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/*
* viewBox helper class, common code used by root, symbol, marker, pattern, image, view
*
* Authors:
* Lauris Kaplinski <lauris@kaplinski.com> (code extracted from symbol.cpp)
* Tavmjong Bah <tavmjong@free.fr>
* Johan Engelen
*
* Copyright (C) 2013-2014 Tavmjong Bah, authors
*
* Released under GNU GPL, read the file 'COPYING' for more information
*
*/
#include <2geom/transforms.h>
#include "viewbox.h"
#include "enums.h"
#include "sp-item.h"
SPViewBox::SPViewBox()
: viewBox_set(false)
, viewBox()
, aspect_set(false)
, aspect_align(SP_ASPECT_XMID_YMID) // Default per spec
, aspect_clip(SP_ASPECT_MEET)
, c2p(Geom::identity())
{
}
void SPViewBox::set_viewBox(const gchar* value) {
if (value) {
gchar *eptr = const_cast<gchar*>(value); // const-cast necessary because of const-incorrect interface definition of g_ascii_strtod
double x = g_ascii_strtod (eptr, &eptr);
while (*eptr && ((*eptr == ',') || (*eptr == ' '))) {
eptr++;
}
double y = g_ascii_strtod (eptr, &eptr);
while (*eptr && ((*eptr == ',') || (*eptr == ' '))) {
eptr++;
}
double width = g_ascii_strtod (eptr, &eptr);
while (*eptr && ((*eptr == ',') || (*eptr == ' '))) {
eptr++;
}
double height = g_ascii_strtod (eptr, &eptr);
while (*eptr && ((*eptr == ',') || (*eptr == ' '))) {
eptr++;
}
if ((width > 0) && (height > 0)) {
/* Set viewbox */
this->viewBox = Geom::Rect::from_xywh(x, y, width, height);
this->viewBox_set = true;
} else {
this->viewBox_set = false;
}
} else {
this->viewBox_set = false;
}
// The C++ way? -- not necessarily using iostreams
// std::string sv( value );
// std::replace( sv.begin(), sv.end(), ',', ' ');
// std::stringstream ss( sv );
// double x, y, width, height;
// ss >> x >> y >> width >> height;
}
void SPViewBox::set_preserveAspectRatio(const gchar* value) {
/* Do setup before, so we can use break to escape */
this->aspect_set = false;
this->aspect_align = SP_ASPECT_XMID_YMID; // Default per spec
this->aspect_clip = SP_ASPECT_MEET;
if (value) {
const gchar *p = value;
while (*p && (*p == 32)) {
p += 1;
}
if (!*p) {
return;
}
const gchar *e = p;
while (*e && (*e != 32)) {
e += 1;
}
int len = e - p;
if (len > 8) { // Can't have buffer overflow as 8 < 256
return;
}
gchar c[256];
memcpy (c, value, len);
c[len] = 0;
/* Now the actual part */
unsigned int align = SP_ASPECT_NONE;
if (!strcmp (c, "none")) {
align = SP_ASPECT_NONE;
} else if (!strcmp (c, "xMinYMin")) {
align = SP_ASPECT_XMIN_YMIN;
} else if (!strcmp (c, "xMidYMin")) {
align = SP_ASPECT_XMID_YMIN;
} else if (!strcmp (c, "xMaxYMin")) {
align = SP_ASPECT_XMAX_YMIN;
} else if (!strcmp (c, "xMinYMid")) {
align = SP_ASPECT_XMIN_YMID;
} else if (!strcmp (c, "xMidYMid")) {
align = SP_ASPECT_XMID_YMID;
} else if (!strcmp (c, "xMaxYMid")) {
align = SP_ASPECT_XMAX_YMID;
} else if (!strcmp (c, "xMinYMax")) {
align = SP_ASPECT_XMIN_YMAX;
} else if (!strcmp (c, "xMidYMax")) {
align = SP_ASPECT_XMID_YMAX;
} else if (!strcmp (c, "xMaxYMax")) {
align = SP_ASPECT_XMAX_YMAX;
} else {
return;
}
unsigned int clip = SP_ASPECT_MEET;
while (*e && (*e == 32)) {
e += 1;
}
if (*e) {
if (!strcmp (e, "meet")) {
clip = SP_ASPECT_MEET;
} else if (!strcmp (e, "slice")) {
clip = SP_ASPECT_SLICE;
} else {
return;
}
}
this->aspect_set = true;
