Segments properties

Description

The Segs entity is a leaf of the graphics entities hierarchy. This entity defines the parameters for a set of colored segments or colored arrows.

parent:

This property contains the handle of the parent. The parent of the segment entity should be of the type "Axes" or "Compound".

children:

This property contains a vector with the children of the handle. However, segs handles currently do not have any children.

visible:

This field contains the visible property value for the entity. It should be "on" or "off". By default, the segments are visible, the value's property is "on". If "off" the segments are not drawn on the screen.

data:

This field is two column matrix [x,y, [z]] which gives the coordinates of the segments boundary. If xv = matrix(x,2,-1) and yv = matrix(y,2,-1) then xv(:,k) and yv(:,k) are the boundary coordinates of the segment numbered k.

line_mode:

This field contains the default line_mode property value for the segs. Its value should be "on" (line drawn) or "off" (no line drawn).

line_style:

The line_style property value should be an integer in [1 8]. 1 stands for solid, the other value stands for a selection of dashes (dash, dash dot, longdash dot, bigdash dot, bigdash longdash, dot, double dot).

thickness:

This property is a positive real specifying the arrow width in pixels. The displayed width is actually determined by rounding the supplied width to the nearest integer. The only exception is vectorial export where the whole thickness value is considered.

arrow_size:

The factor that specify the size of arrowheads. With a negative value, the size is also dependent on the arrows length. To draw segment, the value must be set to 0.

segs_color:

This field contains the vector of colors to use to draw each segment. Each element is a color index relative to the current colormap.

mark_mode:

This field contains the default mark_mode property value for the polyline. Its value should be "on" (marks drawn) or "off" (no marks drawn).

mark_style:

The mark_style property value is used to select the type of mark to use when mark_mode property is "on". The value should be an integer in [0 14] which stands for: dot, plus, cross, star, filled diamond, diamond, triangle up, triangle down, diamond plus, circle, asterisk, square, triangle right, triangle left and pentagram. The figure below shows the aspects of the marks depending on the mark_style and the mark_foreground and mark_background properties.

mark_size_unit:

This field contains the default mark_size_unit property value. If mark_size_unit is set to "point", then the mark_size value is directly given in points. When mark_size_unit is set to "tabulated", mark_size is computed relative to the font size array: therefore, its value should be an integer in [0 5] which stands for 8pt, 10pt, 12pt, 14pt, 18pt and 24pt. Note that plot2d and pure scilab functions use tabulated mode as default; when using plot function, the point mode is automatically enabled.

mark_size:

The mark_size property is used to select the type of size of the marks when mark_mode property is "on". Its value should be an integer between 0 and 5 which stands for 8pt, 10pt, 12pt, 14pt, 18pt and 24pt.

mark_foreground:

This field contains the mark_foreground property value which is the marks' edge color. Its value should be a color index (relative to the current color_map) or 0 for transparent edge.

mark_background:

This field contains the mark_background property value which is the marks' face color. Its value should be a color index (relative to the current color_map) or 0 for transparent face.

clip_state:

This field contains the clip_state property value for the segments. It should be :

• "off" this means that the segments are not clipped.

• "clipgrf" this means that the segments are clipped outside the Axes box.

• "on" this means that the segments are clipped outside the rectangle given by the property clip_box.

clip_box:

This field contains the clip_box property. By default segments are not clipped, clip_state is "off", so the value should be an empty matrix. Other cases the vector [x, y, w, h] (upper-left point, width, height) defines the portions of the segments to display, however clip_state property value will be changed.

user_data:

This field can be use to store any scilab variable in the segs data structure, and to retrieve it.

Examples

a=get("current_axes");//get the handle of the newly created axes
a.data_bounds=[-10,-10;10,10];
x=2*%pi*(0:7)/8;
xv=[2*sin(x);9*sin(x)];
yv=[2*cos(x);9*cos(x)];
xsegs(xv,yv,1:8)

s=a.children
s.arrow_size=1;
s.segs_color=15:22;
for j=1:2
  for i=1:8
    h=s.data(i*2,j);
    s.data(i*2,j)=s.data(i*2-1,j);
    s.data(i*2-1,j)=  h;
  end
end

s.segs_color=5; //set all the colors to 5

s.clip_box=[-4,4,8,8];
a.thickness=4;
xrect(s.clip_box);

See also

• set — set a property value of a graphic entity object or of a User Interface object.
• get — Retrieve a property value from a graphics entity or an User Interface object.
• delete — delete a graphic entity and its children.
• xsegs — draw unconnected segments
• graphics entities — description of the graphics entities data structures

History