有哪位高手知道怎么用JAVA实现组件的圆形布局啊

Question

有哪位高手知道怎么用JAVA实现组件的圆形布局啊？？？

Answer 1

没看懂您的意思，什么是椭圆形布局啊，把form框弄成椭圆形？还是怎么样？
没遇到过这种需求

Answer 2

参见O'Reilly的《Java Swing》

Answer 3

public class CompassButtons extends JFrame { JButton nb = new JButton("North");
JButton sb = new JButton("South");
JButton eb = new JButton("East");
JButton wb = new JButton("West");
JViewport viewport = new JViewport(); public CompassButtons() {
super("SpringLayout Compass Demo");
setSize(500, 300);
setDefaultCloseOperation(EXIT_ON_CLOSE); SpringLayout sl = new SpringLayout();
Container c = getContentPane();
c.setLayout(sl); int offset = 50; // Gap between buttons and outside edge
int w = 80; // Width of buttons
int h = 26; // Height of buttons
int border = 3; // Border around viewport Spring offsetS = Spring.constant(offset);
Spring borderS = Spring.constant(border);
Spring widthS = Spring.constant(w);
Spring halfWidthS = FractionSpring.half(widthS);
Spring heightS = Spring.constant(h);
Spring halfHeightS = FractionSpring.half(heightS);
Spring leftEdgeS = sl.getConstraint(SpringLayout.WEST, c);
Spring topEdgeS = sl.getConstraint(SpringLayout.NORTH, c);
Spring rightEdgeS = sl.getConstraint(SpringLayout.EAST, c);
Spring bottomEdgeS = sl.getConstraint(SpringLayout.SOUTH, c);
Spring xCenterS = FractionSpring.half(rightEdgeS);
Spring yCenterS = FractionSpring.half(bottomEdgeS);
Spring leftBorder = Spring.sum(leftEdgeS, borderS);
Spring topBorder = Spring.sum(topEdgeS, borderS); Spring northX = Spring.sum(xCenterS, Spring.minus(halfWidthS));
Spring southY = Spring.sum(bottomEdgeS, Spring.minus(Spring.sum(
heightS, offsetS)));
Spring eastX = Spring.sum(rightEdgeS, Spring.minus(Spring.sum(widthS,
offsetS)));
Spring eastY = Spring.sum(yCenterS, Spring.minus(halfHeightS)); c.add(nb,
new SpringLayout.Constraints(northX, offsetS, widthS, heightS));
c
.add(sb, new SpringLayout.Constraints(northX, southY, widthS,
heightS)); c.add(wb);
sl.getConstraints(wb).setX(offsetS);
sl.getConstraints(wb).setY(eastY);
sl.getConstraints(wb).setWidth(widthS);
sl.getConstraints(wb).setHeight(heightS); c.add(eb);
sl.getConstraints(eb).setX(eastX);
sl.getConstraints(eb).setY(eastY);
sl.getConstraints(eb).setWidth(widthS);
sl.getConstraints(eb).setHeight(heightS); c.add(viewport);
sl.putConstraint(SpringLayout.SOUTH, viewport, Spring.minus(borderS),
SpringLayout.SOUTH, c);
sl.putConstraint(SpringLayout.EAST, viewport, Spring.minus(borderS),
SpringLayout.EAST, c);
sl.putConstraint(SpringLayout.NORTH, viewport, topBorder,
SpringLayout.NORTH, c);
sl.putConstraint(SpringLayout.WEST, viewport, leftBorder,
SpringLayout.WEST, c); ImageIcon icon = new ImageIcon(getClass().getResource("/catalog.gif"));
viewport.setView(new JLabel(icon)); setVisible(true);
} public static void main(String args[]) {
new CompassButtons();
}
}class FractionSpring extends Spring { protected Spring parent;
protected double fraction; public FractionSpring(Spring p, double f) {
if (p == null) {
throw new NullPointerException("Parent spring cannot be null");
}
parent = p;
fraction = f;
} public int getValue() {
return (int) Math.round(parent.getValue() * fraction);
} public int getPreferredValue() {
return (int) Math.round(parent.getPreferredValue() * fraction);
} public int getMinimumValue() {
return (int) Math.round(parent.getMinimumValue() * fraction);
} public int getMaximumValue() {
return (int) Math.round(parent.getMaximumValue() * fraction);
} public void setValue(int val) {
if (val == UNSET) {
return;
}
throw new UnsupportedOperationException(
"Cannot set value on a derived spring");
} public static FractionSpring half(Spring s) {
return new FractionSpring(s, 0.5);
}
}