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/*
* Copyright (c) 2009 Tias Guns
* Copyright (c) 2009 Soren Hauberg
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdlib.h>
#include "calibrator.h"
#define SWAP(valtype,x,y) \
G_STMT_START { \
valtype t; t = (x); x = (y); y = t; \
} G_STMT_END
/* reset clicks */
void
reset (struct Calib *c)
{
c->num_clicks = 0;
}
/* check whether the coordinates are along the respective axis */
static gboolean
along_axis (struct Calib *c,
int xy,
int x0,
int y0)
{
return ((abs(xy - x0) <= c->threshold_misclick) ||
(abs(xy - y0) <= c->threshold_misclick));
}
/* add a click with the given coordinates */
gboolean
add_click (struct Calib *c,
int x,
int y)
{
g_debug ("Trying to add click (%d, %d)", x, y);
/* Double-click detection */
if (c->threshold_doubleclick > 0 && c->num_clicks > 0)
{
int i = c->num_clicks-1;
while (i >= 0)
{
if (abs(x - c->clicked_x[i]) <= c->threshold_doubleclick &&
abs(y - c->clicked_y[i]) <= c->threshold_doubleclick)
{
g_debug ("Detected double-click, ignoring");
return FALSE;
}
i--;
}
}
/* Mis-click detection */
if (c->threshold_misclick > 0 && c->num_clicks > 0)
{
gboolean misclick = TRUE;
if (c->num_clicks == 1)
{
/* check that along one axis of first point */
if (along_axis(c, x,c->clicked_x[0],c->clicked_y[0]) ||
along_axis(c, y,c->clicked_x[0],c->clicked_y[0]))
{
misclick = FALSE;
}
}
else if (c->num_clicks == 2)
{
/* check that along other axis of first point than second point */
if ((along_axis(c, y,c->clicked_x[0],c->clicked_y[0]) &&
along_axis(c, c->clicked_x[1],c->clicked_x[0],c->clicked_y[0])) ||
(along_axis(c, x,c->clicked_x[0],c->clicked_y[0]) &&
along_axis(c, c->clicked_y[1],c->clicked_x[0],c->clicked_y[0])))
{
misclick = FALSE;
}
}
else if (c->num_clicks == 3)
{
/* check that along both axis of second and third point */
if ((along_axis(c, x,c->clicked_x[1],c->clicked_y[1]) &&
along_axis(c, y,c->clicked_x[2],c->clicked_y[2])) ||
(along_axis(c, y,c->clicked_x[1],c->clicked_y[1]) &&
along_axis(c, x,c->clicked_x[2],c->clicked_y[2])))
{
misclick = FALSE;
}
}
if (misclick)
{
g_debug ("Detected misclick, resetting");
reset(c);
return FALSE;
}
}
g_debug ("Click (%d, %d) added", x, y);
c->clicked_x[c->num_clicks] = x;
c->clicked_y[c->num_clicks] = y;
c->num_clicks++;
return TRUE;
}
/* calculate and apply the calibration */
gboolean
finish (struct Calib *c,
XYinfo *new_axis,
gboolean *swap)
{
gboolean swap_xy;
float scale_x;
float scale_y;
float delta_x;
float delta_y;
XYinfo axis = {-1, -1, -1, -1};
if (c->num_clicks != 4)
return FALSE;
/* Should x and y be swapped? If the device and output are wider
* towards different axes, swapping must be performed
*
* FIXME: Would be even better to know the actual output orientation,
* not just the direction.
*/
swap_xy = (c->geometry.width < c->geometry.height);
/* Compute the scale to transform from pixel positions to [0..1]. */
scale_x = 1 / (float)c->geometry.width;
scale_y = 1 / (float)c->geometry.height;
axis.x_min = ((((c->clicked_x[UL] + c->clicked_x[LL]) / 2)) * scale_x);
axis.x_max = ((((c->clicked_x[UR] + c->clicked_x[LR]) / 2)) * scale_x);
axis.y_min = ((((c->clicked_y[UL] + c->clicked_y[UR]) / 2)) * scale_y);
axis.y_max = ((((c->clicked_y[LL] + c->clicked_y[LR]) / 2)) * scale_y);
/* Add/subtract the offset that comes from not having the points in the
* corners (using the same coordinate system they are currently in)
*/
delta_x = (axis.x_max - axis.x_min) / (float)(NUM_BLOCKS - 2);
axis.x_min -= delta_x;
axis.x_max += delta_x;
delta_y = (axis.y_max - axis.y_min) / (float)(NUM_BLOCKS - 2);
axis.y_min -= delta_y;
axis.y_max += delta_y;
/* If x and y has to be swapped we also have to swap the parameters */
if (swap_xy)
{
SWAP (gdouble, axis.x_min, axis.y_min);
SWAP (gdouble, axis.x_max, axis.y_max);
}
*new_axis = axis;
*swap = swap_xy;
return TRUE;
}
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