SSD04 Exercise04 个人解答

Programming and Heuristic Evaluation

This exercise has two parts:

  • A programming part , in which you will create a Visual Basic form that responds to the user's actions rather than merely displaying information
  • A Heuristic Evaluation part , in which you will use the heuristics you have learned so far to evaluate the Windows Sound control panel

When you submit the exercise, you should submit all files for both parts. This doesn't mean that you should start both parts at the same time. In fact, it would be to your advantage to start the programming part immediately after you have assimilated the programming material in 2.2.1 Buttons , and to not start with the Heuristic Evaluation part until you have finished 2.2.4 HE: Flexibility and Efficiency of Use .


Part A: Programming — Adding Interactivity

Description

This assignment is to create a small Visual Basic interface using buttons and labels.  This interface will allow three integer values to be incremented and decremented using buttons as shown below. Two buttons should be placed next to each integer display, one to increment the value, and one to decrement the value.   The first integer value should be kept within the range 0 to 23.  The remaining integers should be kept within the range 0 to 59.  "OK", "Cancel", and "Apply" buttons should also be provided.  Pressing either the "OK" or "Cancel" buttons should simply close the interface.  (Closing the interface can be accomplished by the code: "unload <formName> " where "<formName> " is replaced by the name of your form).  In this case, pressing the "Apply" button should do nothing.  (Note that in general, pressing the "Apply" button performs the same actions as the "OK" button except that it does not close the window.  In this special case, since the "OK" button does not actually perform any actions except closing the window, the correct action for the "Apply" button is to do nothing.)  Be sure to make the "OK" button be the default button and initial focus for the interface, to make "Cancel" the cancel button, and to implement the shortcut key shown for "Apply".


Be sure to use accessor (get /set ) methods for the three integer values that form the model for this interface.

Hint: the easiest way to enforce restrictions on values is to place enforcement code in the write accessor (set method) for the value. For more about accessor methods, see the section "Encapsulation and Accessor Patterns" in 1.1.2 Basic Concepts of Interactive Programming .

When you are done with both parts of this exercise, submit your solutions by following the link at the bottom of this page.

Resources

  • An executable like the application you are asked to create, click Ex4.exe . (From Internet Explorer, select the "Run this program" option of the "File download" dialog box that appears—from Netscape, save and double-click the file Ex4.exe.)

Part B: Heuristic Evaluation — The Sound Control Panel

Description

 



 
The Windows Sound Control Panel

This is a picture of the Sound Control Panel on Windows machines. Become familiar with this control panel in your computer; experiment with it by clicking here and there. In this exercise, we ask you to evaluate this control panel according to the heuristics you have learned so far. Any aspect of the control panel is fair game for using in this exercise (any dialog box you can get it to bring up, any message it displays, etc.)

Using the five heuristics we have learned so far in this course, do a heuristic evaluation of this control panel. Write up five UARs in the format described in 1.3.3 How to Write a Usability Aspect Report (UAR) . At least two of the five UARs should be for usability problems (aspects of the interface that violate one or more of the five heuristics) and at least two should be for good features (aspects of the interface that follow one or more of the five heuristics).

The five heuristics we have learned so far are:

  • HE: Match Between the System and the Real World
  • HE: Visibility of System Status
  • HE: Consistency and Standards
  • HE: User Control and Freedom
  • HE: Flexibility and Efficiency of Use

Make sure you give us enough context in the UARs to understand what aspect of the interface you are referring to. Including screen shots of the interface really helps us understand your UARs. To capture a screen shot for a UAR, click in the window you want a picture of, then ALT-PRINTSCREEN. This will put a picture of the window in the copy-buffer. Then paste this picture into your UAR using your word processor.

When you are done with both parts of this exercise, submit all your files by clicking on "Submit" below.


Submission

Submit the following files:

  • A project archive named Exercise4.zip
  • UAR_sound_control.doc
资源下载链接为: https://pan.quark.cn/s/d9ef5828b597 四路20秒声光显示计分抢答器Multisim14仿真源文件+设计文档资料摘要 数字抢答器由主体电路与扩展电路组成。优先编码电路、锁存器、译码电路将参赛队的输入信号在显示器上输出;用控制电路和主持人开关启动报警电路,以上两部分组成主体电路。通过定时电路和译码电路将秒脉冲产生的信号在显示器上输出实现计时功能,构成扩展电路。经过布线、焊接、调试等工作后数字抢答器成形。关键字:开关阵列电路;触发锁存电路;解锁电路;编码电路;显示电路 一、设计目的 本设计是利用已学过的数电知识,设计的4人抢答器。(1)重温自己已学过的数电知识;(2)掌握数字集成电路的设计方法和原理;(3)通过完成该设计任务掌握实际问题的逻辑分析,学会对实际问题进行逻辑状态分配、化简;(4)掌握数字电路各部分电路与总体电路的设计、调试、模拟仿真方法。 二、整体设计 (一)设计任务与要求: 抢答器同时供4名选手或4个代表队比赛,分别用4个按钮S0 ~ S3表示。 设置一个系统清除和抢答控制开关S,该开关由主持人控制。 抢答器具有锁存与显示功能。即选手按动按钮,锁存相应的编号,并在LED数码管上显示,同时扬声器发出报警声响提示。选手抢答实行优先锁存,优先抢答选手的编号一直保持到主持人将系统清除为止。 参赛选手在设定的时间内进行抢答,抢答有效,定时器停止工作,显示器上显示选手的编号和抢答的时间,并保持到主持人将系统清除为止。 如果定时时间已到,无人抢答,本次抢答无效。 (二)设计原理与参考电路 抢答器的组成框图如下图所示。它主要由开关阵列电路、触发锁存电路、解锁电路、编码电路和显示电路等几部分组成。
评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值