茂之钳
4f75bb8b07
Add IGES v5.3 export for B-Rep models with: - Entity mapping: Point(116), Line(110), Circular Arc(100), B-Spline Curve(126), Plane(108), B-Spline Surface(128), Vertex(502), Edge(504), Loop(508), Face(510), Shell(514), Manifold Solid B-Rep(186) - Auto-detection of circular arcs (degree-2 NURBS with isosceles control triangle) and planes (1x1 degree surfaces) - Fixed 80-column IGES format with S/G/D/P/T sections - Header-only format_utils.h for IGES/STEP number formatting New files: - include/vde/foundation/format_utils.h - include/vde/brep/iges_export.h - src/brep/iges_export.cpp - tests/brep/test_iges_export.cpp
60 lines
1.8 KiB
C++
60 lines
1.8 KiB
C++
#pragma once
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#include "vde/core/point.h"
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#include <string>
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#include <sstream>
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#include <iomanip>
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#include <cmath>
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#include <cstdio>
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namespace vde::foundation {
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/// Format double with adequate precision for CAD (12 significant digits)
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inline std::string fmt_double(double v, int precision = 12) {
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if (std::isnan(v)) return "0.0";
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if (std::isinf(v)) return v > 0 ? "1e30" : "-1e30";
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std::ostringstream ss;
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ss << std::setprecision(precision) << std::scientific << v;
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std::string s = ss.str();
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// Ensure always has exponent sign (e.g., "1.0e+00" not "1.0e00")
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auto epos = s.find('e');
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if (epos != std::string::npos) {
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if (epos + 1 < s.size() && s[epos + 1] != '-' && s[epos + 1] != '+') {
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s.insert(epos + 1, "+");
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}
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}
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return s;
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}
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/// Format for IGES: uses D exponent
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inline std::string fmt_iges_real(double v) {
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auto s = fmt_double(v, 12);
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auto pos = s.find('e');
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if (pos != std::string::npos) s[pos] = 'D';
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return s;
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}
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/// Format a Point3D as comma-separated reals
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inline std::string fmt_point(const core::Point3D& p, bool use_d = false) {
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auto fmt = use_d ? fmt_iges_real : fmt_double;
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return fmt(p.x()) + "," + fmt(p.y()) + "," + fmt(p.z());
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}
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/// Pad a string to exactly 72 characters with spaces
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inline std::string pad72(const std::string& s) {
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std::string result = s;
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if (result.size() > 72) result.resize(72);
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result.resize(72, ' ');
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return result;
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}
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/// Format an IGES section line: data + section marker (80 columns total)
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inline std::string format_iges_line(const std::string& data, char section_char, int seq) {
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std::string line = pad72(data);
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char seq_buf[9];
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std::snprintf(seq_buf, sizeof(seq_buf), "%c%07d", section_char, seq);
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line += std::string(seq_buf);
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return line + "\n";
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}
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} // namespace vde::foundation
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