flash another look 21-nov-15 computing engineering and technology [email protected] 1...

Flash

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Apr 20, 2023 Computing Engineering and Technology [email protected]

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Flash

Flash

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Ch.Ch.Ch…Changes David Bowie

• “Only the wisest and stupidest of men never change.” – Confucius

• “Change is inevitable - except from a vending machine.” – Robert C. Gallagher

• “We cannot become what we need to be by remaining what we are.” – Max Depree

• “To change and to change for the better are two different things.” – German proverb

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Why Scripting ?

• Import and export information, create forms, network communications programs

• Personalise the user’s experience

• Control movie clips and their properties more tightly

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Why Scripting ?

• Build dynamic projects that vary according to information like weather data or the day of the week

• Dynamically control sound volume and stereo panning

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ActionScript (AS 1)

ActionScript 1 (Flash 1-5)• Good for simple interactivity• Basic “Glue” coding• Plenty of code available but – code rough• Limited capabilities led to some bad coding• Non-Standard language – loosely related to JavaScript• Was very slow• Even sloppy code runs

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ActionScript (AS 2)

ActionScript 2 (Flash 2004 – 8)• A proper OO language• Good for more complex coding• Deeper control of Flash capabilities• More flexible programming environment• Better de-bugging capabilities• Cleaner coding – more readable (transferable .dir)• Stricter syntax and error checking

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ActionScript (AS 3)

ActionScript 3 (CS3 – CS4)• Full OO language• Everything is now an object which can or has to be

called up dynamically.• Objects are embedded into objects as children ie:- the

screen is an object which has active sprites within it as children.

• A child inherits attributes from the parent as well as controlling their own attributes.

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Adaptability

• You can still program using ActionScript 1.0 in Flash MX 2004 and in Flash 8

• Performance of AS1 is good in MX 2004 and Flash 8

• ActionScript 2 code strongly resembles Java

• ActionScript 2 knowledge can easily be re-used in the industrial strength, cross-platform world of Java

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Adaptability

• The code in Flash now runs a minimum of 5 times faster than AS 1

• This opens Flash up to more potential uses especially the world of on-line and mobile games and communication using complex processing

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Tricks & Traps• AS2 upwards is case sensitive

nCounter != ncounter != NCounter

• Note older code may not workstopAllSounds(); // worksstopallsounds(); // does not when using AS2 code

• Stricter data typing improves run-time performance

• AS 2 upwards has strict data typingvar nCounter:Number = 36The variable (nCounter) of type (Number) = 36

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Loop gotoAndPlay()• Loops can be used to create a

menu section where the film is waiting for a key or mouse event to happen

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Loop gotoAndPlay()• Buttons can be used to break the

loop

• Loop.htm

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Key Class• Key press can also

be used…

• Key1.htm

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Key Class• The script needs to account for the frame the video head is moving through.

onEnterFrame = function() {

if(Key.isDown(Key.UP)){

gotoAndPlay(1);

}

}

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Screen Plotting• The screen is plotted from the top left hand corner of the user screen.

._x is the horizontal plotting position

._y is the vertical plotting position

• Objects can be placed on the desktop (off main screen) and called into position at will.

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Screen Plotting• The number relates to the

position on screen relative to screen size

• Hence – ._x =150 would be half way across a 300 pixel screen

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Screen Plotting• If you wanted an object to move onto and across the

screen you would start it off in a -._x position then give it a variable speed.

Round._x = -50

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Screen Plotting• Scroll.htm

• The scripting would go so…

var speed:Number = 10

onEnterFrame = function() {

if(Key.isDown(Key.RIGHT)) {

round._x += speed;

}

}

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Screen Plotting• The project is built up in small sections each

overlaying the next to create the effect needed.

• Key X-Y.htm

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var speed:Number =3onEnterFrame = function() {

if (Key.isDown(Key.RIGHT)){round._x += speed;round._y += speed;

} else if (Key.isDown(Key.LEFT)){round._x -= speed;round._y -= speed;

} else if (Key.isDown(Key.DOWN)){round._y += speed;round._x -= speed;

} else if (Key.isDown(Key.UP)){round._y -= speed;round._x += speed;

} else if(Key.isDown(65)) {round._x -= speed;

} else if (Key.isDown(68)) {round._x += speed;

}else if (Key.isDown(87)) {round._y -= speed;

}else if (Key.isDown(83)) {round._y += speed;

}}

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Interaction• It is then possible to begin to create imagery to

fit into the scene.

Full.htm• You begin to develop more involved interaction.

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Conclusion• Giving the user the ability to control items creates interactivity.

• Control of items is built up by creating small functions.

• Functions can work together to create sophisticated imagery and action.

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References

• ActionScript 2.0: A Real Programming Languagehttp://www.peachpit.com/articles/article.asp?p=102204

• Introducing ActionScript 2http://www.macromedia.com/devnet/mx/flash/articles/astfts_excerpt/astfts_lesson1.pdf,

http://www.macromedia.com/devnet/flash/actionscript/actionscript.html

• Kirupa ActionScript 2.0 OOPhttp://www.kirupa.com/developer/oop2/AS2OOPindex.htm

flash another look 21-nov-15 computing engineering and technology [email protected] 1...

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