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Tutorials » Actionscripting/Expert

Dynamic masking using the drawing API
Author: Patrick Mineault | Website: http://dakar.netqcca.com |

Movie 2: The pixelated fade-in effect

I'm sure you've all seen this in Powerpoint or Director but this nice effect is rarely seen in Flash: random pixels of an image appear successively until the entire image is shown. Although there are some difficulties associated with randomization, this effect is still simple enough to grasp conceptually that it may be shown here. Using a "maskee" movie clip as with the previous movie, you may add the following script to clip:

onClipEvent(load)
{
 numY = 26;
 numX = 120;
 numPerFrame = 12;
 currSquare = 0;
 choices = new Array();
 for(i = 0; i 
Now if you test the movie you should get a nice pixelated fade in effect: 5x5 pixel squares successively appear randomly on the screen. Now I don't expect you to understand every detail of the preceding script but it should
 give you some hints on using dynamic masks to create fade-ins.



The main  difficulty consists of randomly choosing the squares that will be
 drawn on a given turn. Squares are numbered from the top left. An array is
 created called choices which initially contains
 the numbers
 of all
 the
 squares.
 At
 some point in the enterFrame event, an element in
 the array is randomly picked and kept in memory. A switch is made with the
 last item in the
 array and the array is popped, meaning the last element is removed. Then this
 square is drawn on the screen.
As you see this script uses basically the same drawing routine as the previous
 one but in a different context. It uses the same trick
 as the first movie in creating the
 mask: as long as the clear function is not called, everything that is drawn in the target clip is kept in memory and all subsequent shapes add up. This gives us a nice fade-in effect.






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Added: : 2004-03-26

Rating: 7.73 Votes: 15

Hits: 1084





» Author



 Always looking for a new challenge, I'm going to Senegal this summer to lend my computer skills in a volunteering project. I'm sending you this tutorial as part of my fundraising campaign, see http://dakar.netqcca.com . Enjoy!



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