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/*
 * Copyright (c) 2001-2023 Mathew A. Nelson and Robocode contributors
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * https://robocode.sourceforge.io/license/epl-v10.html
 */
package net.sf.robocode.ui.gfx;


import java.awt.*;
import java.awt.geom.AffineTransform;


/**
 * The base of all renderable objects.
 * An {@code RenderObject} is an object that can be painted and transformed.
 *
 * @author Flemming N. Larsen (original)
 */
public class RenderObject {

	/**
	 * Base transform, e.g. the initial rotation and translation
	 */
	protected AffineTransform baseTransform;

	/**
	 * Current transform that is concatenated with the base transform
	 */
	protected final AffineTransform transform;

	/**
	 * Current frame that must be rendered
	 */
	protected int frame;

	/**
	 * Constructs a new {@code RenderObject}.
	 */
	public RenderObject() {
		baseTransform = new AffineTransform();
		transform = new AffineTransform();
	}

	/**
	 * Constructs a new {@code RenderObject} that is a copy of another {@code RenderObject}.
	 *
	 * @param renderObject the RenderObject to copy.
	 */
	public RenderObject(RenderObject renderObject) {
		baseTransform = new AffineTransform(renderObject.baseTransform);
		transform = new AffineTransform(renderObject.transform);
		frame = renderObject.frame;
	}

	/**
	 * Sets the base transform which is pre-concatenated with the current transform.
	 *
	 * @param Tx the new transform
	 */
	public void setBaseTransform(AffineTransform Tx) {
		baseTransform.setTransform(Tx);
	}

	/**
	 * Returns a copy of the base transform
	 *
	 * @return a copy of the base transform
	 */
	public AffineTransform getBaseTransform() {
		return new AffineTransform(baseTransform);
	}

	/**
	 * Sets the current transform, which is concatenated with the base transform.
	 *
	 * @param Tx the new transform
	 */
	public void setTransform(AffineTransform Tx) {
		transform.setTransform(Tx);
		transform.concatenate(baseTransform);
	}

	/**
	 * Returns a copy of the current transform
	 *
	 * @return a copy of the current transform
	 */
	public AffineTransform getTransform() {
		return transform;
	}

	/**
	 * Sets the current frame number
	 *
	 * @param frame the new frame number
	 */
	public void setFrame(int frame) {
		this.frame = frame;
	}

	/**
	 * Returns the current frame number
	 *
	 * @return the current frame number
	 */
	public int getFrame() {
		return frame;
	}

	/**
	 * Paint this object.
	 * This method must be overridden in derived classes.
	 *
	 * @param g the graphics context where this object must be painted.
	 */
	public void paint(Graphics2D g) {}

	/**
	 * Returns the bounds of this object based on it's current transform.
	 * This method must be overridden in derived classes.
	 *
	 * @return the bounds of this object based on it's current transform.
	 */
	public Rectangle getBounds() {
		return new Rectangle();
	}

	/**
	 * Returns a copy of this object.
	 * This method must be overridden in derived classes.
	 *
	 * @return a copy of this object.
	 */
	public RenderObject copy() {
		return new RenderObject(this);
	}
}