jLabel Circle

  

 

Create class circle border

Example : CircleBorder.java

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.Polygon;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.geom.Area;
import java.awt.geom.Ellipse2D;
import javax.swing.border.AbstractBorder;

public class CircleBorder extends AbstractBorder{
    private final Color color;
    private BasicStroke stroke = null;
    private final RenderingHints hints;
    /** Constructor*/
    CircleBorder() {        
        color = Color.BLACK;
        stroke = new BasicStroke(1);
        hints = new RenderingHints(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
    }
    CircleBorder( Color color, int value) {        
        this.color = color;
        stroke = new BasicStroke(value);     
        hints = new RenderingHints(
                RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);
    }        

    @Override
    public void paintBorder(Component c,Graphics g,int x, int y, int width, int height) {

        Graphics2D g2 = (Graphics2D) g;
        Ellipse2D circle2D = new Ellipse2D.Double();//java2d

        if( stroke.getLineWidth()==0 )
        {
            circle2D.setFrameFromCenter( 
                    new Point(x+width/2,y+height/2), //rata tengah 
                    new Point( width , height) //lebar dan tinggi
                    );            
        }
        else
        {
            circle2D.setFrameFromCenter( 
                    new Point(x+width/2,y+height/2), 
                    new Point( width-(int)stroke.getLineWidth() , height-(int) stroke.getLineWidth())
                    );            
        }                
        Polygon pointer = new Polygon();
        Area area = new Area(circle2D);        
        area.add(new Area(pointer));
        g2.setRenderingHints(hints);

        //set warna background berdasarkan latar belakang parent
        Component parent  = c.getParent();
        if (parent!=null) {
            Color bg = parent.getBackground();
            Rectangle rect = new Rectangle(0,0,width, height);
            Area borderRegion = new Area(rect);
            borderRegion.subtract(area);
            g2.setClip(borderRegion);
            g2.setColor(bg);
            g2.fillRect(0, 0, width, height);
            g2.setClip(null);
        }                 
        if( stroke.getLineWidth()>0 )
        {
            g2.setColor(color);
            g2.setStroke(stroke);            
        }        
        g2.draw(area);
    }
}

Create class circle jLabel with circle border

Example : CLabel.java

import java.awt.Color;
import java.awt.Dimension;
import javax.swing.JLabel;
import static javax.swing.SwingConstants.CENTER;
import javax.swing.border.AbstractBorder;
public class CLabel extends JLabel {
    private AbstractBorder circleBorder = new CircleBorder();
    private int lineBorder = 1;
    private Color lineColor = Color.BLACK;

    public CLabel() {
        Dimension d = new Dimension(100, 100);
        setSize(d);
        setPreferredSize(d);
        setText("CLabel");
        setOpaque(true);
        setHorizontalAlignment(CENTER);
        setVisible(true);
        setBorder(circleBorder);
    }
    //Warna Border
    public Color getLineColor() {
        return lineColor;
    }
    public void setLineColor(Color color) {
        circleBorder = new CircleBorder(color, lineBorder);
        lineColor = color;
        setBorder(circleBorder);
    }
    //Ukuran Border
    public int getLineBorder() {
        return lineBorder;
    }
    public void setLineBorder(int lineBorder) {
        circleBorder = new CircleBorder(lineColor, lineBorder);
        this.lineBorder = lineBorder;
        setBorder(circleBorder);
    }
}

Clean and Build

Right click java project, select clean and build

How to Use

• Create Jframe 
• Drag and drop CLabel.java into jframe 

Properties Option

Change Border color, border Size