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/*
* This file is part of gerbolyze, a vector image preprocessing toolchain
* Copyright (C) 2021 Jan Sebastian Götte <gerbolyze@jaseg.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include "svg_import_util.h"
#include "svg_pattern.h"
#include "svg_import_defs.h"
#include "svg_geom.h"
#include <gerbolyze.hpp>
using namespace std;
gerbolyze::Pattern::Pattern(const pugi::xml_node &node, SVGDocument &doc) : _node(node), doc(&doc) {
/* Read pattern attributes from SVG node */
x = usvg_double_attr(node, "x");
y = usvg_double_attr(node, "y");
w = usvg_double_attr(node, "width");
h = usvg_double_attr(node, "height");
patternTransform = xform2d(node.attribute("patternTransform").value());
bool invert_success = false;
patternTransform_inv = xform2d(patternTransform).invert(&invert_success);
if (!invert_success) {
cerr << "Warning: Cannot invert patternTransform matrix on pattern \"" << node.attribute("id").value() << "\"." << endl;
}
string vb_s(node.attribute("viewBox").value());
has_vb = !vb_s.empty();
if (has_vb) {
istringstream vb_stream(vb_s);
vb_stream >> vb_x >> vb_y >> vb_w >> vb_h;
}
patternUnits = map_str_to_units(node.attribute("patternUnits").value(), SVG_ObjectBoundingBox);
patternContentUnits = map_str_to_units(node.attribute("patternContentUnits").value(), SVG_UserSpaceOnUse);
}
/* Tile pattern into gerber. Note that this function may be called several times in case the pattern is
* referenced from multiple places, so we must not clobber any of the object's state. */
void gerbolyze::Pattern::tile (gerbolyze::RenderContext &ctx) {
assert(doc);
/* Transform x, y, w, h from pattern coordinate space into parent coordinates by applying the inverse
* patternTransform. This is necessary so we iterate over the correct bounds when tiling below */
d2p pos_xf = ctx.mat().doc2phys(d2p{x, y});
double inst_x = pos_xf[0], inst_y = pos_xf[1];
double inst_w = ctx.mat().doc2phys_dist(w);
double inst_h = ctx.mat().doc2phys_dist(h);
ClipperLib::IntRect clip_bounds = get_paths_bounds(ctx.clip());
double bx = clip_bounds.left / clipper_scale;
double by = clip_bounds.top / clipper_scale;
double bw = (clip_bounds.right - clip_bounds.left) / clipper_scale;
double bh = (clip_bounds.bottom - clip_bounds.top) / clipper_scale;
d2p clip_p0 = patternTransform_inv.doc2phys(d2p{bx, by});
d2p clip_p1 = patternTransform_inv.doc2phys(d2p{bx+bw, by+bh});
bx = fmin(clip_p0[0], clip_p1[0]);
by = fmin(clip_p0[1], clip_p1[1]);
bw = fmax(clip_p0[0], clip_p1[0]) - bx;
bh = fmax(clip_p0[1], clip_p1[1]) - by;
if (patternUnits == SVG_ObjectBoundingBox) {
inst_x *= bw;
inst_y *= bh;
inst_w *= bw;
inst_h *= bh;
}
/* Switch to pattern coordinates */
RenderContext pat_ctx(ctx, patternTransform);
/* Iterate over all pattern tiles in pattern coordinates */
for (double inst_off_x = fmod(inst_x, inst_w) - 2*inst_w;
inst_off_x < bx + bw + 2*inst_w;
inst_off_x += inst_w) {
for (double inst_off_y = fmod(inst_y, inst_h) - 2*inst_h;
inst_off_y < by + bh + 2*inst_h;
inst_off_y += inst_h) {
xform2d elem_xf;
/* Change into this individual tile's coordinate system */
elem_xf.translate(inst_off_x, inst_off_y);
if (has_vb) {
elem_xf.translate(vb_x, vb_y);
elem_xf.scale(inst_w / vb_w, inst_h / vb_h);
} else if (patternContentUnits == SVG_ObjectBoundingBox) {
elem_xf.scale(bw, bh);
}
/* Export the pattern tile's content like a group */
RenderContext elem_ctx(pat_ctx, elem_xf);
if (ctx.settings().pattern_complete_tiles_only) {
ClipperLib::Clipper c;
double eps = 1e-6;
Polygon poly = {{eps, eps}, {inst_w-eps, eps}, {inst_w-eps, inst_h-eps}, {eps, inst_h-eps}};
elem_ctx.mat().transform_polygon(poly);
ClipperLib::Path path(poly.size());
for (size_t i=0; i<poly.size(); i++) {
long long int x = poly[i][0] * clipper_scale, y = poly[i][1] * clipper_scale;
path[i] = {x, y};
}
ClipperLib::Paths out;
c.StrictlySimple(true);
c.AddPath(path, ClipperLib::ptSubject, /* closed */ true);
c.AddPaths(elem_ctx.clip(), ClipperLib::ptClip, /* closed */ true);
c.Execute(ClipperLib::ctDifference, out, ClipperLib::pftNonZero);
if (out.size() > 0) {
continue;
}
}
doc->export_svg_group(elem_ctx, _node);
}
}
}
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