113 lines
4.4 KiB
C++
113 lines
4.4 KiB
C++
/*
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* This file is part of gerbolyze, a vector image preprocessing toolchain
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* Copyright (C) 2021 Jan Sebastian Götte <gerbolyze@jaseg.de>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <assert.h>
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#include "svg_import_util.h"
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#include "svg_pattern.h"
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#include "svg_import_defs.h"
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#include "svg_geom.h"
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#include <gerbolyze.hpp>
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using namespace std;
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gerbolyze::Pattern::Pattern(const pugi::xml_node &node, SVGDocument &doc) : _node(node), doc(&doc) {
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/* Read pattern attributes from SVG node */
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cerr << "creating pattern for node with id \"" << node.attribute("id").value() << "\"" << endl;
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x = usvg_double_attr(node, "x");
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y = usvg_double_attr(node, "y");
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w = usvg_double_attr(node, "width");
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h = usvg_double_attr(node, "height");
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patternTransform = node.attribute("patternTransform").value();
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string vb_s(node.attribute("viewBox").value());
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has_vb = !vb_s.empty();
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if (has_vb) {
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istringstream vb_stream(vb_s);
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vb_stream >> vb_x >> vb_y >> vb_w >> vb_h;
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}
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patternUnits = map_str_to_units(node.attribute("patternUnits").value(), SVG_ObjectBoundingBox);
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patternContentUnits = map_str_to_units(node.attribute("patternContentUnits").value(), SVG_UserSpaceOnUse);
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}
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/* Tile pattern into gerber. Note that this function may be called several times in case the pattern is
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* referenced from multiple places, so we must not clobber any of the object's state. */
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void gerbolyze::Pattern::tile (const gerbolyze::RenderSettings &rset, ClipperLib::Paths &clip) {
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assert(doc);
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cairo_t *cr = doc->cairo();
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assert(cr);
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cairo_save(cr);
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/* Transform x, y, w, h from pattern coordinate space into parent coordinates by applying the inverse
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* patternTransform. This is necessary so we iterate over the correct bounds when tiling below */
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cairo_matrix_t mat;
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load_cairo_matrix_from_svg(patternTransform, mat);
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if (cairo_matrix_invert(&mat) != CAIRO_STATUS_SUCCESS) {
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cerr << "Cannot invert patternTransform matrix on pattern \"" << _node.attribute("id").value() << "\"." << endl;
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cairo_restore(cr);
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}
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double inst_x = x, inst_y = y, inst_w = w, inst_h = h;
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cairo_user_to_device(cr, &inst_x, &inst_y);
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cairo_user_to_device_distance(cr, &inst_w, &inst_h);
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cairo_restore(cr);
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ClipperLib::IntRect clip_bounds = get_paths_bounds(clip);
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double bx = clip_bounds.left / clipper_scale;
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double by = clip_bounds.top / clipper_scale;
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double bw = (clip_bounds.right - clip_bounds.left) / clipper_scale;
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double bh = (clip_bounds.bottom - clip_bounds.top) / clipper_scale;
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if (patternUnits == SVG_ObjectBoundingBox) {
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inst_x *= bw;
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inst_y *= bh;
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inst_w *= bw;
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inst_h *= bh;
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}
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/* Switch to pattern coordinates */
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cairo_save(cr);
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cairo_translate(cr, bx, by);
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apply_cairo_transform_from_svg(cr, patternTransform);
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/* Iterate over all pattern tiles in pattern coordinates */
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for (double inst_off_x = fmod(inst_x, inst_w) - inst_w;
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inst_off_x < bw + inst_w;
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inst_off_x += inst_w) {
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for (double inst_off_y = fmod(inst_y, inst_h) - inst_h;
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inst_off_y < bh + inst_h;
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inst_off_y += inst_h) {
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cairo_save(cr);
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/* Change into this individual tile's coordinate system */
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cairo_translate(cr, inst_off_x, inst_off_y);
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if (has_vb) {
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cairo_translate(cr, vb_x, vb_y);
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cairo_scale(cr, inst_w / vb_w, inst_h / vb_h);
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} else if (patternContentUnits == SVG_ObjectBoundingBox) {
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cairo_scale(cr, bw, bh);
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}
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/* Export the pattern tile's content like a group */
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doc->export_svg_group(rset, _node, clip);
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cairo_restore(cr);
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}
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}
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cairo_restore(cr);
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}
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