Topic: DXF import/export coding
I try to explain how a dxf file is constructed and what have to be changed on exportdxf.cpp to get it working again.
if we take a look at the exportdxf.cpp file, a lot of the basic drawing types are there and maybe need some fine tunning on function of the changes that have to be made for the dxf export.
How is a dxf file constructed :
The file is devide into sections, each section is starting with a 0, SECTION, 2 HEADER
0
SECTION
2
HEADER
9
$ACADVER
1
AC1012The key code in a dxf file = 0
followed by the command = SECTION
The code 2 give section name.
if we take a look to createdxf.cpp : void Createdxf::dxfBegin (const QString& fileName)
QTextStream To_Dxf(&file);
To_Dxf << 999 << "\r\n";
To_Dxf << "QET" << "\r\n";
To_Dxf << 0 << "\r\n";
To_Dxf << "SECTION" << "\r\n";
To_Dxf << 2 << "\r\n";
To_Dxf << "HEADER" << "\r\n";
To_Dxf << 9 << "\r\n";
To_Dxf << "$ACADVER" << "\r\n";
To_Dxf << 1 << "\r\n";
To_Dxf << "AC1006" << "\r\n";The linse 58-59 have to be removed, the are not neaded and telling autocad that it is not a acad created dxf file.
A good starting point for dxf codes :[url=https://knowledge.autodesk.com/search-result/caas/CloudHelp/cloudhelp/2017/ENU/AutoCAD-DXF/files/GUID-235B22E0-A567-4CF6-92D3-38A2306D73F3-htm.html] acad dxf codes
[/url]
see also numerical list o dxf codes
A dxf file have 7 sections, so we need to created for each section a function to file it.We don't need to use them all, just the one we need.
The following functions have to be created :
I we look to the existhing code, everthing is put into the dxf file like it is.
The major change that have to be made is that the titelblocks and elements used i a qet page has to be writen to the block section and be used in the entities section, it is the same way you are using them in qelectrotech.
If we take a look to a simple qeletrotech project file :
<project folioSheetQuantity="0" version="0.70" title="">
<properties>
<property show="1" name="saveddate">2019-08-18</property>
<property show="1" name="savedfilepath">C:/Users/ronny.desmedt/OneDrive/dxf/basic file.qet</property>
<property show="1" name="savedtime">17:53</property>
<property show="1" name="savedfilename">basic file</property>
</properties>
<newdiagrams>
<border cols="17" rowsize="80" displaycols="true" displayrows="true" colsize="60" rows="8"/>
<inset filename="" folio="%id/%total" auto_page_num="" version="" author="" locmach="" title="" date="null" indexrev="" displayAt="bottom" plant="">
<properties>
<property show="1" name="project"></property>
<property show="1" name="file"></property>
</properties>
</inset>
<conductors type="multi" color2="#000000" function="" tension-protocol="" bicolor="false" dash-size="2" vertirotatetext="270" condsize="1" displaytext="1" onetextperfolio="0" vertical-alignment="AlignRight" num="_" numsize="7" formula="" horizrotatetext="0" horizontal-alignment="AlignBottom"/>
<report label="%f-%l%c"/>
<xrefs>
<xref type="commutator" snapto="label" displayhas="cross" powerprefix="" master_label="%f-%l%c" delayprefix="" showpowerctc="false" slave_label="(%f-%l%c)" switchprefix="" offset="0"/>
<xref type="coil" snapto="label" displayhas="cross" powerprefix="" master_label="%f-%l%c" delayprefix="" showpowerctc="false" slave_label="(%f-%l%c)" switchprefix="" offset="40"/>
<xref type="protection" snapto="label" displayhas="cross" powerprefix="" master_label="%f-%l%c" delayprefix="" showpowerctc="false" slave_label="(%f-%l%c)" switchprefix="" offset="0"/>
</xrefs>
<conductors_autonums current_autonum="" freeze_new_conductors="false"/>
<folio_autonums/>
<element_autonums freeze_new_elements="false" current_autonum=""/>
</newdiagrams>
<diagram freezeNewConductor="false" title="" colsize="60" cols="17" filename="" date="null" order="1" height="660" indexrev="" auto_page_num="" freezeNewElement="false" displayrows="true" version="0.70-RC2+474c94469d79751d3" rows="8" rowsize="80" locmach="" author="" displaycols="true" displayAt="bottom" folio="%id/%total" plant="">
<properties>
<property show="1" name="project"></property>
<property show="1" name="file"></property>
</properties>
