2D polygons
This functionality does not run in MATLAB.
plot::Polygon2d([pt2d_{1}, pt2d_{2}, …]
, <a = a_{min} .. a_{max}
>,options
) plot::Polygon2d(M_{2d}
, <a = a_{min} .. a_{max}
>,options
)
plot::Polygon2d
define polygons in 2D, by
a given list of vertex points.
A polygon consists of points and edges. The edges are made up
of the lines traversing from the first to the second point, the second
to the third point, and so on. The last point is automatically connected
with the first point if the attribute Closed
= TRUE
is
specified.
Points and lines can be hidden via PointsVisible
= FALSE
and LinesVisible
= FALSE
.
Per default the vertex points are hidden while the edges are visible.
All points as a whole can be manipulated via PointStyle
and PointSize
.
The attribute LineColor
sets the color for all points
and all lines. Likewise all lines can be manipulated via LineStyle
and LineWidth
.
It is possible to vary the color of all lines and points via LineColorType
.
The default value is Flat
. Specifying the values Dichromatic
or Rainbow
,
a second color LineColor2
can be set. With Functional
,
the colors are taken from a user defined LineColorFunction
. Cf. Example 2.
The area of any closed 2D polygon can be filled by specifying Filled
= TRUE
.
The filled area is defined by connecting the last and the first vertex.
This additional edge itself, however, is only displayed if Closed
= TRUE
is
set.
A fill color and a fill pattern can be chosen by FillColor
and FillPattern
.
In case of a selfintersecting polygon, a FillStyle
can be selected.
Cf. Example 3.
Attribute  Purpose  Default Value 

AffectViewingBox  influence of objects on the ViewingBox of
a scene  TRUE 
AntiAliased  antialiased lines and points?  TRUE 
Closed  open or closed polygons  FALSE 
Color  the main color  RGB::Blue 
Filled  filled or transparent areas and surfaces  FALSE 
FillColor  color of areas and surfaces  RGB::Red 
FillStyle  definition of inside/outside  EvenOdd 
FillPattern  type of area filling  DiagonalLines 
Frames  the number of frames in an animation  50 
Legend  makes a legend entry  
LegendText  short explanatory text for legend  
LegendEntry  add this object to the legend?  FALSE 
LineColor  color of lines  RGB::Blue 
LineWidth  width of lines  0.35 
LineColor2  color of lines  RGB::DeepPink 
LineStyle  solid, dashed or dotted lines?  Solid 
LinesVisible  visibility of lines  TRUE 
LineColorType  line coloring types  Flat 
LineColorFunction  functional line coloring  
LineColorDirection  the direction of color transitions on lines  [0 , 1 ] 
LineColorDirectionX  xcomponent of the direction of color transitions on lines  0 
LineColorDirectionY  ycomponent of the direction of color transitions on lines  1 
Name  the name of a plot object (for browser and legend)  
ParameterEnd  end value of the animation parameter  
ParameterName  name of the animation parameter  
ParameterBegin  initial value of the animation parameter  
ParameterRange  range of the animation parameter  
Points2d  list of 2D points  
PointSize  the size of points  1.5 
PointStyle  the presentation style of points  FilledCircles 
PointsVisible  visibility of mesh points  FALSE 
TimeEnd  end time of the animation  10.0 
TimeBegin  start time of the animation  0.0 
TimeRange  the real time span of an animation  0.0 .. 10.0 
Title  object title  
TitleFont  font of object titles  [" sansserif " , 11 ] 
TitlePosition  position of object titles  
TitleAlignment  horizontal alignment of titles w.r.t. their coordinates  Center 
TitlePositionX  position of object titles, x component  
TitlePositionY  position of object titles, y component  
Visible  visibility  TRUE 
VisibleAfter  object visible after this time value  
VisibleBefore  object visible until this time value  
VisibleFromTo  object visible during this time range  
VisibleAfterEnd  object visible after its animation time ended?  TRUE 
VisibleBeforeBegin  object visible before its animation time starts?  TRUE 
We create a polygon with vertices located at the 5 complex 5^{th} roots of 1. The polygon consists of the 4 lines joining the 5 points in the order given:
p := plot::Polygon2d( [[cos(2*PI*k/5), sin(2*PI*k/5)] $ k = 0..4]): plot(p, plot::Circle2d(1, [0, 0])):
In order to include the line connecting the last with the first
point, pass the attribute Closed
to the polygon:
p::Closed := TRUE: plot(p, plot::Circle2d(1, [0, 0])):
delete p
We plot a closed starshaped 3D polygon with various color attributes:
p := plot::Polygon3d( [([cos(PI*k/3), sin(PI*k/3), sin(PI*k/3)], [cos(PI*k/3 + PI/6)/2, sin(PI*k/3 + PI/6)/2, sin(PI*k/3 + PI/6)/2]) $k = 1..6 ], Closed = TRUE): S1 := plot::Scene3d(p, LineColorType = Flat): S2 := plot::Scene3d(p, LineColorType = Dichromatic): S3 := plot::Scene3d(p, LineColorType = Dichromatic, LineColor = RGB::Blue, LineColor2 = RGB::Green): S4 := plot::Scene3d(p, LineColorType = Rainbow, LineColor = RGB::Blue, LineColor2 = RGB::Green): plot(S1, S2, S3, S4)
We plot the same polygon while animating its line color using a color function. The result is a dazzling star:
p := plot::Polygon3d( [([cos(PI*k/3), sin(PI*k/3), sin(PI*k/3)], [cos(PI*k/3 + PI/6)/2, sin(PI*k/3 + PI/6)/2, sin(PI*k/3 + PI/6)/2]) $k = 1..6 ], Closed = TRUE, LineColorFunction = proc(x, y, z, i, a) begin [sin(x + a*i)^2, sin(y + a*i)^2, sin(z + a*i)^2]: end_proc, a = 0..10): plot(p)
delete p, S1, S2, S3, S4
We plot a closed 2D polygon and fill the area inside. In fact,
there are two possible interpretations of what "inside"
really means. In the first plot, the complement of the unbound component
of the complement of the polygon is filled. In the second plot only
that area is filled that contains points with nonzero winding number
with respect to the polygon. Cf. FillStyle
for a detailed
discussion.
p := plot::Polygon2d( [[cos(PI*k/3), sin(PI*k/3)] $k = 1..6, [cos(PI*k/3 + PI/6)/2, sin(PI*k/3 + PI/6)/2] $k = 1..6 ], Closed = TRUE): S1 := plot::Scene2d(p, Filled = TRUE): S2 := plot::Scene2d(p, Filled = TRUE, FillStyle = Winding): plot(S1, S2, Layout = Horizontal, Axes = Frame, Scaling = Constrained)
delete p, S1, S2:

The 2D vertices. These must not be of type


An array or a matrix with 2 columns. Each row provides the coordinates of one point.


Animation parameter, specified as 