Add Flip Art app specification Resolves: N/a See also: N/afeature/flip-art-app
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# Flip Art
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**Tier:** 2-Intermediate
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Many developers have found that adding animation to an application is a
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useful technique add impact to the UI, to make it more appealing to its users,
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and to explain complex subject matter. But, as a developer how do you create
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these and how do you know what images make effective animations?
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The objective of the Flip Art app is to address both of these needs by
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providing a simple way to collect and arrange a set of images into an
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animated sequence that can be replayed and adjusted to achieve the desired
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impact and effect.
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### Requirements & Constraints
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Developers should not rely on animation or graphics libraries to implement
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this app. Instead, try using vanilla Javascript, CSS, and HTML.
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## User Stories
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- [ ] User can see the following primary components in the app window:
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- Configuration panel containing elements used to tailor the animation
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process.
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- Operation buttons
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- Animation display panel animations will be presented in
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### Configuration Panel
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- [ ] User can see eight thumbnails that will contain individual animation
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frames
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- [ ] User can see a button under each thumbnail - '+'
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- [ ] User can click the '+' button to add a new image to an empty thumbnail
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- [ ] User can see a file open dialog when the '+' button is clicked to
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allow an `.jpg` image to be loaded into the thumbnail.
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- [ ] User can see the '+' button label change to '-' after a thumbnail is
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loaded.
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- [ ] User can click the '-' button to remove or replace a thumbnail.
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- [ ] User can see an 'Transition Speed' slider control.
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- [ ] User can adjust the 'Transition Speed' slider from slow to fast to
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adjust the transition time between thumbnails in the Animation Display.
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### Operation Buttons
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- [ ] User can see two buttons - 'Clear Configuration' and 'Start Animation'
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- [ ] User can see the 'Start Animation' button disabled until at least one
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thumbnail has been added via the Configuration Panel.
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- [ ] User can click the 'Clear Configuration' button to clear all thumbnails
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from the configuration panel.
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- [ ] User can click the 'Start Animation' button to begin the Animation
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Display panel
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- [ ] User can see the 'Start Animation' button label change to 'Stop
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Animation' once an animation has been started.
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- [ ] User can click the 'Stop Animation' button to halt the animation in
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the animation display
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- [ ] User can see the 'Stop Animation' button label change to 'Start
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Animation' when an animation has been stopped.
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### Animation Display Panel
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- [ ] User can see thumbnails added in the Configuration panel displayed
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when theh 'Start Animation' button is clicked.
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- [ ] User can see thumbnails transtion from one to the next at the rate
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defined by the 'Transition Speed' slider.
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## Bonus features
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- [ ] User can see the border around the thumbnail in the Configuration Panel
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highlighted when that thumbnail is displayed in the Animation Display panel.
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- [ ] User can dynamically add any number of thumbnails rather than being
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restricted to just eight.
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- [ ] User can hear unique sounds associated with modifying thumbnails in the
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Configuration Panel.
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- [ ] User can see a transition type dropdown in the Configuration Panel to
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define the transition effect between thumbnails in the Animation Display -
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ease, ease-in, ease-out, ease-in-out
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- [ ] User can drag and drop thumbnails to reorder them
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- [ ] User can save the animation as a `.gif` file.
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## Useful links and resources
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- [How to Make Flip Book Animation](https://www.youtube.com/watch?v=Njl-uqnmBGA)
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- [CSS Animation (MDN)](https://developer.mozilla.org/en-US/docs/Web/CSS/animation)
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- [Using CSS Transitions (MDN)](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Transitions/Using_CSS_transitions)
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- [CSS Transition (MDN)](https://developer.mozilla.org/en-US/docs/Web/CSS/transition)
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## Example projects
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[FlipAnim](http://flipanim.com/)
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