mouseSubregion.I

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/**
 * PANDA 3D SOFTWARE
 * Copyright (c) Carnegie Mellon University.  All rights reserved.
 *
 * All use of this software is subject to the terms of the revised BSD
 * license.  You should have received a copy of this license along
 * with this source code in a file named "LICENSE."
 *
 * @file mouseSubregion.I
 * @author drose
 * @date 2005-05-13
 */

/**
 * Retrieves the x coordinate of the left edge of the rectangle within the
 * window.  This number will be in the range [0..1].
 */
PN_stdfloat MouseSubregion::
get_left() const {
  return _l;
}

/**
 * Retrieves the x coordinate of the right edge of the rectangle within the
 * window.  This number will be in the range [0..1].
 */
PN_stdfloat MouseSubregion::
get_right() const {
  return _r;
}

/**
 * Retrieves the y coordinate of the bottom edge of the rectangle within the
 * window.  This number will be in the range [0..1].
 */
PN_stdfloat MouseSubregion::
get_bottom() const {
  return _b;
}

/**
 * Retrieves the y coordinate of the top edge of the rectangle within the
 * window.  This number will be in the range [0..1].
 */
PN_stdfloat MouseSubregion::
get_top() const {
  return _t;
}

/**
 * Changes the region of the window in which the mouse is considered to be
 * active.  The parameters are identical to those for a DisplayRegion: they
 * range from 0 to 1, where 0,0 is the lower left corner and 1,1 is the upper
 * right; (0, 1, 0, 1) represents the whole window.
 */
void MouseSubregion::
set_dimensions(PN_stdfloat l, PN_stdfloat r, PN_stdfloat b, PN_stdfloat t) {
  _l = l;
  _r = r;
  _b = b;
  _t = t;

  _minx = l * 2.0f - 1.0f;
  _miny = b * 2.0f - 1.0f;

  PN_stdfloat maxx = r * 2.0f - 1.0f;
  PN_stdfloat maxy = t * 2.0f - 1.0f;

  _scalex = 2.0f / (maxx - _minx);
  _scaley = 2.0f / (maxy - _miny);
}