Tag Archives: as3

TextLineMetrics

Actionscript:
  1. var word:String = "TextLineMetrics are useful";
  2. var letters:Array = word.split("");
  3.  
  4. var pre:TextField;
  5. for (var i:int = 0; i<letters.length; i++){
  6.     var t:TextField = new TextField();
  7.     t.defaultTextFormat = new TextFormat("Arial", 40);
  8.     t.autoSize = TextFieldAutoSize.LEFT;
  9.     t.textColor = int(Math.random() * 0xFFFFFF);
  10.     t.text = letters[i];
  11.     if (pre){
  12.         var metrics:TextLineMetrics = pre.getLineMetrics(0);
  13.         t.x = metrics.width + pre.x;
  14.     }
  15.     pre = t;
  16.     addChild(t);
  17. }

Sometimes you need to do something to a TextField one letter at a time. One way to do this is to create a separate TextField for each letter and position them based on the TextLineMetrics object. This snippet creates textFields for a string and colors each TextField randomly.

Posted in string manipulation, strings | Also tagged , | 6 Comments

QuickBox2D Editor

When I first created QuickBox2D I simultaneously developed a simple editor to aid in the creation of complex simulations. The result is very alpha and should be used cautiously. There is no UI, it is entirely key controlled. It generates actionscript files that can be copy and pasted into working simulations. It also has a preview mode for previewing simulations as you develop them. This is by no means a full featured editor, there is a good deal of work to be done on it. I am releasing the code as a simple zip for people who would like to develop it further. If there is enough interest I'll create some kind of code repositiory, but for now I'm just releasing the below zip.

Take a look at the editor

Download the Source

I may post further instructions for the editor in the future... Remember to save your work frequently and to create new versions for every change that you make to a file.

Suggested Features:
Simple GUI
Base64 encoding for get string

Known Issues:
Making joints that don't touch things can break the preview app.

Posted in QuickBox2D | Also tagged , , , | 24 Comments

Gesture Capture Performance

I'll be doing a drawing performance using something I created called Gesture Capture tomorrow April 9th in Brooklyn at the former Engine Co. 212 firehouse. The performance will happen at random intervals between 6pm and 10pm. There will be two other performances going on by Julie Fotheringham, Vera Angelica and Zahava Rozman. Here is some additional information:

Gesture Capture Video and Information
Engine 212 Northside Town Hall Website
google map

Posted in Announcements | Also tagged , | 2 Comments

Recursion Form

Actionscript:
  1. x = y = 10
  2. graphics.lineStyle(1,0);
  3. drawBox(6);
  4.  
  5. function drawBox(iter:Number=10, count:Number=1, y:Number=0, w:Number=500):void{
  6.        if (count <iter){
  7.                var width:Number = w / count
  8.                for (var i:int = 0; i<count; i++){
  9.                    graphics.drawRect(i * width, width * count/w, width, width);
  10.                }
  11.                count++;
  12.                drawBox(iter, count, y, width);
  13.        }
  14. }

This small snippet just draws this image:

If you have an idea for a short recursive snippet. Feel free to post it in the comments.

Posted in Graphics, functions | Also tagged , | 6 Comments

QuickBox2D Editor 2B Released

I'll be releasing the QuickBox2D on googlecode in the near future based on the response to yesterdays post.

Posted in QuickBox2D | Also tagged , , , | 15 Comments

AS Quiz #18

Today's quiz is about BitmapData and the Graphics class...

Number of Questions : 5
Difficulty : Medium
Topic : BitmapData, Graphics

True or False. Subpixel x and y coordinates for DisplayObjects are made possible by anti-aliasing.



Which of the following methods would you use to set a pixel with an alpha channel value?





Which of the following methods would you used if you wanted to boost performance when drawing to a BitmapData object?




True or False. Perlin Noise is built right into the BitmapData class.



Which of the following methods does not exist in the Graphics class?











Posted in Quiz | Also tagged , , | 8 Comments

Logistic Map Play

Actionscript:
  1. var offX:Number = 100;
  2. var offY:Number = 300;
  3. var scalarX:Number = 6;
  4. var scalarY:Number = 200;
  5. addEventListener(Event.ENTER_FRAME, onLoop);
  6. function onLoop(evt:Event):void{
  7.     var r:Number = mouseY / 100;
  8.     var xn:Number = (mouseX - 100) / 650;
  9.     var xn1:Number = 0;
  10.     graphics.clear();
  11.     graphics.lineStyle(0,0);
  12.     for (var i:int = 0; i<100; i++){
  13.       xn1 = r * xn * (1 - xn);
  14.       xn = xn1;
  15.       if (i == 0){
  16.         graphics.moveTo(offX+i*scalarX,offY+xn1*scalarY);  
  17.       }else{
  18.         graphics.lineTo(offX+i*scalarX, offY+xn1*scalarY);
  19.       }
  20.     }
  21. }

Whenever I can't decide what kind of snippet to make, I simply go to wikipedia or mathworld for a bit and I always end up with something. I've messed with Logistic Maps before (when learning about strange attractors). This is a simple rendering where the x and y axis change the biotic potential (r) and the starting value for x.

Here is the link I used for reference.


Have a look at the swf (just move your mouse around).

Posted in Graphics, Math, misc | Also tagged , | 2 Comments

Color Words Motion Capture

We're still working on this long term project for medialab prado in madrid. Here is a camera test from today. It uses frame differencing and places names of colors on the areas of motion.


Click here to view the swf file... make sure to move around a bit in front of your web-cam.

