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Add an option to export symbols as DXF blocks (#1339)

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With "DXF : symboles en blocs" ticked in the export dialog, or
--dxf-blocks on the command line, each symbol definition a folio uses is
written once as a DXF block and every placed symbol as an INSERT of it.
A CAD program then selects, counts and replaces a symbol as one object.

The block is drawn by the same code as a symbol drawn in full, as if
the symbol sat unturned at the folio's origin, which is DXF (0,
sheetHeight): that is the block's base point, so the INSERT carries the
symbol's position and quarter-turn and nothing else. Blocks have to come
before any entity, so the export collects them first and dxfBegin()
writes them in its BLOCKS section. Entities in a block keep their own
layers. Off by default; with it off the file is unchanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
ispyisail
2026-10-07 09:50:18 +13:00
parent 83f72c95c6
commit c3ed2daca8
12 changed files with 567 additions and 115 deletions
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sources/createdxf.cpp
+156 -2
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@@ -68,7 +68,16 @@ Createdxf::~Createdxf()
/* Header section of every DXF file.
@param layers : the layers the entities will be written on, declared in
the LAYER table beside layer "0", which every DXF has. */
void Createdxf::dxfBegin (const QString& fileName, const QStringList &layers)
/**
@brief Createdxf::dxfBegin
Write the header, the tables with @a layers, and the BLOCKS section,
then open the ENTITIES section. @a writeBlocks, if given, is called
inside the BLOCKS section to write the block definitions
(dxfBlockBegin(), the entities, dxfBlockEnd()): a block has to be
defined before any entity, so before anything is drawn.
*/
void Createdxf::dxfBegin (const QString& fileName, const QStringList &layers,
const std::function<void()> &writeBlocks)
{
layer = QStringLiteral("0");
@@ -276,17 +285,162 @@ void Createdxf::dxfBegin (const QString& fileName, const QStringList &layers)
To_Dxf << "SECTION" << "\r\n";
To_Dxf << 2 << "\r\n";
To_Dxf << "BLOCKS" << "\r\n";
file.close();
}
if (writeBlocks)
writeBlocks();
QFile entities(fileName);
if (entities.open(QFile::Append)) {
QTextStream To_Dxf(&entities);
To_Dxf << 0 << "\r\n";
To_Dxf << "ENDSEC" << "\r\n";
To_Dxf << 0 << "\r\n";
To_Dxf << "SECTION" << "\r\n";
To_Dxf << 2 << "\r\n";
To_Dxf << "ENTITIES" << "\r\n";
file.close();
entities.close();
}
}
}
/**
@brief Createdxf::dxfBlockBegin
Start the definition of block @a name, with its base point at @a x,
@a y. Only inside dxfBegin()'s writeBlocks; every entity written until
dxfBlockEnd() belongs to the block.
@param hasAttributes : the block has attribute definitions
*/
void Createdxf::dxfBlockBegin(const QString &fileName,
const QString &name,
double x,
double y,
bool hasAttributes)
{
QFile file(fileName);
if (!file.open(QFile::Append))
return;
QTextStream To_Dxf(&file);
To_Dxf << 0 << "\r\n";
To_Dxf << "BLOCK" << "\r\n";
To_Dxf << 8 << "\r\n";
To_Dxf << "0" << "\r\n";
To_Dxf << 2 << "\r\n";
To_Dxf << name << "\r\n";
To_Dxf << 70 << "\r\n";
To_Dxf << (hasAttributes ? 2 : 0) << "\r\n";
To_Dxf << 10 << "\r\n";
To_Dxf << x << "\r\n";
To_Dxf << 20 << "\r\n";
To_Dxf << y << "\r\n";
To_Dxf << 30 << "\r\n";
To_Dxf << 0.0 << "\r\n";
file.close();
}
/**
@brief Createdxf::dxfBlockEnd
End the block started by dxfBlockBegin().
*/
void Createdxf::dxfBlockEnd(const QString &fileName)
{
QFile file(fileName);
if (!file.open(QFile::Append))
return;
QTextStream To_Dxf(&file);
To_Dxf << 0 << "\r\n";
To_Dxf << "ENDBLK" << "\r\n";
To_Dxf << 8 << "\r\n";
To_Dxf << "0" << "\r\n";
file.close();
}
/**
@brief Createdxf::drawInsert
Place block @a name at @a x, @a y, turned counter-clockwise by
@a rotation degrees, on the current layer, followed by its
@a attributes.
*/
void Createdxf::drawInsert(const QString &fileName,
const QString &name,
double x,
double y,
double rotation,
const QList<Attribute> &attributes)
{
QFile file(fileName);
if (!file.open(QFile::Append))
return;
QTextStream To_Dxf(&file);
To_Dxf << 0 << "\r\n";
To_Dxf << "INSERT" << "\r\n";
To_Dxf << 8 << "\r\n";
To_Dxf << layer << "\r\n";
if (!attributes.isEmpty()) {
To_Dxf << 66 << "\r\n";
To_Dxf << 1 << "\r\n";
}
To_Dxf << 2 << "\r\n";
To_Dxf << name << "\r\n";
To_Dxf << 10 << "\r\n";
To_Dxf << x << "\r\n";
To_Dxf << 20 << "\r\n";
To_Dxf << y << "\r\n";
To_Dxf << 30 << "\r\n";
To_Dxf << 0.0 << "\r\n";
To_Dxf << 50 << "\r\n";
To_Dxf << rotation << "\r\n";
for (const Attribute &attribute : attributes) {
To_Dxf << 0 << "\r\n";
To_Dxf << "ATTRIB" << "\r\n";
To_Dxf << 8 << "\r\n";
To_Dxf << layer << "\r\n";
To_Dxf << 62 << "\r\n";
To_Dxf << entityColour(attribute.colour) << "\r\n";
To_Dxf << 10 << "\r\n";
To_Dxf << attribute.x << "\r\n";
To_Dxf << 20 << "\r\n";
To_Dxf << attribute.y << "\r\n";
To_Dxf << 30 << "\r\n";
To_Dxf << 0.0 << "\r\n";
To_Dxf << 40 << "\r\n";
To_Dxf << attribute.height << "\r\n";
To_Dxf << 1 << "\r\n";
To_Dxf << singleLine(attribute.text) << "\r\n";
To_Dxf << 2 << "\r\n";
To_Dxf << attribute.tag << "\r\n";
To_Dxf << 70 << "\r\n";
To_Dxf << (attribute.invisible ? 1 : 0) << "\r\n";
To_Dxf << 50 << "\r\n";
To_Dxf << attribute.rotation << "\r\n";
To_Dxf << 41 << "\r\n";
To_Dxf << attribute.xScaleW << "\r\n";
}
if (!attributes.isEmpty()) {
To_Dxf << 0 << "\r\n";
To_Dxf << "SEQEND" << "\r\n";
To_Dxf << 8 << "\r\n";
To_Dxf << layer << "\r\n";
}
file.close();
}
/**
@brief Createdxf::blockName
@return @a name as a block or attribute name an R10 reader accepts:
upper case, only A-Z, 0-9, _, - and $, at most 31 characters
*/
QString Createdxf::blockName(const QString &name)
{
QString result;
for (const QChar c : name.toUpper()) {
const ushort u = c.unicode();
const bool ok = (u >= 'A' && u <= 'Z') || (u >= '0' && u <= '9')
|| u == '_' || u == '-' || u == '$';
result += ok ? c : QChar('_');
}
return result.left(31);
}
/**
@brief Createdxf::dxfEnd
End Section of every DXF File