(int width) {
return (int)(width / widthToHeightRatio);
}
/**
*/
private int calcHeight(Dimension size) {
int result;
if (size.height * widthToHeightRatio > size.width)
result = calcHeight(size.width);
else
result = size.height;
return result;
}
private boolean selected;
private float widthToHeightRatio;
}
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