/*
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 *
 * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
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package net.java.games.input;

import java.io.IOException;

/** Represents a linux button
* @author elias
* @version 1.0
*/
final class LinuxPOV extends LinuxComponent {
	private final LinuxEventComponent component_x;
	private final LinuxEventComponent component_y;

	private float last_x;
	private float last_y;
	
	public LinuxPOV(LinuxEventComponent component_x, LinuxEventComponent component_y) {
		super(component_x);
		this.component_x = component_x;
		this.component_y = component_y;
	}

	protected final float poll() throws IOException {
		last_x = LinuxControllers.poll(component_x);
		last_y = LinuxControllers.poll(component_y);
		return convertValue(0f, null);
	}

	public float convertValue(float value, LinuxAxisDescriptor descriptor) {
		if (descriptor == component_x.getDescriptor())
			last_x = value;
		if (descriptor == component_y.getDescriptor())
			last_y = value;

		if (last_x == -1 && last_y == -1)
			return Component.POV.UP_LEFT;
		else if (last_x == -1 && last_y == 0)
			return Component.POV.LEFT;
		else if (last_x == -1 && last_y == 1)
			return Component.POV.DOWN_LEFT;
		else if (last_x == 0 && last_y == -1)
			return Component.POV.UP;
		else if (last_x == 0 && last_y == 0)
			return Component.POV.OFF;
		else if (last_x == 0 && last_y == 1)
			return Component.POV.DOWN;
		else if (last_x == 1 && last_y == -1)
			return Component.POV.UP_RIGHT;
		else if (last_x == 1 && last_y == 0)
			return Component.POV.RIGHT;
		else if (last_x == 1 && last_y == 1)
			return Component.POV.DOWN_RIGHT;
		else {
			ControllerEnvironment.logln("Unknown values x = " + last_x + " | y = " + last_y);
			return Component.POV.OFF;
		}
	}
}