CadParamPluging/Cad/HalfSectionDrawer.cs

using System;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
using CadParamPluging.Common;

namespace CadParamPluging.Cad
{
    public static class HalfSectionDrawer
    {
        public static void Draw(CadContext ctx, ParamBag bag, string deliveryStatus, string structuralFeature)
        {
            if (ctx == null)
            {
                throw new ArgumentNullException(nameof(ctx));
            }

            if (bag == null)
            {
                throw new ArgumentNullException(nameof(bag));
            }

            if (IsRing(structuralFeature))
            {
                DrawRing(ctx, bag, deliveryStatus);
            }
            else if (IsDisk(structuralFeature))
            {
                // 后续实现
            }
            else if (IsShaft(structuralFeature))
            {
                // 后续实现
            }
            else if (IsBlock(structuralFeature))
            {
                // 后续实现
            }
        }

        private static bool IsRing(string feature)
        {
            return !string.IsNullOrWhiteSpace(feature)
                && feature.IndexOf("环形", StringComparison.OrdinalIgnoreCase) >= 0;
        }

        private static bool IsDisk(string feature)
        {
            return !string.IsNullOrWhiteSpace(feature)
                && (feature.IndexOf("饼盘", StringComparison.OrdinalIgnoreCase) >= 0
                    || feature.IndexOf("饼", StringComparison.OrdinalIgnoreCase) >= 0
                    || feature.IndexOf("盘", StringComparison.OrdinalIgnoreCase) >= 0);
        }

        private static bool IsShaft(string feature)
        {
            return !string.IsNullOrWhiteSpace(feature)
                && (feature.IndexOf("轴杆", StringComparison.OrdinalIgnoreCase) >= 0
                    || feature.IndexOf("轴", StringComparison.OrdinalIgnoreCase) >= 0
                    || feature.IndexOf("杆", StringComparison.OrdinalIgnoreCase) >= 0);
        }

        private static bool IsBlock(string feature)
        {
            return !string.IsNullOrWhiteSpace(feature)
                && feature.IndexOf("方体", StringComparison.OrdinalIgnoreCase) >= 0;
        }

        private static bool IsMachined(string deliveryStatus)
        {
            return !string.IsNullOrWhiteSpace(deliveryStatus)
                && deliveryStatus.IndexOf("车加工", StringComparison.OrdinalIgnoreCase) >= 0;
        }

        private static void DrawRing(CadContext ctx, ParamBag bag, string deliveryStatus)
        {
            var db = ctx.Database;
            var tr = ctx.Transaction;
            var btr = (BlockTableRecord)tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite);

            // 读取尺寸
            double outerDia = bag.GetDouble("OuterDiameter1");
            double innerDia = bag.GetDouble("InnerDiameter2");
            double height = bag.GetDouble("Height1");

            if (outerDia <= 0 || height <= 0)
            {
                return;
            }

            // 绘制水平圆柱 (侧视图)
            // 中心线 (X轴) - 已移除，以匹配参考图样式

            // 1. 锻件外轮廓
            double R = outerDia / 2.0;
            var polyForging = new Polyline();
            polyForging.AddVertexAt(0, new Point2d(0, -R), 0, 0, 0);
            polyForging.AddVertexAt(1, new Point2d(height, -R), 0, 0, 0);
            polyForging.AddVertexAt(2, new Point2d(height, R), 0, 0, 0);
            polyForging.AddVertexAt(3, new Point2d(0, R), 0, 0, 0);
            polyForging.Closed = true;
            polyForging.ColorIndex = 7; // 白色

            btr.AppendEntity(polyForging);
            tr.AddNewlyCreatedDBObject(polyForging, true);

            // 3. 内孔轮廓 (虚线)
            if (innerDia > 0)
            {
                double r = innerDia / 2.0;
                TryLoadLinetype(db, tr, "DASHED");

                var lineHiddenTop = new Line(new Point3d(0, r, 0), new Point3d(height, r, 0));
                lineHiddenTop.ColorIndex = 2; // 黄色
                lineHiddenTop.Linetype = "DASHED";
                btr.AppendEntity(lineHiddenTop);
                tr.AddNewlyCreatedDBObject(lineHiddenTop, true);

                var lineHiddenBot = new Line(new Point3d(0, -r, 0), new Point3d(height, -r, 0));
                lineHiddenBot.ColorIndex = 2; 
                lineHiddenBot.Linetype = "DASHED";
                btr.AppendEntity(lineHiddenBot);
                tr.AddNewlyCreatedDBObject(lineHiddenBot, true);
                
