Moving an image WinForms VS WPF

Amit Ziv

Hi, im currently converting one of my projects from winforms to wpf.
i had this line of code in winforms (greenCar is picturebox control):
int speed = 5

greenCar.Top = greenCar.Top + speed;

basically im trying to move the picture downwards in each tick of the timer which this function running in.

what code line is doing the same thing in WPF application?
thanks in advance :)

3 Replies

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Vulpes12y ago
Accepted answer
Well, the equivalent of a PictureBox in WPF is the Image control and the equivalent of the System.Windows.Forms.Timer is the System.Windows.Threading.DispatcherTimer.

So the corresponding code in WPF would be something like this:

using System.Windows.Threading;

// ...

public partial class MainWindow : Window
{
private DispatcherTimer timer;

public MainWindow()
{
InitializeComponent();
timer = new System.Windows.Threading.DispatcherTimer();
timer.Tick += timer_Tick;
timer.Interval = TimeSpan.FromSeconds(0.5);
timer.Start();
}

private void timer_Tick(object sender, EventArgs e)
{
int speed = 5;
Thickness th = greenCar.Margin;
th.Top += speed;
greenCar.Margin = th;
}

private void button1_Click(object sender, RoutedEventArgs e)
{
timer.Stop();
}
}
Vulpes12y ago
Well you'd certainly expect graphics performance under WPF to be better than under WF.

This is because the latter uses GDI+ as its underlying graphics engine but the former uses the more modern and powerful DirectX.

However, things are not so simple in practice and you may like to read this article contrasting the relative performance of the two:

http://kynosarges.org/WpfPerformance.html

It seems that you can improve WPF graphics performance considerably by turning off anti-aliasing which is the default.

Frankly, I've never bothered to do this myself but I don't write games and like to keep my UIs relatively simple. In fact, for the sort of desktop applications I write I can't say I've noticed much performance difference between WPF and WF at all.
Amit Ziv12y ago
Thanks a lot :) btw, is there any diffrence between graphics permormance on winform and on WPF? any tips to avoid laggy graphics?