Rectangle rotate once at MouseRightButtonDown

Question

Hi all,

I need your help with this issue i have been struggling for the past days. I want to rotate a rectangle at an angle of 30° everytime i press the rightClickButton.

It works fine when i click once on the rightClickButton.But when i want to click again it doesnt rotate anymore.

It's the same behavior with MouseButtonEventHandler or without.

Can you guys help me ??

Thanks in advance.

private void Rectangle_MouseRightButtonDown(object sender, MouseButtonEventArgs e)
{
MouseButtonEventHandlerRightClick(sender, e);
}
private void MouseButtonEventHandlerRightClick(object sender, MouseButtonEventArgs e)
{
element = (Rectangle)sender;
if (Mouse.RightButton == MouseButtonState.Pressed)
{
Console.WriteLine("has cliqued right");
anc_width = element.Width;
anc_height = element.Height;
i += 1;
Console.WriteLine("before transform of guantanamera");
double angle = 30;
RotateTransform rotateTransform2 = new RotateTransform(angle);
rotateTransform2.CenterX = element.Width / 2;
rotateTransform2.CenterY = element.Height / 2;
// Console.WriteLine(element.Width / 2 + " toto "+ element.Height/2);
element.RenderTransform = rotateTransform2;
/* Canvas.SetLeft(element, Canvas.GetLeft(element)+40);
Canvas.SetTop(element, Canvas.GetTop(element));*/
}
else
{
Console.WriteLine("Releasing Element");
element = null;
}
}

Dipa Mehta · Answer

You are always setting the same angle of 30°, while you should actually add 30° to the current value of the Angle property of an already existing RotateTransform. Besides that, it's also unnecessary to set the transform's center. Set the element's RenderTransformOrigin property instead. var rotateTransform = element.RenderTransform as RotateTransform; if (rotateTransform == null) { rotateTransform = new RotateTransform(); element.RenderTransform = rotateTransform; element.RenderTransformOrigin = new Point(0.5, 0.5); } rotateTransform.Angle += 30; You may also consider setting the transform in advance in XAML: