IO_DXF: WIP1

Author: HuguesDelorme

src/io_dxf/dxf.cpp

@@ -0,0 +1,43 @@
+/****************************************************************************
+** Copyright (c) 2026, Fougue Ltd. <https://www.fougue.pro>
+** All rights reserved.
+** See license at https://github.com/fougue/mayo/blob/master/LICENSE.txt
+****************************************************************************/
+
+#pragma once
+
+#include <functional>
+#include <variant>
+
+#include "dxf_format_common.h"
+
+struct Dxf_3DFACE;
+struct Dxf_ARC;
+struct Dxf_CIRCLE;
+struct Dxf_ELLIPSE;
+struct Dxf_INSERT;
+struct Dxf_LINE;
+struct Dxf_LWPOLYLINE;
+struct Dxf_MTEXT;
+struct Dxf_POINT;
+struct Dxf_POLYLINE;
+struct Dxf_SOLID;
+struct Dxf_SPLINE;
+struct Dxf_TEXT;
+
+using Dxf_EntityVariant = std::variant<
+    std::monostate,
+    std::reference_wrapper<const Dxf_3DFACE>,
+    std::reference_wrapper<const Dxf_ARC>,
+    std::reference_wrapper<const Dxf_CIRCLE>,
+    std::reference_wrapper<const Dxf_ELLIPSE>,
+    std::reference_wrapper<const Dxf_INSERT>,
+    std::reference_wrapper<const Dxf_LINE>,
+    std::reference_wrapper<const Dxf_LWPOLYLINE>,
+    std::reference_wrapper<const Dxf_MTEXT>,
+    std::reference_wrapper<const Dxf_POINT>,
+    std::reference_wrapper<const Dxf_POLYLINE>,
+    std::reference_wrapper<const Dxf_SOLID>,
+    std::reference_wrapper<const Dxf_SPLINE>,
+    std::reference_wrapper<const Dxf_TEXT>
+>;

src/io_dxf/dxf.h

@@ -0,0 +1,29 @@
+/****************************************************************************
+** Copyright (c) 2026, Fougue Ltd. <https://www.fougue.pro>
+** All rights reserved.
+** See license at https://github.com/fougue/mayo/blob/master/LICENSE.txt
+****************************************************************************/
+
+#pragma once
+
+#include "dxf_entity_variant.h"
+#include "dxf_format_common.h"
+
+#include <vector>
+
+struct Dxf_BLOCK {
+    // Code: 2 or 3
+    DxfStringRef name;
+    // Code: 8
+    DxfStringRef layerName;
+    // Code: 10, 20, 30
+    DxfCoords basePoint = {};
+    // Code: 70
+    unsigned flags = 0;
+    // Code: 1
+    DxfStringRef xrefPathName;
+    // Code: 4
+    DxfStringRef description;
+
+    std::vector<Dxf_EntityVariant> entities;
+};

src/io_dxf/dxf_entity_variant.h

@@ -0,0 +1,62 @@
+/****************************************************************************
+** Copyright (c) 2026, Fougue Ltd. <https://www.fougue.pro>
+** All rights reserved.
+** See license at https://github.com/fougue/mayo/blob/master/LICENSE.txt
+****************************************************************************/
+
+#pragma once
+
+#include <string_view>
+
+enum class DxfUnit {
+    Unspecified = 0,   // Unspecified (No units)
+    Inches,
+    Feet,
+    Miles,
+    Millimeters,
+    Centimeters,
+    Meters,
+    Kilometers,
+    Microinches,
+    Mils,
+    Yards,
+    Angstroms,
+    Nanometers,
+    Microns,
+    Decimeters,
+    Dekameters,
+    Hectometers,
+    Gigameters,
+    AstronomicalUnits,
+    LightYears,
+    Parsecs
+};
+
+enum class DxfVersion {
+    RUnknown,
+    ROlder,
+    R10,
+    R11_12,
+    R13,
+    R14,
+    R2000,
+    R2004,
+    R2007,
+    R2010,
+    R2013,
+    R2018,
+    RNewer
+};
+
+struct DxfCoords {
+    double x; double y; double z;
+};
+
+struct DxfScale {
+    double x; double y; double z;
+};
+
+using DxfStringRef = std::string_view;
+using DxfColorIndex = int;
+constexpr DxfColorIndex dxfColorByLayer = 256;
+constexpr DxfColorIndex dxfColorByBlock = 0;