RedBlueBox.java Source code

Introduction

Here is the source code for RedBlueBox.java

Source

import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.Polygon;

import javax.swing.BorderFactory;
import javax.swing.JComponent;
import javax.swing.JFrame;

public class RedBlueBox extends JComponent {

    public void paintComponent(Graphics g) {
        Insets insets = getInsets();
        int endX = getWidth() - insets.right;
        int endY = getHeight() - insets.bottom;
        // get the top-left corner
        int x = insets.left;
        int y = insets.top;

        g.setColor(Color.RED);
        Polygon p = new Polygon();
        p.addPoint(x, y);
        p.addPoint(endX, y);
        p.addPoint(x, endY);
        g.fillPolygon(p);
        g.setColor(Color.BLUE);
        p.reset();
        p.addPoint(endX, y);
        p.addPoint(x, endY);
        p.addPoint(endX, endY);
        g.fillPolygon(p);
    }

    public static void main(String args[]) {
        JFrame frame = new JFrame();
        Container contentPane = frame.getContentPane();
        contentPane.setLayout(new GridLayout(0, 1));
        JComponent comp = new RedBlueBox();
        comp.setBorder(BorderFactory.createMatteBorder(5, 5, 5, 5, Color.PINK));
        contentPane.add(comp);
        comp = new RedBlueBox();
        contentPane.add(comp);
        frame.setSize(300, 200);
        frame.show();
    }

}