this->aspect_align = align;
this->aspect_clip = clip;
}
}
// Apply scaling from viewbox
void SPViewBox::apply_viewbox(const Geom::Rect& in, double scale_none) {
/* Determine actual viewbox in viewport coordinates */
// scale_none is the scale that would apply if the viewbox and page size are same size
// it is passed here because it is a double-precision variable, while 'in' is originally float
double x = 0.0;
double y = 0.0;
double scale_x = in.width() / this->viewBox.width();
double scale_y = in.height() / this->viewBox.height();
double scale_uniform = 1.0; // used only if scaling is uniform
if (Geom::are_near(scale_x / scale_y, 1.0, Geom::EPSILON)) {
// scaling is already uniform, reduce numerical error
scale_uniform = (scale_x + scale_y)/2.0;
if (Geom::are_near(scale_uniform / scale_none, 1.0, Geom::EPSILON))
scale_uniform = scale_none; // objects are same size, reduce numerical error
scale_x = scale_uniform;
scale_y = scale_uniform;
} else if (this->aspect_align != SP_ASPECT_NONE) {
// scaling is not uniform, but force it to be
scale_uniform = (this->aspect_clip == SP_ASPECT_MEET) ? MIN (scale_x, scale_y) : MAX (scale_x, scale_y);
scale_x = scale_uniform;
scale_y = scale_uniform;
double width = this->viewBox.width() * scale_uniform;
double height = this->viewBox.height() * scale_uniform;
/* Now place viewbox to requested position */
switch (this->aspect_align) {
case SP_ASPECT_XMIN_YMIN:
break;
case SP_ASPECT_XMID_YMIN:
x = 0.5 * (in.width() - width);
break;
case SP_ASPECT_XMAX_YMIN:
x = 1.0 * (in.width() - width);
break;
case SP_ASPECT_XMIN_YMID:
y = 0.5 * (in.height() - height);
break;
case SP_ASPECT_XMID_YMID:
x = 0.5 * (in.width() - width);
y = 0.5 * (in.height() - height);
break;
case SP_ASPECT_XMAX_YMID:
x = 1.0 * (in.width() - width);
y = 0.5 * (in.height() - height);
break;
case SP_ASPECT_XMIN_YMAX:
y = 1.0 * (in.height() - height);
break;
case SP_ASPECT_XMID_YMAX:
x = 0.5 * (in.width() - width);
y = 1.0 * (in.height() - height);
break;
case SP_ASPECT_XMAX_YMAX:
x = 1.0 * (in.width() - width);
y = 1.0 * (in.height() - height);
break;
default:
break;
}
}
/* Viewbox transform from scale and position */
Geom::Affine q;
q[0] = scale_x;
q[1] = 0.0;
q[2] = 0.0;
q[3] = scale_y;
q[4] = x - scale_x * this->viewBox.left();
q[5] = y - scale_y * this->viewBox.top();
// std::cout << " q\n" << q << std::endl;
/* Append viewbox transformation */
this->c2p = q * this->c2p;
}
SPItemCtx SPViewBox::get_rctx(const SPItemCtx* ictx, double scale_none) {
/* Create copy of item context */
SPItemCtx rctx = *ictx;
/* Calculate child to parent transformation */
/* Apply parent translation (set up as viewport) */
this->c2p = Geom::Translate(rctx.viewport.min());
if (this->viewBox_set) {
// Adjusts c2p for viewbox
apply_viewbox( rctx.viewport, scale_none );
}
rctx.i2doc = this->c2p * rctx.i2doc;
/* If viewBox is set initialize child viewport */
/* Otherwise it is already correct */
if (this->viewBox_set) {
rctx.viewport = this->viewBox;
rctx.i2vp = Geom::identity();
}
return rctx;
}
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-basic-offset:2
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=2:tabstop=8:softtabstop=2:fileencoding=utf-8:textwidth=99 :
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