fill
Create filled 2D patches
Description
fill(
plots filled polygonal regions as patches with vertices at the
(x,y) locations specified by X
,Y
,C
)X
and Y
.
To plot one region, specify
X
andY
as vectors.To plot multiple regions, specify
X
andY
as matrices where each column corresponds to a polygon.
C
determines the fill colors for the regions.
fill(___,
modifies the
patches using one or more namevalue arguments to set properties. Patches can be specified
using any of the input argument combinations in previous syntaxes. For example,
Name,Value
)fill(X,Y,C,'LineWidth',2)
specifies a twopoint border around all the
patches. For a list of properties, see Patch Properties.
fill(
plots the polygonal
regions in the axes specified by ax
,___)ax
instead of in the current axes (gca).
The argument ax
can precede any of the input argument combinations in the
previous syntaxes.
returns a
p
= fill(___)Patch
object or a vector of Patch
objects. Use
p
to query and modify properties after plotting a region. For a list of
properties, see Patch Properties.
Examples
Create Filled Pentagon
Define the (x,y) coordinates for the vertices of the pentagon as vectors x
and y
. Then plot the pentagon with the specified fill color, red.
x = [0 4 5 2 1];
y = [0 0 2 4 3];
fill(x,y,'r')
Specify Color by Vertex
Create vectors of x and ycoordinates for a square. Specify a column vector of colormap indices, with one row for each vertex in the square. The fill
function interpolates the remaining fill colors from the default colormap using the surrounding vertices.
x = [0 2 2 0]; y = [0 0 2 2]; c = [1; 0.5; 0; 0.75]; fill(x,y,c)
Specify Multiple Fill Colors
Define matrices x
and y
as the (x,y) coordinates of the vertices for two triangles, where each column corresponds to one of the triangles. Specify c
as a matrix of the same dimensions as x
and y
. Each value in c
specifies the colormap index for the corresponding vertex.
x = [0 2; 0 2; 4 4]; y = [2 0; 4 1; 2 0]; c = [1 0; 1 0; 0.3 0]; fill(x,y,c)
Create Semitransparent Hexagons
Specify (x,y) coordinates for the vertices of a hexagon as vectors x
and y
. Plot these coordinates as a hexagon. Then plot two additional translations of this hexagon on the same axes to create three partially overlapping hexagons. Specify the FaceAlpha
property for each hexagon as a value less than 1
to plot semitransparent hexagons.
x = [1 3 4 3 1 0]; y = [0 0 2 4 4 2]; hold on fill(x,y,'cyan','FaceAlpha',0.3) fill(x+2,y,'magenta','FaceAlpha',0.3) fill(x+1,y+2,'yellow','FaceAlpha',0.3)
Modify Patch After Creation
Plot a filled octagon by specifying vectors of (x,y) coordinates x
and y
, and an RGB triplet c
. Store the resulting patch as p
.
t = (1/16:1/8:1)'*2*pi; x = cos(t); y = sin(t); c = [0.8 0.7 0.8]; p = fill(x,y,c);
Use p
to modify properties of the plotted octagon. Specify a thicker outline by setting the LineWidth
property to 3
, and change the color of the outline to a custom RGB triplet by modifying the EdgeColor
property.
p.LineWidth = 3; p.EdgeColor = [0.5 0.2 0.55];
Input Arguments
X
— xcoordinates of patch vertices
vector  matrix
xcoordinates of the patch vertices, specified as a vector or matrix.
Number of Patches  Description  Example 

One patch  Specify  Plot one triangular patch. X = [0 0 4]; Y = [2 4 2]; C = 1; fill(X,Y,C) 
Two or more patches  Specify the shared coordinates as a vector. Specify the other coordinates as a matrix. The length of the vector must match the length of one dimension of the matrix. If the matrix is square, MATLAB^{®} plots the columns of the matrix against the vector.  Plot two triangular patches with shared x coordinates. X = [0 0 4]; Y = [0 0; 2 2; 0 0]; C = [0 1]; fill(X,Y,C) 
Two or more patches  Specify  Plot two triangular patches with unique x and ycoordinates. X = [0 5; 0 5; 4 9]; Y = [2 0; 4 2; 2 0]; C = [0 1]; fill(X,Y,C) 
If the data does not define closed regions, then fill
closes the
regions.
Data Types: single
 double
 int8
 int16
 int32
 int64
 uint8
 uint16
 uint32
 uint64
 categorical
 datetime
 duration
Y
— ycoordinates of patch vertices
vector  matrix
ycoordinates of the patch vertices, specified as a vector or matrix.
Number of Patches  Description  Example 

