Flash MX 2004 Games : Art to ActionScript

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9 Using loops If there is one thing that computers are good at (but if yours has just crashed then you might be forgiven for thinking they are good at precious little) it is doing boring repetitive jobs. In this chapter we will look at how you can tell your program to repeat and repeat and repeat. No programming language would be complete without the ability to repeat sections of code several times. Games regularly need to run a section of code several times. In this chapter we will look at creating sections of code that repeat and show you how to control the program flow in these situations. We will learn how to jump out of the code if a certain condition is met. We will consider using repeats that run at least once and repeats that may never run at all. One of the most important aspects of using loops is the initializing of the data used in a loop. We will look at the potential pitfalls from initialization errors. Creating sections of code that repeat Flash has several options for repeating; the first option is used when you already know how many times you want to repeat a section of code. In this circumstance you use the ‘for’ statement: sum = 0; for(i=1; i
Chapter 9: Using loops and the repeat code takes 0.4 from its value for each loop. The loop continues while n is greater than zero. count = 0 for(n=-100; n>0; n-=0.4){ count++; } You don’t need to use a loop variable at all; the following example is perfectly legal. i = 1; sum = 0; for(;;){ if (i>100) break; sum += i++; } Here we initialize two variables, i and sum, before entering the ‘for’ loop. Inside the loop we test to see if i is greater than 100, if it is then we use the ‘break’ statement. This causes the program to jump out of the ‘for’ loop immediately. If the ‘break’ condition is not met then the current value of i is added to the variable sum and then the variable i is incremented. The last line in the loop could have been changed to: sum = sum + i; i = i + 1; Both code snippets do the same thing. Most people get into a way of writing code that they are happy with, and unless you work in a big team you will be able to write the code the way you choose. Personally, unless the case is very obvious, I would discourage using multiple code in a single line. I would prefer: sum += i; i++; In the above example it is pretty clear what is happening but ... if ((code++)(23 * getCode(i--, n++))){ //Hmm is this going to happen or not } 119
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Flash MX 2004 Games
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Flash MX 2004 Games Art to ActionSc
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Contents at a glance Introduction x
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Contents in summary Introduction xi
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Contents in summary Chapter 15: Maz
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Introduction: Learn to write Action
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1 Your first game Rather alarmingly
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Chapter 1: Your first game view of
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Using the Line tool Chapter 1: Your
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Chapter 1: Your first game Adding t
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Chapter 1: Your first game is true
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Chapter 1: Your first game would tr
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_x = startX; _y = startY; moveX = 0
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Section 1 Animation The first secti
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Flash MX 2004 Games Using the drawi
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Flash MX 2004 Games Figure 2.7 Stag
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Flash MX 2004 Games The Pencil tool
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Flash MX 2004 Games When you use th
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Flash MX 2004 Games Figure 2.25 Sca
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Flash MX 2004 Games To use a gradie
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Flash MX 2004 Games tweening was se
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Flash MX 2004 Games Figure 2.37 Usi
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3 Simple cut-out animation Flash is
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Flash MX 2004 Games Figure 3.4 Sele
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Flash MX 2004 Games Figure 3.7 Usin
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Flash MX 2004 Games Figure 3.10 The
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Flash MX 2004 Games pressing F5. Th
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Flash MX 2004 Games WalkLeft TurnLe
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4 Using CGI programs to create anim
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Flash MX 2004 Games that sometimes
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Flash MX 2004 Games As you get expe
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Flash MX 2004 Games colour layer us
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Flash MX 2004 Games A higher settin
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5 Background art All your games wil
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Flash MX 2004 Games Figure 5.3 A si
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Flash MX 2004 Games better to expor
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Flash MX 2004 Games if it is only d
Page 82 and 83: Figure 5.10 Using symbols to add te
Page 84 and 85: Flash MX 2004 Games independent whe
Page 86 and 87: Flash MX 2004 Games Using photograp
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Page 90 and 91: Flash MX 2004 Games 3 Choose ‘png
Page 92 and 93: Flash MX 2004 Games User input on m
