import browser from "./browser.js";
import dom from "./domObjects.js";
import * as domUtils from "./domUtils.js";
import hypot from "./hypot.js";
import * as is from "./is.js";
import pointerExtend from "./pointerExtend.js";
export function copyCoords(dest, src) {
  dest.page = dest.page || {};
  dest.page.x = src.page.x;
  dest.page.y = src.page.y;
  dest.client = dest.client || {};
  dest.client.x = src.client.x;
  dest.client.y = src.client.y;
  dest.timeStamp = src.timeStamp;
}
export function setCoordDeltas(targetObj, prev, cur) {
  targetObj.page.x = cur.page.x - prev.page.x;
  targetObj.page.y = cur.page.y - prev.page.y;
  targetObj.client.x = cur.client.x - prev.client.x;
  targetObj.client.y = cur.client.y - prev.client.y;
  targetObj.timeStamp = cur.timeStamp - prev.timeStamp;
}
export function setCoordVelocity(targetObj, delta) {
  const dt = Math.max(delta.timeStamp / 1000, 0.001);
  targetObj.page.x = delta.page.x / dt;
  targetObj.page.y = delta.page.y / dt;
  targetObj.client.x = delta.client.x / dt;
  targetObj.client.y = delta.client.y / dt;
  targetObj.timeStamp = dt;
}
export function setZeroCoords(targetObj) {
  targetObj.page.x = 0;
  targetObj.page.y = 0;
  targetObj.client.x = 0;
  targetObj.client.y = 0;
}
export function isNativePointer(pointer) {
  return pointer instanceof dom.Event || pointer instanceof dom.Touch;
} // Get specified X/Y coords for mouse or event.touches[0]

export function getXY(type, pointer, xy) {
  xy = xy || {};
  type = type || 'page';
  xy.x = pointer[type + 'X'];
  xy.y = pointer[type + 'Y'];
  return xy;
}
export function getPageXY(pointer, page) {
  page = page || {
    x: 0,
    y: 0
  }; // Opera Mobile handles the viewport and scrolling oddly

  if (browser.isOperaMobile && isNativePointer(pointer)) {
    getXY('screen', pointer, page);
    page.x += window.scrollX;
    page.y += window.scrollY;
  } else {
    getXY('page', pointer, page);
  }

  return page;
}
export function getClientXY(pointer, client) {
  client = client || {};

  if (browser.isOperaMobile && isNativePointer(pointer)) {
    // Opera Mobile handles the viewport and scrolling oddly
    getXY('screen', pointer, client);
  } else {
    getXY('client', pointer, client);
  }

  return client;
}
export function getPointerId(pointer) {
  return is.number(pointer.pointerId) ? pointer.pointerId : pointer.identifier;
}
export function setCoords(targetObj, pointers, timeStamp) {
  const pointer = pointers.length > 1 ? pointerAverage(pointers) : pointers[0];
  const tmpXY = {};
  getPageXY(pointer, tmpXY);
  targetObj.page.x = tmpXY.x;
  targetObj.page.y = tmpXY.y;
  getClientXY(pointer, tmpXY);
  targetObj.client.x = tmpXY.x;
  targetObj.client.y = tmpXY.y;
  targetObj.timeStamp = timeStamp;
}
export function getTouchPair(event) {
  const touches = []; // array of touches is supplied

  if (is.array(event)) {
    touches[0] = event[0];
    touches[1] = event[1];
  } // an event
  else {
      if (event.type === 'touchend') {
        if (event.touches.length === 1) {
          touches[0] = event.touches[0];
          touches[1] = event.changedTouches[0];
        } else if (event.touches.length === 0) {
          touches[0] = event.changedTouches[0];
          touches[1] = event.changedTouches[1];
        }
      } else {
        touches[0] = event.touches[0];
        touches[1] = event.touches[1];
      }
    }

  return touches;
}
export function pointerAverage(pointers) {
  const average = {
    pageX: 0,
    pageY: 0,
    clientX: 0,
    clientY: 0,
    screenX: 0,
    screenY: 0
  };

  for (const pointer of pointers) {
    for (const prop in average) {
      average[prop] += pointer[prop];
    }
  }

  for (const prop in average) {
    average[prop] /= pointers.length;
  }

  return average;
}
export function touchBBox(event) {
  if (!event.length && !(event.touches && event.touches.length > 1)) {
    return null;
  }

  const touches = getTouchPair(event);
  const minX = Math.min(touches[0].pageX, touches[1].pageX);
  const minY = Math.min(touches[0].pageY, touches[1].pageY);
  const maxX = Math.max(touches[0].pageX, touches[1].pageX);
  const maxY = Math.max(touches[0].pageY, touches[1].pageY);
  return {
    x: minX,
    y: minY,
    left: minX,
    top: minY,
    right: maxX,
    bottom: maxY,
    width: maxX - minX,
    height: maxY - minY
  };
}
export function touchDistance(event, deltaSource) {
  const sourceX = deltaSource + 'X';
  const sourceY = deltaSource + 'Y';
  const touches = getTouchPair(event);
  const dx = touches[0][sourceX] - touches[1][sourceX];
  const dy = touches[0][sourceY] - touches[1][sourceY];
  return hypot(dx, dy);
}
export function touchAngle(event, deltaSource) {
  const sourceX = deltaSource + 'X';
  const sourceY = deltaSource + 'Y';
  const touches = getTouchPair(event);
  const dx = touches[1][sourceX] - touches[0][sourceX];
  const dy = touches[1][sourceY] - touches[0][sourceY];
  const angle = 180 * Math.atan2(dy, dx) / Math.PI;
  return angle;
}
export function getPointerType(pointer) {
  return is.string(pointer.pointerType) ? pointer.pointerType : is.number(pointer.pointerType) ? [undefined, undefined, 'touch', 'pen', 'mouse'][pointer.pointerType] // if the PointerEvent API isn't available, then the "pointer" must
  // be either a MouseEvent, TouchEvent, or Touch object
  : /touch/.test(pointer.type) || pointer instanceof dom.Touch ? 'touch' : 'mouse';
} // [ event.target, event.currentTarget ]

export function getEventTargets(event) {
  const path = is.func(event.composedPath) ? event.composedPath() : event.path;
  return [domUtils.getActualElement(path ? path[0] : event.target), domUtils.getActualElement(event.currentTarget)];
}
export function newCoords() {
  return {
    page: {
      x: 0,
      y: 0
    },
    client: {
      x: 0,
      y: 0
    },
    timeStamp: 0
  };
}
export function coordsToEvent(coords) {
  const event = {
    coords,

    get page() {
      return this.coords.page;
    },

    get client() {
      return this.coords.client;
    },

    get timeStamp() {
      return this.coords.timeStamp;
    },

    get pageX() {
      return this.coords.page.x;
    },

    get pageY() {
      return this.coords.page.y;
    },

    get clientX() {
      return this.coords.client.x;
    },

    get clientY() {
      return this.coords.client.y;
    },

    get pointerId() {
      return this.coords.pointerId;
    },

    get target() {
      return this.coords.target;
    },

    get type() {
      return this.coords.type;
    },

    get pointerType() {
      return this.coords.pointerType;
    },

    get buttons() {
      return this.coords.buttons;
    }

  };
  return event;
}
export { pointerExtend };
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