Minor updates.

- Draw the playfield background in the song menu if a background cannot be drawn for the focused beatmap.
- Added ScoreDB.deleteScore() method to delete a score from the database.
- Added @author tags for curve-related classes (by fluddokt, #12).

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

src/itdelatrisu/opsu/ScoreDB.java

@@ -44,6 +44,9 @@ public class ScoreDB {
 	/** Score select statement. */
 	private static PreparedStatement selectMapStmt, selectMapSetStmt;
 
+	/** Score deletion statement. */
+	private static PreparedStatement deleteStmt;
+
 	// This class should not be instantiated.
 	private ScoreDB() {}
 
@@ -82,6 +85,10 @@ public class ScoreDB {
 				"SELECT * FROM scores WHERE " +
 				"MSID = ? AND title = ? AND artist = ? AND creator = ? ORDER BY version DESC"
 			);
+			deleteStmt = connection.prepareStatement(
+				"DELETE FROM scores WHERE " +
+				"MID = ? AND title = ? AND artist = ? AND creator = ? AND version = ?"
+			);
 		} catch (SQLException e) {
 			ErrorHandler.error("Failed to prepare score insertion statement.", e, true);
 		}
@@ -139,6 +146,23 @@ public class ScoreDB {
 		}
 	}
 
+	/**
+	 * Deletes all the scores for the given beatmap from the database.
+	 * @param osu the OsuFile object
+	 */
+	public static void deleteScore(OsuFile osu) {
+		try {
+			deleteStmt.setInt(1, osu.beatmapID);
+			deleteStmt.setString(2, osu.title);
+			deleteStmt.setString(3, osu.artist);
+			deleteStmt.setString(4, osu.creator);
+			deleteStmt.setString(5, osu.version);
+			deleteStmt.executeUpdate();
+		} catch (SQLException e) {
+			ErrorHandler.error("Failed to delete score from database.", e, true);
+		}
+	}
+
 	/**
 	 * Retrieves the game scores for an OsuFile map.
 	 * @param osu the OsuFile

src/itdelatrisu/opsu/objects/curves/Bezier2.java

@@ -20,6 +20,8 @@ package itdelatrisu.opsu.objects.curves;
 
 /**
  * Representation of a Bezier curve with the distance between each point calculated.
+ *
+ * @author fluddokt (https://github.com/fluddokt)
  */
 public class Bezier2 {
 	/** The control points of the Bezier curve. */

src/itdelatrisu/opsu/objects/curves/CircumscribedCircle.java

@@ -29,6 +29,8 @@ import org.newdawn.slick.Image;
 /**
  * Representation of a curve along a Circumscribed Circle of three points.
  * http://en.wikipedia.org/wiki/Circumscribed_circle
+ *
+ * @author fluddokt (https://github.com/fluddokt)
  */
 public class CircumscribedCircle extends Curve {
 	/** PI constants. */

src/itdelatrisu/opsu/objects/curves/Curve.java

@@ -24,6 +24,8 @@ import org.newdawn.slick.Color;
 
 /**
  * Representation of a curve.
+ *
+ * @author fluddokt (https://github.com/fluddokt)
  */
 public abstract class Curve {
 	/** The associated OsuHitObject. */

src/itdelatrisu/opsu/objects/curves/LinearBezier.java

@@ -31,6 +31,8 @@ import org.newdawn.slick.Image;
 /**
  * Representation of a Bezier curve with equidistant points.
  * http://pomax.github.io/bezierinfo/#tracing
+ *
+ * @author fluddokt (https://github.com/fluddokt)
  */
 public class LinearBezier extends Curve {
 	/** The angles of the first and last control points for drawing. */

src/itdelatrisu/opsu/objects/curves/Vec2f.java

@@ -20,6 +20,8 @@ package itdelatrisu.opsu.objects.curves;
 
 /**
  * A two-dimensional floating-point vector.
+ *
+ * @author fluddokt (https://github.com/fluddokt)
  */
 public class Vec2f {
 	/** Vector coordinates. */

src/itdelatrisu/opsu/states/Game.java

@@ -177,6 +177,7 @@ public class Game extends BasicGameState {
 			Image playfield = GameImage.PLAYFIELD.getImage();
 			playfield.setAlpha(dimLevel);
 			playfield.draw();
+			playfield.setAlpha(1f);
 		}
 
 		int trackPosition = MusicController.getPosition();

src/itdelatrisu/opsu/states/SongMenu.java

@@ -238,8 +238,11 @@ public class SongMenu extends BasicGameState {
 		int mouseX = input.getMouseX(), mouseY = input.getMouseY();
 
 		// background
-		if (focusNode != null)
-			focusNode.osuFiles.get(focusNode.osuFileIndex).drawBG(width, height, 1.0f, true);
+		if (focusNode != null) {
+			OsuFile focusNodeOsu = focusNode.osuFiles.get(focusNode.osuFileIndex);
+			if (!focusNodeOsu.drawBG(width, height, 1.0f, true))
+				GameImage.PLAYFIELD.getImage().draw();
+		}
 
 		// header setup
 		float lowerBound = height * 0.15f;