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<title>Render Topology | HiAPI-C# 2025 </title>
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<h1 id="render-topology">Render Topology</h1>
<p>Read <a href="../Topo/index.html">Kinematic Topology</a> <a href="../../rendering/index.html">Rendering</a> for the prerequisite.</p>
<p>A <a class="xref" href="../../../../api/Hi.Mech.Topo.Asmb.html">Asmb</a> is a group to render its descendent <a class="xref" href="../../../../api/Hi.Mech.Topo.Anchor.html">Anchor</a>s.</p>
<p>Several ways to render with the topology:</p>
<ul>
<li>Render by Anchoring Matrix Map</li>
<li>Render by Anchored Displayee</li>
</ul>
<h2 id="render-by-anchoring-matrix-map">Render by Anchoring Matrix Map</h2>
<h2 id="render-by-anchored-displayee">Render by Anchored Displayee</h2>
<p>Inherit <a class="xref" href="../../../../api/Hi.Mech.Topo.IAnchoredDisplayee.html">IAnchoredDisplayee</a> or apply <a class="xref" href="../../../../api/Hi.Mech.Topo.AnchoredDisplayee.html">AnchoredDisplayee</a> to <a class="xref" href="../../../../api/Hi.Mech.Topo.Asmb.html">Asmb</a>.Display().</p>
<p>Inherit <a class="xref" href="../../../../api/Hi.Mech.Topo.ITopoDisplayee.html">ITopoDisplayee</a> to manage the object with <a class="xref" href="../../../../api/Hi.Mech.Topo.Asmb.html">Asmb</a> and plural anchors .</p>
<p>The base logic is also by the anchoring matrix. Here is some class and function wrapping the logic.</p>
<p>The sample code shows the topology rendering for a <a class="xref" href="../../../../api/Hi.Milling.MillingTools.MillingTool.html">MillingTool</a> editing helper:</p>
<pre><code class="lang-csharp" name="MillingToolEditorDisplayee">using Hi.Common;
using Hi.Common.Messages;
using Hi.Disp;
using Hi.Disp.Flag;
using Hi.Geom;
using Hi.Mech.Topo;
using Hi.Milling.Cutters;
using Hi.NcMech.Holders;
using System;
using System.Collections.Generic;
namespace Hi.Milling.MillingTools
{
/// &lt;summary&gt;
/// Display host for a milling tool composed of a cutter and a holder.
/// &lt;/summary&gt;
public class MillingToolEditorDisplayee : ITopoDisplayee, IClearCache
{
/// &lt;summary&gt;
/// Gets or sets the delegate that provides the &lt;see cref=&quot;MillingTool&quot;/&gt; instance.
/// &lt;/summary&gt;
public Func&lt;MillingTool&gt; MillingToolGetter { get; set; }
/// &lt;summary&gt;
/// Gets the current &lt;see cref=&quot;MillingTool&quot;/&gt; instance.
/// &lt;/summary&gt;
public MillingTool MillingTool =&gt; MillingToolGetter?.Invoke();
/// &lt;summary&gt;
/// Gets or sets whether to show the cutter.
/// &lt;/summary&gt;
public bool ShowCutter { get; set; } = true;
/// &lt;summary&gt;
/// Gets or sets whether to show the holder.
/// &lt;/summary&gt;
public bool ShowHolder { get; set; } = true;
/// &lt;summary&gt;
/// Gets the displayee for the milling cutter.
/// &lt;/summary&gt;
public MillingCutterEditorDisplayee MillingCutterEditorDisplayee { get; }
= new MillingCutterEditorDisplayee();
/// &lt;summary&gt;
/// Gets the displayee for the holder.
/// &lt;/summary&gt;
public HolderEditorDisplayee HolderEditorDisplayee { get; }
= new HolderEditorDisplayee();
/// &lt;inheritdoc/&gt;
public List&lt;IAnchoredDisplayee&gt; GetAnchoredDisplayeeList()
{
var dst = new List&lt;IAnchoredDisplayee&gt;();
var millingTool = MillingTool;
if (millingTool == null)
return dst;
if (ShowCutter)
{
var cutter = millingTool.Cutter;
if (cutter is MillingCutter millingCutter)
{
//MessageKit.AddMessage($&quot;MillingTool.Cutter: {MillingTool?.Cutter?.GetHashCode()}&quot;);
MillingCutterEditorDisplayee.MillingCutterSourceFunc
= () =&gt; MillingTool?.Cutter as MillingCutter;
dst.Add(MillingCutterEditorDisplayee);
}
else if(cutter!=null)
dst.Add(cutter);
}
if (ShowHolder)
{
HolderEditorDisplayee.Holder = millingTool.Holder;
dst.Add(HolderEditorDisplayee);
}
return dst;
}
/// &lt;inheritdoc/&gt;
public void Display(Bind bind)
{
bind.PushCoveringPixelMode();
DimensionBar.Display(bind, &quot;mm&quot;);
bind.ModelMatStack.Pop();
TopoDisplayeeUtil.Display(this, bind);
}
/// &lt;inheritdoc/&gt;
public void ExpandToBox3d(Box3d dst)
{
TopoDisplayeeUtil.ExpandToBox3d(this, dst);
}
/// &lt;inheritdoc/&gt;
public Asmb GetAsmb() =&gt; MillingTool?.Asmb;
/// &lt;inheritdoc/&gt;
public Anchor GetAnchor() =&gt; MillingTool?.GetAnchor();
/// &lt;inheritdoc/&gt;
public void ClearCache()
{
MillingCutterEditorDisplayee?.ClearCache();
}
}
}
</code></pre>
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