@egjs/axes/src/Coordinate.ts

A module used to change the information of user action entered by various input devices such as touch screen or mouse into the logical virtual coordinates. You can easily create a UI that responds to user actions.

/*
 * Copyright (c) 2015 NAVER Corp.
 * egjs projects are licensed under the MIT license
 */
export const getInsidePosition = (
  destPos: number,
  range: number[],
  circular: boolean[],
  bounce?: number[]
): number => {
  let toDestPos: number = destPos;
  const targetRange: number[] = [
    circular[0] ? range[0] : bounce ? range[0] - bounce[0] : range[0],
    circular[1] ? range[1] : bounce ? range[1] + bounce[1] : range[1],
  ];

  toDestPos = Math.max(targetRange[0], toDestPos);
  toDestPos = Math.min(targetRange[1], toDestPos);

  return toDestPos;
};

// determine outside
export const isOutside = (pos: number, range: number[]): boolean => {
  return pos < range[0] || pos > range[1];
};

// determine whether position has reached the maximum moveable area
export const isEndofBounce = (
  pos: number,
  range: number[],
  bounce: number[],
  circular: boolean[]
): boolean => {
  return (
    (!circular[0] && pos === range[0] - bounce[0]) ||
    (!circular[1] && pos === range[1] + bounce[1])
  );
};

export const getDuration = (distance: number, deceleration): number => {
  const duration = Math.sqrt((distance / deceleration) * 2);

  // when duration is under 100, then value is zero
  return duration < 100 ? 0 : duration;
};

export const isCircularable = (
  destPos: number,
  range: number[],
  circular: boolean[]
): boolean => {
  return (
    (circular[1] && destPos > range[1]) || (circular[0] && destPos < range[0])
  );
};

export const getCirculatedPos = (
  pos: number,
  range: number[],
  circular: boolean[]
): number => {
  let toPos = pos;
  const min = range[0];
  const max = range[1];
  const length = max - min;

  if (circular[1] && pos > max) {
    // right
    toPos = ((toPos - max) % length) + min;
  }
  if (circular[0] && pos < min) {
    // left
    toPos = ((toPos - min) % length) + max;
  }
  return toPos;
};