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// { header: { ... }, layers: [...] }\n\nfor (const { dimensions, input } of goo.header.previews) {\n    // save preview image into file\n    await saveImage({\n        input,\n        dimensions: dimensions,\n        pathname: path.resolve(`./preview-${dimensions.x}x${dimensions.y}.png`),\n    });\n}\n\nfor (const [index, { slice }] of read.layers.entries()) {\n    // save slice image into file\n    await saveImage({\n        input: slice,\n        dimensions: goo.header.printer.resolution,\n        pathname: path.resolve(`./layer-${index}.png`),\n    });\n}\n```\n\n## Writing to `.goo` files\n\n```ts\nconst outPath = path.resolve('<path>/test.goo');\nconst previewPath = path.resolve('<path>/preview.png');\nconst slicePath = path.resolve('<path>/preview.png');\n\nconst binaryWriter = new BinaryWriter(1024 * 1024);\nconst gooWriter = new GooWriter(binaryWriter);\nconst previews = [116, 290].map((size): GooPreview => ({\n    dimensions: { x: size, y: size },\n    input: previewPath,\n}));\nconst layerHeight = 0.05;\nconst layers: GooLayer[] = [<GooLayer>{\n    slice: slicePath,\n    definition: {\n        pause: {\n            mode: 0,\n            z: 100,\n        },\n        z: layerHeight * 0 + layerHeight,\n        exposure: 5,\n        offTime: 0.1,\n        times: {\n            before: {\n                lift: 0,\n            },\n            after: {\n                lift: 0,\n                retract: 0,\n            },\n        },\n        motions: {\n            lift: {\n                first: {\n                    distance: 5.0,\n                    speed: 65.0,\n                },\n                second: {\n                    distance: 0,\n                    speed: 0,\n                },\n            },\n            retract: {\n                first: {\n                    distance: 5.0,\n                    speed: 150.0,\n                },\n                second: {\n                    distance: 0,\n                    speed: 0,\n                },\n            },\n        },\n        pwm: 255,\n    },\n    transform: {\n        invert: false,\n        translate: {\n            x: 0,\n            y: 0,\n        },\n        scale: 1.0,\n        rotate: {\n            angle: 0,\n            origin: { x: 0, y: 0 },\n        },\n    },\n}];\nconst goo = {\n    header: {\n        date: new Date(),\n        printer: PRINTER_MARS_4_ULTRA_9K,\n        layers: layers.length,\n        previews,\n\n        layerConfig: {\n            bottomLayers: 1,\n            transitionLayers: 1,\n            thickness: 0.05,\n            bottomExposure: 10,\n            commonExposure: 10,\n            exposureDelay: true,\n            turnOffTime: 0.1,\n            advance: false,\n            timings: {\n                bottom: {\n                    before: {\n                        lift: 0,\n                    },\n                    after: {\n                        lift: 0,\n                        retract: 0,\n                    },\n                },\n                common: {\n                    before: {\n                        lift: 0,\n                    },\n                    after: {\n                        lift: 0,\n                        retract: 0,\n                    },\n                },\n            },\n            motions: {\n                first: {\n                    lift: {\n                        bottom: {\n                            distance: 5.0,\n                            speed: 65.0,\n                        },\n                        common: {\n                            distance: 5.0,\n                            speed: 65.0,\n                        },\n                    },\n                    retract: {\n                        bottom: {\n                            distance: 5.0,\n                            speed: 150.0,\n                        },\n                        common: {\n                            distance: 5.0,\n                            speed: 150.0,\n                        },\n                    },\n                },\n                second: {\n                    lift: {\n                        common: {\n                            distance: 0,\n                            speed: 0,\n                        },\n                        bottom: {\n                            distance: 0,\n                            speed: 0,\n                        },\n                    },\n                    retract: {\n                        common: {\n                            distance: 0,\n                            speed: 0,\n                        },\n                        bottom: {\n                            distance: 0,\n                            speed: 0,\n                        },\n                    },\n                },\n            },\n            pwm: {\n                bottom: 255,\n                common: 255,\n            },\n        },\n        summary: {\n            price: 9.99,\n            currency: 'USD',\n            time: layers.reduce((acc, layer) => acc + layerTime(layer), 0),\n            volume: 100.0,\n            weight: 100.0,\n        },\n    },\n    layers,\n};\n\nawait fs.rm(outPath, { force: true }); // remove old file\nconst out = await fs.open(outPath, 'w+');\n\ntry {\n    await gooWriter.write(goo, (buffer) => out.write(buffer));\n} finally {\n    await out.close();\n}\n```\n\n## Printer definitions\n```ts\nconst PRINTER_MARS_4_ULTRA_9K: PrinterDefinition = {\n    name: 'ELEGOO Mars 4 