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<title>Modify</title>
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<h1><a name="cmdModify"></a>2.2.7 Modify</h1>
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<img src="png.d/bmodify.png">
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<p>
The <strong>Modify</strong> command is used to change characteristics of or extend existing track by adding new track. This command works with any unconnected track endpoint.
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<p>
The <strong>Modify</strong> command can be invoked using the <strong>Change>Modify</strong> menu item, the <strong>Modify</strong> button or the menu raised by a <em>Right-Click</em> over the <strong>Main Canvas</strong>.
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<p>
Either the left mouse button (for changing length or creating a tangent track) or the right mouse button (for extending with a new track) is used to modify the unconnected endpoint.
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<p>
The endpoints of a <em>Line</em>, <em>Dimension Line</em>, <em>Table Edge</em> or <em>Bench-work</em> can be dragged to new positions. A <em>Box</em> is treated as 4 Lines.
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<p>
<em>Curved Lines</em> are modified in same manner as curved track.
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<p>
Selecting a corner of a <em>Poly Line</em>, <em>Filled Box</em> or <em>Polygon</em> moves that corner to a new position, and if moved close to a neighboring corner will merge the two corners and delete the edge between them. Selecting an edge will create a corner that can be dragged to a new position.
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<p>
Any tracks created during the <strong>Modify</strong> command will have the following properties inherited from the first track: selected state, hidden state, scale, track gauge and Layer.
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<p>
For detail about;
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<dl><dd>
Changing track length refer to <a href="chgTrackLength.html#chgTrackLength">Section 2.2.7.1</a>.
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<dl><dd>
Creating a tangent to a curve refer to <a href="createTangent.html#createTangent">Section 2.2.7.2</a>
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</p>
<dl><dd>
Changing track radius refer to <a href="chgTrackRadius.html#chgTrackRadius">Section 2.2.7.3</a>
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<p>
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<dl><dd>
Extending track length refer to <a href="extendTrack.html#extendTrack">Section 2.2.7.4</a>
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<hr>
<ul>
<li><a href="chgTrackLength.html#chgTrackLength">2.2.7.1 Changing Track Length</a></li>
<li><a href="createTangent.html#createTangent">2.2.7.2 Creating a Tangent to a Curve</a></li>
<li><a href="chgTrackRadius.html#chgTrackRadius">2.2.7.3 Changing Track Radius</a></li>
<li><a href="extendTrack.html#extendTrack">2.2.7.4 Extending Track Length</a></li>
</ul>
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