7  Designing the links/arrows

This chapter concerns the drawing of the links features : their geometry/shape and their semiology.

Sign parameters are set on the left panel - in the layer management section ie. the lower part, which displays at least two geographical layers : one on links and one on nodes.

Note:

Other geographic information layers (tiles, …) can also be displayed in this section.

7.2 Links’s semiology

Three semiological parameters are available for designing the links : their color, their size and their opacity.

7.3 Links’s color

The colour of the links can be set according to three criteria: a colorimetric space, a variable ; the type of the variable.

7.3.1 Setting the colorimetric space

The colour/tone of the links can be defined in the following three spaces, by clicking on the double arrow icon :

- Red Green Blue (RGB)

- Hue, saturation, luminosity (HSL)

- HEXagesimal (HEX)

7.3.2 Setting modes of the color

  • Fixed mode of color means that the ton is identical for all nodes.

  • Conditional mode means that the color of the nodes will vary according to several parameters.

The color/tone can vary according to a specific variable and its type.

The reference for the color schemes is Cynthia Brewer palette for Diverging, Multi Hue and Single Hue. See: Color Brewer advices for maps. An Extra Palettes is also proposed in Arabesque.

7.3.3 Color variation as a function of a variable

The color of the links can be set according to one of the variables (initial or calculated by Arabesque) that are available in the dataset.

7.3.4 Color variation as a function of the type of a variable

Caution

The type of color range (Diverging/Multi Hue/Single Hue/Extra Palette) will have to be realized according to the type of the variable to represent (quantitative/qualitative, discrete/continuous, stock/ratio/scale, …).

The progression (up/down) of the color range depends on that of the value range: it can be direct or inverse. The checked box means an inverse progression: a light color is applied to a strong value.