/* * 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 */ cerr << "creating pattern for node with id \"" << node.attribute("id").value() << "\"" << endl; 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 = node.attribute("patternTransform").value(); 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 (const gerbolyze::RenderSettings &rset, ClipperLib::Paths &clip) { assert(doc); cairo_t *cr = doc->cairo(); assert(cr); cairo_save(cr); /* 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 */ cairo_matrix_t mat; load_cairo_matrix_from_svg(patternTransform, mat); if (cairo_matrix_invert(&mat) != CAIRO_STATUS_SUCCESS) { cerr << "Cannot invert patternTransform matrix on pattern \"" << _node.attribute("id").value() << "\"." << endl; cairo_restore(cr); } double inst_x = x, inst_y = y, inst_w = w, inst_h = h; cairo_user_to_device(cr, &inst_x, &inst_y); cairo_user_to_device_distance(cr, &inst_w, &inst_h); cairo_restore(cr); ClipperLib::IntRect clip_bounds = get_paths_bounds(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; if (patternUnits == SVG_ObjectBoundingBox) { inst_x *= bw; inst_y *= bh; inst_w *= bw; inst_h *= bh; } /* Switch to pattern coordinates */ cairo_save(cr); cairo_translate(cr, bx, by); apply_cairo_transform_from_svg(cr, patternTransform); /* Iterate over all pattern tiles in pattern coordinates */ for (double inst_off_x = fmod(inst_x, inst_w) - inst_w; inst_off_x < bw + inst_w; inst_off_x += inst_w) { for (double inst_off_y = fmod(inst_y, inst_h) - inst_h; inst_off_y < bh + inst_h; inst_off_y += inst_h) { cairo_save(cr); /* Change into this individual tile's coordinate system */ cairo_translate(cr, inst_off_x, inst_off_y); if (has_vb) { cairo_translate(cr, vb_x, vb_y); cairo_scale(cr, inst_w / vb_w, inst_h / vb_h); } else if (patternContentUnits == SVG_ObjectBoundingBox) { cairo_scale(cr, bw, bh); } /* Export the pattern tile's content like a group */ doc->export_svg_group(rset, _node, clip); cairo_restore(cr); } } cairo_restore(cr); }