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EXERCISE 2-8: Writing Conditional Statements
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In this exercise, you ll get some practice writing conditional statements yourself
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1 Open Flash and create a new Flash file (ActionScript 20) 2 Change the name of Layer 1 to actions 3 Select the first keyframe of the actions layer and open the Actions panel 4 In the Actions panel, click in the Scripting pane and create a conditional
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statement that evaluates whether 3 is greater than 2 by typing the following code:
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if( 3 > 2) { trace("condition 1 is true"); }
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5 Test the movie Notice the message, shown in Figure 2-10, that comes up
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in the Output window
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FIGURE 2-10
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The trace statement appearing in the Output window
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ActionScript 20 Essentials
NINTENDO
FLASH
GAME
CREATOR S
GUIDE
6 Change the code in the if statement to read if 3 is less than 2, so the
condition will be false Your code should match this snippet:
if( 3 < 2) { trace("condition 1 is true"); }
7 Below the if statement, write an else statement Inside the else statement,
trace all conditions are false Your code should look like this:
if( 3 < 2) { trace("condition 1 is true"); } else { trace("all conditions are false"); }
8 Test the movie Notice the message in the Output window indicating all
conditions are false Close the preview window when you are finished
9 Between the if statement and the else statement, create a compound else
if statement that is true if 3 is less than 2 OR if 3 is greater than 2 Inside the else if statement, trace condition 2 is true Your code should look like this:
if( 3 < 2) { trace("condition 1 is true"); } else if( 3 < 2 || 3 > 2) { trace("condition 2 is true"); } else { trace("all conditions are false"); }
10 Test the movie Notice the message in the Output window indicating
condition 2 is true Close the preview window and look over the code again to make sure you understand how it is working
11 Close the file You do not need to save your changes
C H A P T E R
NDERSTANDING LOOPS
A loop is a block of code that runs a certain number of times Loops help you to perform tasks where you repeat yourself Using loops, it is just as easy to run a block of code one time as it is to run a block of code a thousand times You will use loops often when you create games later on
Writing a For Loop
There are a few different types of loops, but the one you will be working with most is called a for loop The following code shows a basic for loop that will run 20 times
for(var i:Number = 0; i < 20; i ++) { // this is the code that is looped }
A for loop begins with the for keyword Then, in parentheses there are three elements, separated by semicolons The first element is the loop variable In this case, there is a variable called i that is a number data type with a value of zero This number is known as the loop index The loop index can be used inside the loop I will talk about using the loop index later The second element states how long the loop will run The code in the preceding sample will run as long as the i variable is less than 20 Because the i variable has an initial value of zero, the loop will run 20 times If you tested the movie with this code in your actions layer, you would see the numbers 0 through 19 in your Output window This is because the variable i has an initial value of 0, and the loop stops running once i is equal to 20 Each time a loop runs is called an iteration The third element tells Flash what to do if the condition in the middle is not true after the block of code in the curly braces runs In this case, the i variable will increment by 1 It is important to note that a loop runs a certain number of times, but it is instantaneous in actual time In other words, if you used a loop that ran 20 times, and added 1 to the X position of a movie clip each time the loop ran, you would not see the movie clip animate Instead, you would see the movie clip 20 pixels from its starting point
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