This demo was written by Sankarshan Dudhate.
//Called when application is started. function OnStart() { //Create a layout with objects vertically centered. lay = app.CreateLayout( "linear", "VCenter,FillXY" ); //Get size for a square imsge var siz=square(1); //Create an empty image to act as our drawing canvas of full width and height. img = app.CreateImage(null,siz.w,siz.h); //img=app.CreateImage(null,1,1); lay.AddChild(img); //Add it to layout. img.SetColor("#ffffffff"); //Set colour of our canvas to white. img.SetPaintColor("#ff000000"); //Set colour objects darwn on canvas to 'Black'. img.SetPaintStyle("Line"); //Set style of objects drawn on canvas to 'Line.' img.SetLineWidth(3); //Set LineWidth of obiects drawn to 3 pixels. img.DrawCircle(0.5,0.2,0.18); //Draw a circle with center at (0.5,0.2) and radius 0.18 of device's width. img.SetPaintStyle("Fill"); //Set style of objects drawn to 'Fill'. img.SetPaintColor("#ff444444"); //Set colour of objects drawn to 'Gray'. img.DrawCircle(0.42,0.16,0.04); //Draw circle with center at (0.42,0.16) and radius 0.04 img.DrawCircle(0.57,0.16,0.04); //Center at (0.57,0.16) and radius 0.04. img.SetPaintColor("#ff0000"); //Set colour of objects drawn to 'Red'. //Draw an arc. //Pattern : (x1,y1,x2,y2,StartAngle,EndAngle). img.DrawArc(0.43,0.22,0.57,0.28,0,180); //Add layout to app. App will be empty if no layout is added. app.AddLayout( lay ); } function square(size) { var ratio = app.GetDisplayWidth() / app.GetDisplayHeight(); var ret={}; if (ratio >= 1) // landscape { ret.w = size / ratio; ret.h = size; } else { ret.w = size; ret.h = size * ratio; } return ret; }