/*
 * [Gotcha.java]
 *
 * Summary: demonstrates pixel coordinate gotcha.
 *
 * Copyright: (c) 2005-2017 Roedy Green, Canadian Mind Products, http://mindprod.com
 *
 * Licence: This software may be copied and used freely for any purpose but military.
 *          http://mindprod.com/contact/nonmil.html
 *
 * Requires: JDK 1.8+
 *
 * Created with: JetBrains IntelliJ IDEA IDE http://www.jetbrains.com/idea/
 *
 * Version History:
 *  1.0 2005-08-01 initial version
 */
package com.mindprod.pointsize;

import com.mindprod.common18.VersionCheck;

import java.applet.Applet;
import java.awt.Color;
import java.awt.Graphics;

/**
 * demonstrates pixel coordinate gotcha.
 * <p/>
 * Simple Applet to display coordinate problem. Run with width=&quot;100&quot; height=&quot;100&quot;
 *
 * @author Roedy Green, Canadian Mind Products
 * @version 1.0 2005-08-01 initial version
 * @since 2005-08-01
 */
public final class Gotcha extends Applet
    {
    /**
     * Called by the browser or Applet viewer to inform
     * this Applet that it has been loaded into the system.
     */
    public void init()
        {
        if ( !VersionCheck.isJavaVersionOK( 1, 8, 0, this ) )
            {
            return;
            }
        // won't bleed through all the way to the browser background.
        this.setBackground( new Color( 0x00ffffff, true )/* transparent */ );
        validate();
        setVisible( true );
        }

    /**
     * {@inheritDoc}
     */
    public void paint( Graphics gr )
        {
        gr.setColor( Color.white );
        gr.fillRect( 0, 0, 200, 200 );
        // actual region
        gr.setColor( Color.pink );
        gr.fillRect( 40, 40, 100, 80 );
        // theoretical region
        gr.setColor( Color.red );
        gr.fillRect( 40, 40, 80, 60 );
        // make grid
        gr.setColor( Color.blue );
        for ( int i = 0; i < 200; i += 20 )
            {
            gr.fillRect( i, 0, 1, 200 );
            gr.fillRect( 0, i, 200, 1 );
            }
        // x axis number grid
        gr.setColor( Color.black );
        for ( int i = 0; i < 7; i++ )
            {
            // x,y is bottom left corner of text
            gr.drawString( Integer.toString( i ), 40 - 3 + i * 20, 40 - 5 );
            }
        // y axis number grid
        gr.setColor( Color.black );
        for ( int i = 0; i < 6; i++ )
            {
            gr.drawString( Integer.toString( i ), 40 - 10, 40 + 5 + i * 20 );
            }
        }
    }