ArrowData
Create an arrow data plot.
Syntax
model.result(<pgtag>).create(<ftag>,"ArrowData");
model.result(<pgtag>).feature(<ftag>).set(property, <value>);
model.result(<pgtag>).feature(<ftag>).run();
Description
model.result(<pgtag>).create(<ftag>,"ArrowData") creates an arrow data plot feature named <ftag> belonging to the 2D or 3D plot group <pgtag>.
Arrow data plots are used to visualize raw vector data given as points, vectors, and colors (see the example below). Arrow data plots can be added to 2D and 3D plot groups.
The following properties are available:
Table 7-9: Valid Property/Value Pairs for Arrow Data Plots
name
Value
Default
Description
arrowbase
head | tail|
center
tail
Whether the head, tail, or center of the arrow is located at the arrow position.
arrowlength
normalized | proportional | logarithmic
proportional
The arrow scaling: Proportional uses the actual arrow length, normalized a unit length, and logarithmic a length proportional to the logarithm of the arrow length.
arrowtype
arrow | arrowhead | cone
arrow
The type of arrow to draw.
bottomcolor
custom | black | blue | cyan | gray | green | magenta | red | white | yellow
black
The bottom color to use for a color gradient. Active when coloring is gradient.
color
custom | black | blue | cyan | gray | green |magenta | red | white | yellow
red
The uniform color to use. Active when coloring is uniform.
colordata
double 1D array
 
The color data for the arrow data plot as a real N-vector.
coloring
colortable | uniform | gradient
colortable
How to color the plot: using a color table, a uniform color, or a color gradient.
colorlegend
on | off
on
Whether to show color legend when coloring is set to colortable.
colortable
color table name
Rainbow
The color table to use when coloring is set to colortable. See Color Tables for a list of color tables.
colortablerev
on | off
off
Whether to reverse to color table or gradient when coloring is set to colortable or gradient.
colortablesym
on | off
off
Whether to symmetrize the color range around 0 when coloring is set to colortable or gradient.
custombottomcolor
RGB-triplet
{1,0,0} or last used color.
The uniform color to use. Active when bottomcolor is set to custom.
customcolor
RGB-triplet
{1,0,0} or last used color.
The uniform color to use. Active when color is set to custom.
customtopcolor
RGB-triplet
{1,0,0} or last used color.
The uniform color to use. Active when topcolor is set to custom.
logrange
double > 1
100
If arrowlength is logarithmic: The ratio between the maximum arrow length and the arrow length below which no arrow is drawn.
pointdata
double 2D array
 
The point data for the arrows’ starting points in the arrow data plot, as x and y coordinates in 2D and x, y, and z coordinates in 3D in an sdim-by-N real matrix.
rangecoloractive
on | off
off
Whether to use the manual color range specified in rangecolormin and rangecolormax. The color range specifies the minimum and maxim value in the plotted colors. Default is the minimum and maximum data values.
rangecolormax
double
Plot-dependent
The maximum color range value. Active when rangecoloractive is on.
rangecolormin
double
Plot-dependent
The minimum color range value. Active when rangecoloractive is on.
rangedatactive
on | off
off
Whether to use the manual data range specified in rangedatamin and rangedatamax. Values outside the data range are not plotted.
rangedatamax
double
Plot-dependent
The maximum data value. Active when rangedataactive is on.
rangedatamin
double
Plot-dependent
The minimum data value. Active when rangedataactive is on.
title
String
The auto-title.
The title to use when titletype is manual.
titletype
auto | manual | none
none
auto if the title contribution should be computed automatically. manual if the manual title contribution should be used (the title property). none if no title contribution should be used.
topcolor
custom | black | blue | cyan | gray | green | magenta | red | white | yellow
white
The top color to use for a color gradient. Active when coloring is gradient.
vectordata
double 2D array
 
The vector data for the arrow data plot, as sign and length of the arrows in the x and y directions in 2D and in the x, y, and z directions in 3D in an sdim-by-N real matrix.
Attributes
None.
Example
A method for creating an arrow circle in 2D.
Code for Use with Java
String pgTag = model.result().uniquetag("pg");
ResultFeature pg = model.result().create(pgTag, 2);
ResultFeature plot = pg.create("arrow1", "ArrowData");
int N = 17;
double[][] p = new double[2][N];
double[][] vec = new double[2][N];
double len = 0.2;
for (int i = 0; i < N; i++) {
double angle = 2*Math.PI*i/N;
p[0][i] = Math.cos(angle);
p[1][i] = Math.sin(angle);
vec[0][i] = -len*p[0][i];
vec[1][i] = -len*p[1][i];
}
plot.set("pointdata", p).set("vectordata", vec);
A method for creating a 3D logarithmic arrow spiral.
Code for Use with Java
String pgTag = model.result().uniquetag("pg");
ResultFeature pg = model.result().create(pgTag, 3);
ResultFeature plot = pg.create("arrow1", "ArrowData");
int N = 1000;
double[][] p = new double[3][N];
double[][] vec = new double[3][N];
double[] color = new double[N];
for (int i = 0; i < N; i++) {
double par = 0.005*i;
p[0][i] = Math.exp(par)*Math.cos(10*par);
p[1][i] = Math.exp(par)*Math.sin(10*par);
p[2][i] = 0.1*i;
double len = Math.sqrt(p[0][i]*p[0][i]+p[1][i]*p[1][i]+p[2][i]*p[2][i]);
for (int j = 0; j < 3; j++) {
vec[j][i] = 4*p[j][i]/len;
}
color[i] = i;
}
plot.set("pointdata", p)
.set("vectordata", vec)
.set("colordata", color)
.set("coloring", "colortable");
See Also
AnnotationData, LineData, PointData, SurfaceData, TubeData