One patch  Specify  Plot one triangular patch. X = [0 0 4]; Y = [2 4 2]; C = 1; fill(X,Y,C) 
Two or more patches  Specify the shared coordinates as a vector. Specify the other coordinates as a matrix. The length of the vector must match the length of one dimension of the matrix. If the matrix is square, MATLAB plots the columns of the matrix against the vector.  Plot two triangular patches with shared x coordinates. X = [0 0 4]; Y = [0 0; 2 2; 0 0]; C = [0 1]; fill(X,Y,C) 
Two or more patches  Specify  Plot two triangular patches with unique x and ycoordinates. X = [0 5; 0 5; 4 9]; Y = [2 0; 4 2; 2 0]; C = [0 1]; fill(X,Y,C) 
If the data does not define closed regions, then fill
closes the
regions.
Data Types: single
 double
 int8
 int16
 int32
 int64
 uint8
 uint16
 uint32
 uint64
 categorical
 datetime
 duration
C
— Patch colors
color name  RGB triplet  vector of colormap indices  matrix of colormap indices  ...
Patch colors, specified as a color name, RGB triplet, vector of colormap indices, or a matrix of colormap indices.
Color name — A color name such as
'red'
, or a short name such as'r'
.RGB triplet — A threeelement row vector whose elements specify the intensities of the red, green, and blue components of the color. The intensities must be in the range
[0,1]
; for example,[0.4 0.6 0.7]
. RGB triplets are useful for creating custom colors.Vector of colormap indices — A vector of numeric values that has one element for each region.
Matrix of colormap indices — A matrix of numeric values that has the same dimensions as
X
andY
.
The way you specify the color depends on the color scheme and whether you are plotting one polygonal region or multiple regions. This table describes the most common situations.
Color Scheme  How to Specify the Color  Example 

Single color for all regions 
Specify a color name or a short name from the table below, or specify one RGB triplet.  Create matrices x = [2 0; 2 0; 4 4];
y = [0 2; 1 4; 0 2];
fill(x,y,'r') 
One color per region  Specify an nby1 or 1byn vector of colormap indices, where n is the number of polygonal regions.  Create matrices x = [2 0; 2 0; 4 4]; y = [0 2; 1 4; 0 2]; c = [1; 0]; fill(x,y,c) 
Interpolated face colors  Specify an mbyn matrix of
colormap indices, where  Create matrices x = [2 0; 2 0; 4 4]; y = [0 2; 1 4; 0 2]; c = [0.5 1; 0 1; 1 0]; fill(x,y,c) 
Color Names and RGB Triplets for Common Colors
Color Name  Short Name  RGB Triplet  Hexadecimal Color Code  Appearance 

"red"  "r"  [1 0 0]  "#FF0000"  
"green"  "g"  [0 1 0]  "#00FF00"  
"blue"  "b"  [0 0 1]  "#0000FF"  
"cyan"
 "c"  [0 1 1]  "#00FFFF"  
"magenta"  "m"  [1 0 1]  "#FF00FF"  
"yellow"  "y"  [1 1 0]  "#FFFF00"  
"black"  "k"  [0 0 0]  "#000000"  
"white"  "w"  [1 1 1]  "#FFFFFF" 
Here are the RGB triplets and hexadecimal color codes for the default colors MATLAB uses in many types of plots.
RGB Triplet  Hexadecimal Color Code  Appearance 

[0 0.4470 0.7410]  "#0072BD"  
[0.8500 0.3250 0.0980]  "#D95319"  
[0.9290 0.6940 0.1250]  "#EDB120"  
[0.4940 0.1840 0.5560]  "#7E2F8E"  
[0.4660 0.6740 0.1880]  "#77AC30"  
[0.3010 0.7450 0.9330]  "#4DBEEE"  
[0.6350 0.0780 0.1840]  "#A2142F" 
ax
— Target axes
Axes
object
Target axes, specified as an Axes
object. If you do not specify the
axes, the fill
function plots into the current axes or creates an
Axes
object if one does not exist.
NameValue Arguments
Specify optional pairs of arguments as
Name1=Value1,...,NameN=ValueN
, where Name
is
the argument name and Value
is the corresponding value.
Namevalue arguments must appear after other arguments, but the order of the
pairs does not matter.
Before R2021a, use commas to separate each name and value, and enclose
Name
in quotes.
Example: fill(x,y,c,'FaceAlpha',.5,'LineStyle',':')
creates
semitransparent polygons with dotted edges.
Note
The properties listed here are only a subset of patch properties. For a complete list, see Patch Properties.
FaceColor
— Face color
[0 0 0]
(default)  'interp'
 'flat'
 RGB triplet  hexadecimal color code  'r'
 'g'
 'b'
 ...
Face color, specified as 'interp'
, 'flat'
an RGB
triplet, a hexadecimal color code, a color name, or a short name.
To create a different color for each face, specify the CData
or
FaceVertexCData
property as an array containing one color per
face or one color per vertex. The colors can be interpolated from the colors of the
surrounding vertices of each face, or they can be uniform. For interpolated colors,
specify this property as 'interp'
. For uniform colors, specify this
property as 'flat'
. If you specify 'flat'
and a
different color for each vertex, the color of the first vertex you specify determines
the face color.
To designate a single color for all of the faces, specify this property as an RGB triplet, a hexadecimal color code, a color name, or a short name.
An RGB triplet is a threeelement row vector whose elements specify the intensities of the red, green, and blue components of the color. The intensities must be in the range
[0,1]
; for example,[0.4 0.6 0.7]
.A hexadecimal color code is a character vector or a string scalar that starts with a hash symbol (
#
) followed by three or six hexadecimal digits, which can range from0
toF
. The values are not case sensitive. Thus, the color codes'#FF8800'
,'#ff8800'
,'#F80'
, and'#f80'
are equivalent.
Color Name  Short Name  RGB Triplet  Hexadecimal Color Code  Appearance 

