Javascript for motion camera application

 //Initialise some variables.

var sensitivity = 50; //percent.

var minPeriod = 500;  //millisecs.

var mosaic = "3x3";

var snapFolder = "/sdcard/Snaps";

//Called when application is started.

function OnStart()

{   

//Fix orientation to landscape since

//most phone's cameras work this way.   

app.SetOrientation( "Landscape" );

  

//Create horizontal layout that fills the screen.

lay = app.CreateLayout( "Linear", "Horizontal,FillXY" );

 

//Create frame layout on left for camera view.

layLeft = app.CreateLayout( "Frame" );

layLeft.SetMargins( 0,0.1,0.02,0 );

lay.AddChild( layLeft ); 

   

//Create camera view control.

cam = app.CreateCameraView( 0.4, 0.8 );

cam.SetOnReady( StartDetection );

layLeft.AddChild( cam );  

//Create vertical layout on right for other stuff.

layRight = app.CreateLayout( "Linear", "Vertical" );

lay.AddChild( layRight );

//Create a text control to show logs.

txt = app.CreateText( "", 0.5, 0.4, "Multiline,Left" );

txt.SetMargins( 0,0.1,0,0 );

txt.SetPadding( 0.01,0.01,0.01,0.01 );

txt.SetTextColor( "#ffffffff" );

txt.SetBackColor( "#ff222222" );

layRight.AddChild( txt );

//Create sensitivity seek bar label.

txtSens = app.CreateText( "Sensitivity" );

txtSens.SetMargins( 0,0.05,0,0 );

layRight.AddChild( txtSens );

//Create sensitivity seek bar.

skb = app.CreateSeekBar( 0.3, -1 );

skb.SetOnTouch( skb_OnTouch );

skb.SetValue( sensitivity );

layRight.AddChild( skb );

//Create 'mosaic' spinner label.

txtTiles = app.CreateText( "Mosaic" );

txtTiles.SetMargins( 0,0.05,0,0 );

layRight.AddChild( txtTiles )

//Create 'mosaic' spinner.

var layouts = "3x2,3x3,5x5,10x10";

spin = app.CreateSpinner( layouts, 0.2, -1 );

spin.SetOnTouch( spin_OnTouch );

spin.SetText( "3x3" );

layRight.AddChild( spin );

//Set menus.

app.SetMenu( "Snap,Exit" );    

//Add main layout to app.

app.AddLayout( lay );

}

//Start motion detection.

function StartDetection()

{

//Create an image control over the top of the 

//camera view with transparency (alpha) and with a

//fixed internal bitmap the same size as camera view.

var w = cam.GetImageWidth();

var h = cam.GetImageHeight();

img = app.CreateImage( null, 0.4, 0.8, "Fix", w, h );  

img.SetAlpha( 0.5 );  

layLeft.AddChild( img );        

    

//Enable 3x3 matrix motion detection and mark

//motion detections in the image control.

cam.MotionMosaic( 3, 3, (100-sensitivity)/5, minPeriod, img );

cam.SetOnMotion( OnMotion );

//Create folder for saved pictures and

//set image size, counters etc.

app.MakeFolder( snapFolder );

cam.SetPictureSize( 1024, 768 );

maxPics = 10; count = 1; 

//Create array to hold log messages.

log = new Array(); 

Log( "Ready" );

//Start preview.

cam.StartPreview();

}

//Handle menu selections.

function OnMenu( name )

{           

    if( name=="Snap" ) 

Snap();

    else if( name=="Exit" ) 

        app.Exit();   

}

//Called when motion is detected.

//(data contains an array of detection strength 

//values corresponding to each mosaic tile)

function OnMotion( data )

{

//Show info in log.

Log( data );

//Snap a photo.

Snap();

}

//Take a picture and store to sdcard.

function Snap()

{

//Limit number of pictures by recycling

//the file names.

if( count >= maxPics ) count = 1;

else count++;

//Save picture to sdcard.

var file = snapFolder+"/Snap"+count+".jpg";

    cam.TakePicture( file );

    Log( file );

}

//Called when user touches 'sensitivity' seek bar.

//( value ranges from 0 to 100 )

function skb_OnTouch( value )

{

sensitivity = value;

ChangeSettings();

}

//Called when user touches mosaic spinner.

function spin_OnTouch( item )

{

mosaic = item;

ChangeSettings();

}

//Change the motion detection settings.

function ChangeSettings()

{

var x=3, y=2;

if( mosaic=="3x3" ) { x = 3; y = 3; }

else if( mosaic=="5x5" ) { x = 5; y = 5; }

else if( mosaic=="10x10" ) { x = 10; y = 10; }

cam.MotionMosaic( x, y, (100-sensitivity)/5, minPeriod, img );

}

//Add messages to log.

function Log( msg )

{

var maxLines = txt.GetMaxLines()-1;

if( log.length >= maxLines ) log.shift();

log.push( msg + "\n" );

txt.SetText( log.join("") );

}