<defaultconductor type="multi" color2="#000000" function="" tension-protocol="" bicolor="false" dash-size="2" vertirotatetext="270" condsize="1" displaytext="1" onetextperfolio="0" vertical-alignment="AlignRight" num="_" numsize="7" formula="" horizrotatetext="0" horizontal-alignment="AlignBottom"/>
<elements>
<element type="embed://import/10_electric/10_allpole/200_fuses&protective_gears/11_circuit_breakers/disjonct-m_2f.elmt" z="10" x="330" prefix="F" uuid="{4696d54d-0f44-409b-94c5-34fc2acfb74c}" orientation="0" y="320" freezeLabel="false">
<terminals>
<terminal id="0" x="-10" number="_" nameHidden="0" orientation="0" y="-26" name="_"/>
<terminal id="1" x="10" number="_" nameHidden="0" orientation="0" y="-26" name="_"/>
<terminal id="2" x="-10" number="_" nameHidden="0" orientation="2" y="16" name="_"/>
<terminal id="3" x="10" number="_" nameHidden="0" orientation="2" y="16" name="_"/>
</terminals>
<inputs/>
<elementInformations>
<elementInformation show="1" name="formula"></elementInformation>
</elementInformations>
<dynamic_texts>
<dynamic_elmt_text text_width="-1" Halignment="AlignLeft" Valignment="AlignTop" x="16" font="Sans Serif,9,-1,5,0,0,0,0,0,0,normal" rotation="0" uuid="{da0adb6c-9a34-488e-bc13-06186c2ec811}" y="-17.3334" frame="false" text_from="ElementInfo">
<text></text>
<info_name>label</info_name>
</dynamic_elmt_text>
</dynamic_texts>
<texts_groups/>
</element>
</elements>
<shapes>
<shape is_movable="1" type="Rectangle" x1="530" z="0" closed="0" y1="100" ry="0" y2="210" rx="0" x2="650">
<pen color="#000000" widthF="1" style="SolidLine"/>
<brush color="#000000" style="NoBrush"/>
</shape>
<shape is_movable="1" type="Line" x1="810" z="0" closed="0" y1="190" y2="470" x2="550">
<pen color="#000000" widthF="1" style="SolidLine"/>
<brush color="#000000" style="NoBrush"/>
</shape>
</shapes>
</diagram>
<collection>
<category name="import">
<names>
<name lang="pl">Elementy importowane</name>
<name lang="en">Imported elements</name>
<name lang="da">Importerede elementer</name>
<name lang="el">Εισηγμένα στοιχεία</name>
<name lang="fr">Éléments importés</name>
<name lang="nl">Elementen geïmporteerd</name>
<name lang="tr">İthal öğeler</name>
<name lang="es">Elementos importados</name>
<name lang="ru">Импортированные элементы</name>
<name lang="hr">Uvezeni elementi</name>
<name lang="de">Importierte elemente</name>
<name lang="sl">Uvoženi elementi</name>
<name lang="ca">Elements importats</name>
<name lang="cs">Zavedené prvky</name>
<name lang="pt">elementos importados</name>
<name lang="it">Elementi importati</name>
<name lang="ro">Elemente importate</name>
</names>
<category name="10_electric">
<names>
<name lang="pl">Elektrotechnika</name>
<name lang="en">Electric</name>
<name lang="da">Elektrisk</name>
<name lang="el">Ηλεκτρικά</name>
<name lang="nl">Elektrotechniek</name>
<name lang="fr">Electrique</name>
<name lang="ru">Электротехника</name>
<name lang="es">Eléctrica</name>
<name lang="de">Elektrik</name>
<name lang="it">Elettrica</name>
<name lang="cs">Elektrotechnika</name>
</names>
<category name="10_allpole">
<names>
<name lang="pl">Schematy wieloliniowe</name>
<name lang="en">All-pole</name>
<name lang="da">Flere ledere</name>
<name lang="el">Πολυγραμμικό</name>
<name lang="fr">Multifilaire</name>
<name lang="nl">Veel polig</name>
<name lang="ru">Многополюсные</name>
<name lang="es">Multifilar</name>
<name lang="de">Allpolig</name>
<name lang="cs">Vícežilový</name>
<name lang="it">Multifilare</name>
</names>
<category name="200_fuses&protective_gears">
<names>
<name lang="pl">Łączniki i zabezpieczenia</name>
<name lang="en">Fuses and protective gears</name>
<name lang="da">Sikringer og beskyttelsesudstyr</name>
<name lang="el">Ασφάλειες και εξαρτήματα προστασίας</name>
<name lang="fr">Fusibles et protections</name>
<name lang="nl">Zekeringen en beveiligingen</name>
<name lang="ru">Предохранители и элементы защиты</name>
<name lang="es">Fusibles y protecciones</name>
<name lang="de">Sicherungen und Schutzeinrichtungen</name>
<name lang="it">Fusibili e protezioni</name>
<name lang="cs">Tavné pojistky a ochrany</name>
</names>
<category name="11_circuit_breakers">
<names>
<name lang="pl">Wyłączniki</name>
<name lang="en">Circuit-breakers</name>
