spiegel-keyman/common/web/gesture-recognizer/src/inputSample.ts

namespace com.keyman.osk {
  /**
   * We want these to be readily and safely converted to and from
   * JSON (for unit test use and development)
   */
  export interface InputSample {
    /**
     * Represents the x-coordinate of the input sample
     * in 'client' / viewport coordinates.
     */
    clientX?: number;

    /**
     * Represents the x-coordinate of the input sample in
     * coordinates relative to the recognizer's `targetRoot`.
     */
    targetX: number;

    /**
     * Represents the y-coordinate of the input sample
     * in 'client' / viewport coordinates.
     */
    clientY?: number;

    /**
     * Represents the y-coordinate of the input sample in
     * coordinates relative to the recognizer's `targetRoot`.
     */
    targetY: number;

    /**
     * Represents the timestamp at which the input was observed
     * (in ms)
     */
    t: number;
  }

  export type InputSampleSequence = InputSample[];

  export function isAnInputSample(obj: any): obj is InputSample {
    return 'targetX' in obj && 'targetY' in obj && 't' in obj;
  }
}