Create HappyNewYearText.cs

Author: chuongmep

Test/HappyNewYearText.cs

@@ -0,0 +1,117 @@
+using System;
+using Autodesk.AutoCAD.ApplicationServices.Core;
+using Autodesk.AutoCAD.Colors;
+using Autodesk.AutoCAD.DatabaseServices;
+using Autodesk.AutoCAD.EditorInput;
+using Autodesk.AutoCAD.Geometry;
+using Autodesk.AutoCAD.Runtime;
+
+namespace Test;
+
+public class HappyNewYearText
+{
+    [CommandMethod("HappyNewYear")]
+    public static void CreateHappyNewYear()
+    {
+        var doc = Application.DocumentManager.MdiActiveDocument;
+        var db = doc.Database;
+        var ed = doc.Editor;
+
+        // Pick insertion point
+        var insRes = ed.GetPoint("\nPick center point for text:");
+        if (insRes.Status != PromptStatus.OK) return;
+
+        // Ask for text height
+        var hOpts = new PromptDoubleOptions("\nText height:") { AllowNegative = false, AllowZero = false, DefaultValue = 20.0 };
+        var hRes = ed.GetDouble(hOpts);
+        if (hRes.Status != PromptStatus.OK) return;
+        double textHeight = hRes.Value;
+
+        // Ask for confetti count
+        var confOpts = new PromptIntegerOptions("\nConfetti count:") { LowerLimit = 0, UpperLimit = 500, DefaultValue = 60 };
+        var confRes = ed.GetInteger(confOpts);
+        if (confRes.Status != PromptStatus.OK) return;
+        int confettiCount = confRes.Value;
+
+        using (var tr = db.TransactionManager.StartTransaction())
+        {
+            // Ensure celebration layer exists
+            var lt = (LayerTable)tr.GetObject(db.LayerTableId, OpenMode.ForWrite);
+            string layerName = "Celebration";
+            if (!lt.Has(layerName))
+            {
+                var ltr = new LayerTableRecord { Name = layerName, Color = Color.FromColorIndex(ColorMethod.ByAci, 6) }; // magenta
+                lt.Add(ltr);
+                tr.AddNewlyCreatedDBObject(ltr, true);
+            }
+            db.Clayer = lt[layerName];
+
+            // Ensure text style exists (tries Arial Black; falls back to default)
+            var tst = (TextStyleTable)tr.GetObject(db.TextStyleTableId, OpenMode.ForWrite);
+            string styleName = "HNY_Style";
+            ObjectId styleId;
+            if (!tst.Has(styleName))
+            {
+                var tsr = new TextStyleTableRecord { Name = styleName, FileName = "Arial Black" };
+                tst.Add(tsr);
+                tr.AddNewlyCreatedDBObject(tsr, true);
+                styleId = tsr.ObjectId;
+            }
+            else
+            {
+                styleId = tst[styleName];
+            }
+
+            // Create MText with formatted content
+            var mt = new MText
+            {
+                Location = insRes.Value,
+                TextHeight = textHeight,
+                Attachment = AttachmentPoint.MiddleCenter,
+                TextStyleId = styleId,
+                Color = Color.FromColorIndex(ColorMethod.ByAci, 1) // red
+            };
+            // Use MText formatting codes: font bold and color changes
+            mt.Contents = "\\fArial Black|b1|i0;\\C1;Happy New Year!\\P\\C3;2026"; // red HNY, green year
+
+            var bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);
+            var ms = (BlockTableRecord)tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite);
+
+            ms.AppendEntity(mt);
+            tr.AddNewlyCreatedDBObject(mt, true);
+
+            // Try to compute extents to place confetti around
+            try
+            {
+                var ext = mt.GeometricExtents;
+                var min = ext.MinPoint;
+                var max = ext.MaxPoint;
+                // Expand bounds for confetti area
+                double margin = textHeight * 0.8;
+                min = new Point3d(min.X - margin, min.Y - margin, 0);
+                max = new Point3d(max.X + margin, max.Y + margin, 0);
+
+                var rand = new Random();
+                // Create confetti circles with random colors
+                for (int i = 0; i < confettiCount; i++)
+                {
+                    double x = min.X + rand.NextDouble() * (max.X - min.X);
+                    double y = min.Y + rand.NextDouble() * (max.Y - min.Y);
+                    double r = Math.Max(0.2, textHeight * (0.03 + 0.05 * rand.NextDouble()));
+                    var circ = new Circle(new Point3d(x, y, 0), Vector3d.ZAxis, r);
+                    short aci = (short)new int[] { 1, 2, 3, 4, 5, 6, 140, 30 }[rand.Next(8)];
+                    circ.Color = Color.FromColorIndex(ColorMethod.ByAci, aci);
+                    ms.AppendEntity(circ);
+                    tr.AddNewlyCreatedDBObject(circ, true);
+                }
+            }
+            catch
+            {
+                // If extents fail (rare), skip confetti gracefully
+                ed.WriteMessage("\nNote: Could not compute text extents for confetti placement.");
+            }
+
+            tr.Commit();
+        }
+    }
+}