"red"  "r"  [1 0 0]  "#FF0000"  
"green"  "g"  [0 1 0]  "#00FF00"  
"blue"  "b"  [0 0 1]  "#0000FF"  
"cyan"
 "c"  [0 1 1]  "#00FFFF"  
"magenta"  "m"  [1 0 1]  "#FF00FF"  
"yellow"  "y"  [1 1 0]  "#FFFF00"  
"black"  "k"  [0 0 0]  "#000000"  
"white"  "w"  [1 1 1]  "#FFFFFF"  
"none"  Not applicable  Not applicable  Not applicable  No color 
Here are the RGB triplets and hexadecimal color codes for the default colors MATLAB uses in many types of plots.
RGB Triplet  Hexadecimal Color Code  Appearance 

[0 0.4470 0.7410]  "#0072BD"  
[0.8500 0.3250 0.0980]  "#D95319"  
[0.9290 0.6940 0.1250]  "#EDB120"  
[0.4940 0.1840 0.5560]  "#7E2F8E"  
[0.4660 0.6740 0.1880]  "#77AC30"  
[0.3010 0.7450 0.9330]  "#4DBEEE"  
[0.6350 0.0780 0.1840]  "#A2142F" 
FaceAlpha
— Face transparency
1 (default)  scalar in range [0,1]
 'flat'
 'interp'
Face transparency, specified as one of these values:
Scalar in range
[0,1]
— Use uniform transparency across all of the faces. A value of1
is fully opaque and0
is completely transparent. This option does not use the transparency values in theFaceVertexAlphaData
property.'flat'
— Use a different transparency for each face based on the values in theFaceVertexAlphaData
property. First you must specify theFaceVertexAlphaData
property as a vector containing one transparency value per face or vertex. The transparency value at the first vertex determines the transparency for the entire face.'interp'
— Use interpolated transparency for each face based on the values inFaceVertexAlphaData
property. First you must specify theFaceVertexAlphaData
property as a vector containing one transparency value per vertex. The transparency varies across each face by interpolating the values at the vertices.
EdgeColor
— Edge colors
[0 0 0]
(default)  'none'
 'flat'
 'interp'
 RGB triplet  hexadecimal color code  'r'
 'g'
 'b'
 ...
Edge colors, specified as one of the values in this table. The default edge color is black
with a value of [0 0 0]
. If multiple polygons share an edge, then the
first polygon drawn controls the displayed edge color.
Value  Description  Result 

RGB triplet, hexadecimal color code, or color name  Single color for all of the edges. See the following table for more details. 

'flat'  Different color for each edge. Use the vertex colors to set
the color of the edge that follows it. You must first specify


'interp'  Interpolated edge color. You must first specify


'none'  No edges displayed.  No edges displayed. 
RGB triplets and hexadecimal color codes are useful for specifying custom colors.
An RGB triplet is a threeelement row vector whose elements specify the intensities of the red, green, and blue components of the color. The intensities must be in the range
[0,1]
; for example,[0.4 0.6 0.7]
.A hexadecimal color code is a character vector or a string scalar that starts with a hash symbol (
#
) followed by three or six hexadecimal digits, which can range from0
toF
. The values are not case sensitive. Thus, the color codes"#FF8800"
,"#ff8800"
,"#F80"
, and"#f80"
are equivalent.
Alternatively, you can specify some common colors by name. This table lists the named color options, the equivalent RGB triplets, and hexadecimal color codes.
Color Name  Short Name  RGB Triplet  Hexadecimal Color Code  Appearance 

