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Docs: LazUtils/graphmath. Adds missing content for the overloaded Distance function.

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dsiders 2024-08-28 01:15:36 +01:00
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docs/xml/lazutils/graphmath.xml
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@ -501,20 +501,67 @@ Zero degrees is at the 3 o'clock position.
<element name="Distance"> <element name="Distance">
<short> <short>
Get the <var>Distance</var> between any two Points. It is primarily for use Gets the distance between two points, or the distance of a point from a
in other routines such as EccentricAngle. specified line.
</short> </short>
<descr/> <descr>
<p>
<var>Distance</var> is an overloaded function with variants that operate on
either two TPoint coordinates, or on a point (TFloatPoint) and a line defined
by two additional points (TFloatPoint) values. The Distance() function is used
primarily for internal purposes (such as in Bezier2PolyLine and EccentricAngle)
but can be used for any purpose.
</p>
<p>
The return value is an Extended type with the calculated distance between the
argument values.
</p>
<p>
The variant using TPoint arguments calculates the length of a straight line
between the coordinates in PT1 and PT2 using the Pythagorean theorem. The
distance between identical points is always zero (0). The distance is always a
positive value.
</p>
<p>
The variant with TFloatPoint arguments calculates the distance between the
point Pt and the line represented by the points in SP and EP using Euclidean
geometry. The distance is derived by finding the length of an imaginary line
between Pt and the closest point that intersects the slope of the line in SP
and EP. The distance is always a positive value. The distance for a point which
lies on the defined line is always zero (0).
</p>
</descr>
<seealso/> <seealso/>
</element> </element>
<element name="Distance.Result"> <element name="Distance.Result">
<short/> <short>
Straight-line distance between the specified coordinates or objects.
</short>
</element> </element>
<element name="Distance.PT1"> <element name="Distance.PT1">
<short/> <short>
Starting point for the calculated distance.
</short>
</element> </element>
<element name="Distance.Pt2"> <element name="Distance.PT2">
<short/> <short>
Ending point for the calculated distance.
</short>
</element>
<element name="Distance.Pt">
<short>
Fixed point for the calculated distance.
</short>
</element>
<element name="Distance.SP">
<short>
Starting point for the line used in the distance calculation.
</short>
</element>
<element name="Distance.WP">
<short>
Ending point for the line used in the distance calculation.
</short>
</element> </element>
<element name="EccentricAngle"> <element name="EccentricAngle">