                // 内孔标注
                AddLinearDim(db, tr, btr, new Point3d(0, r, 0), new Point3d(0, -r, 0), 
                    new Point3d(height + 15, 0, 0), 90, $"%%c{innerDia}");
            }

            // 外径标注
            AddLinearDim(db, tr, btr, new Point3d(0, R, 0), new Point3d(0, -R, 0), 
                new Point3d(-15, 0, 0), 90, $"%%c{outerDia}");
            
            // 长度标注
            AddLinearDim(db, tr, btr, new Point3d(0, -R, 0), new Point3d(height, -R, 0), 
                new Point3d(height / 2, -R - 15, 0), 0, $"{height}min");

            // 4. 车加工零件 (填充)
            if (IsMachined(deliveryStatus))
            {
                double outerDiaPrime = bag.GetDouble("OuterDiameter1Prime");
                double innerDiaPrime = bag.GetDouble("InnerDiameter2Prime");
                double heightPrime = bag.GetDouble("Height1Prime");

                if (outerDiaPrime > 0 && heightPrime > 0)
                {
                    double offsetX = (height - heightPrime) / 2.0;
                    double Rp = outerDiaPrime / 2.0;
                    
                    // 零件轮廓
                    var polyPart = new Polyline();
                    polyPart.AddVertexAt(0, new Point2d(offsetX, -Rp), 0, 0, 0);
                    polyPart.AddVertexAt(1, new Point2d(offsetX + heightPrime, -Rp), 0, 0, 0);
                    polyPart.AddVertexAt(2, new Point2d(offsetX + heightPrime, Rp), 0, 0, 0);
                    polyPart.AddVertexAt(3, new Point2d(offsetX, Rp), 0, 0, 0);
                    polyPart.Closed = true;
                    polyPart.ColorIndex = 7;

                    btr.AppendEntity(polyPart);
                    tr.AddNewlyCreatedDBObject(polyPart, true);

                    // 填充
                    try
                    {
                        var hatch = new Hatch();
                        hatch.SetDatabaseDefaults();
                        hatch.Normal = new Vector3d(0, 0, 1);
                        hatch.Elevation = 0.0;

                        btr.AppendEntity(hatch);
                        tr.AddNewlyCreatedDBObject(hatch, true);

                        hatch.SetHatchPattern(HatchPatternType.PreDefined, "ANSI31");
                        hatch.PatternScale = 5.0;
                        hatch.Associative = true;
                        hatch.ColorIndex = 4;

                        var ids = new ObjectIdCollection();
                        ids.Add(polyPart.ObjectId);
                        hatch.AppendLoop(HatchLoopTypes.External, ids);
                        hatch.EvaluateHatch(true);
                    }
                    catch
                    {
                        // 忽略
                    }
                    
                    // 可以在这里添加零件尺寸标注
                    AddLinearDim(db, tr, btr, new Point3d(offsetX, Rp, 0), new Point3d(offsetX, -Rp, 0), 
                         new Point3d(offsetX - 5, 0, 0), 90, $"%%c{outerDiaPrime}");

                    AddLinearDim(db, tr, btr, new Point3d(offsetX, -Rp, 0), new Point3d(offsetX + heightPrime, -Rp, 0),
                        new Point3d(offsetX + heightPrime / 2, -Rp - 10, 0), 0, $"{heightPrime}");
                }
            }
        }

        private static void AddLinearDim(Database db, Transaction tr, BlockTableRecord btr, 
            Point3d pt1, Point3d pt2, Point3d dimLinePt, double rotationDeg, string textOverride)
        {
            try
            {
                double rotRad = rotationDeg * Math.PI / 180.0;
                var dim = new RotatedDimension(rotRad, pt1, pt2, dimLinePt, textOverride, db.Dimstyle);
                dim.ColorIndex = 4; // 青色
                btr.AppendEntity(dim);
                tr.AddNewlyCreatedDBObject(dim, true);
            }
            catch
            {
                // 忽略标注错误
            }
        }

        private static void TryLoadLinetype(Database db, Transaction tr, string linetypeName)
        {
            try
            {
                var linetypeTbl = (LinetypeTable)tr.GetObject(db.LinetypeTableId, OpenMode.ForRead);
                if (!linetypeTbl.Has(linetypeName))
                {
                    try
                    {
                        db.LoadLineTypeFile(linetypeName, "acad.lin");
                    }
                    catch
                    {
                        // 忽略
                    }
                }
            }
            catch
            {
                // 忽略
            }
        }
    }
}