thanks I guess my problem is I am not getting the concept right. Love to see a tutorial, but cannot find one. In the following sample, how do I animate the trasnformations (in the touch_began function) so that the drawing in the draw() function will move, scale and flip to my touch point ? Using layer.draw(), how do I go about doing this?

# coding: utf-8
from scene import *
import ui

class MyScene(Scene):
            
        def draw(self):
            
            
            startx = 20
            starty = 20
            length = 100
            width = 200
            
            #simple shape
            # begin location
            fill(.5,.5,.5)
            rect(startx, starty, width, length )
            fill(0,1,0)
            rect(startx*2, starty, width/2, length/2)
            fill(1,0,0)
            ellipse(startx*2, starty*2, 10,10)
            ellipse(startx*8, starty*2, 10,10)
            
    
            
        def touch_began(self, touch):
            #end location
            print touch.location.x, touch.location.y
            push_matrix()
            scale(1.5, 1.5)
            translate(touch.location.x, touch.location.y)
            rotate(180)
            pop_matrix()
            
            
class SceneViewer(ui.View):
    def __init__(self, in_scene):
        
        self.present('fullscreen')
        self.scene_view = SceneView(frame=self.bounds)
        self.scene_view.scene = in_scene
        self.add_subview(self.scene_view)


SceneViewer(MyScene())

I am just starting to experiment with scenes and I have a question. I have drawn a complex shape (e.g. a car) using lines, rects and ellipses on the scene. If I want to animate the whole shape with a sequence of rotate, scale, translate, how should I go able that? I tried layers, but it does not support drawings functions on the layer itself. Appreciate any pointers.

thanks for the replies, I think I understood it better now. One more question, how I keep the input focus to a field if it fails a validation, but still allow the user to cancel or click the X button to close the view?

Thanks for the replies, both suggestions worked.

Is it possible to pass a username password to http Basic Auth in ui.webview? thx.

reading through the doc, I understand that I can use delegate object to to implement the functions textField_did_change to implement validation. However, I cannot find any concrete example on this. I suppose I can test for the length!=0 and issur an alrt box, but do I need to raise any exception or call a built in to stop the processing when it failed such test? Any pointers?