/// <summary> /// Preloads a shape within the slide to reduce lag. Call after the animations for the shape have been created. /// </summary> public static void PreloadShape(PowerPointSlide animationSlide, PowerPoint.Shape shape, bool addCoverImage=true) { // The cover image is used to cover the screen while the preloading happens behind the cover image. PowerPoint.Shape coverImage = null; if (addCoverImage) { coverImage = shape.Duplicate()[1]; coverImage.Left = shape.Left; coverImage.Top = shape.Top; animationSlide.RemoveAnimationsForShape(coverImage); } float originalWidth = shape.Width; float originalHeight = shape.Height; float originalLeft = shape.Left; float originalTop = shape.Top; // fit the shape exactly in the screen for preloading. float scaleRatio = Math.Min(PowerPointPresentation.Current.SlideWidth / shape.Width, PowerPointPresentation.Current.SlideHeight / shape.Height); animationSlide.RelocateShapeWithoutPath(shape, 0, 0, shape.Width * scaleRatio, shape.Height * scaleRatio); var trigger = PowerPoint.MsoAnimTriggerType.msoAnimTriggerWithPrevious; var effectMotion = AddMotionAnimation(animationSlide, shape, shape.Left, shape.Top, originalLeft + (originalWidth - shape.Width) / 2, originalTop + (originalHeight - shape.Height) / 2, 0, ref trigger); var effectResize = AddResizeAnimation(animationSlide, shape, shape.Width, shape.Height, originalWidth, originalHeight, 0, ref trigger); // Make "cover" image disappear after preload. PowerPoint.Effect effectDisappear = null; if (addCoverImage) { var sequence = animationSlide.TimeLine.MainSequence; effectDisappear = sequence.AddEffect(coverImage, PowerPoint.MsoAnimEffect.msoAnimEffectFade, PowerPoint.MsoAnimateByLevel.msoAnimateLevelNone, PowerPoint.MsoAnimTriggerType.msoAnimTriggerWithPrevious); effectDisappear.Exit = Office.MsoTriState.msoTrue; effectDisappear.Timing.Duration = 0.01f; } int firstEffectIndex = animationSlide.IndexOfFirstEffect(shape); // Move the animations to just before the index of the first effect. if (effectDisappear != null) effectDisappear.MoveTo(firstEffectIndex); if (effectResize != null) effectResize.MoveTo(firstEffectIndex); if (effectMotion != null) effectMotion.MoveTo(firstEffectIndex); }