# @ankhzet/goo
## Elegoo `.goo` file format reader/writer

## Reading from `.goo` files
```ts
// interfaces/types
import type { Goo, GooLayer, GooPreview, PrinterDefinition } from '@ankhzet/goo';
// stream helpers
import { BinaryReader, BinaryWriter } from '@ankhzet/goo';
// format encoder/decoder
import { GooWriter, GooReader } from '@ankhzet/goo';
// utils
import { layerTime, saveImage, printBuffer } from '@ankhzet/goo';

const filePath = path.resolve('./test.goo');
const binaryReader = new BinaryReader(await fs.open(filePath));
const gooReader = new GooReader(binaryReader);

const goo = await gooReader.read();

console.log(goo); // { header: { ... }, layers: [...] }

for (const { dimensions, input } of goo.header.previews) {
    // save preview image into file
    await saveImage({
        input,
        dimensions: dimensions,
        pathname: path.resolve(`./preview-${dimensions.x}x${dimensions.y}.png`),
    });
}

for (const [index, { slice }] of read.layers.entries()) {
    // save slice image into file
    await saveImage({
        input: slice,
        dimensions: goo.header.printer.resolution,
        pathname: path.resolve(`./layer-${index}.png`),
    });
}
```

## Writing to `.goo` files

```ts
const outPath = path.resolve('<path>/test.goo');
const previewPath = path.resolve('<path>/preview.png');
const slicePath = path.resolve('<path>/preview.png');

const binaryWriter = new BinaryWriter(1024 * 1024);
const gooWriter = new GooWriter(binaryWriter);
const previews = [116, 290].map((size): GooPreview => ({
    dimensions: { x: size, y: size },
    input: previewPath,
}));
const layerHeight = 0.05;
const layers: GooLayer[] = [<GooLayer>{
    slice: slicePath,
    definition: {
        pause: {
            mode: 0,
            z: 100,
        },
        z: layerHeight * 0 + layerHeight,
        exposure: 5,
        offTime: 0.1,
        times: {
            before: {
                lift: 0,
            },
            after: {
                lift: 0,
                retract: 0,
            },
        },
        motions: {
            lift: {
                first: {
                    distance: 5.0,
                    speed: 65.0,
                },
                second: {
                    distance: 0,
                    speed: 0,
                },
            },
            retract: {
                first: {
                    distance: 5.0,
                    speed: 150.0,
                },
                second: {
                    distance: 0,
                    speed: 0,
                },
            },
        },
        pwm: 255,
    },
    transform: {
        invert: false,
        translate: {
            x: 0,
            y: 0,
        },
        scale: 1.0,
        rotate: {
            angle: 0,
            origin: { x: 0, y: 0 },
        },
    },
}];
const goo = {
    header: {
        date: new Date(),
        printer: PRINTER_MARS_4_ULTRA_9K,
        layers: layers.length,
        previews,

        layerConfig: {
            bottomLayers: 1,
            transitionLayers: 1,
            thickness: 0.05,
            bottomExposure: 10,
            commonExposure: 10,
            exposureDelay: true,
            turnOffTime: 0.1,
            advance: false,
            timings: {
                bottom: {
                    before: {
                        lift: 0,
                    },
                    after: {
                        lift: 0,
                        retract: 0,
                    },
                },
                common: {
                    before: {
                        lift: 0,
                    },
                    after: {
                        lift: 0,
                        retract: 0,
                    },
                },
            },
            motions: {
                first: {
                    lift: {
                        bottom: {
                            distance: 5.0,
                            speed: 65.0,
                        },
                        common: {
                            distance: 5.0,
                            speed: 65.0,
                        },
                    },
                    retract: {
                        bottom: {
                            distance: 5.0,
                            speed: 150.0,
                        },
                        common: {
                            distance: 5.0,
                            speed: 150.0,
                        },
                    },
                },
                second: {
                    lift: {
                        common: {
                            distance: 0,
                            speed: 0,
                        },
                        bottom: {
                            distance: 0,
                            speed: 0,
                        },
                    },
                    retract: {
                        common: {
                            distance: 0,
                            speed: 0,
                        },
                        bottom: {
                            distance: 0,
                            speed: 0,
                        },
                    },
                },
            },
            pwm: {
                bottom: 255,
                common: 255,
            },
        },
        summary: {
            price: 9.99,
            currency: 'USD',
            time: layers.reduce((acc, layer) => acc + layerTime(layer), 0),
            volume: 100.0,
            weight: 100.0,
        },
    },
    layers,
};

await fs.rm(outPath, { force: true }); // remove old file
const out = await fs.open(outPath, 'w+');

try {
    await gooWriter.write(goo, (buffer) => out.write(buffer));
} finally {
    await out.close();
}
```

