ECE 462 Object-Oriented Programming using C++ and Java. Key Inputs in Java Games

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1 ECE 462 Object-Oriented Programming g using C++ and Java Key Inputs in Java Games Yung-Hsiang Lu yunglu@purdue.edu d YHL Java Key Input 1

2 Handle Key Events have the focus of the keyboard inputs by calling setfocusable(true) two types of events: pressing and releasing what key (Unicode) is pressed (such as 'A' or '<') implement three functions keypressed(keyevent e) keyreleased(keyevent e) keytyped(keyevent e) YHL Java Key Input 2

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14 Handle Key Events in a Full Screen Game YHL Java Key Input 14

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20 must be overridden by derived classes YHL Java Key Input 20

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24 ECE 462 Object-Oriented Programming g using C++ and Java Mouse Inputs in Java Games Yung-Hsiang Lu yunglu@purdue.edu d YHL Java Mouse Input 1

25 Java Mouse Listeners MouseListener: handle clicks mouseclicked(mouseevent e) mouseentered(mouseevent e) mouseexited(mouseevent e) mousepressed(mouseevent e) mousereleased(mouseevent e) MouseMotionListener: handle motion mousedragged(mouseevent e) mousemoved(mouseevent e) YHL Java Mouse Input 2

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39 ECE 462 Object-Oriented Programming g using C++ and Java Multiple Inheritance in C++ Yung-Hsiang Lu yunglu@purdue.edu d YHL C++ Multiple Inheritance 1

40 Multiple Inheritance One of the most (if not the most) controversial features in C++. Not supported in Java. Java uses interfaces. Most C++ books do not explain the concept and the problems. Understand the advantages and the problems and you can decide whether to use it. YHL C++ Multiple Inheritance 2

41 Multiple Inheritance Student Teacher Car Truck TeachingAssistant SportUtilityVehicle Person Woman Employee FemaleEmployee YHL C++ Multiple Inheritance 3

42 Design Issues A class provides interface and implementation. Code reuse is good but a class, once declared, d is hard to change because of the code depending on this class. If you have any doubt, do not create a class. Avoid the proliferation of classes because they make code reuse harder. Person Woman Parent Employee Mother MomEmployee YHL C++ Multiple Inheritance 4

43 Too Many Classes In many ypayroll systems, a person's status (for example tax withholding) depends on the person's role. If a person has children, the person's tax withholding is less. If an employee is also a mother, a company may send a gift to the children on their birthdays. Should you create one class for each possible status of employee? Or, use attributes to distinguish their status? YHL C++ Multiple Inheritance 5

44 What Does a Class Give You? interface (public inheritance) and implementation polymorphism object creation If you are not using polymorphism, think twice (or more) before creating a class. It is usually easier to change the behavior of an attribute (encapsulation) than changing g the interface (code reuse). YHL C++ Multiple Inheritance 6

45 Repeated Inheritance class Vehicle { Vehicle int v_enginesize; int v_numberwheel; }; Car Truck Does SportUtilityVehicle have one v_enginesize or two? two, unless you use virtual inheritance ambiguous, compilation error SportUtilityVehicle YHL C++ Multiple Inheritance 7

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48 Virtual Inheritance YHL C++ Multiple Inheritance 10

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51 Virtual Inheritance and Copy Constructor YHL C++ Multiple Inheritance 13

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57 Virtual Inheritance and Assignment Operator YHL C++ Multiple Inheritance 19

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64 ECE 462 Object-Oriented Programming g using C++ and Java Qt Layout Yung-Hsiang Lu yunglu@purdue.edu d YHL Qt Layout 1

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72 Menubar and Vertical Layout YHL Qt Layout 9

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78 Horizontal Layout YHL Qt Layout 15

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81 Grid Layout YHL Qt Layout 18

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86 Combination of Layouts YHL Qt Layout 23

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