public bool AnimateRenderPosition(bool isAnimating, DateTime utcNow, float animationSpeed)
{
if (IsVisible)
{
if (isAnimating && animationTargetPosition != MathHelper.PositiveInfinityVector2)
{
if (animationTargetPosition != targetLayoutPosition)
{
animatingEndUtc = utcNow.AddMilliseconds(animationSpeed);
}
}
else
{
animatingEndUtc = null;
}
animationTargetPosition = targetLayoutPosition;
float fractionComplete = 1;
if (animatingEndUtc.HasValue)
{
var timeRemaining = (float)(animatingEndUtc.Value - utcNow).TotalMilliseconds;
fractionComplete -= Math.Min(1, Math.Max(0, timeRemaining / animationSpeed));
}
UpdatePosition(
new Vector2(
MathHelper.Interpolate(fractionComplete, RenderPosition.X, targetLayoutPosition.X),
MathHelper.Interpolate(fractionComplete, RenderPosition.Y, targetLayoutPosition.Y)));
return(!MathHelper.AboutEqual(targetLayoutPosition, RenderPosition));
}
animationTargetPosition = MathHelper.PositiveInfinityVector2;
return(false);
}
public void AboutEquals_Vector2_ByEpsilon_ReturnsTrue()
{
Vector2 v = new Vector2(10, 50);
Assert.True(MathHelper.AboutEqual(v, v + new Vector2(float.Epsilon, float.Epsilon)));
}
public void AboutEquals_Double_ByEpsilon_ReturnsTrue()
{
double v = 10;
Assert.True(MathHelper.AboutEqual(v, v + double.Epsilon));
}
public void AboutEquals_Float_ByEpsilon_ReturnsTrue()
{
float v = 10;
Assert.True(MathHelper.AboutEqual(v, v + float.Epsilon));
}