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distanceInYards, and yardPercent variables initial values of 0
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function initializeGame():Void { pixelsTraveled = 0; distanceInYards = 0; yardPercent = 0; speed = 0; enableAll(true, true); runner_mcgotoAndStop(1); end_mc_visible = false; }
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9 Locate the moveGraphics function 10 At the top of the moveGraphics function, you ll update the pixelsTraveled
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variable along with updating the graphics on the screen Specifically, pixelsTraveled will grow at the same rate the road moves (speed * 5) That way, you can be sure that the number of pixelsTraveled is accurate, because the runner moves at the same rate as the ground
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function moveGraphics():Void { pixelsTraveled += speed * 5; scrollMc(bg_mcroad1_mc,bg_mcroad2_mc,speed * 5); scrollMc(bg_mctrees1_mc,bg_mctrees2_mc,speed * 3); scrollMc(bg_mcmountains1_mc,bg_mcmountains2_mc,speed * 2); scrollMc(bg_mcclouds1_mc,bg_mcclouds2_mc,speed); }
11 Save the file, and keep it open for the next exercise
EXERCISE 8-6: Going the Distance!
Now that you have a yard system set up, take a look at running the complete distance and showing the progress at the bottom of the screen
1 Make sure you are working in the same file from the last exercise 2 In the Library, double-click the Movie Clip symbol icon for the mcDistance
movie clip
3 Inside the mcDistance movie clip (shown in Figure 8-2), notice there is a
100-frame animation Scrub the Playhead to preview the animation This will correspond to the percentage of yards the person playing the game has traveled, so you ll use this animation to show the progress of the runner
4 In the Timeline, click the Scene 1 button to return to the Main Timeline
C H A P T E R
FIGURE 8-2
Viewing the animation inside the mcDistance movie clip
5 On the bottom elements layer, select the dynamic text field at the bottom
of the Stage to note its instance name in the Property Inspector, distance_txt (see Figure 8-3) You ll use this text field to display the number of yards the player has traveled
6 Select the first keyframe of the actions layer and open the Actions panel 7 In the DEFINE EVENT HANDLERS section, locate the run event handler
function
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FIGURE 8-3
Viewing the distance_txt text field
8 At the bottom of the run function, execute a function called showDistance
The show distance function, which you ll define later in this exercise, will display the distance information at the bottom of the screen
function run():Void { setSpeed(); showSpeed(); moveGraphics(); showDistance(); }
9 At the bottom of the DEFINE FUNCTIONS section, create the skeleton of
a function called showDistance
C H A P T E R
function showDistance():Void { }
10 Inside the showDistance function, set the distanceInYards variable s value
to pixelsTraveled divided by pixelsPerYard This converts the pixel distance into yards (or at least fake yards in this game)
function showDistance():Void { distanceInYards = pixelsTraveled / pixelsPerYard; }
11 On the next line, set the value of yardPercent to Mathround(distanceInYards /
totalYards * 100) This will get the percentage of yards traveled (distanceInYards / totalYards), multiply it by 100, then round the number so it can represent a frame for the distance_mc movie clip to display
function showDistance():Void { distanceInYards = pixelsTraveled / pixelsPerYard; yardPercent = Mathround(distanceInYards / totalYards * 100); }
Remember that the value of totalYards is 30, as specified at the top of your code
12 On the next line, make the distance_mc movie clip go to the frame number
held in the yardPercent variable by using the gotoAndStop method and passing in yardPercent
function showDistance():Void { distanceInYards = pixelsTraveled / pixelsPerYard; yardPercent = Mathround(distanceInYards / totalYards * 100); distance_mcgotoAndStop(yardPercent); }
Notice yardPercent is not in quotes, unlike run when you used gotoAndStop to navigate to a frame label to make the runner run This is because yardPercent is actually a Number If the value yardPercent were placed in quotes, Flash would look for a frame label called yardPercent instead of going to the frame number held in the yardPercent variable
Detecting Acceleration: A Running Game
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GUIDE
13 Test the movie, and run Watch the distance_mc movie clip on the bottom
right update as you run, as shown here Sweet!
If your movie isn t working properly, chances are the problem is a simple typo Review the code you wrote for this exercise, comparing it to the code in the book, to fix any errors
14 Now, you ll make the text field (distance_txt) on the Stage display how
many yards you have traveled On the next line, set the value of the text field to Mathfloor(distanceInYards) + yds This will take the distanceInYards variable and make it a whole number, using Mathfloor() (Mathfloor() rounds numbers down to the floor), and adds on a space and yds, to indicate the number is in yards
function showDistance():Void { distanceInYards = pixelsTraveled / pixelsPerYard; yardPercent = Mathround(distanceInYards / totalYards * 100); distance_mcgotoAndStop(yardPercent); distance_txttext = Mathfloor(distanceInYards) + " yds"; }
15 Test the movie, and run again Watch the text at the bottom of the screen
update as you run, as shown here Nice!
C H A P T E R
16 Save the file, and keep it open for the next exercise
EXERCISE 8-7: Ending the Game
In this exercise, I ll show you how to end the game once the player has ran for the full distance You ll also display the player s ending time
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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