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Scripting Additional Instances using random, and removing. Part 2

See the movie on the right and download theFLA=>

This tutorial will show the use of  "random" function and how you can use it to affect the way your movie acts.  We will build on the duplicate movie clip tutorial and by using random, we will randomly affect the number of flies added and deleted, where the flies appear on the stage, and the size of the flies.

 

To use the "random" function we first have to understand that it does.  The expression - 

** variableX = random(NNN) ** where NNN is any number, will return an integer in VariableX from 0 to NNN-1.

 

REVIEW

1. Open the Duplicate_Movie_Clip.fla that you created last time or download it from ????????.

2. In scene 1 layer 2 frame 1 you should have an action script of  "var x = 1". In frame 2 you should have an action script of "stop( )".

3. In scene 1 layer1 frame 1 your fly movie clip should have an instance name of "fly_1"

4. The action script in the Add button looks like this.

 

NEW SCRIPTS

5. We are now ready to start modifying the script for multiple random instances! With your select tool click on your Add button to highlight it.

6. On the actions panel, change to expert mode.

  • This action script will be triggered by the press of the mouse on the Add button
  • In this action script we will set up new variables to be used elsewhere (numswatted, numfly).
  • We will create a "Do while" loop to create a random number instances per click from 1 to 10;
  • We will randomly change the percent x and y scale property for the fly, from 1 to 100.
  • We will randomly change the position (x and y coordinates) that the fly movie instance appears on the stage.

Your script should look like this:

7. Save and Play your movie. You will see that you will increase the number of movie clips from 1 to 10 with each click of the button. With this example the fly_ clips are loaded at different _x, _y coordinates, and the flies are different sizes.

8. We are now ready to delete some of the flies.

9. Drag another button on to the stage lower left corner, and using you text tool type "SWAT" on the button.

10. With your select tool click on the add button to highlight it.

11. On the actions panel, change to expert mode.

  • This action script will be triggered by the "press" of the mouse on the delete button
  • We will create a "Do while" loop to delete a random number instances per click from 1 to 10
  • We will test using an if statement that there are still enough flies 
  • We will test that there is always 1 fly left to prevent errors in the index. (Indexes can not go negative) 

Your script should look like this:

12. Play your movie. You will see that you will decrease the number of movie clips from 1 to 10 with each click of the button. 

13.  Finally lets add a few displays to see how many flies we have and how many we swat.

  • Insert New Symbol, name it "Number Swatted" and make its behavior movie.
  • Take you rectangle tool, make the colour dark blue, and draw a rectangle 150 pixels wide by 75 pixels high
  • Select your text tool size 20 fill white and type "Number Swatted" 
  • Select your text tool size 20 fill white and type "00" and give it a variable name of "varnumswatted"
  • Insert New Symbol, name it "Number of Flies" and make its behavior movie.
  • Take you rectangle tool, make the colour dark blue, and draw a rectangle 150 pixels wide by 75 pixels high
  • Select your text tool size 20 fill white and type "Number of Flies" 
  • Select your text tool size 20 fill white and type "01" and give it a variable name of "varnumfly"
14. Go to Scene 1 drag the symbol "Number Swatted" on to the stage down at the bottom of the stage.
  • Select the "Number Swatted"
  • Open your Action Panel in expert mode.
  • To access a variable we have to know what level it is on.  Most variables should be on _level0.
  • This action will be trigger by a mouseup.

Your script should look like this:

15. Go to Scene 1 drag the symbol "Number of Flies" on to the stage down at the bottom of the stage beside "Number Swatted"..
  • Select the "Number of Flies"
  • Open your Action Panel in expert mode.
  • To access a variable we have to know what level it is on.  Most variables should be on _level0.
  • This action will be trigger by a mouseup.

Your script should look like this:

16. Play your movie. You will see that you when you click ADD the number in the "Number of Flies" increases randomly by 1 to 10, when you click SWAT the "Number Swatted" if from 1 to 10, and the number of flies decreases by the same amount.

 



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