# Animate Preview

Animate Preview is a program for viewing sprite animation.
It's intended to be used in sprite development with an image and text editor.
The viewer automatically reloads the files for speedy turnaround.
[`animate`](https://github.com/jxv/animate) is the main underlying Haskell library.
It's recommend to use [`sdl2`](https://github.com/haskell-game/sdl2) and [`animate-sdl2`](https://github.com/jxv/animate-sdl2) for graphics.
An example can be found [here](https://github.com/jxv/animate-sdl2/tree/master/example).

#### [Watch the Video](https://youtu.be/9DDbeVvkcaE)

![Screenshot](https://github.com/jxv/animate-preview/blob/master/propaganda/screenshot.png)

## Try it!

Download executables: [OSX](https://github.com/jxv/animate-preview/releases/download/0.1.2/animate-preview-osx.zip) | [Ubuntu linux](https://github.com/jxv/animate-preview/releases/download/0.1.2/animate-preview-ubuntu.zip)

Download resources: [dino.png](https://github.com/jxv/animate-sdl2/blob/master/example/dino.png), [dino.yaml](https://github.com/jxv/animate-sdl2/blob/master/example/dino.yaml)

```shell
animate-preview --target /path/to/dino.yaml --image /path/to/dino.png --watch
```

[More information about the yaml file](https://github.com/jxv/animate#sprite-information)

## Usage

```
Usage: animate-preview --target STRING [--image STRING] [--high-dpi] [--fps INT]
                       [--watch]

Available options:
  -h,--help                Show this help text
  --target STRING          File path with sprite information (YAML or JSON)
  --image STRING           Force sprite sheet's file path
  --high-dpi               Use high DPI (if available)
  --fps INT                Force frames per second (default: 60)
  --watch                  Watch target and image files. Automatically reload
                           files when changed
```

## Commands

Animate Preview is mostly controlled through the keyboard.

### General

* `m`: Toggle modes - `Playback` and `Stepper`
* `r`: Reload sprite information and sprite sheet
* `escape`: Quit program

### Movement

* `j`/`down arrow`: Move sprite down
* `k`/`up arrow`: Move sprite up
* `h`/`left arrow`: Move sprite left
* `l`/`right arrow`: Move sprite right
* `mouse click` (and drag): Sprite follows mouse cursor 
* `c`: Center sprite

### Keyframe

* `n`: Next keyframe animation
* `p`: Previous keyframe animation

### Speed and Frame position

* `f`: (`Playback` Mode) Increase sprite animation speed. (`Stepper` Mode) Go to next frame.
* `d`: (`Playback` Mode) Decrease sprite animation speed. (`Stepper` Mode) Go to previous frame.
* `a`: Reset animation speed to 1x

### Scaling

* `s`/`mouse wheel click`: Reset sprite scale to 1x
* `+`/`scroll in`: Scale up sprite
* `-`/`scroll out`: Scale down sprite

### Visibility

* `t`: Iterate colors of the offset's crosshair (Red, Green, Blue, Cyan, Magenta, Yellow, None)  
* `b`: Iterate colors of the background (Gray checkered, Black checkered, White checkered)
* `o`: Iterate colors of the sprite's outline (Red, Green, Blue, Cyan, Magenta, Yellow, None)
* `i`: Toggle showing or hiding animation information


## Build

### OSX build

```
brew install sdl2
brew install sdl2_ttf
brew install sdl2_image
brew install sdl2_gfx
stack build
```

### Ubuntu build

```
sudo apt install libsdl2-dev libsdl2-ttf-dev libsdl2-image-dev libsdl2-gfx-dev
stack build
```

### Windows build

```
stack exec -- pacman -S mingw64/mingw-w64-x86_64-pkg-config mingw64/mingw-w64-x86_64-SDL2 mingw64/mingw-w64-x86_64-SDL2_ttf mingw64/mingw-w64-x86_64-SDL2_image mingw64/mingw-w64-x86_64-SDL2_gfx
stack build
```