Manage Slide Transitions in Presentations Using Python

Overview

Aspose.Slides for Python provides full control over slide transitions, from selecting a transition type to configuring timing and triggers as part of automated presentation workflows. You can set slides to advance on click and/or after a specified delay and refine visual behavior with effects such as cuts from black or directional entrances. The library also supports the Morph transition introduced in PowerPoint 2019, including modes that morph by object, word, or character to create smooth, cohesive motion between slides.

Add Slide Transitions

To make this easier to understand, this example demonstrates how to use Aspose.Slides for Python to manage simple slide transitions. Developers can apply different slide transition effects to slides and customize their behavior. To create a simple slide transition, follow these steps:

  1. Create an instance of the Presentation class.
  2. Apply a slide transition using one of the effects from the TransitionType enum.
  3. Save the modified presentation file.
import aspose.slides as slides

# Instantiate the Presentation class to load a presentation file.
with slides.Presentation("sample.pptx") as presentation:
    # Apply a circle transition to slide 1.
    presentation.slides[0].slide_show_transition.type = slides.slideshow.TransitionType.CIRCLE

    # Apply a comb transition to slide 2.
    presentation.slides[1].slide_show_transition.type = slides.slideshow.TransitionType.COMB

    # Save the presentation to disk.
    presentation.save("output.pptx", slides.export.SaveFormat.PPTX)

Add Advanced Slide Transitions

In this section, we applied a simple transition effect to a slide. To make that effect more controlled and polished, follow these steps:

  1. Create an instance of the Presentation class.
  2. Apply a slide transition using one of the effects from the TransitionType enum.
  3. Configure the transition to Advance On Click, after a specific time period, or both.
  4. Save the modified presentation file.

If Advance On Click is enabled, the slide advances only when the user clicks. If the Advance After Time property is set, the slide advances automatically after the specified interval.

import aspose.slides as slides

# Instantiate the Presentation class to open a presentation file.
with slides.Presentation("sample.pptx") as presentation:
    slide0 = presentation.slides[0]

    # Apply a circle transition to slide 1.
    slide0.slide_show_transition.type = slides.slideshow.TransitionType.CIRCLE

    # Enable advance on click and set a 3-second auto-advance.
    slide0.slide_show_transition.advance_on_click = True
    slide0.slide_show_transition.advance_after_time = 3000

    slide1 = presentation.slides[1]

    # Apply a comb transition to slide 2.
    slide1.slide_show_transition.type = slides.slideshow.TransitionType.COMB

    # Enable advance on click and set a 5-second auto-advance.
    slide1.slide_show_transition.advance_on_click = True
    slide1.slide_show_transition.advance_after_time = 5000

    slide2 = presentation.slides[2]

    # Apply a zoom transition to slide 3.
    slide2.slide_show_transition.type = slides.slideshow.TransitionType.ZOOM

    # Enable advance on click and set a 7-second auto-advance.
    slide2.slide_show_transition.advance_on_click = True
    slide2.slide_show_transition.advance_after_time = 7000

    # Save the presentation to disk.
    presentation.save("output.pptx", slides.export.SaveFormat.PPTX)

Morph Transition

Aspose.Slides for Python supports the Morph transition, which animates the smooth movement from one slide to the next. This section explains how to use the Morph transition. To use it effectively, you need two slides with at least one object in common. The easiest approach is to duplicate a slide and then move the object to a different position on the second slide.

The following code snippet shows how to clone a slide that contains text and apply a Morph transition to the second slide.

import aspose.slides as slides

with slides.Presentation() as presentation:
    slide0 = presentation.slides[0]

    auto_shape = slide0.shapes.add_auto_shape(slides.ShapeType.RECTANGLE, 100, 100, 400, 100)
    auto_shape.text_frame.text = "Morph Transition in PowerPoint Presentations"

    # Clone the first slide to create a second slide with the same shapes for Morph continuity.
    slide1 = presentation.slides.add_clone(slide0)

    # Select the same rectangle on the second slide and change its position and size.
    shape = slide1.shapes[0]
    shape.x += 100
    shape.y += 50
    shape.width -= 200
    shape.height -= 10

    # Enable the Morph transition on the second slide to animate the shape changes smoothly.
    slide1.slide_show_transition.type = slides.slideshow.TransitionType.MORPH

    presentation.save("output.pptx", slides.export.SaveFormat.PPTX)

Morph Transition Types

The TransitionMorphType enum represents the different types of Morph slide transitions.

The following code snippet shows how to apply a Morph transition to a slide and change the morph type:

import aspose.slides as slides

with slides.Presentation("sample.pptx") as presentation:
    slide = presentation.slides[0]

    slide.slide_show_transition.type = slides.slideshow.TransitionType.MORPH
    slide.slide_show_transition.value.morph_type = slides.slideshow.TransitionMorphType.BY_WORD
    
    presentation.save("output.pptx", slides.export.SaveFormat.PPTX)

Set Transition Effects

Aspose.Slides for Python lets you set transition effects such as From Black, From Left, From Right, etc. To configure a transition effect, follow these steps:

  1. Create an instance of the Presentation class.
  2. Get a reference to the slide.
  3. Set the desired transition effect.
  4. Save the presentation as a PPTX file.

In the example below, we set several transition effects.

import aspose.slides as slides

# Instantiate the Presentation class to open a presentation file.
with slides.Presentation("sample.pptx") as presentation:
    slide = presentation.slides[0]

    # Apply a Cut transition and enable From Black.
    slide.slide_show_transition.type = slides.slideshow.TransitionType.CUT
    slide.slide_show_transition.value.from_black = True

    # Save the presentation to disk.
    presentation.save("output.pptx", slides.export.SaveFormat.PPTX)
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