WPF rotate an loading image for gif effect

Question

I have a static loader image in wpf, I can easily use it as a loading gif by using WPFAnimatedGIF nuget package, but it seems like an overkill.

There is only one sce

Answer 1

This Style animates the Angle of a RotateTransform in 30 degree steps when the Image element is visible.

...

---

In order to avoid using an animation with many DiscreteDoubleKeyFrames, you may derive from DoubleAnimation and add a Step property:

public class DoubleAnimationWithSteps : DoubleAnimation
{
    public static readonly DependencyProperty StepProperty = DependencyProperty.Register(
        nameof(Step), typeof(double), typeof(DoubleAnimationWithSteps));

    public double Step
    {
        get { return (double)GetValue(StepProperty); }
        set { SetValue(StepProperty, value); }
    }

    protected override double GetCurrentValueCore(
        double from, double to, AnimationClock animationClock)
    {
        var value = base.GetCurrentValueCore(from, to, animationClock);

        if (Step > 0d)
        {
            value = Step * Math.Floor(value / Step);
        }

        return value;
    }

    protected override Freezable CreateInstanceCore()
    {
        return new DoubleAnimationWithSteps();
    }
}

You would use it like this: