Viewport placement

import {
  placeDrawing,
  viewportTransform,
  inverseViewportTransform,
  fitTransform,
  fitViewportScale,
  viewCenterOf,
  viewSourceToDrawingRequest,
  modelToPaper,
} from '@opengeometry/floorkit';

function placeDrawing(
  drawing: VectorDrawing,
  viewport: Viewport,
  policy?: SheetPolicy,
): PlacedDrawing;

function viewportTransform(drawing: VectorDrawing, viewport: Viewport): (point: Point2) => Point2;

function inverseViewportTransform(
  drawing: VectorDrawing,
  viewport: Viewport,
): (paper: Point2) => Point2;

function fitTransform(
  viewport: FitViewport,
  pageMm: {
    width: number;
    height: number;
  },
  { pixelsPerMm, padding, minScale, maxScale }: FitOptions,
): FitTransform | null;

function fitViewportScale(
  drawing: VectorDrawing,
  frame: Viewport['frame'],
  options?: {
    paddingMm?: number;
    system?: UnitSystem;
  },
): {
  scale: number;
  scaleId?: string;
  viewCenter: Point2;
};

function viewCenterOf(drawing: VectorDrawing, viewport: Viewport): Point2;

function viewSourceToDrawingRequest(
  source: ViewSource,
  options?: {
    cutElevation?: number;
    hideHidden?: boolean;
  },
): DrawingRequest;

function modelToPaper(modelMeters: number, scale: number): number;

interface SheetPolicy {
  style: PaperStyle;
  paperColor: string;
  ground: 'screen' | 'print' | 'both';
  sheetSalt: number;
  viewportTextInk: string;
  unresolved: string[];
}

interface PlacedDrawing {
  primitives: DrawingPrimitive[];
  readonly lines: VectorLine[];
  texts: VectorText[];
  clip?: {
    x: number;
    y: number;
    width: number;
    height: number;
  };
  pen?: PenContext;
}

interface FitViewport {
  width: number;
  height: number;
}

interface FitOptions {
  pixelsPerMm: number;
  padding: number;
  minScale: number;
  maxScale: number;
}

interface FitTransform {
  scale: number;
  x: number;
  y: number;
}