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Page 97 and 98: 7 So what is a variable? After the
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Page 115 and 116: 8 In tip-top condition Should I go
Page 117 and 118: Chapter 8: In tip-top condition All
Page 119 and 120: Chapter 8: In tip-top condition Wit
Page 121 and 122: } } return false; Chapter 8: In tip
Page 123 and 124: Figure 8.5 Properties window for th
Page 125 and 126: Chapter 8: In tip-top condition to
Page 127 and 128: Chapter 8: In tip-top condition Tab
Page 129 and 130: Figure 8.12 The anchor point for th
Page 131: 53 return 4; 54 } 55 } 56 } Listing
Page 135 and 136: Chapter 9: Using loops Now instead
Page 137 and 138: do{ a++; if (a==10) continue; //Do
Page 139 and 140: Chapter 9: Using loops Two examples
Page 141 and 142: Figure 9.2 The Loops01 project at r
Page 143 and 144: Chapter 9: Using loops Creating sim
Page 145 and 146: Chapter 9: Using loops Creating phy
Page 147 and 148: 1 //Initialise firing 2 for (i=0; i
Page 149 and 150: Chapter 9: Using loops heart of alm
Page 151 and 152: Chapter 10: Keep it modular a game
Page 153 and 154: Chapter 10: Keep it modular for(j=0
Page 155 and 156: Chapter 10: Keep it modular From a
Page 157 and 158: Chapter 10: Keep it modular To call
Page 159 and 160: 4 pt2.init(20, 30); 5 pt2.sum(pt1);
Page 161 and 162: Chapter 10: Keep it modular a locat
Page 163 and 164: Chapter 10: Keep it modular 1 v1 =
Page 165 and 166: Chapter 10: Keep it modular Summary
Page 167 and 168: Chapter 11: Debugging would give th
Page 169 and 170: 4 trace("n = " + n); 5 6 function s
Page 171 and 172: 5 onClipEvent(enterFrame){ 6 count+
Page 173 and 174: 10 name = "Box" + i; 11 eval(name).
Page 175 and 176: Chapter 11: Debugging 5 switch(i){
Page 177 and 178: Chapter 11: Debugging Using the Fla
Page 179 and 180: the Watch window, then you can see
Page 181 and 182: Figure 11.12 Debugging remotely Cha
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is presumed, www.niklever.net/flash
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Chapter 12: Using external files Th
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Chapter 12: Using external files Wh
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with a query string version: Chapte
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Figure 12.3 Developing the Weather
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function loaded(success){ if (succe
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Chapter 12: Using external files
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13 Small games to keep them loading
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Chapter 13: Small games to keep the
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Figure 13.7 Developing the Pong gam
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14 Quizzes Quizzes are a very popul
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Chapter 14: Quizzes For now we will
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Figure 14.5 Creating a user Chapter
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Figure 14.8 Setting user permission
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Remember that a querystring takes t
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Chapter 14: Quizzes 36 "\’, diffi
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Chapter 14: Quizzes the query strin
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s.Close(); conn.Close(); Response.W
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Chapter 14: Quizzes 1 function setQ
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5 status = "Question deleted"; 6 }
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Chapter 14: Quizzes Summary Most of
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Chapter 15: Mazes The strategy used
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Chapter 15: Mazes Notice that the f
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Chapter 15: Mazes 128, and exclude
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Figure 15.3 Creating the tunnel mod
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Chapter 15: Mazes Open ‘Examples\
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Chapter 15: Mazes sequence to show
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64 Tunnel.gotoAndPlay("T_Right"); 6
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Chapter 15: Mazes 32 dir = EAST; 33
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Chapter 15: Mazes Summary In common
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Figure 16.1 The traditional game Re
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5 cBoard = new Array(64); 6 pBoard
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Chapter 16: Board games 6 }else{ 7
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Chapter 16: Board games Once the pl
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Chapter 16: Board games Here ‘row
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19 }else{ 20 flip[2] = false; 21 }
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8 if (flip[6]) flipArrayLine(i, pie
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Chapter 16: Board games this way, i
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A simple example Figure 17.1 Develo
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Chapter 17: Platformers game much e
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Chapter 17: Platformers If the cat
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Chapter 17: Platformers 11 break; 1
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Chapter 17: Platformers 96 gotoAndP
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a metre. Therefore u − 20t = 0 an
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56 }else if (moveY-4){ 57 moveY -=
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13 name = "_root.Bin" + i; 14 dx =
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16 mc.scale = 1.0; 17 } 18 19 House
