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improve docs (#16)
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‎README.md‎

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# Generate FFMpeg easing and tweening strings in Laravel.
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# Tools and utilities to help generate complex strings for FFMpeg in Laravel.
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[![Latest Version on Packagist](https://img.shields.io/packagist/v/projektgopher/laravel-ffmpeg-tools.svg?style=flat-square)](https://packagist.org/packages/projektgopher/laravel-ffmpeg-tools)
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[![GitHub Tests Action Status](https://img.shields.io/github/actions/workflow/status/projektgopher/laravel-ffmpeg-tools/run-tests.yml?branch=main&label=tests&style=flat-square)](https://github.com/projektgopher/laravel-ffmpeg-tools/actions?query=workflow%3Arun-tests+branch%3Amain)
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[![GitHub Code Style Action Status](https://img.shields.io/github/actions/workflow/status/projektgopher/laravel-ffmpeg-tools/phpstan.yml?branch=main&label=code%20style&style=flat-square)](https://github.com/projektgopher/laravel-ffmpeg-tools/actions?query=workflow%3A"phpstan"+branch%3Amain)
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```
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## Usage
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- [Easing](docs/Easing.md)
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- [Expressions](docs/Expressions.md)
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- [Filters](docs/Filters.md)
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- [Filter Graphs](docs/FilterGraphs.md)
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- [Timelines and Keyframes](docs/Timelines.md)
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- [Tweening](docs/Tweening.md)
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### Using outside of a Laravel application
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For now this package can only be used within a Laravel app, but there are plans to extract the core functionality into a separate package that can be used without being bound to the framework.
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### Simple tween with delay and duration
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```php
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use ProjektGopher\FFMpegTools\Tween;
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use ProjektGopher\FFMpegTools\Timing;
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use ProjektGopher\FFMpegTools\Ease;
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$x = (new Tween())
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->from("50")
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->to("100")
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->delay(Timing::seconds(1))
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->duration(Timing::milliseconds(300))
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->ease(Ease::OutSine);
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```
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### Animation sequences using keyframes
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```php
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use ProjektGopher\FFMpegTools\Keyframe;
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use ProjektGopher\FFMpegTools\Timeline;
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use ProjektGopher\FFMpegTools\Timing;
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use ProjektGopher\FFMpegTools\Ease;
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$x = new Timeline()
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$x->keyframe((new Keyframe)
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->value('-text_w') // outside left of frame
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->hold(Timing::seconds(1))
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);
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$x->keyframe((new Keyframe)
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->value('(main_w/2)-(text_w/2)') // center
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->ease(Ease::OutElastic)
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->duration(Timing::seconds(1))
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->hold(Timing::seconds(3))
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);
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$x->keyframe((new Keyframe)
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->value('main_w') // outside right of frame
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->ease(Ease::InBack)
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->duration(Timing::seconds(1))
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);
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```
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> **Note** `new Timeline()` returns a _fluent_ api, meaning methods can be chained as well.
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## Expression Helpers
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When writing _long_ and **complicated** evaluated expressions, it can be easy to lose track of extra/missing perentheses, missing parameters, or unescaped commas. Especially when the whole expression _has_ to be on one line without any linebreaks or whitespace.
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The `Expr` class can help with this. If your expression is short enough this might be overkill, but for longer expressions this can really help with these issues.
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```diff
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+ use ProjektGopher\FFMpegTools\Utils\Expr;
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....
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- return "if(eq(({$time})\\,0)\\,0\\,if(eq(({$time})\\,1)\\,1\\,pow(2\\,-10*({$time}))*sin((({$time})*10-0.75)*{$c4})+1))";
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+ return Expr::if(
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+ x: Expr::eq($time, '0'),
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+ y: '0',
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+ z: Expr::if(
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+ x: Expr::eq($time, '1'),
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+ y: '1',
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+ z: "pow(2\\,-10*({$time}))*sin((({$time})*10-0.75)*{$c4})+1",
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+ ),
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+ );
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```
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## Docs
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Here's some more detailed information on some of this package's features:
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[Filter Graphs](docs/FilterGraphs.md)
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## Testing
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```bash
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composer test
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```
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### Visual Snapshot Testing
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#### Easing
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To generate plots of all `Ease` methods, from the project root, run
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```bash
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./scripts/generateEasings
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```
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The 256x256 PNGs will be generated in the `tests/Snapshots/Easings` directory.
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These snapshots will be ignored by git, but allow visual inspection of the plots to
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compare against known good sources, like [Easings.net](https://easings.net).
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#### Timelines
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To generate a video using a `Timeline` with `Keyframes`, from the project root, run
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```bash
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./scripts/generateTimeline
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```
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The 256x256 MP4 will be generated in the `tests/Snapshots/Timelines` directory.
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These snapshots will also be ignored by git, but again allow for a visual
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inspection to ensure they match the expected output.
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> **Note** The `scripts` directory _may_ need to have its permissions changed to allow script execution
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```bash
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chmod -R 777 ./scripts
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```
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- [Instructions](docs/Testing.md)
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## Changelog
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Please see [CHANGELOG](CHANGELOG.md) for more information on what has changed recently.
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Please see [RELEASES](releases) for more information on what has changed recently.
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## Contributing
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Please see [CONTRIBUTING](CONTRIBUTING.md) for details.