<name lang="ar">قواطع</name>
<name lang="da">Afbryder</name>
<name lang="el">Αυτόματοι διακόπτες</name>
<name lang="fr">Disjoncteurs</name>
<name lang="nl">Lastscheiders</name>
<name lang="ru">Выключатели</name>
<name lang="es">Disyuntores</name>
<name lang="de">Leitungsschutzschalter und Lastschalter</name>
<name lang="cs">Jističe</name>
<name lang="pt">Disjuntores</name>
<name lang="it">Relè termici</name>
</names>
<element name="disjonct-m_2f.elmt">
<definition type="element" hotspot_y="34" version="0.4" height="60" width="40" link_type="master" hotspot_x="20" orientation="dyyy">
<uuid uuid="{AFE0F3B3-00EE-4EC2-9458-E7934876F42B}"/>
<names>
<name lang="ar">قطب ثنائي القطبية قطبين محميين</name>
<name lang="de">Leitungsschutzschalter 2P</name>
<name lang="en">Circuit-breaker</name>
<name lang="es">Disyuntor termico magnetico en 2P</name>
<name lang="it">Int. Aut. Magneto-termico 2P</name>
<name lang="fr">Disjoncteur bipolaire 2 poles proteges</name>
<name lang="pl">Wyłącznik</name>
<name lang="nl">Lastscheider 2</name>
<name lang="cs">Dvojpólový jistič 2 póly chránící</name>
</names>
<kindInformations>
<kindInformation show="1" name="type">protection</kindInformation>
</kindInformations>
<informations>Author: The QElectroTech team
License: see http://qelectrotech.org/wiki/doc/elements_license</informations>
<description>
<line antialias="false" x1="-12" y1="-10" end2="none" length2="1.5" style="line-style:dashed;line-weight:thin;filling:none;color:black" y2="-10" length1="1.5" end1="none" x2="7"/>
<line antialias="false" x1="-10" y1="16" end2="none" length2="1.5" style="line-style:normal;line-weight:normal;filling:none;color:black" y2="20" length1="1.5" end1="none" x2="-10"/>
<arc antialias="true" angle="-180" x="-14" height="5" style="line-style:normal;line-weight:normal;filling:none;color:black" width="8" start="90" y="10.5"/>
<line antialias="false" x1="-10" y1="8" end2="none" length2="1.5" style="line-style:normal;line-weight:normal;filling:none;color:black" y2="10" length1="1.5" end1="none" x2="-10"/>
<polygon antialias="true" x1="-10" x3="-15" y3="-20" closed="false" y1="3" style="line-style:normal;line-weight:normal;filling:none;color:black" y2="0" x2="-10"/>
<line antialias="false" x1="-10" y1="8" end2="none" length2="1.5" style="line-style:normal;line-weight:normal;filling:none;color:black" y2="8" length1="1.5" end1="none" x2="-5"/>
<line antialias="false" x1="-5" y1="3" end2="none" length2="1.5" style="line-style:normal;line-weight:normal;filling:none;color:black" y2="8" length1="1.5" end1="none" x2="-5"/>
<line antialias="false" x1="-10" y1="3" end2="none" length2="1.5" style="line-style:normal;line-weight:normal;filling:none;color:black" y2="3" length1="1.5" end1="none" x2="-5"/>
<line antialias="false" x1="10" y1="16" end2="none" length2="1.5" style="line-style:normal;line-weight:normal;filling:none;color:black" y2="20" length1="1.5" end1="none" x2="10"/>
<polygon antialias="true" x1="10" x3="5" y3="-20" closed="false" y1="3" style="line-style:normal;line-weight:normal;filling:none;color:black" y2="0" x2="10"/>
<input tagg="label" size="9" x="16" y="-6.3334" text="_"/>
<arc antialias="true" angle="-180" x="6" height="5" style="line-style:normal;line-weight:normal;filling:none;color:black" width="8" start="90" y="10.5"/>
<line antialias="false" x1="-10" y1="-30" end2="none" length2="1.5" style="line-style:normal;line-weight:normal;filling:none;color:black" y2="-20" length1="1.5" end1="none" x2="-10"/>
<line antialias="false" x1="10" y1="8" end2="none" length2="1.5" style="line-style:normal;line-weight:normal;filling:none;color:black" y2="10" length1="1.5" end1="none" x2="10"/>
<line antialias="false" x1="10" y1="8" end2="none" length2="1.5" style="line-style:normal;line-weight:normal;filling:none;color:black" y2="8" length1="1.5" end1="none" x2="15"/>
<line antialias="false" x1="15" y1="3" end2="none" length2="1.5" style="line-style:normal;line-weight:normal;filling:none;color:black" y2="8" length1="1.5" end1="none" x2="15"/>
<line antialias="true" x1="-8" y1="-22" end2="none" length2="1.5" style="line-style:normal;line-weight:normal;filling:none;color:black" y2="-18" length1="1.5" end1="none" x2="-12"/>
