import java.awt.*;
import java.awt.event.*;

/**
 * Create window and display TGA file image
 * @author Phil Gage
 */
public class Show extends Panel {
    Image img = null;  // Image pixmap for graphics
    static Frame f;
    static String filename;

    /**
     * Method paint redraws window each time window is exposed.
     * Could draw simple graphics directly in this method.
     * This version saves graphics in image for fast redraw.
     * @param g  graphics object
     */
    public void paint (Graphics g) {
        // Initialize image only once
        if (img == null) {
            img = loadImage ();
        }
        // Refresh image using current window size
        g.drawImage (img, 0, 0, getWidth(), getHeight(), this);
    }

    /**
     * Method loadImage reads TGA file into image.
     * This version saves graphics in image for fast redraw.
     */
    Image loadImage () {
        FrameBuffer fb = new FrameBuffer ();
        if (!fb.loadtga (filename)) {
            System.out.println ("Error reading file: " + filename);
            System.exit(0);
        }
        // Resize window to image size
        f.setSize (fb.width,fb.height);
        return fb.getImage (f);
    }

    /**
     * Main program for command line application.
     * Creates panel in frame and displays image.
     * @param argv  command line argument strings
     */
    public static void main (String[] argv) {

        System.out.println ("TGA file viewer by Phil Gage");
        System.out.println ("Master's Thesis, Univ of Colo, 2002");
        System.out.println ("Usage: java Show [filename]");
        System.out.println ("Default filename is frame0.tga");

        // Get TGA file name, use default if none
        if (argv.length == 0)
            filename = "frame0.tga";
        else
            filename = argv[0];

        // Create frame and app
        f = new Frame (filename);
        Show app = new Show ();

        // Add window close event handler
        f.addWindowListener (new WindowAdapter () {
           public void windowClosing (WindowEvent e) {
            System.exit (0);
           }
        });

        // Put panel in frame
        f.add ("Center", app);
        f.setSize (320,200);
        f.show ();
    }
}