Viewport

interface Viewport {
  x: number
  y: number
  zoom: number
}

interface ZoomRange {
  min: number
  max: number
}

const DEFAULT_ZOOM_RANGE: ZoomRange = { min: 0.1, max: 8 }

function createViewport(): Viewport

function screenToPage(viewport: Viewport, screenX: number, screenY: number): { x: number; y: number }

function pageToScreen(viewport: Viewport, pageX: number, pageY: number): { x: number; y: number }

function setViewport(viewport: Viewport, next: Partial<Viewport>): Viewport

function panViewport(viewport: Viewport, deltaX: number, deltaY: number): Viewport

function zoomViewport(viewport: Viewport, factor: number, centerX: number, centerY: number): Viewport

function clampZoom(viewport: Viewport, range: ZoomRange): Viewport

function beginCameraPan(viewport: Viewport): CameraPanSession
function moveCameraPan(session: CameraPanSession, deltaX: number, deltaY: number): Viewport

function startCameraSlide(viewport: Viewport, velocityX: number, velocityY: number, options?: CameraSlideOptions): CameraSlideAnimation