CircleLayoutTest.java Source code

Introduction

Here is the source code for CircleLayoutTest.java

Source

import java.awt.Button;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Insets;
import java.awt.LayoutManager;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JFrame;

public class CircleLayoutTest extends JFrame {
    public CircleLayoutTest() {
        setTitle("CircleLayoutTest");
        setSize(300, 300);
        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });

        getContentPane().setLayout(new CircleLayout());
        getContentPane().add(new Button("3"));
        getContentPane().add(new Button("4"));
        getContentPane().add(new Button("5"));
        getContentPane().add(new Button("6"));
        getContentPane().add(new Button("7"));
        getContentPane().add(new Button("8"));
        getContentPane().add(new Button("9"));
        getContentPane().add(new Button("10"));
        getContentPane().add(new Button("11"));
        getContentPane().add(new Button("12"));
        getContentPane().add(new Button("1"));
        getContentPane().add(new Button("2"));
    }

    public static void main(String[] args) {
        JFrame f = new CircleLayoutTest();
        f.show();
    }

}

class CircleLayout implements LayoutManager {
    private int minWidth = 0;

    private int minHeight = 0;

    private int preferredWidth = 0, preferredHeight = 0;

    private boolean sizesSet = false;

    private int maxComponentWidth = 0;

    private int maxComponentHeight = 0;

    public void addLayoutComponent(String name, Component comp) {
    }

    public void removeLayoutComponent(Component comp) {
    }

    public void setSizes(Container parent) {
        if (sizesSet)
            return;
        int comCount = parent.getComponentCount();

        for (int i = 0; i < comCount; i++) {
            Component c = parent.getComponent(i);
            if (c.isVisible()) {
                Dimension size = c.getPreferredSize();
                maxComponentWidth = Math.max(maxComponentWidth, size.width);
                maxComponentHeight = Math.max(maxComponentWidth, size.height);
                preferredHeight += size.height;
            }
        }
        preferredHeight += maxComponentHeight;
        preferredWidth = 2 * maxComponentWidth;
        minHeight = preferredHeight;
        minWidth = preferredWidth;
        sizesSet = true;
    }

    public Dimension preferredLayoutSize(Container parent) {
        Dimension dim = new Dimension(0, 0);
        setSizes(parent);
        Insets insets = parent.getInsets();
        dim.width = preferredWidth + insets.left + insets.right;
        dim.height = preferredHeight + insets.top + insets.bottom;
        return dim;
    }

    public Dimension minimumLayoutSize(Container parent) {
        return preferredLayoutSize(parent);
    }

    public void layoutContainer(Container parent) {
        Insets insets = parent.getInsets();
        int containerWidth = parent.getSize().width - insets.left - insets.right;
        int containerHeight = parent.getSize().height - insets.top - insets.bottom;
        int xradius = (containerWidth - maxComponentWidth) / 2;
        int yradius = (containerHeight - maxComponentHeight) / 2;

        setSizes(parent);
        int centerX = insets.left + containerWidth / 2;
        int centerY = insets.top + containerHeight / 2;

        int comCount = parent.getComponentCount();
        for (int i = 0; i < comCount; i++) {
            Component c = parent.getComponent(i);
            if (c.isVisible()) {
                Dimension size = c.getPreferredSize();
                double angle = 2 * Math.PI * i / comCount;
                int x = centerX + (int) (Math.cos(angle) * xradius);
                int y = centerY + (int) (Math.sin(angle) * yradius);

                c.setBounds(x - size.width / 2, y - size.height / 2, size.width, size.height);
            }
        }
    }
}