Class: Mathematical::Process

Inherits:
Object
  • Object
show all
Defined in:
ext/mathematical/mathematical.c

Instance Method Summary collapse

Constructor Details

#initialize(rb_Options) ⇒ Object 



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# File 'ext/mathematical/mathematical.c', line 60

static VALUE MATHEMATICAL_init(VALUE self, VALUE rb_Options) {
  Check_Type (rb_Options, T_HASH);
  VALUE ppi, zoom;

  ppi = rb_hash_aref(rb_Options, CSTR2SYM("ppi"));
  zoom = rb_hash_aref(rb_Options, CSTR2SYM("zoom"));

  Check_Type(ppi, T_FLOAT);
  Check_Type(zoom, T_FLOAT);

  rb_iv_set(self, "@ppi", ppi);
  rb_iv_set(self, "@zoom", zoom);

  return self;
}

Instance Method Details

#process(rb_LatexCode, rb_TempFile) ⇒ Object 



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# File 'ext/mathematical/mathematical.c', line 76

static VALUE MATHEMATICAL_process(VALUE self, VALUE rb_LatexCode, VALUE rb_TempFile) {
  Check_Type (rb_LatexCode, T_STRING);
  Check_Type (rb_TempFile, T_STRING);

  const char *latex_code = StringValueCStr(rb_LatexCode);
  int latex_size = strlen(latex_code);

  const char *tempfile = StringValueCStr(rb_TempFile);

  g_type_init ();

  // convert the TeX math to MathML
  char * mathml = lsm_itex_to_mathml(latex_code, latex_size);

  if (mathml == NULL) rb_raise(rb_eRuntimeError, "Failed to parse itex");

  int mathml_size = strlen(mathml);

  LsmDomDocument *document;
  document = lsm_dom_document_new_from_memory(mathml, mathml_size, NULL);

  lsm_itex_free_mathml_buffer (mathml);

  if (document == NULL) rb_raise(rb_eRuntimeError, "Failed to create document");

  LsmDomView *view;

  double ppi = NUM2DBL(rb_iv_get(self, "@ppi"));
  double zoom = NUM2DBL(rb_iv_get(self, "@zoom"));

  view = lsm_dom_document_create_view (document);
  lsm_dom_view_set_resolution (view, ppi);

  double width_pt = 2.0, height_pt = 2.0;
  unsigned int height, width;

  lsm_dom_view_get_size (view, &width_pt, &height_pt, NULL);
  lsm_dom_view_get_size_pixels (view, &width, &height, NULL);

  width_pt *= zoom;
  height_pt *= zoom;
  width *= zoom;
  height *= zoom;

  cairo_t *cairo;
  cairo_surface_t *surface;

  surface = cairo_svg_surface_create (tempfile, width_pt, height_pt);
  cairo = cairo_create (surface);
  cairo_surface_destroy (surface);
  cairo_scale (cairo, zoom, zoom);
  lsm_dom_view_render (view, cairo, 0, 0);

  cairo_destroy (cairo);
  g_object_unref (view);
  g_object_unref (document);

  char* svg_contents = readFile(tempfile);

  if (svg_contents == NULL) rb_raise(rb_eRuntimeError, "Failed to read SVG contents");

  return rb_str_new2(readFile(tempfile));
}