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/* uber-scale.c
*
* Copyright (C) 2010 Christian Hergert <chris@dronelabs.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "uber-scale.h"
/**
* uber_scale_linear:
* @range: An #UberRange.
* @pixel_range: An #UberRange.
* @value: A pointer to the value to translate.
* @user_data: user data for scale.
*
* An #UberScale function to translate a value to the coordinate system in
* a linear fashion.
*
* Returns: %TRUE if successful; otherwise %FALSE.
* Side effects: None.
*/
gboolean
uber_scale_linear (const UberRange *range, /* IN */
const UberRange *pixel_range, /* IN */
gdouble *value, /* IN/OUT */
gpointer user_data) /* IN */
{
#define A (range->range)
#define B (pixel_range->range)
#define C (*value)
if (*value != 0.) {
*value = C * B / A;
}
#undef A
#undef B
#undef C
return TRUE;
}
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