OffsetUtil.java

package com.lucasdnd.ags.map;

/**
 * Here, we FLOOR or CEIL the offset so we don't get annoying precision problems when converting positions to screen pixels.
 * 
 * Not using the methods in this class will cause images to be rendered a few pixels off of where it should be. This happens because the screen pixels
 * are measured in integer numbers, while all the offsets and scale are floating point numbers.
 * 
 * @author tulio
 *
 */
public abstract class OffsetUtil {

	/**
	 * Corrects the xOffset to prevent rounding errors
	 * @param xOffset
	 * @return
	 */
	public static float getPreciseOffset(float offset) {
		return (offset <= 0) ? (float)Math.ceil(offset) : (float)Math.floor(offset);
	}
}