Continuation of 53c79c5 - HitObject name changes.

Attempts to eliminate any confusion between OsuHitObject (raw, parsed hit objects) and HitObject (interface for game object types).
- Renamed "HitObject" interface to "GameObject", since these objects are specific to gameplay.
- Renamed "OsuHitObject" to "HitObject", since these objects are primarily containers for parsed data.

Sorry if the name-swapping is confusing; these should be better names in the long run.

Signed-off-by: Jeffrey Han <itdelatrisu@gmail.com>

src/itdelatrisu/opsu/objects/GameObject.java

@@ -0,0 +1,72 @@
+/*
+ * opsu! - an open-source osu! client
+ * Copyright (C) 2014, 2015 Jeffrey Han
+ *
+ * opsu! is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * opsu! is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with opsu!.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package itdelatrisu.opsu.objects;
+
+import org.newdawn.slick.Graphics;
+
+/**
+ * Interface for hit object types used during gameplay.
+ */
+public interface GameObject {
+	/**
+	 * Draws the hit object to the graphics context.
+	 * @param g the graphics context
+	 * @param trackPosition the current track position
+	 */
+	public void draw(Graphics g, int trackPosition);
+
+	/**
+	 * Updates the hit object.
+	 * @param overlap true if the next object's start time has already passed
+	 * @param delta the delta interval since the last call
+	 * @param mouseX the x coordinate of the mouse
+	 * @param mouseY the y coordinate of the mouse
+	 * @param keyPressed whether or not a game key is currently pressed
+	 * @param trackPosition the track position
+	 * @return true if object ended
+	 */
+	public boolean update(boolean overlap, int delta, int mouseX, int mouseY, boolean keyPressed, int trackPosition);
+
+	/**
+	 * Processes a mouse click.
+	 * @param x the x coordinate of the mouse
+	 * @param y the y coordinate of the mouse
+	 * @param trackPosition the track position
+	 * @return true if a hit result was processed
+	 */
+	public boolean mousePressed(int x, int y, int trackPosition);
+
+	/**
+	 * Returns the coordinates of the hit object at a given track position.
+	 * @param trackPosition the track position
+	 * @return the [x,y] coordinates
+	 */
+	public float[] getPointAt(int trackPosition);
+
+	/**
+	 * Returns the end time of the hit object.
+	 * @return the end time, in milliseconds
+	 */
+	public int getEndTime();
+
+	/**
+	 * Updates the position of the hit object.
+	 */
+	public void updatePosition();
+}