Tolerance容差类在点或向量比较时的应用示例
public static void Test()
{
var db = HostApplicationServices.WorkingDatabase;
var doc = Application.DocumentManager.GetDocument(db);
var ed = doc.Editor;
Point3d pt1 = new Point3d(0, 0.0001, 0);
Point3d pt2 = new Point3d(0, 0, 0);
ed.WriteMessage(
"\nEqualPoint:{0}\nEqualVector:{1}",
Tolerance.Global.EqualPoint,
Tolerance.Global.EqualVector);
ed.WriteMessage("\npt1 == pt2 is {0}", pt1 == pt2);
Tolerance oldtol = Tolerance.Global;
Tolerance.Global = new Tolerance(0.01, 0.01);
ed.WriteMessage(
"\nEqualPoint:{0}\nEqualVector:{1}",
Tolerance.Global.EqualPoint,
Tolerance.Global.EqualVector);
ed.WriteMessage("\npt1 == pt2 is {0}", pt1 == pt2);
Tolerance.Global = oldtol;
}运行结果
命令: tt
EqualPoint:1E-10
EqualVector:1E-12
pt1 == pt2 is False
EqualPoint:0.01
EqualVector:0.01
pt1 == pt2 is True <p>点或向量在比较时，应用到了容差类的两个数值，实际使用时不需要重写这方面的方法</p><p>只需设置容差，然后直接判断就OK了</p><p>帮助文档中的相关内容</p><p class="Element10">This is an instantiable class that is by default initialized to the default tolerances. Subsequently, the tolerances within it can be customized to suit a specific need. For example, an instance of this class may be specialized for use during surface intersection. </p><p class="Element10"></p><p class="Element10">Class Tolerance keeps two properties, EqualPoint and EqualVector, which are used in evaluation according to the following rules: </p><p class="Element10"></p><ol class="Element630"><li class="Element600" value="1">Two points, p1 and p2, are equal if </li></ol><p>
</p><p></p><div class="Element103"><div class="Element102"><pre class="Element102" style="FONT-FAMILY: Verdana,Arial,Helvetica,sans-serif;">(p1 - p2).length() <= equalPoint</pre></div></div><p class="Element10"></p><ol class="Element630"><li class="Element600" value="2">Two vectors, v1 and v2, are equal if </li></ol><p></p><div class="Element103"><div class="Element102"><pre class="Element102" style="FONT-FAMILY: Verdana,Arial,Helvetica,sans-serif;">(v1 - v2).length() <= equalVector</pre></div></div><p class="Element10"></p><ol class="Element630"><li class="Element600" value="3">Two vectors, v1 and v2, are parallel if </li></ol><p></p><div class="Element103"><div class="Element102"><pre class="Element102" style="FONT-FAMILY: Verdana,Arial,Helvetica,sans-serif;">(v1/v1.length() - v2/v2.length() ).length() < equalVector</pre></div></div><p class="Element10">OR </p><div class="Element103"><div class="Element102"><pre class="Element102" style="FONT-FAMILY: Verdana,Arial,Helvetica,sans-serif;">(v1/v1.length() + v2/v2.length() ).length() < equalVector</pre></div></div><p class="Element10"></p><ol class="Element630"><li class="Element600" value="4">Two vectors, v1 and v2, are perpendicular if </li></ol><p></p><div class="Element103"><div class="Element102"><pre class="Element102" style="FONT-FAMILY: Verdana,Arial,Helvetica,sans-serif;">abs((v1.dotProduct(v2))/(v1.length()*v2.length())) <= equalVector</pre></div></div><p class="Element10"></p><ol class="Element630"><li class="Element600" value="5">Two lines or rays are parallel (perpendicular) if their directional vectors are parallel (perpendicular) </li></ol><p></p><a name="4E6F746573"></a><div class="Element14"></div> <p>收到</p> Point3d pt1 = new Point3d(0, 0.0001, 0);
Point3d pt2 = new Point3d(0, 0, 0);
ed.WriteMessage(
"\nEqualPoint:{0}\nEqualVector:{1}",
Tolerance.Global.EqualPoint,
Tolerance.Global.EqualVector);
这一句话还不是很明白， Tolerance.Global.EqualPoint,Tolerance.Global.EqualVector 的作用最不清楚。 谢谢!!学习了... 原来有个Tolerance.Global并可写的，之前不知道，学习了，谢谢斑竹！
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