Drawing demo

//drawing.js
var lastev = [];
lastev.action = "Up";
lastev.x = 0;
lastev.y = 0;
var img
  //Called when application is started. 
function OnStart()
{
  //Create a layout with objects vertically centered. 
  var lay = app.CreateLayout("Linear", "FillXY");
 
  //Create a blank image. 
  img = app.CreateImage(null, 0.8, 0.8);
  lay.AddChild(img);
  var btn = app.CreateButton("Save");
  btn.SetOnTouch(btn_OnTouch);
  lay.AddChild(btn);
  //Add layout to app.	 
  app.AddLayout(lay);
  //Draw blank picture. 
  DrawPicture();
}
 
function DrawPicture()
{
  //Fill image with solid white. 
  img.SetColor("#ffffffff");
  img.SetLineWidth(10);
  img.SetPaintStyle("Line");
  img.SetPaintColor("#ff8888ff");
  img.SetOnTouch(img_OnTouch);
}
 
function img_OnTouch(ev)
{
  app.Debug("=>" + ev.action + "<=");
  if (ev.action == "Up")
  {
 
  }
  else if (ev.action == "Down")
  {
    img.DrawPoint(ev.x[0], ev.y[0]);
  }
  else if (ev.action == "Move")
  {
    if (lastev.action != "Up")
    {
      img.DrawLine(lastev.x, lastev.y, ev.x[0], ev.y[0]);
    }
  }
  if (ev.action != "")
  {
    lastev.action = ev.action
    lastev.x = ev.x[0];
    lastev.y = ev.y[0]
  }
}
 
function btn_OnTouch()
{
  img.Save("/sdcard/temptest.jpg");
}