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Chapter 17: Platformers 68 }else if
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Chapter 17: Platformers array, ‘d
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Figure 18.1 Developing the football
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5 ScoreB = 0; 6 playerTeam = RED; 7
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50 Pitch.Red2.targetx = -96; 51 Pit
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Chapter 18: Sports simulations Havi
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Chapter 18: Sports simulations 37 k
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Chapter 18: Sports simulations 37 i
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Chapter 18: Sports simulations Upda
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26 break; 27 } 28 } 29 name = "_roo
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Chapter 18: Sports simulations 27 v
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Chapter 18: Sports simulations 1 fu
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Chapter 18: Sports simulations For
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Chapter 18: Sports simulations 22 _
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Section 4 Flash for mobiles The mob
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Flash MX 2004 Games Table 19.1 Synt
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Flash MX 2004 Games ‘Device sound
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Flash MX 2004 Games The game uses k
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Flash MX 2004 Games 316 Table 19.2
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20 Using Flash on a PocketPC Pocket
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Flash MX 2004 Games 1 2 3 Conker
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Flash MX 2004 Games 5 }else { 6 //
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Flash MX 2004 Games Figure 20.5 ‘
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Flash MX 2004 Games Reading the mai
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21 High score tables High score tab
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Chapter 21: High score tables Notic
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Figure 21.3 Creating an Access data
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Chapter 21: High score tables 12 Se
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Chapter 21: High score tables 1 so
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Chapter 21: High score tables ‘ge
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Chapter 21: High score tables Assum
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37 " has been set to " + score); 38
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Chapter 21: High score tables 19 fu
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22 Multi-player games using sockets
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Chapter 22: Multi-player games usin
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The possible tags in this example a
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Figure 23.1 Select Add/Remove Progr
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Figure 23.5 Configuring IIS Figure
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Figure 23.8 Running several simulta
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Chapter 23: Using Flash Communicati
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Figure 23.11 Live Log tab of the ad
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24 Embedding Flash In this chapter
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Chapter 24: Embedding Flash You can
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Figure 24.5 Choosing the source fil
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Chapter 24: Embedding Flash A dialo
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Chapter 24: Embedding Flash resourc
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Chapter 24: Embedding Flash can be
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Chapter 24: Embedding Flash 46 { 47
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Appendix A: Integrating Flash with
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Figure A.2 Importing the Flash inte
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Appendix A where ‘clipName’ is
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Appendix B: Tweening in code The ea
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Figure B.1 The graph of y = x 2 App
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Appendix B Joining together curves
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Appendix B want the result to start
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Figure B.7 Creating the tweening pr
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Appendix B Creating keyframes So fa
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and if the curve section is between
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} switch (channel){ case 0: return
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Bibliography Art The Illusion of Li
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Index 3D Studio Max animations, 54
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Buttons: concepts, 6, 113-15, 126-8
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fashions, 60 simplicity benefits, 3
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Floats: bugs, 96 concepts, 95-7 Flu
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Lightwave modeller, 46-54, 69, 226,
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Paint Bucket tool, 4, 5, 27-9 optio
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Set Score button, 340-2 Set-top box
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outline, 17 sections, 17, 21-8 usag
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