Ebene für allgemeine zeichenbare Objekte

ggf. sollte der ShapesLayer auch ein DrawableLayer sein

src/schule/ngb/zm/DrawableLayer.java

@@ -0,0 +1,56 @@
+package schule.ngb.zm;
+
+import java.awt.*;
+import java.util.LinkedList;
+
+public class DrawableLayer extends Layer {
+
+	protected LinkedList<Drawable> drawables = new LinkedList<>();
+
+	protected boolean clearBeforeDraw = true;
+
+	public DrawableLayer() {
+	}
+
+	public DrawableLayer( int width, int height ) {
+		super(width, height);
+	}
+
+	public void add( Drawable... drawables ) {
+		synchronized( drawables ) {
+			for( Drawable d : drawables ) {
+				this.drawables.add(d);
+			}
+		}
+	}
+
+	public java.util.List<Drawable> getDrawables() {
+		return drawables;
+	}
+
+	public boolean isClearBeforeDraw() {
+		return clearBeforeDraw;
+	}
+
+	public void setClearBeforeDraw( boolean pClearBeforeDraw ) {
+		this.clearBeforeDraw = pClearBeforeDraw;
+	}
+
+	@Override
+	public void draw( Graphics2D pGraphics ) {
+		if( clearBeforeDraw ) {
+			clear();
+		}
+
+		synchronized( drawables ) {
+			for( Drawable d : drawables ) {
+				if( d.isVisible() ) {
+					d.draw(drawing);
+				}
+			}
+		}
+
+		super.draw(pGraphics);
+	}
+
+}