<line antialias="false" x1="10" y1="3" end2="none" length2="1.5" style="line-style:normal;line-weight:normal;filling:none;color:black" y2="3" length1="1.5" end1="none" x2="15"/>
<line antialias="true" x1="-12" y1="-22" end2="none" length2="1.5" style="line-style:normal;line-weight:normal;filling:none;color:black" y2="-18" length1="1.5" end1="none" x2="-8"/>
<line antialias="false" x1="10" y1="-30" end2="none" length2="1.5" style="line-style:normal;line-weight:normal;filling:none;color:black" y2="-20" length1="1.5" end1="none" x2="10"/>
<line antialias="true" x1="12" y1="-22" end2="none" length2="1.5" style="line-style:normal;line-weight:normal;filling:none;color:black" y2="-18" length1="1.5" end1="none" x2="8"/>
<line antialias="true" x1="8" y1="-22" end2="none" length2="1.5" style="line-style:normal;line-weight:normal;filling:none;color:black" y2="-18" length1="1.5" end1="none" x2="12"/>
<terminal x="-10" orientation="n" y="-30"/>
<terminal x="10" orientation="s" y="20"/>
<terminal x="10" orientation="n" y="-30"/>
<terminal x="-10" orientation="s" y="20"/>
</description>
</definition>
</element>
</category>
</category>
</category>
</category>
</category>
</collection>
</project><properties> : some parts belong to header section of a dxf file
<newdiagrams>: if this the basic titelblock definition then i belong to the block section an will be used in the entitie section with a "INSERT" dxf type
<elements> : use in the entitie section with a "INSERT" dxf type
<shapes> : these will be directly used in the entitie section
<collection> : these will alle be placed into the block section and used in the entitie section with the "INSERT" dxf type
DXF coding exist of to lines i a dxf file, a code line and a value line:
code 10 (11-18) : x coordinate
code 20 (21-28) : y coordinate
code 30 (31-38) : z coordinate
For example a line :
10 : value : x start point
20 : value : y start point
11 : value : x end point
21 : value : y end point
Header section
0
SECTION
2
HEADER
9
$ACADVER
1
AC1015
9
$ACADMAINTVER
70
20
9
$DWGCODEPAGE
3
ANSI_1252
9
$INSBASE
10
0.0
20
0.0
30
0.0
9
$EXTMIN
10
-0.0000065245499172
20
-92.07012943410845
30
0.0
9
$EXTMAX
10
245.7932157966029
20
92.03646890741342
30
0.0
Every section starts with :
0
SECTION
2
HEADER
....
and ends with
0
ENDSEC
every header items starts with code 9 (only used in the header section)
9 : start code
$ACADVER : acad settings variable name
1 : Primary text value for an entity
AC1015 : value for code 1
9 : next start code for a acad settings variable
base point of a acad.dxf/dwg drawing (this must be in the export file)
9
$INSBASE
10 [color=#ff3333]: x reference[/color]
0.0 [color=#3333ff]: value of x[/color]
20 : [color=#ff3333]y reference[/color]
0.0 : [color=#3333ff]value of y[/color]
30 : [color=#ff3333]z reference[/color]
0.0 : [color=#3333ff]value of z[/color]
In DXF TABLES SECTION we need to create following tables :
BLOCK_RECORD (posible needed, have to checkout this table)
LAYER
LTYPE
Layer table
We created layers to separate qet sections:
Titelblock
Elements
Text
Shapes
....
Everithing of a titelblock wil be drawn on the layer "Titelblock" and so on for the other types.
LTYPE table
This table is used to converd the QET line types to acad line types
exportdxf.CPP
connectors will be transformet to points in DXF
0
SECTION
2
ENTITIES
0
POINT
8
0
10
111.9573116635928
20
4.929017205688296
30
0
6
Continuousthese points positions will be neded to convert the connector lines to dxf.
A symbol with connectors is insert at coordinates x,Y and the connector is relatief to these insert points (this is for both systems the same) so for drawing a line between to connectors we have to calculate the exact positions of the two connectors and the draw a polyline with 3 x,y points
0
LWPOLYLINE
5
31C1
330
1F
100
AcDbEntity
8
0
6
Continuous
100
AcDbPolyline
90
5
70
0
43
0.364575
10
111.9573116635928
20
4.929017205688296
10
116.9052366635928
20
4.929017205688296
10
116.9052366635928
20
-14.7584827943117
10
111.9573116635928
20
-14.7584827943117
10
111.9573116635928
20
4.929017205688296Like you can see we need tree times code 10 and 20 to define a polyline
