Revision as of 02:23, 24 April 2012 by hamishwillee (Talk | contribs)

Animated Moving Ball in Qt and Windows Phone

From Nokia Developer Wiki
Jump to: navigation, search

This article demonstrates how to create an animated moving ball in Qt and WP7.

WP Metro Icon Porting.png
SignpostIcon XAML 40.png
WP Metro Icon WP8.png
SignpostIcon WP7 70px.png
Article Metadata
Code ExampleTested with
Platform(s): WP7.1, Symbian^3 OS
Windows Phone 8
Windows Phone 7.5
Platform Security
Signing Required: Self-Signed
Keywords: Animation
Created: somnathbanik (14 Apr 2014)
Last edited: hamishwillee (24 Apr 2012)



This is a very basis article for beginners to show how to create an animated moving ball in both Qt and WP7. When user clicks on the device screen the ball moves to the clicked area.

Qt Windows Phone
Animated moving ball in Qt
Animated moving ball in WP7
Example of Qt Example of WP

Note.pngNote: The animation is not clear in these images, to get the actual effect please try it on device.


Let’s create an empty project for both Qt and WP7. First we will work on Qt project and then will move on to WP7 project. We will create a circular area and when user clicks on the device screen we take the x and y coordinates of that point and change the ball position to that point with an animated behavior.

Qt Project (MainPage.qml)

We create a Rectangle with a certain radius to make it a circle.

Rectangle {
id: rectRed
width: 20; height: 20
radius: 10
color: "green"

To change the x and y coordinates of the circle in an animated manner we use SmoothedAnimation Element.

Behavior on x { SmoothedAnimation { velocity: 200 } }
Behavior on y { SmoothedAnimation { velocity: 200 } }

When user clicks on any place of the device screen we catch the x and y coordinates and update the position of the circle.

rectRed.x = mouseX
rectRed.y = mouseY

This will give a feeling of linear animated behavior of the motion of the circle.

WP7 Project (MainPage.xaml)

In WP7 we draw a Canvas and add a circle inside it using EllipseGeometry.

<EllipseGeometry x:Name="myCircle"    Center="200,100" RadiusX="15" RadiusY="15" />

We use Storyboard to animate the ball.

<Storyboard x:Name="myStoryboard"> 

When user clicks on any place of the device screen it catches the x and y coordinates of the point and updates the position of the circle.

double pointX = e.GetPosition(null).X;
double pointY = e.GetPosition(null).Y;
Point myPoint = new Point();
myPoint.X = pointX;
myPoint.Y = pointY;
myAnimation.To = myPoint;

This will give a similar animated behavior like Qt.


This article is mainly for beginners who want to have an idea about basic animation in both Qt and WP7.

Source Code

107 page views in the last 30 days.