MyCanvas.java Source code

Introduction

Here is the source code for MyCanvas.java

Source

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;

import javax.swing.ImageIcon;
import javax.swing.JComponent;
import javax.swing.JFrame;

public class MyCanvas extends JComponent {
    private static Color m_tRed = new Color(255, 0, 0, 150);

    private static Color m_tGreen = new Color(0, 255, 0, 150);

    private static Color m_tBlue = new Color(0, 0, 255, 150);

    private static Font monoFont = new Font("Monospaced", Font.BOLD | Font.ITALIC, 36);

    private static Font sanSerifFont = new Font("SanSerif", Font.PLAIN, 12);

    private static Font serifFont = new Font("Serif", Font.BOLD, 24);

    private static ImageIcon java2sLogo = new ImageIcon("java2s.gif");

    public void paintComponent(Graphics g) {
        super.paintComponent(g);

        // draw entire component white
        g.setColor(Color.white);
        g.fillRect(0, 0, getWidth(), getHeight());

        // yellow circle
        g.setColor(Color.yellow);
        g.fillOval(0, 0, 240, 240);

        // magenta circle
        g.setColor(Color.magenta);
        g.fillOval(160, 160, 240, 240);

        // paint the icon below blue sqaure
        int w = java2sLogo.getIconWidth();
        int h = java2sLogo.getIconHeight();
        java2sLogo.paintIcon(this, g, 280 - (w / 2), 120 - (h / 2));

        // paint the icon below red sqaure
        java2sLogo.paintIcon(this, g, 120 - (w / 2), 280 - (h / 2));

        // transparent red square
        g.setColor(m_tRed);
        g.fillRect(60, 220, 120, 120);

        // transparent green circle
        g.setColor(m_tGreen);
        g.fillOval(140, 140, 120, 120);

        // transparent blue square
        g.setColor(m_tBlue);
        g.fillRect(220, 60, 120, 120);

        g.setColor(Color.black);

        g.setFont(monoFont);
        FontMetrics fm = g.getFontMetrics();
        w = fm.stringWidth("Java Source");
        h = fm.getAscent();
        g.drawString("Java Source", 120 - (w / 2), 120 + (h / 4));

        g.setFont(sanSerifFont);
        fm = g.getFontMetrics();
        w = fm.stringWidth("and");
        h = fm.getAscent();
        g.drawString("and", 200 - (w / 2), 200 + (h / 4));

        g.setFont(serifFont);
        fm = g.getFontMetrics();
        w = fm.stringWidth("Support.");
        h = fm.getAscent();
        g.drawString("Support.", 280 - (w / 2), 280 + (h / 4));
    }

    public Dimension getPreferredSize() {
        return new Dimension(400, 400);
    }

    public Dimension getMinimumSize() {
        return getPreferredSize();
    }

    public static void main(String args[]) {
        JFrame mainFrame = new JFrame("Graphics demo");
        mainFrame.getContentPane().add(new MyCanvas());
        mainFrame.pack();
        mainFrame.setVisible(true);
    }
}