package com.synthdreams.GalacticBlast;

import net.rim.device.api.system.Bitmap;
import net.rim.device.api.system.Display;
import net.rim.device.api.ui.*;
import java.util.Vector;

// The GFX class is our game's graphics engine with all the drawing routines
class GFX 
{
    int _backPos, _backSpeed; // Background position and speed
    Bitmap _backgroundBM; // The bitmap for the background
    Bitmap _healthBM; // The bitmap for the health meter
    Font _gameFont; // The font used for drawing score and lives
    
    GFX() 
    {
        // First see if we can get the BBCondensed font at size 16 for our game font.
        // If not, we just go with the default, but all Blackberrys should have this font.
        try
        {
            _gameFont = FontFamily.forName("BBCondensed").getFont(FontFamily.SCALABLE_FONT,16);
        }
        catch (Exception e) { }
        
        // Load the health bitmap from health.png
        _healthBM = Bitmap.getBitmapResource("health.png");
    }
    
    // Get current background position
    public int getBackPos() { return _backPos; }
    
    // Method that sets the bitmap for the background and sets the scroll speed
    public void initBackground(String passBackground, int passSpeed)
    {
       _backgroundBM = Bitmap.getBitmapResource(passBackground);
       _backPos = 0;
       _backSpeed = passSpeed;
    }
    
    // Primary function for the graphics engine, draws all the objects, text, health, etc
    public void process(Graphics passGraphics, Vector passObjects, int passScore, int passLives)
    {
        // Draw our background at the correct position
        passGraphics.drawBitmap(0,0, Graphics.getScreenWidth(), Graphics.getScreenHeight(), _backgroundBM, 0, _backPos);
        
        // Move our background.  
        _backPos -= _backSpeed;
        
        //If we're at the beginning of our bitmap, reset to end
        if (_backPos < 0)
        {
           _backPos = _backgroundBM.getHeight() - _backSpeed;
        }
        
        // If we're within screenheight of the end of our bitmap, we need to draw another copy to fill in the blank
        if (_backgroundBM.getHeight() - _backPos < Graphics.getScreenHeight()+_backSpeed)
        {
           passGraphics.drawBitmap(0, _backgroundBM.getHeight() - _backPos - _backSpeed, Graphics.getScreenWidth(), Graphics.getScreenHeight(), _backgroundBM, 0, 0);
        }
        
        // Now draw each of our objects to the screen
        for (int lcv = 0 ; lcv < passObjects.size() ; lcv++)
        {
            passGraphics.drawBitmap(((OBJ) passObjects.elementAt(lcv)).getX(),
                                    ((OBJ) passObjects.elementAt(lcv)).getY(),
                                    ((OBJ) passObjects.elementAt(lcv)).getBitmap().getWidth(),
                                    ((OBJ) passObjects.elementAt(lcv)).getBitmap().getHeight(),
                                    ((OBJ) passObjects.elementAt(lcv)).getBitmap(),
                                    0, 0);
        }
        
        // Draw score
        String zeroPad;
        
        // We want to pad the score with 0s
        zeroPad = "";
        if (passScore < 10000)
          zeroPad += "0";        
        if (passScore < 1000)
          zeroPad += "0";
        if (passScore < 100)
          zeroPad += "0";
        if (passScore < 10)
          zeroPad += "0";
          
        // Draw score and lives in white with the game font
        passGraphics.setColor(0xFFFFFF);
        passGraphics.setFont(_gameFont);
        passGraphics.drawText("Score: " + zeroPad + passScore, Graphics.getScreenWidth()-93, 2);
        passGraphics.drawText("Lives: " + passLives, 7, Graphics.getScreenHeight() - 20);
        
        //Draw health, with width dependent on hero's life
        if (((OBJ) passObjects.elementAt(0)).getLife() > 0)
            passGraphics.drawBitmap(7, 7, _healthBM.getWidth() * ((OBJ) passObjects.elementAt(0)).getLife() / 5, _healthBM.getHeight(), _healthBM, 0, 0);
    }

}