dwg2SVG 转化后文字丢失分析

        libredwg开源项目中的dwg2SVG命令可以将dwg文件转换成svg文件，实际使用发现转化后的svg相对于dwg存在mtext字段丢失问题，对代码进行分析发现代码中不处理DWG_TYPE_MTEXT字段，所以存在文字不显示的情况。

static int
output_object (Dwg_Object *obj)
{int num = 1;if (!obj){fprintf (stderr, "object is NULL\n");return 0;}switch (obj->fixedtype){case DWG_TYPE_INSERT:output_INSERT (obj);break;case DWG_TYPE_LINE:output_LINE (obj);break;case DWG_TYPE_CIRCLE:output_CIRCLE (obj);break;case DWG_TYPE_TEXT:output_TEXT (obj);break;case DWG_TYPE_ARC:output_ARC (obj);break;case DWG_TYPE_POINT:output_POINT (obj);break;case DWG_TYPE_ELLIPSE:output_ELLIPSE (obj);break;case DWG_TYPE_SOLID:output_SOLID (obj);break;case DWG_TYPE__3DFACE:output_3DFACE (obj);break;case DWG_TYPE_POLYLINE_2D:output_POLYLINE_2D (obj);break;case DWG_TYPE_LWPOLYLINE:output_LWPOLYLINE (obj);break;case DWG_TYPE_RAY:output_RAY (obj);break;case DWG_TYPE_XLINE:output_XLINE (obj);break;case DWG_TYPE_SEQEND:case DWG_TYPE_VIEWPORT:break;default:num = 0;if (obj->supertype == DWG_SUPERTYPE_ENTITY)fprintf (stderr, "%s ignored\n", obj->name);// all other non-graphical objects are silently ignoredbreak;}return num;
}

// TODO: MTEXT
static void
output_TEXT (Dwg_Object *obj)
{Dwg_Data *dwg = obj->parent;Dwg_Entity_TEXT *text = obj->tio.entity->tio.TEXT;char *escaped;const char *fontfamily;BITCODE_H style_ref = text->style;Dwg_Object *o = style_ref ? dwg_ref_object_silent (dwg, style_ref) : NULL;Dwg_Object_STYLE *style = o ? o->tio.object->tio.STYLE : NULL;BITCODE_2DPOINT pt;if (!text->text_value || entity_invisible (obj))return;if (isnan_2BD (text->ins_pt) || isnan_3BD (text->extrusion))return;if (dwg->header.version >= R_2007)escaped = htmlwescape ((BITCODE_TU)text->text_value);elseescaped = htmlescape (text->text_value, dwg->header.codepage);if (style && o->fixedtype == DWG_TYPE_STYLE && style->font_file&& *style->font_file
#ifdef HAVE_STRCASESTR&& strcasestr (style->font_file, ".ttf")
#else&& (strstr (style->font_file, ".ttf")|| strstr (style->font_file, ".TTF"))
#endif){
#ifdef HAVE_STRCASESTRif (strcasestr (style->font_file, "Arial"))
#elseif ((strstr (style->font_file, "arial"))|| strstr (style->font_file, "Arial"))
#endif{fontfamily = "Arial";}elsefontfamily = "Verdana";}elsefontfamily = "Courier";transform_OCS_2d (&pt, text->ins_pt, text->extrusion);printf ("\t<text id=\"dwg-object-%d\" x=\"%f\" y=\"%f\" ""font-family=\"%s\" font-size=\"%f\" fill=\"%s\">%s</text>\n",obj->index, transform_X (pt.x), transform_Y (pt.y), fontfamily,text->height /* fontsize */, entity_color (obj->tio.entity),escaped ? escaped : "");free (escaped);
}