Добавлена панель для вывода графики

src/tse/lr5/PaintPanel.java

@@ -0,0 +1,37 @@
+package tse.lr5;
+
+import java.awt.Color;
+import java.awt.Dimension;
+import java.awt.Graphics;
+import java.util.ArrayList;
+import java.util.List;
+import javax.swing.JPanel;
+
+/**
+ * Панель рисования.
+ * @author aNNiMON
+ */
+public class PaintPanel extends JPanel {
+    
+    private final List<PaintableObject> paintables;
+    
+    public PaintPanel(int width, int height) {
+        paintables = new ArrayList<>();
+        
+        setBackground(Color.WHITE);
+        setPreferredSize(new Dimension(width, height));
+    }
+    
+    public synchronized void addPaintable(PaintableObject obj) {
+        paintables.add(obj);
+        invalidate();
+    }
+
+    @Override
+    protected void paintComponent(Graphics g) {
+        super.paintComponent(g);
+        for (PaintableObject paintable : paintables) {
+            paintable.draw(g);
+        }
+    }
+}