Left: Implement composite structures

src/view/interfaces/IDialogChoice.java

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+package view.interfaces;
+
+public interface IDialogChoice<T> {
+    String getDialogTitle();
+
+    String getDialogText();
+
+    T[] getDialogOptions();
+
+    T getCurrentSelection();
+}

src/view/interfaces/IDrawShape.java

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+package view.interfaces;
+
+import java.awt.Color;
+import java.awt.Stroke;
+import java.util.EnumMap;
+
+import model.AbstractShape;
+import model.ShapeColor;
+
+/**
+ * IDrawShape interface
+ *
+ * Responsibility: Interface for the strategy pattern for drawing shapes.
+ *
+ * Note that if offset is true, an algorithm for drawing boundary is used instead.
+ *
+ * @author Minh Bui
+ *
+ */
+
+public interface IDrawShape {
+	int SELECT_STROKE_OFFSET = 5;
+	int SELECT_WIDTH_HEIGHT_OFFSET = 10;
+
+	void draw(AbstractShape shape, PaintCanvasBase canvas, EnumMap<ShapeColor, Color> colorMap, Stroke selectStroke,
+			  boolean offset);
+}

src/view/interfaces/IEventCallback.java

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+package view.interfaces;
+
+public interface IEventCallback {
+	void run();
+}

src/view/interfaces/IGuiWindow.java

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+package view.interfaces;
+
+import view.EventName;
+
+import javax.swing.*;
+
+public interface IGuiWindow {
+    JButton getButton(EventName eventName);
+}

src/view/interfaces/IUiModule.java

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+package view.interfaces;
+
+import view.EventName;
+
+public interface IUiModule {
+    void addEvent(EventName eventName, IEventCallback command);
+    <T> T getDialogResponse(IDialogChoice dialogChoice);
+}

src/view/interfaces/PaintCanvasBase.java

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+package view.interfaces;
+
+import javax.swing.*;
+import java.awt.*;
+
+public abstract class PaintCanvasBase extends JComponent {
+    public abstract Graphics2D getGraphics2D();
+}