RevitAPI: Revit中求兩條直線的夾角XYZ.AngleTo

有時候我們并不知道一個函數可能會有什麼行為，例如XYZ.AngleTo的傳回值是0-2π還是0-π，又找不到對應的文檔，那就幹脆自己動手測試一下了，代碼如下：

Line line1 = Line.CreateBound(new XYZ(0, 0, 0), new XYZ(10, 0, 0));
Line line2 = Line.CreateBound(new XYZ(0, 0, 0), new XYZ(0, 10, 0));    // L
Line line3 = Line.CreateBound(new XYZ(0, 0, 0), new XYZ(-10, 10, 0));  // \-
Line line4 = Line.CreateBound(new XYZ(0, 0, 0), new XYZ(-10, -10, 0)); // /-
Line line5 = Line.CreateBound(new XYZ(0, 0, 0), new XYZ(-10, 0, 0));   // --
Line line6 = Line.CreateBound(new XYZ(0, 0, 0), new XYZ(0, 10, 0));    // |-
Line line7 = Line.CreateBound(new XYZ(0, 10, 0), new XYZ(10, 10, 0));  // =
double angle;
angle = line1.Direction.AngleTo(line2.Direction);
Trace.WriteLine(angle);
angle = line1.Direction.AngleTo(line3.Direction);
Trace.WriteLine(angle);
angle = line1.Direction.AngleTo(line4.Direction);
Trace.WriteLine(angle);
angle = line1.Direction.AngleTo(line5.Direction);
Trace.WriteLine(angle);
angle = line1.Direction.AngleTo(line6.Direction);
Trace.WriteLine(angle);
angle = line1.Direction.AngleTo(line7.Direction);
Trace.WriteLine(angle);
           

輸出值是：

1.5707963267949

2.35619449019234

2.35619449019234

3.14159265358979

1.5707963267949

用圖形表示就是這樣