// CopyCat
//
// Energy percentage bar.
//
// Author  Matthew Caryl
// Created 17.4.96

package CopyCat;

import java.awt.*;

final class EnergyBar {
	private float energy;
	private int width;
	private int height;
	private Color background_color;
	private Color foreground_color;
	private Image image;
	private Graphics graphics;
	boolean dirty;
	
	public EnergyBar(int W, int H, Color B, Color F, Component C) {
		energy = 0f;
		width = W;
		height = H;
		background_color = B;
		foreground_color = F;
		image = C.createImage(W, H);
		graphics = image.getGraphics();
		graphics.setColor(background_color);
		graphics.fillRect(0, 0, W, H);
		dirty = true;
		}
	
	protected void finalize() throws Throwable {
		if (graphics != null)
			graphics.dispose();
		super.finalize();
		}
	
	public float getEnergy() {
		return energy;
		}
	
	public void setEnergy(float E) {
		int old_bar = (int) (width * energy);
		int new_bar = (int) (width * E);
		energy = E;
		if (old_bar < new_bar) {
			graphics.setColor(foreground_color);
			graphics.fillRect(old_bar + 1, 0, new_bar - old_bar, height);
			dirty = true;
			}
		else if (old_bar > new_bar) {
			graphics.setColor(background_color);
			graphics.fillRect(new_bar + 1, 0, old_bar - new_bar, height);
			dirty = true;
			}
		}
	
	public void paint(Graphics g, int X, int Y) {
		g.drawImage(image, X, Y, null);
		dirty = false;
		}
	
	public boolean dirty() {
		return dirty;
		}
	}