Problems with Transform Animation

I'm attempting to animate a ScaleTransform when dynamically adding a canvas
inside another canvas. The animation works find if begun during the MouseDown
event of the child canvas - it just doesn't run if I attempt to trigger it
right when I add the child to the parent canvas. Is there a way to get this
to work? I want my child canvases to 'zoom' into view when created.

Here's some code that tries to accomplish that. If you click on the main
canvas a blue canvas will be created and it's scale is animated ( but doesn't
work ). Clicking on the new canvas itself will also trigger the animation (
which should work ).

Thanks-

John

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Input;

namespace spiral
{

public class block_t : Canvas
{
public void zoom()
{
ScaleTransform tx = new ScaleTransform();
VisualTransform = tx;
DoubleAnimation anim = new DoubleAnimation();
anim.From = .1;
anim.To = 1;
anim.Duration = new Duration( TimeSpan.FromMilliseconds( 250 ));

tx.BeginAnimation(ScaleTransform.ScaleXProperty, anim);
tx.BeginAnimation(ScaleTransform.ScaleYProperty, anim);
}
public block_t() {
Background = Brushes.Blue;
Width = 200;
Height = 200;
}
protected override void OnMouseDown(MouseButtonEventArgs e)
{
zoom();
e.Handled = true;
}

}
public class canvas_t : Canvas
{
public canvas_t()
{
Background = Brushes.AntiqueWhite;
}
protected override void OnMouseDown(MouseButtonEventArgs e)
{
Point pt = e.GetPosition( this );
// create a new
block_t b = new block_t();
Children.Add(b);
SetTop(b, pt.Y);
SetLeft(b, pt.X);
b.zoom();
base.OnMouseDown(e);
}
}

public class app_t : Application
{
Window win;
protected override void OnStartup(StartupEventArgs e)
{
win = new Window();
win.Title = "zoom";
win.Content = new canvas_t();
win.Show();
base.OnStartup(e);
}
}

static class Program
{
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
app_t app = new app_t();
app.Run();
}
}
}

Hi John,

Just change VisualTransform = tx to RenderTransform = tx in your
zoom() function. That should do the trick.

Cheers,
szelee

On Oct 12, 1:05 am, John Dunn <jhn...@community.nospam> wrote:
> I'm attempting to animate a ScaleTransform when dynamically adding a canvas
> inside another canvas. The animation works find if begun during the MouseDown
> event of the child canvas - it just doesn't run if I attempt to trigger it
> right when I add the child to the parent canvas. Is there a way to get this
> to work? I want my child canvases to 'zoom' into view when created.
>
> Here's some code that tries to accomplish that. If you click on the main
> canvas a blue canvas will be created and it's scale is animated ( but doesn't
> work ). Clicking on the new canvas itself will also trigger the animation (
> which should work ).
>
> Thanks-
>
> John
>
> using System;
> using System.Windows;
> using System.Windows.Controls;
> using System.Windows.Media;
> using System.Windows.Media.Animation;
> using System.Windows.Input;
>
> namespace spiral
> {
>
> public class block_t : Canvas
> {
> public void zoom()
> {
> ScaleTransform tx = new ScaleTransform();
> VisualTransform = tx;
> DoubleAnimation anim = new DoubleAnimation();
> anim.From = .1;
> anim.To = 1;
> anim.Duration = new Duration( TimeSpan.FromMilliseconds( 250 ));
>
> tx.BeginAnimation(ScaleTransform.ScaleXProperty, anim);
> tx.BeginAnimation(ScaleTransform.ScaleYProperty, anim);
> }
> public block_t() {
> Background = Brushes.Blue;
> Width = 200;
> Height = 200;
> }
> protected override void OnMouseDown(MouseButtonEventArgs e)
> {
> zoom();
> e.Handled = true;
> }
>
> }
> public class canvas_t : Canvas
> {
> public canvas_t()
> {
> Background = Brushes.AntiqueWhite;
> }
> protected override void OnMouseDown(MouseButtonEventArgs e)
> {
> Point pt = e.GetPosition( this );
> // create a new
> block_t b = new block_t();
> Children.Add(b);
> SetTop(b, pt.Y);
> SetLeft(b, pt.X);
> b.zoom();
> base.OnMouseDown(e);
> }
> }
>
> public class app_t : Application
> {
> Window win;
> protected override void OnStartup(StartupEventArgs e)
> {
> win = new Window();
> win.Title = "zoom";
> win.Content = new canvas_t();
> win.Show();
> base.OnStartup(e);
> }
> }
>
> static class Program
> {
> /// <summary>
> /// The main entry point for the application.
> /// </summary>
> [STAThread]
> static void Main()
> {
> app_t app = new app_t();
> app.Run();
> }
> }
>
> }

"szelee" wrote:

> Hi John,
>
> Just change VisualTransform = tx to RenderTransform = tx in your
> zoom() function. That should do the trick.
>
> Cheers,
> szelee

Thanks - that work perfectly. Just curious, how did you happen to know that
would work? I've been faily frustrated with the SDK WinFX documentation so
far - there seems to be quite a bit of trial and error on my part trying to
get things to work properly.

Thanks for your help-

John

You're welcome. While playing with the animation stuff, I came across
this RenderTransform quite often on the documentation and books. In
fact, I do not have much idea what VisualTransform does (the msdn
description doesnt help much either). Hence I copied your code,
replaced that part and it simply works. Glad it helps


John Dunn wrote:
> "szelee" wrote:
>
> > Hi John,
> >
> > Just change VisualTransform = tx to RenderTransform = tx in your
> > zoom() function. That should do the trick.
> >
> > Cheers,
> > szelee
>
> Thanks - that work perfectly. Just curious, how did you happen to know that
> would work? I've been faily frustrated with the SDK WinFX documentation so
> far - there seems to be quite a bit of trial and error on my part trying to
> get things to work properly.
>
> Thanks for your help-
>
> John