contrib/brl/bbas/bxml/bsvg/bsvg_element.cxx

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//:
// \file
// \author Ozge C. Ozcanli (Brown)
// \date   April 21, 2009

#include "bsvg_element.h"
#include <vcl_cmath.h>

void bsvg_element::set_transformation(float trans_x, float trans_y, float rot)
{
  vcl_stringstream trans;
  trans << "translate(" << trans_x << ',' << trans_y << ") rotate(" << rot << ')';
  this->set_attribute("transform", trans.str());
}

void bsvg_element::set_location(float trans_x, float trans_y)
{
  vcl_stringstream trans;
  trans << "translate(" << trans_x << ',' << trans_y << ") ";
  this->set_attribute("transform", trans.str());
}

//: adds rotation to an existing translation if any
void bsvg_element::set_rotation(float rot)
{
  vcl_stringstream trans;
  trans << "rotate(" << rot << ')';

  vcl_string val;
  if (this->get_attribute("transform", val))
    val = val + " " + trans.str();
  else
    val = trans.str();

  this->set_attribute("transform", val);
}

void bsvg_element::set_fill_color(const vcl_string& c)
{
  this->set_attribute("fill", c);
}

vcl_string hex_value(unsigned red, unsigned green, unsigned blue)
{
  vcl_stringstream out; out << '#';
  unsigned first = red%16;
  unsigned second = red/16;
  char fc;
  if (second > 9) fc = 65 + (second-10);
  else fc = 48 + second;
  out << fc;
  if (first > 9) fc = 65 + (first-10);
  else fc = 48 + first;
  out << fc;
  first = green%16;
  second = green/16;
  if (second > 9) fc = 65 + (second-10);
  else fc = 48 + second;
  out << fc;
  if (first > 9) fc = 65 + (first-10);
  else fc = 48 + first;
  out << fc;
  first = blue%16;
  second = blue/16;
  if (second > 9) fc = 65 + (second-10);
  else fc = 48 + second;
  out << fc;
  if (first > 9) fc = 65 + (first-10);
  else fc = 48 + first;
  out << fc;
  return out.str();
}

//: turns the given red, green, blue values in range [0,255] to #00 00 00 notation (Hex color) four bytes for each color
void bsvg_element::set_fill_color(unsigned red, unsigned green, unsigned blue)
{
  vcl_string hexval = hex_value(red, green, blue);
  this->set_attribute("fill", hexval);
}

void bsvg_element::set_stroke_color(const vcl_string& c)
{
  this->set_attribute("stroke", c);
}

//: turns the given red, green, blue values in range [0,255] to #00 00 00 notation (Hex color) four bytes for each color
void bsvg_element::set_stroke_color(unsigned red, unsigned green, unsigned blue)
{
  vcl_string hexval = hex_value(red, green, blue);
  this->set_attribute("stroke", hexval);
}

void bsvg_element::set_stroke_width(float w)
{
  vcl_stringstream sw; sw << w;
  this->set_attribute("stroke-width", sw.str());
}

//: 0 <= opacity <= 1
void bsvg_element::set_fill_opacity(float o)
{
  vcl_stringstream os; os << o;
  this->set_attribute("fill-opacity", os.str());
}

//: 0 <= opacity <= 1
void bsvg_element::set_stroke_opacity(float o)
{
  vcl_stringstream os; os << o;
  this->set_attribute("stroke-opacity", os.str());
}

void bsvg_text::set_font_size(int s)
{
  vcl_stringstream fs; fs << s;
  this->set_attribute("font-size", fs.str());
}

bsvg_ellipse::bsvg_ellipse(float rx, float ry) : bsvg_element("ellipse") 
{
  vcl_stringstream rxs; rxs << rx; vcl_stringstream rys; rys << ry;
  this->set_attribute("rx", rxs.str());
  this->set_attribute("ry", rys.str());
}

bsvg_rectangle::bsvg_rectangle(float x, float y, float width, float height) : bsvg_element("rect") 
{
  vcl_stringstream xs; xs << x; vcl_stringstream ys; ys << y;
  vcl_stringstream ws; ws << width; vcl_stringstream hs; hs << height;

  this->set_attribute("x", xs.str());
  this->set_attribute("y", ys.str());
  this->set_attribute("width", ws.str());
  this->set_attribute("height", hs.str());
}

bsvg_line::bsvg_line(float x1, float y1, float x2, float y2) : bsvg_element("line")
{
  vcl_stringstream x1s; x1s << x1; vcl_stringstream y1s; y1s << y1;
  vcl_stringstream x2s; x2s << x2; vcl_stringstream y2s; y2s << y2;

  this->set_attribute("x1", x1s.str());
  this->set_attribute("y1", y1s.str());
  this->set_attribute("x2", x2s.str());
  this->set_attribute("y2", y2s.str());
}

bsvg_arrow_head::bsvg_arrow_head(float x, float y, float l) : bsvg_group()
{
  this->set_location(x,y);

  bsvg_line* l1 = new bsvg_line(0, 0, 0, l);
  l1->set_rotation(135);
  this->add_element(l1);

  bsvg_line* l2 = new bsvg_line(0, 0, 0, l);
  l2->set_rotation(45);
  this->add_element(l2);
}

bsvg_polyline::bsvg_polyline(const vcl_vector<float>& xs, const vcl_vector<float>& ys) : bsvg_element("polyline") 
{
  if (xs.size() == ys.size()) {
    vcl_stringstream ss;
    for (unsigned i = 0; i < xs.size(); i++) {
      ss << xs[i] << ',' << ys[i] << ' ';
    }
    this->set_attribute("points", ss.str());
  }
}

//: draw a splice e.g. for a "pie chart".
//  A splice is an arc of a full circle given by start and end angles and the
//  arc is closed at the ends by lines from and to the center of the circle pass
//  the angles in radians in range [0,2pi]
bsvg_splice::bsvg_splice(float center_x, float center_y, float radius, float start_angle, float end_angle, bool long_arc) : bsvg_group()
{
  // compute the first and second points on the arc using the start_angle and end_angle
  float first_point_x = radius*vcl_cos(start_angle)+center_x;
  float first_point_y = radius*-vcl_sin(start_angle)+center_y; // invert the y value 
  float second_point_x = radius*vcl_cos(end_angle)+center_x;
  float second_point_y = radius*-vcl_sin(end_angle)+center_y;

  bsvg_element* el = new bsvg_element("path");
  vcl_stringstream attr;
  attr << 'M' << center_x << ',' << center_y << ' ' << first_point_x << ',' << first_point_y << " A" << radius << ',' << radius << " 0 ";
  if (long_arc)
    attr << "1,0 ";
  else 
    attr << "0,0 ";
  attr << second_point_x << ',' << second_point_y << " z";
  el->set_attribute("d", attr.str());
  this->add_element(el);
}

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