import type { ObjectHolder } from '../../core/model/Project';
import type { Vec2 } from '../../core/model/Properties';
import type { DrawItem } from '../../viewport/items';
import type { EditorState } from '../state';

/** Below this on-screen spacing a grid is noise rather than orientation, so it is dropped. */
export const MIN_GRID_STEP = 12;

/** What the scene view lends the tools that work inside it. */
export interface SceneViewHost {
  readonly state: EditorState;
  /** What the view shows and edits. */
  holder(): ObjectHolder | undefined;
  /** What the view drew last. */
  items(): readonly DrawItem[];
  /** The world point under a global pointer position. */
  worldAt(global: Vec2): Vec2;
  /** Screen pixels per world unit. */
  scale(): number;
  redraw(): void;
}