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Adding Circular Motion Detection: A Clock Game
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currentButtonNum = thisnum; if(lastButtonNum == undefined) { lastButtonNum = thisnum; } cw1 = currentButtonNum == 0 && lastButtonNum == 3; cw2 = currentButtonNum == lastButtonNum + 1; ccw1 = currentButtonNum == 3 && lastButtonNum == 0; ccw2 = currentButtonNum == lastButtonNum - 1; if(cw1 || cw2) { updateClock(clock_mc, rotateAmt); } else if(ccw1 || ccw2) { updateClock(clock_mc, -rotateAmt); } lastButtonNum = thisnum; }
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You may be wondering why I set the currentButtonNum equal to thisnum at the beginning of this function and set lastButtonNum equal to thisnum at the end of this function This can potentially be confusing Basically, you use the currentButtonNum variable to capture the index number of the button being rolled over, and use that information throughout the function to rotate the clock Once the information is captured and used, you place the index number of the button rolled over in the lastButtonNum variable In this way, you capture the information about the last button that was rolled over (which, until you roll over another button, is the same as the current button) and store it until you roll over another button, so when you roll over the next button you have the information about the last button
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16 At the bottom of the DEFINE FUNCTIONS section, create the skeleton of
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a function called updateClock, which receives two parameters: one called clock with a MovieClip data type, and another called updateValue with a Number data type I ll discuss the updateValue parameter later in this exercise
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function updateClock(clock:MovieClip, updateValue:Number):Void
C H A P T E R
17 Inside the updateClock function, add the updateValue to the _rotation
value of the minute_mc movie clip inside the clock movie clip This will rotate the clock s minute hand clockwise if the value of the updateValue parameter is positive, and counterclockwise if the value is negative
function updateClock(clock:MovieClip, updateValue:Number):Void { clockminute_mc_rotation += updateValue; }
You may be wondering why I use the name clock, as opposed to clock_mc, to represent the clock Because you re going to be using this same function to rotate two clocks (the large clock and the small clock), you re using a generic name, clock, that can represent either one If you used clock_mc instead, you would only be able to rotate the larger clock
18 On the next line, add the updateValue divided by 12 to the _rotation
property of the hour hand (hour_mc) inside the clock movie clip This will rotate the hour hand by 1/12 the rate that the minute hand rotates, which will make the clock on the screen move like a real clock In other words, each time the minute hand makes a full rotation (12 five-minute steps), the hour hand takes a single one-hour step
function updateClock(clock:MovieClip, updateValue:Number):Void { clockminute_mc_rotation += updateValue; clockhour_mc_rotation += updateValue / 12; }
19 Test the movie (see Figure 7-3), and move the mouse in a clockwise circle
to watch the clock hands rotate clockwise Then, move the mouse in a counterclockwise circle to watch the clock hands move counterclockwise Awesome!
Adding Circular Motion Detection: A Clock Game
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FIGURE 7-3
The clock hands move just the way they re supposed to
Sometimes, you will have errors in your code that will show messages in the Output window that tell you exactly where the problem is Other times, the error messages will be difficult to understand, or the movie will not work as it should and you won t see any error messages at all If that s the case when you test the movie, go back through this exercise and compare your code to the code in the book, paying the most attention to the smallest details (typos including capitalization, parentheses, square brackets, curly braces, semicolons, colons, etc)
20 Save the file, and keep it open for the next exercise
C H A P T E R
EXERCISE 7-4: Creating a Target Time
In this exercise, you ll add the interactivity to the target_txt text field and the target_mc movie clip so that both display the time the player needs to set the clock_mc movie clip
1 Make sure you are working in the same file from the last exercise 2 Select the first keyframe of the actions layer and open the Actions panel by
pressing F9 (Windows) or OPTION-F9 (Mac)
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