Page de Jean-Paul Molina

Heart beat monitor

 

The purpose is to show the aftercare of heart beat like in an hospital. This example use des sprites and scripts.
I suppose you know well how to create objects, thus I will not insist on.

⇒ animation ⇐

Remarks :
- When a set of pulses is emitted, the first echoe has got for theoritical form sint / t which takes the value 1 when t -> 0. We gonna reproduce it. We'll use a tracer to simulate scanning.
- In a script with onEnterFrame(), we can't use PlaySound method, unlike to onFrame().
So I'll use the following trick : inserting an empty sprite with an embedded sound.

At first, Download sound.  

Import it : item Content / Sounds / Import

Creating Objects

1 - Set up Movie sizes 400x400 ( background color #000033). Frame Rate200.

2 - Now create a circle green colored : X = 0 Y = 0 W = 2 H = 2
Anchor point : Center

3 - Convert into sprite ( name : dot , Target toggled )
Menu Modify / Convert / Convert to sprite.

4 - Then create an horizontal line green colored : X = 0 Y = 200 W=160

Convert into sprite.

5 - Create another horizontal line green colored : X = 240 Y = 400 W=160 ( line : 2 )
Convert into sprite. (nom : right Target : coché )

6 - Now create a vertical line red colored (Anchor point : Bottom center )
X = 200 Y= 200 H = 100

Convert into sprite.

7 - Then create a circle red colored X = 0 Y = 200 W = 2 Y = 2
Set a radial color gradient. (W+R+W)

Convert into sprite.

8 - Create an empty sprite : menu Insert / Sprite.
Name it son Target toggled.

Scripts

In Outline, select Scene_1. Enter the following script :

onLoad()
{
   // decrease horizontal line alpha
   right._alpha = 50;
   left._alpha = 50;
   // height width scene
   H = int(_root._height);
   W = int(_root._width);
   a = 100; // scale
   n = 800; // number of points
}

function f ( xxx )
{
   if ( xxx == 0 ) return 1; // ( sin t / t) → 1 when t → 0
   return ( Math.sin(xxx) / xxx );
}

onFrame (1,afterPlacedObjectEvents)
{
   // set a range
   xn = -40; xp = 40;
   increment = (xp-xn) / n;
    // display ( sin t / t )
   for (i=1; i < n; i++)
   {
      duplicateSprite(dot, "dot"+i, i);
      ("dot"+i)._alpha = 40; // decrease alpha
      ("dot"+i)._X = (W / 2) + xn + i*increment;
       yr = a*f(xn + i*increment);
      ("dot"+i)._Y = (H / 2) - yr;
   }
   dot._alpha = 0; // 0 for the basic sprite
}

In Outline, select sprite son. Enter the following script :

onFrame(1) { stop(); } // don't play at startup
onFrame (2) { playSound("beat.wav"); }

In Outline, select sprite spot. Enter the following script :

onLoad()
{
   _X = 0; // initial position
      _alpha = 100;
}
onEnterFrame(includingFirstFrame)
{
   _X += 2; // increase X 2 pixels
    // if in X-range (sint /t) , we hide
   if ( (_X >= 160) && (_X < 240) )
       _alpha = 0;
   else _alpha = 100; // either display
   // off right limit? go back initial pos.
   if ( _X >= _root.W) _X = 0;
}

In Outline, select sprite beep. Enter the following script :

onLoad()
{
   _X = 0; // initial position
   _yscale = 2; // % Y-scale
   delta = 0; // init
}
onEnterFrame(includingFirstFrame)
{
   _X += 2; // increase 2 pixels
    debut = 160; // end of H-line left
    fin = debut + 80; // beginning of line right
    /* In the range of (sin t / t) we build a vertical
    line whose end follows the curve, which simulates scanning */
   if ( (_X >= debut) && (_X < fin) )
   {
      start = -40;
      _yscale = _root.a * _root.f( start + delta) ;
      if ( (start + delta) == 0) _root.son.gotoAndPlay(2);
      delta += 2; // folllow _X
   }
   else // beyond right limit? go back
   if ( _X >= _root.W)
   {
      _yscale = 2;
      _X = 0;
      delta = 0;
   }
}

Et voilà, that's it.