## Printer definitions
```ts
const PRINTER_MARS_4_ULTRA_9K: PrinterDefinition = {
    name: 'ELEGOO Mars 4 Ultra 9K',
    type: 'MSLA',
    resolution: { x: 8520, y: 4320 },
    platform: { x: 153.36, y: 77.76, z: 165 },
    mirror: { x: true, y: false },
    resinProfile: 'PCB', // unused
    grayscale: true,
    antialiasing: 4,
    blur: 2,
    gray: 5,
};
```

## Filling `Goo` structure

When constructing `Goo` instance, image fields can be either paths to the file (all formats supported by `sharp` library out of the box should be supported),
or actual image color channels data:
```ts
type ImageChannels = 1|2|3|4;
type ImageDescriptor = string | {
    buffer: Buffer;
    channels: ImageChannels;
};
```

Previews:
```ts
// this would be used for preview
const previewPath = path.resolve('<path>/preview.png');

// 116 and 290 are hardcoded in the `.goo` specification
const previews = [116, 290].map((size) => ({
    dimensions: { x: size, y: size },
    input: previewPath,
}));
```

Layers:
```ts
// images of slices themselves
const slicePaths = [
    path.resolve('<path>/layer-0.png'),
    path.resolve('<path>/layer-1.png'),
    path.resolve('<path>/layer-2.png'),
    ...
];
// depends on printer, resin, timings etc.
const layerHeight = 0.05;

// all settings in this example are tuned for a one-layer `.goo` file, used to burn PCB pattern on the photoresist
const layers = slicePaths.map((slice, index) => ({
    // slice image path
    slice,

    // all fields have documentation, with value types specified (seconds, pixels, mm etc.)
    definition: {
        pause: {
            mode: 0,
            z: 100,
        },
        z: layerHeight * index + layerHeight,
        exposure: 5,
        offTime: 0.1,
        times: {
            before: {
                lift: 0,
            },
            after: {
                lift: 0,
                retract: 0,
            },
        },
        motions: {
            lift: {
                first: {
                    distance: 5.0,
                    speed: 65.0,
                },
                second: {
                    distance: 0,
                    speed: 0,
                },
            },
            retract: {
                first: {
                    distance: 5.0,
                    speed: 150.0,
                },
                second: {
                    distance: 0,
                    speed: 0,
                },
            },
        },
        pwm: 255,
    },
    transform: {
        invert: false,
        translate: {
            x: 0,
            y: 0,
        },
        scale: 1.0,
        rotate: {
            angle: 0,
            origin: { x: 0, y: 0 },
        },
    },
}));
```

`Goo`:
```ts
const goo: Goo = {
    header: {
        date: new Date(),
        printer: PRINTER_MARS_4_ULTRA_9K,
        layers: layers.length,
        previews,

        layerConfig: {
            bottomLayers: 1,
            transitionLayers: 1,
            thickness: layerHeight,
            bottomExposure: 10,
            commonExposure: 10,
            exposureDelay: true,
            turnOffTime: 0.1,
            advance: false,
            timings: {
                bottom: {
                    before: {
                        lift: 0,
                    },
                    after: {
                        lift: 0,
                        retract: 0,
                    },
                },
                common: {
                    before: {
                        lift: 0,
                    },
                    after: {
                        lift: 0,
                        retract: 0,
                    },
                },
            },
            motions: {
                first: {
                    lift: {
                        bottom: {
                            distance: 5.0,
                            speed: 65.0,
                        },
                        common: {
                            distance: 5.0,
                            speed: 65.0,
                        },
                    },
                    retract: {
                        bottom: {
                            distance: 5.0,
                            speed: 150.0,
                        },
                        common: {
                            distance: 5.0,
                            speed: 150.0,
                        },
                    },
                },
                second: {
                    lift: {
                        common: {
                            distance: 0,
                            speed: 0,
                        },
                        bottom: {
                            distance: 0,
                            speed: 0,
                        },
                    },
                    retract: {
                        common: {
                            distance: 0,
                            speed: 0,
                        },
                        bottom: {
                            distance: 0,
                            speed: 0,
                        },
                    },
                },
            },
            pwm: {
                bottom: 255,
                common: 255,
            },
        },
        summary: {
            price: 9.99,
            currency: 'USD',
            time: layers.reduce((acc, layer) => acc + layerTime(layer), 0),
            volume: 100.0,
            weight: 100.0,
        },
    },
    layers,
};
```