/** Creates the SVG element that will a the line.
* @param[in] p1 first endpoint in PS point units
* @param[in] p2 second endpoint in PS point units
* @param[in] c1 cut method of first endpoint ('h', 'v' or 'p')
* @param[in] c2 cut method of second endpoint ('h', 'v' or 'p')
* @param[in] lw line width in PS point units
* @param[in] actions object providing the actions that can be performed by the SpecialHandler */
static void create_line (const DPair &p1, const DPair &p2, char c1, char c2, double lw, SpecialActions &actions) {
unique_ptr<XMLElementNode> node;
DPair dir = p2-p1;
if (dir.x() == 0 || dir.y() == 0 || (c1 == 'p' && c2 == 'p')) {
// draw regular line
node = util::make_unique<XMLElementNode>("line");
node->addAttribute("x1", p1.x());
node->addAttribute("y1", p1.y());
node->addAttribute("x2", p2.x());
node->addAttribute("y2", p2.y());
node->addAttribute("stroke-width", lw);
node->addAttribute("stroke", actions.getColor().svgColorString());
// update bounding box
DPair cv = cut_vector('p', dir, lw);
actions.embed(p1+cv);
actions.embed(p1-cv);
actions.embed(p2+cv);
actions.embed(p2-cv);
}
else {
// draw polygon
DPair cv1 = cut_vector(c1, dir, lw);
DPair cv2 = cut_vector(c2, dir, lw);
DPair q11 = p1+cv1, q12 = p1-cv1;
DPair q21 = p2+cv2, q22 = p2-cv2;
ostringstream oss;
oss << XMLString(q11.x()) << ',' << XMLString(q11.y()) << ' '
<< XMLString(q12.x()) << ',' << XMLString(q12.y()) << ' '
<< XMLString(q22.x()) << ',' << XMLString(q22.y()) << ' '
<< XMLString(q21.x()) << ',' << XMLString(q21.y());
node = util::make_unique<XMLElementNode>("polygon");
node->addAttribute("points", oss.str());
if (actions.getColor() != Color::BLACK)
node->addAttribute("fill", actions.getColor().svgColorString());
// update bounding box
actions.embed(q11);
actions.embed(q12);
actions.embed(q21);
actions.embed(q22);
}
actions.appendToPage(std::move(node));
}
/** 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
}
}
}