Ultra 9K',\n    type: 'MSLA',\n    resolution: { x: 8520, y: 4320 },\n    platform: { x: 153.36, y: 77.76, z: 165 },\n    mirror: { x: true, y: false },\n    resinProfile: 'PCB', // unused\n    grayscale: true,\n    antialiasing: 4,\n    blur: 2,\n    gray: 5,\n};\n```\n\n## Filling `Goo` structure\n\nWhen 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),\nor actual image color channels data:\n```ts\ntype ImageChannels = 1|2|3|4;\ntype ImageDescriptor = string | {\n    buffer: Buffer;\n    channels: ImageChannels;\n};\n```\n\nPreviews:\n```ts\n// this would be used for preview\nconst previewPath = path.resolve('<path>/preview.png');\n\n// 116 and 290 are hardcoded in the `.goo` specification\nconst previews = [116, 290].map((size) => ({\n    dimensions: { x: size, y: size },\n    input: previewPath,\n}));\n```\n\nLayers:\n```ts\n// images of slices themselves\nconst slicePaths = [\n    path.resolve('<path>/layer-0.png'),\n    path.resolve('<path>/layer-1.png'),\n    path.resolve('<path>/layer-2.png'),\n    ...\n];\n// depends on printer, resin, timings etc.\nconst layerHeight = 0.05;\n\n// all settings in this example are tuned for a one-layer `.goo` file, used to burn PCB pattern on the photoresist\nconst layers = slicePaths.map((slice, index) => ({\n    // slice image path\n    slice,\n\n    // all fields have documentation, with value types specified (seconds, pixels, mm etc.)\n    definition: {\n        pause: {\n            mode: 0,\n            z: 100,\n        },\n        z: layerHeight * index + layerHeight,\n        exposure: 5,\n        offTime: 0.1,\n        times: {\n            before: {\n                lift: 0,\n            },\n            after: {\n                lift: 0,\n                retract: 0,\n            },\n        },\n        motions: {\n            lift: {\n                first: {\n                    distance: 5.0,\n                    speed: 65.0,\n                },\n                second: {\n                    distance: 0,\n                    speed: 0,\n                },\n            },\n            retract: {\n                first: {\n                    distance: 5.0,\n                    speed: 150.0,\n                },\n                second: {\n                    distance: 0,\n                    speed: 0,\n                },\n            },\n        },\n        pwm: 255,\n    },\n    transform: {\n        invert: false,\n        translate: {\n            x: 0,\n            y: 0,\n        },\n        scale: 1.0,\n        rotate: {\n            angle: 0,\n            origin: { x: 0, y: 0 },\n        },\n    },\n}));\n```\n\n`Goo`:\n```ts\nconst goo: Goo = {\n    header: {\n        date: new Date(),\n        printer: PRINTER_MARS_4_ULTRA_9K,\n        layers: layers.length,\n        previews,\n\n        layerConfig: {\n            bottomLayers: 1,\n            transitionLayers: 1,\n            thickness: layerHeight,\n            bottomExposure: 10,\n            commonExposure: 10,\n            exposureDelay: true,\n            turnOffTime: 0.1,\n            advance: false,\n            timings: {\n                bottom: {\n                    before: {\n                        lift: 0,\n                    },\n                    after: {\n                        lift: 0,\n                        retract: 0,\n                    },\n                },\n                common: {\n                    before: {\n                        lift: 0,\n                    },\n                    after: {\n                        lift: 0,\n                        retract: 0,\n                    },\n                },\n            },\n            motions: {\n                first: {\n                    lift: {\n                        bottom: {\n                            distance: 5.0,\n                            speed: 65.0,\n                        },\n                        common: {\n                            distance: 5.0,\n                            speed: 65.0,\n                        },\n                    },\n                    retract: {\n                        bottom: {\n                            distance: 5.0,\n                            speed: 150.0,\n                        },\n                        common: {\n                            distance: 5.0,\n                            speed: 150.0,\n                        },\n                    },\n                },\n                second: {\n                    lift: {\n                        common: {\n                            distance: 0,\n                            speed: 0,\n                        },\n                        bottom: {\n                            distance: 0,\n                            speed: 0,\n                        },\n                    },\n                    retract: {\n                        common: {\n                            distance: 0,\n                            speed: 0,\n                        },\n                        bottom: {\n                            distance: 0,\n                            speed: 0,\n                        },\n                    },\n                },\n            },\n            pwm: {\n                bottom: 255,\n                common: 255,\n            },\n        },\n        summary: {\n            price: 9.99,\n            currency: 'USD',\n            time: layers.reduce((acc, layer) => acc + layerTime(layer), 0),\n            volume: 100.0,\n            weight: 100.0,\n        },\n    },\n    layers,\n};\n```\n","readmeFilename":"README.md"}