‎docs/Easing.md‎

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# Easing

‎docs/Expressions.md‎

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# Expression Helpers
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When writing _long_ and **complicated** evaluated expressions, it can be easy to lose track of extra/missing perentheses, missing parameters, or unescaped commas. Especially when the whole expression _has_ to be on one line without any linebreaks or whitespace.
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The `Expr` class can help with this. If your expression is short enough this might be overkill, but for longer expressions this can really help with these issues. The named arguments aren't strictly necessary, but can help keep things more obviously in-line with the provided documentation which has been ported directly from the FFMpeg documentation.
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> **note** Currently only the `eq`, `gt`, `if`, and `lt`, have been implemented.
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## Example Diff
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```diff
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+ use ProjektGopher\FFMpegTools\Utils\Expr;
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....
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- return "if(eq(({$time})\\,0)\\,0\\,if(eq(({$time})\\,1)\\,1\\,pow(2\\,-10*({$time}))*sin((({$time})*10-0.75)*{$c4})+1))";
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+ return Expr::if(
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+ x: Expr::eq($time, '0'),
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+ y: '0',
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+ z: Expr::if(
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+ x: Expr::eq($time, '1'),
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+ y: '1',
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+ z: "pow(2\\,-10*({$time}))*sin((({$time})*10-0.75)*{$c4})+1",
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+ ),
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+ );
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```

‎docs/Filters.md‎

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# Filters

‎docs/Testing.md‎

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## Testing
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```bash
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composer test
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```
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### Visual Snapshot Testing
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#### Easing
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To generate plots of all `Ease` methods, from the project root, run
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```bash
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./scripts/generateEasings
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```
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The 256x256 PNGs will be generated in the `tests/Snapshots/Easings` directory.
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These snapshots will be ignored by git, but allow visual inspection of the plots to
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compare against known good sources, like [Easings.net](https://easings.net).
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#### Timelines
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To generate a video using a `Timeline` with `Keyframes`, from the project root, run
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```bash
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./scripts/generateTimeline
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```
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The 256x256 MP4 will be generated in the `tests/Snapshots/Timelines` directory.
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These snapshots will also be ignored by git, but again allow for a visual
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inspection to ensure they match the expected output.
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> **Note** The `scripts` directory _may_ need to have its permissions changed to allow script execution
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```bash
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chmod -R 777 ./scripts
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```

‎docs/Timelines.md‎

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# Timelines and Keyframes
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## Animation sequences using keyframes
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```php
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use ProjektGopher\FFMpegTools\Keyframe;
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use ProjektGopher\FFMpegTools\Timeline;
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use ProjektGopher\FFMpegTools\Timing;
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use ProjektGopher\FFMpegTools\Ease;
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$x = new Timeline()
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$x->keyframe((new Keyframe)
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->value('-text_w') // outside left of frame
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->hold(Timing::seconds(1))
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);
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$x->keyframe((new Keyframe)
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->value('(main_w/2)-(text_w/2)') // center
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->ease(Ease::OutElastic)
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->duration(Timing::seconds(1))
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->hold(Timing::seconds(3))
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);
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$x->keyframe((new Keyframe)
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->value('main_w') // outside right of frame
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->ease(Ease::InBack)
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->duration(Timing::seconds(1))
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);
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```
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> **Note** `new Timeline()` returns a _fluent_ api, meaning methods can be chained as well.

‎docs/Tweening.md‎

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# Tweening
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## Simple tween with delay and duration
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```php
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use ProjektGopher\FFMpegTools\Tween;
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use ProjektGopher\FFMpegTools\Timing;
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use ProjektGopher\FFMpegTools\Ease;
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$x = (new Tween())
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->from("50")
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->to("100")
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->delay(Timing::seconds(1))
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->duration(Timing::milliseconds(300))
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->ease(Ease::OutSine);
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```

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