"red"  "r"  [1 0 0]  "#FF0000"  
"green"  "g"  [0 1 0]  "#00FF00"  
"blue"  "b"  [0 0 1]  "#0000FF"  
"cyan"
 "c"  [0 1 1]  "#00FFFF"  
"magenta"  "m"  [1 0 1]  "#FF00FF"  
"yellow"  "y"  [1 1 0]  "#FFFF00"  
"black"  "k"  [0 0 0]  "#000000"  
"white"  "w"  [1 1 1]  "#FFFFFF" 
Here are the RGB triplets and hexadecimal color codes for the default colors MATLAB uses in many types of plots.
RGB Triplet  Hexadecimal Color Code  Appearance 

[0 0.4470 0.7410]  "#0072BD"  
[0.8500 0.3250 0.0980]  "#D95319"  
[0.9290 0.6940 0.1250]  "#EDB120"  
[0.4940 0.1840 0.5560]  "#7E2F8E"  
[0.4660 0.6740 0.1880]  "#77AC30"  
[0.3010 0.7450 0.9330]  "#4DBEEE"  
[0.6350 0.0780 0.1840]  "#A2142F" 
LineStyle
— Line style
""
(default)  ""
 ":"
 "."
 "none"
Line style, specified as one of the options listed in this table.
Line Style  Description  Resulting Line 

""  Solid line 

""  Dashed line 

":"  Dotted line 

"."  Dashdotted line 

"none"  No line  No line 
Output Arguments
p
— Displayed polygonal regions
Patch
object  vector of Patch
objects
Displayed polygonal regions, returned as a Patch
object or vector
of Patch
objects. Each patch corresponds to a plotted region. Use
p
to query or change properties of a region after it is
plotted.
Alternative Functionality
Several functions offer all of the functionality of fill
as well as
additional options for plotting, manipulating, and querying polygons. Use these functions in
place of fill
when appropriate:
To create regular polygons, use
nsidedpoly
. This function simplifies creation of regular polygons and offers additional options for managing the position and dimensions of a plotted polygon.nsidedpoly
creates apolyshape
object, with additional options for altering the location, radius, and side length of thepolyshape
after its creation. Apolyshape
created withnsidedpoly
can be manipulated using all properties ofpolyshape
as well as the properties exclusive tonsidedpoly
.To create irregular polygons, use
polyshape
. This function offers additional options for defining polygons.polyshape
creates apolyshape
object, which has additional properties and object functions for querying and altering a polygon after its creation. For a complete list, seepolyshape
.To create
Patch
objects asfill
does, usepatch
. This function offers additional options for defining both 2D and 3D patches by their face and vertex data.
Extended Capabilities
GPU Arrays
Accelerate code by running on a graphics processing unit (GPU) using Parallel Computing Toolbox™.
The fill
function
supports GPU array input with these usage notes and limitations:
This function accepts GPU arrays, but does not run on a GPU.
For more information, see Run MATLAB Functions on a GPU (Parallel Computing Toolbox).
Distributed Arrays
Partition large arrays across the combined memory of your cluster using Parallel Computing Toolbox™.
Usage notes and limitations:
This function operates on distributed arrays, but executes in the client MATLAB.
For more information, see Run MATLAB Functions with Distributed Arrays (Parallel Computing Toolbox).
Version History
Introduced before R2006aR2021a: The XData
, YData
, and
ZData
properties on Patch
objects created with the
fill
and fill3
functions return values of the
original data type
The XData
, YData
, and
ZData
properties on a Patch
object created by the
fill
or fill3
functions return the coordinates using
the original input data type, rather than returning them as double
values.
In previous releases, datetime
, duration
, and
categorical
coordinates are converted to double
values when they are stored in the XData
, YData
,
and ZData
properties.
For example, this code creates a filled polygonal region with
datetime
xcoordinates. Then it calculates x2
using the values
stored in the XData
property. In R2020b, h.XData
and
x2
are double
arrays. In R2021a,
h.XData
and x2
are datetime
arrays.
x = datetime('01Jan2018') + days([0 1 1 0]); y = [0 0 1 1]; h = fill(x,y,'red'); x2 = h.XData + 1;
To preserve the double
values in your code, get the
double
values from the Vertices
property of the
Patch
object. The x, y, and
zcoordinates are stored as double
values in the
first, second, and third columns of the Vertices
array.
x2 = h.Vertices(:,1) + 1;
Alternatively, use the ruler2num
function. Pass the coordinate values
and the corresponding axis ruler to the ruler2num
function.
ax = gca; x2 = ruler2num(h.XData,ax.XAxis) + 1;
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