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/*
Quickplot - an interactive 2D plotter
Copyright (C) 1998-2011 Lance Arsenault
This file is part of Quickplot.
Quickplot 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.
Quickplot 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 Quickplot. If not, see <http://www.gnu.org/licenses/>.
*/
/*************************************************************
* All data pasted into zoom and read from zoom is normalized
* to be a linear tranformation of a 0,0 to 1,1 box.
*************************************************************/
/* private */
static inline
void _qp_zoom_push(struct qp_zoom **z, double xscale,
double xshift, double yscale, double yshift)
{
struct qp_zoom *new_z;
ASSERT(z);
ASSERT(*z);
new_z = (struct qp_zoom*)qp_malloc(sizeof(*new_z));
new_z->xscale = xscale;
new_z->xshift = xshift;
new_z->yscale = yscale;
new_z->yshift = yshift;
new_z->next = *z;
*z = new_z;
}
static inline
void qp_zoom_push(struct qp_zoom **z, double xscale,
double xshift, double yscale, double yshift)
{
_qp_zoom_push(z, xscale*(*z)->xscale, xscale*(*z)->xshift + xshift,
yscale*(*z)->yscale, yscale*(*z)->yshift + yshift);
}
static inline
void qp_zoom_pop(struct qp_zoom **z)
{
ASSERT(z);
ASSERT(*z);
if((*z)->next)
{
struct qp_zoom *next;
next = (*z)->next;
free(*z);
*z = next;
}
}
/* free up all but the top of the stack */
static inline
void qp_zoom_pop_all(struct qp_zoom **z)
{
ASSERT(z);
ASSERT(*z);
while((*z)->next)
{
struct qp_zoom *next;
next = (*z)->next;
free(*z);
*z = next;
}
}
/* add a zoom that is a shift in the 0,0 to 1,1 space */
static inline
void qp_zoom_push_shift(struct qp_zoom **z, double dx, double dy)
{
_qp_zoom_push(z, (*z)->xscale, (*z)->xshift + dx,
(*z)->yscale, (*z)->yshift + dy);
}
/* xmin, ymin and xmax, ymax are normalized "close to"
* between 0,0 to 1,1
*
* You must be sure the xmin, ymin, xmax, ymax values
* are good before calling this. */
static inline
void qp_zoom_push_mm(struct qp_zoom **z,
double xmin, double ymin, double xmax, double ymax)
{
double xscale, xshift, yscale, yshift;
xscale = (*z)->xscale/(xmax - xmin);
yscale = (*z)->yscale/(ymax - ymin);
xshift = xscale*((*z)->xshift - xmin)/(*z)->xscale;
yshift = yscale*((*z)->yshift - ymin)/(*z)->yscale;
_qp_zoom_push(z, xscale, xshift, yscale, yshift);
}
static inline
struct qp_zoom *qp_zoom_create(double xscale, double xshift,
double yscale, double yshift)
{
struct qp_zoom *z;
z = (struct qp_zoom *)qp_malloc(sizeof(struct qp_zoom));
z->xscale = xscale;
z->xshift = xshift;
z->yscale = yscale;
z->yshift = yshift;
z->next = NULL;
return z;
}
/* We assume that there is one zoom from qp_zoom_create()
* to start with. */
static inline
void qp_zoom_copy(struct qp_zoom *z, const struct qp_zoom *org_z)
{
ASSERT(org_z);
ASSERT(z);
if(z->next)
{
/* Remove and free the old stack */
struct qp_zoom *n;
for(n=z->next;n;n=n->next)
free(n);
z->next = NULL;
}
/* Copy the current zoom */
z->xscale = org_z->xscale;
z->yscale = org_z->yscale;
z->xshift = org_z->xshift;
z->yshift = org_z->yshift;
for(org_z = org_z->next; org_z; org_z = org_z->next)
{
/* copy the rest of the zoom stack */
z->next = qp_zoom_create(org_z->xscale, org_z->xshift,
org_z->yscale, org_z->yshift);
z = z->next;
}
}
static inline
void qp_zoom_destroy(struct qp_zoom *z)
{
ASSERT(z);
while(z)
{
struct qp_zoom *next;
next = z->next;
free(z);
z = next;
}
}
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