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Docs: LCL/lazcanvas. Adds version information and updates topics for changes in aa477d82, d03ae50d. Issue #40100.

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* Adds TLazCanvas.Polygon topic.
* Updates TLazCanvas.DoPolygonFill topic.
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dsiders 2023-01-30 04:01:09 +00:00
parent b923a2265c
commit c27ff841f5
1 changed files with 49 additions and 1 deletions
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docs/xml/lcl/lazcanvas.xml
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@ -249,6 +249,7 @@ Developing with Graphics
<element name="TLazCanvas.FAssignedFont"/> <element name="TLazCanvas.FAssignedFont"/>
<element name="TLazCanvas.FAssignedPen"/> <element name="TLazCanvas.FAssignedPen"/>
<element name="TLazCanvas.FBaseWindowOrg"/> <element name="TLazCanvas.FBaseWindowOrg"/>
<element name="TLazCanvas.FPolygonWindingMode"/>
<element name="TLazCanvas.FLazClipRegion"/> <element name="TLazCanvas.FLazClipRegion"/>
<element name="TLazCanvas.FWindowOrg"/> <element name="TLazCanvas.FWindowOrg"/>
@ -405,7 +406,16 @@ Implements a polygon fill algorithm not present in fcl-image. The algorithm
is explained <url href="http://alienryderflex.com/polygon_fill/">here</url>. is explained <url href="http://alienryderflex.com/polygon_fill/">here</url>.
</p> </p>
</descr> </descr>
<seealso/> <version>
Modified in LCL versions after 2.2.4 to call DrawPixel instead of SetColor
when drawing pixels between points on the polygon. This allows the DrawingMode
(opacity, alphablending, custom) to be applied to the pixels. Adds support for
the non-zero winding rule in the fill operation.
</version>
<seealso>
<link id="TLazCanvas.AlphaBlend"/>
<link id="TLazCanvas.SetColor"/>
</seealso>
</element> </element>
<element name="TLazCanvas.DoPolygonFill.points"> <element name="TLazCanvas.DoPolygonFill.points">
<short>Array with the TPoint instances for the polygon corners.</short> <short>Array with the TPoint instances for the polygon corners.</short>
@ -952,6 +962,44 @@ range of pixels in the Image.
</short> </short>
</element> </element>
<element name="TLazCanvas.Polygon">
<short>
Overloaded method which adds support for the non-zero winding rule.
</short>
<descr>
<p>
Polygon is an overloaded method in TLazCanvas. It provides support for the
non-zero winding rule in the polygon fill operation.
</p>
<p>
The overloaded variant extends the method from TFPCustomCanvas to include the
Winding argument used in the DoPolygonFill method. When Winding is set to
<b>True</b>, DoPolygonFill calculates the winding number for the sorted
vertices on the polygon and calls DrawPixel to apply the brush color needed
for the pixels inside the winding path.
</p>
<p>
Polygon updates the internal member used to store the value in Winding, and
calls the inherited method in TFPCustomCanvas where the brush and pen colors
are used to draw the polygon represented in Points.
</p>
</descr>
<version>
Added in LCL version 2.4.
</version>
<seealso/>
</element>
<element name="TLazCanvas.Polygon.Points">
<short>
Array with the TPoint instances for the vertices on the polygon.
</short>
</element>
<element name="TLazCanvas.Polygon.Winding">
<short>
<b>True</b> if the non-zero winding rule is enabled for the canvas instance.
</short>
</element>
<element name="TLazCanvas.AssignPenData"> <element name="TLazCanvas.AssignPenData">
<short>Sets the Pen data for the canvas.</short> <short>Sets the Pen data for the canvas.</short>
<descr> <descr>