Posted in Announcements, misc | Also tagged , , | 2 Comments

Connect The Dots E8

Actionscript:
  1. [SWF(width = 500, height = 500)]
  2. const TWO_PI:Number = Math.PI * 2;
  3. var centerX:Number = stage.stageWidth / 2;
  4. var centerY:Number = stage.stageHeight / 2;
  5. addEventListener(Event.ENTER_FRAME, onLoop);
  6. function onLoop(evt:Event):void{
  7.     // data
  8.     var points:Array = [];
  9.     var i:int = 0;
  10.     var pointNum : int = Math.max(2,int(mouseX / 12))
  11.    
  12.     var radius:Number = 200;
  13.     var step:Number = TWO_PI / pointNum;
  14.     var theta:Number = step / 2;
  15.     for (i = 0; i<pointNum; i++){
  16.         var xp:Number = centerX + radius * Math.cos(theta);
  17.         var yp:Number = centerY + radius * Math.sin(theta);
  18.         points[i] = new Point(xp, yp);
  19.         theta += step;
  20.     }
  21.     // render
  22.     graphics.clear();
  23.     graphics.lineStyle(0,0);
  24.     for ( i = 0; i<pointNum; i++){
  25.      var a:Point = points[i];
  26.      for (var j:int = 0; j<pointNum; j++){
  27.         var b:Point = points[j];
  28.         if (a != b){
  29.            graphics.drawCircle(a.x, a.y, 10);
  30.            graphics.moveTo(a.x, a.y);
  31.            graphics.lineTo(b.x, b.y);
  32.         }
  33.      }
  34.    }
  35. }

I've been using this geometric shape for lots of different things recently. Including during consulting gigs as a helpful visualization. Just move your mouse left and right... I particularly like the simpler forms you get by moving your mouse to the left (triangles squares and simple polygons):

While not entirely related this wikipedia article is interesting.

[EDIT : Thanks to martin for reminding me that I can do away with the if statement here in the above code ]

Actionscript:
  1. graphics.clear();
  2. graphics.lineStyle(0,0);
  3. for (i = 0; i<pointNum; i++) {
  4.     var a:Point=points[i];
  5.     for (var j:int = i+1; j<pointNum; j++) {
  6.         var b:Point=points[j];
  7.         graphics.drawCircle(a.x, a.y, 10);
  8.         graphics.moveTo(a.x, a.y);
  9.         graphics.lineTo(b.x, b.y);
  10.     }
  11. }
  12. graphics.drawCircle(a.x, a.y, 10);

I implemented that change over at wonderfl and it works nicely

Posted in Graphics, Math, misc | Also tagged , | 4 Comments

Nonsense Clocks

Actionscript:
  1. [SWF(width = 500, height=500, backgroundColor=0x000000)]
  2.  
  3. var clockNum:int = 100;
  4. var clocks:Vector.<Function> = new Vector.<Function>(clockNum, true);
  5.  
  6. var clockContainer:Sprite = Sprite(addChild(new Sprite()));
  7. clockContainer.x = stage.stageWidth / 2;
  8. clockContainer.y = stage.stageHeight / 2;
  9. buildClocks();
  10. runClocks();
  11.  
  12. function buildClocks():void{
  13.     for (var i:int = 0; i<clockNum; i++){
  14.         var theta:Number = Math.random() * Math.PI * 2;
  15.         var radius:Number = Math.random() * 200;
  16.         var xp:Number = radius * Math.cos(theta);
  17.         var yp:Number = radius * Math.sin(theta);
  18.         clocks[i] = makeClock(xp,yp,Math.random() * Math.PI * 2);
  19.     }
  20. }
  21. function runClocks():void{
  22.     addEventListener(Event.ENTER_FRAME, onRunClocks);
  23. }
  24. function onRunClocks(evt:Event):void{
  25.     for (var i:int = 0; i<clockNum; i++){
  26.         clocks[i]();
  27.     }
  28.     clockContainer.rotationX = clockContainer.mouseY / 30;
  29.     clockContainer.rotationY = -clockContainer.mouseX / 30;
  30. }
  31. function makeClock(x:Number, y:Number, time:Number=0):Function{
  32.     var radius:Number = Math.random() * 20 + 5;
  33.     var border:Number = radius * 0.2;
  34.     var smallRadius:Number = radius - radius * 0.3;
  35.    
  36.     var clock:Sprite = Sprite(clockContainer.addChild(new Sprite()));
  37.     clock.x = x;
  38.     clock.y = y;
  39.     clock.z = 100 - Math.random() * 200;
  40.     clock.rotationX = Math.random() * 40 - 20;
  41.     clock.rotationY = Math.random() * 40 - 20;
  42.     clock.rotationZ = Math.random() * 360;
  43.     return function():void{
  44.         with (clock.graphics){
  45.             clear();
  46.             lineStyle(1,0xFFFFFF);
  47.             drawCircle(0,0,radius + border);
  48.             var xp:Number = smallRadius * Math.cos(time/2);
  49.             var yp:Number = smallRadius * Math.sin(time/2);
  50.             moveTo(0,0);
  51.             lineTo(xp, yp);
  52.             xp = radius * Math.cos(time);
  53.             yp = radius * Math.sin(time);
  54.             moveTo(0,0);
  55.             lineTo(xp, yp);
  56.         }
  57.         time+=0.1;
  58.     }
  59. }


You can go check the swf out at wonderfl.net...

Posted in 3D, Graphics, misc, motion | Also tagged , | 3 Comments