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package com.github.dabasan.joglf.gl.tool;

/**
 * Provides functions to handle coordinate systems.
 * 
 * @author Daba
 *
 */
public class CoordinateFunctions {
	/**
	 * Returns a normalized value ranged between -1.0 and 1.0.
	 * 
	 * @param value
	 *            Value
	 * @param max
	 *            Maximum
	 * @return Normalized value
	 */
	public static float NormalizeCoordinate(int value, int max) {
		return 2.0f * value / max - 1.0f;
	}
	/**
	 * Returns a normalized value ranged between -1.0 and 1.0.
	 * 
	 * @param value
	 *            Value
	 * @param max
	 *            Maximum
	 * @return Normalized value
	 */
	public static float NormalizeCoordinate(float value, int max) {
		return 2.0f * value / max - 1.0f;
	}

	/**
	 * Converts a normalized value to an expanded value.
	 * 
	 * @param value
	 *            Normalized value
	 * @param max
	 *            Maximum
	 * @return Expanded value
	 */
	public static int ExpandNormalizedCoordinate(float value, int max) {
		return (int) Math.round(max * (value + 1.0) * 0.5f);
	}

	/**
	 * Mutual conversion between a window y-coordinate and an OpenGL
	 * y-coordinate.
	 * 
	 * @param y
	 *            Window y-coordinate
	 * @param height
	 *            Window height
	 * @return OpenGL y-coordinate
	 */
	public static int ConvertWindowCoordinateAndOpenGLCoordinate_Y(int y, int height) {
		return height - y;
	}
}