/** Handles the "point" command that adds a point to the point list. */ void EmSpecialHandler::point (InputReader &ir, SpecialActions &actions) { DPair pos(actions.getX(), actions.getY()); int n = ir.getInt(); if (ir.getPunct() == ',') { pos.x(ir.getDouble()); if (ir.getPunct() == ',') pos.y(ir.getDouble()); } _points[n] = pos; }
/** Embeds the virtual rectangle (x, y ,w , h) into the current bounding box, * where (x,y) is the lower left vertex composed of the current DVI position. * @param[in] w width of the rectangle in PS point units * @param[in] h height of the rectangle in PS point units * @param[in] d depth of the rectangle in PS point units * @param[in] transform if true, apply the current transformation matrix to the rectangle * @param[in] actions object providing the actions that can be performed by the SpecialHandler */ static void update_bbox (Length w, Length h, Length d, bool transform, SpecialActions &actions) { double x = actions.getX(); double y = actions.getY(); BoundingBox bbox1(x, y, x+w.bp(), y-h.bp()); BoundingBox bbox2(x, y, x+w.bp(), y+d.bp()); if (transform) { bbox1.transform(actions.getMatrix()); bbox2.transform(actions.getMatrix()); } actions.embed(bbox1); actions.embed(bbox2); }
void DvisvgmSpecialHandler::processImg (InputReader &ir, SpecialActions &actions) { try { Length w = read_length(ir); Length h = read_length(ir); string f = ir.getString(); update_bbox(w, h, Length(0), false, actions); auto img = util::make_unique<XMLElement>("image"); img->addAttribute("x", actions.getX()); img->addAttribute("y", actions.getY()); img->addAttribute("width", w.bp()); img->addAttribute("height", h.bp()); img->addAttribute("xlink:href", f); if (!actions.getMatrix().isIdentity()) img->addAttribute("transform", actions.getMatrix().toSVG()); actions.svgTree().appendToPage(std::move(img)); } catch (const UnitException &e) { throw SpecialException(string("dvisvgm:img: ") + e.what()); } }
/** Replaces constants of the form {?name} by their corresponding value. * @param[in,out] str text to expand * @param[in] actions interfcae to the world outside the special handler */ static void expand_constants (string &str, SpecialActions &actions) { bool repl_bbox = true; while (repl_bbox) { size_t pos = str.find("{?bbox "); if (pos == string::npos) repl_bbox = false; else { size_t endpos = pos+7; while (endpos < str.length() && isalnum(str[endpos])) ++endpos; if (str[endpos] == '}') { BoundingBox &box=actions.bbox(str.substr(pos+7, endpos-pos-7)); str.replace(pos, endpos-pos+1, box.toSVGViewBox()); } else repl_bbox = false; } } struct Constant { const char *name; string val; }; const array<Constant, 5> constants {{ {"x", XMLString(actions.getX())}, {"y", XMLString(actions.getY())}, {"color", actions.getColor().svgColorString()}, {"matrix", actions.getMatrix().toSVG()}, {"nl", "\n"}, }}; for (const Constant &constant : constants) { const string pattern = string("{?")+constant.name+"}"; size_t pos = str.find(pattern); while (pos != string::npos) { str.replace(pos, strlen(constant.name)+3, constant.val); pos = str.find(pattern, pos+constant.val.length()); // look for further matches } } }
/** Handles the "lineto" command that sraws a straight line from the current drawing position * to the current DVI position, and sets the drawing position to the DVI position afterwards. */ void EmSpecialHandler::lineto (InputReader&, SpecialActions &actions) { DPair currpos(actions.getX(), actions.getY()); create_line(_pos, currpos, 'p', 'p', _linewidth, actions); _pos = currpos; }
/** Handles the "moveto" command that sets the drawing position to the current DVI position. */ void EmSpecialHandler::moveto (InputReader&, SpecialActions &actions) { _pos.x(actions.getX()); _pos.y(actions.getY()); }