| public Calculate ( double t, double b, double c, double d ) : double | ||
| t | double | Elapsed time. |
| b | double | Starting value. |
| c | double | Delta change from start to ending value. |
| d | double | Total duration. |
| return | double | |
/// <summary>
/// Perform animation effects on the set of children.
/// </summary>
/// <param name="animateId">Identifier of the animate to be used.</param>
/// <param name="metaPanel">Reference to owning panel instance.</param>
/// <param name="stateDict">Dictionary of per-element state.</param>
/// <param name="elements">Collection of elements to be animated.</param>
/// <param name="elapsedMilliseconds">Elapsed milliseconds since last animation cycle.</param>
/// <param name="startOpacity">Opacity for start of animation.</param>
/// <param name="endOpacity">Opacity for end of animation.</param>
public void ApplyAnimation(string animateId,
MetaPanelBase metaPanel,
MetaElementStateDict stateDict,
ICollection elements,
double elapsedMilliseconds,
double startOpacity,
double endOpacity)
{
// Only apply if we match the incoming animate identifier
if (string.IsNullOrEmpty(Id) || Id.Equals(animateId))
{
// Only grab the dependancy properties once, for improved perf
double duration = Duration;
foreach (UIElement element in elements)
{
// Only apply animation to element of required target state
MetaElementState elementState = stateDict[element];
if (elementState.Status == Target)
{
// If the element is the correct target and correct status for starting animation
if ((!elementState.RemoveCalculated && (Target == MetaElementStatus.Removing)) ||
(elementState.NewCalculating && (Target == MetaElementStatus.New)))
{
// Use the starting opacity
element.Opacity = startOpacity;
elementState.ElapsedOpacityTime = 0;
}
else
{
// Only perform animation if some time has actually ellapsed and not already at target
if ((elapsedMilliseconds > 0) && (element.Opacity != (double)endOpacity))
{
// Add new elapsed time to the animation running time
elementState.ElapsedOpacityTime += elapsedMilliseconds;
// Does elapsed time indicate animation should have completed?
if (elementState.ElapsedOpacityTime >= duration)
{
element.Opacity = endOpacity;
}
else
{
element.Opacity = EasingCalculation.Calculate(elementState.ElapsedOpacityTime, startOpacity, endOpacity - startOpacity, duration);
}
}
}
// If not yet at target opacity then not finished with animating
elementState.AnimateComplete &= (element.Opacity == (double)endOpacity);
}
}
}
}
/// <summary>
/// Perform animation effects on the set of children.
/// </summary>
/// <param name="animateId">Identifier of the animate to be used.</param>
/// <param name="metaPanel">Reference to owning panel instance.</param>
/// <param name="stateDict">Dictionary of per-element state.</param>
/// <param name="elements">Collection of elements to be animated.</param>
/// <param name="elapsedMilliseconds">Elapsed milliseconds since last animation cycle.</param>
public override void ApplyAnimation(string animateId,
MetaPanelBase metaPanel,
MetaElementStateDict stateDict,
ICollection elements,
double elapsedMilliseconds)
{
// Only apply if we match the incoming animate identifier
if (string.IsNullOrEmpty(Id) || Id.Equals(animateId))
{
// Update the easing equation with latest value
EasingCalculation.Easing = Easing;
// Cache dependancy properties for faster perf
double duration = Math.Max((double)1, Duration);
foreach (UIElement element in elements)
{
// Only apply animation to element of required target state
MetaElementState elementState = stateDict[element];
if (elementState.Status == Target)
{
Rect targetRect = elementState.TargetRect;
Rect currentRect = (elementState.CurrentRect.IsEmpty ? targetRect : elementState.CurrentRect);
// If start of animation....
if (elementState.TargetChanged)
{
// Cache starting information
elementState.StartRect = currentRect;
elementState.ElapsedBoundsTime = 0;
}
else
{
// Only perform animation if some time has actually ellapsed and not already at target
if ((elapsedMilliseconds > 0) && !currentRect.Equals(targetRect))
{
// Add new elapsed time to the animation running time
elementState.ElapsedBoundsTime += elapsedMilliseconds;
// Does elapsed time indicate animation should have completed?
if (elementState.ElapsedBoundsTime >= duration)
{
currentRect = targetRect;
}
else
{
Rect startRect = elementState.StartRect;
double elapsedTime = elementState.ElapsedBoundsTime;
// Using animation easing to discover new target rectangle corners
double left = EasingCalculation.Calculate(elapsedTime, startRect.X, targetRect.X - startRect.X, duration);
double top = EasingCalculation.Calculate(elapsedTime, startRect.Y, targetRect.Y - startRect.Y, duration);
double bottom = EasingCalculation.Calculate(elapsedTime, startRect.Bottom, targetRect.Bottom - startRect.Bottom, duration);
double right = EasingCalculation.Calculate(elapsedTime, startRect.Right, targetRect.Right - startRect.Right, duration);
// Normalize edges left/right edges
if (left > right)
{
elapsedTime = left;
left = right;
right = elapsedTime;
}
// Normalize edges top/bottom edges
if (top > bottom)
{
elapsedTime = top;
top = bottom;
bottom = elapsedTime;
}
currentRect = new Rect(left, top, right - left, bottom - top);
}
}
}
// Put back the updated rectangle and decide if more animation is needed
elementState.CurrentRect = currentRect;
elementState.AnimateComplete &= (currentRect.Equals(targetRect));
}
}
}
}
