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SquidLib platform-independent logic and utility code. Please refer to https://github.com/SquidPony/SquidLib .
There is a newer version: 3.0.6
package squidpony.panel;

import squidpony.IColorCenter;
import squidpony.annotation.Beta;

/**
 * The abstraction of {@code SquidPanel}s, to abstract from the UI
 * implementation (i.e. whether it's awt or libgdx doesn't matter here).
 * 
 * @author smelC - Introduction of this interface, but methods were in
 *         SquidPanel already.
 * 
 * @param 
 *            The type of colors
 * 
 * @see ICombinedPanel The combination of two panels, one for the background,
 *      one for the foreground; a frequent use case in roguelikes.
 */
@Beta
public interface ISquidPanel {

	/**
	 * Puts the character {@code c} at {@code (x, y)}.
	 * 
	 * @param x
	 * @param y
	 * @param c
	 */
	void put(int x, int y, char c);

	/**
	 * Puts {@code color} at {@code (x, y)} (in the cell's entirety, i.e. in the
	 * background).
	 * 
	 * @param x
	 * @param y
	 * @param color
	 */
	void put(int x, int y, T color);

	/**
	 * Puts the given string horizontally with the first character at the given
	 * offset.
	 *
	 * Does not word wrap. Characters that are not renderable (due to being at
	 * negative offsets or offsets greater than the grid size) will not be shown
	 * but will not cause any malfunctions.
	 *
	 * @param xOffset
	 *            the x coordinate of the first character
	 * @param yOffset
	 *            the y coordinate of the first character
	 * @param string
	 *            the characters to be displayed
	 * @param foreground
	 *            the color to draw the characters
	 */
	void put(int xOffset, int yOffset, String string, T foreground);

	/**
	 * Puts the given string horizontally with the first character at the given
	 * offset, using the colors that {@code cs} provides.
	 *
	 * Does not word wrap. Characters that are not renderable (due to being at
	 * negative offsets or offsets greater than the grid size) will not be shown
	 * but will not cause any malfunctions.
	 *
	 * @param xOffset
	 *            the x coordinate of the first character
	 * @param yOffset
	 *            the y coordinate of the first character
	 * @param cs
	 *            The string to display, with its colors.
	 */
	void put(int xOffset, int yOffset, IColoredString cs);

	/**
	 * Puts the character {@code c} at {@code (x, y)} with some {@code color}.
	 * 
	 * @param x
	 * @param y
	 * @param c
	 * @param color
	 */
	void put(int x, int y, char c, T color);

	/**
	 * @param foregrounds
	 *            Can be {@code null}, indicating that only colors must be put.
	 * @param colors
	 */
	void put(/* @Nullable */ char[][] foregrounds, T[][] colors);

	/**
	 * Removes the contents of this cell, leaving a transparent space.
	 *
	 * @param x
	 * @param y
	 */
	void clear(int x, int y);

	/**
	 * @return The number of cells that this panel spans, horizontally.
	 */
	int gridWidth();

	/**
	 * @return The number of cells that this panel spans, vertically.
	 */
	int gridHeight();

	/**
	 * @return The width of a cell, in number of pixels.
	 */
	int cellWidth();

	/**
	 * @return The height of a cell, in number of pixels.
	 */
	int cellHeight();

	/**
	 * @return Returns true if there are animations running when this method is
	 *         called.
	 */
	boolean hasActiveAnimations();

	/**
	 * Sets the default foreground color.
	 * 
	 * @param color
	 */
	void setDefaultForeground(T color);

	/**
	 * @return The default foreground color (if none was set with
	 *         {@link #setDefaultForeground(Object)}), or the last color set
	 *         with {@link #setDefaultForeground(Object)}. Cannot be
	 *         {@code null}.
	 */
	T getDefaultForegroundColor();

	/**
	 * Method to change the backing {@link IColorCenter}.
	 * 
	 * @param icc
	 * @return {@code this}
	 */
	ISquidPanel setColorCenter(IColorCenter icc);

	/**
	 * @return The panel doing the real job, i.e. an instance of
	 *         {@code SquidPanel}. The type of colors is unspecified, as some
	 *         clients have forwarding instances of this class that hides that
	 *         the type of color of the backer differs from the type of color in
	 *         {@code this}.
	 * 
	 *         
	 *         Can be {@code this} itself.
	 *         
	 */
	ISquidPanel getBacker();

}