Styles for Selection Sets

You can use GISDK functions to control the style of every selection set in a layer. (To learn how to create and manage selection sets, see Selection Sets.) For example, suppose you have a selection set named "High Income" on the ZIP Code layer. The sample macro below sets the style for the ZIP Code layer, and a different style for ZIP Codes that are in the selection set:

 

// Leave the fill style and color blank

SetBorderColor("ZIP Code|", blue)

SetBorderStyle("ZIP Code|", solid_line)

SetBorderWidth("ZIP Code|", 0.25)

 

// For the high income set, apply a fill style and a fill color...

SetFillStyle("ZIP Code|High Income", checkerboard_fill)

SetFillColor("ZIP Code|High Income", red)

 

The display settings for a selection set can vary from map to map as well. For example, suppose you want the high income ZIP Codes to be shown in checkerboard red in one map, and in striped blue in another map:

 

// Settings for Map1

SetFillStyle("Map1|ZIP Code|High Income", checkerboard_fill)

SetFillColor("Map1|ZIP Code|High Income", red)

 

// Settings for Map2

SetFillStyle("Map2|ZIP Code|High Income", striped_fill)

SetFillColor("Map2|ZIP Code|High Income", blue)

 

Style elements for selection sets can be set to null, indicating that the selection set "inherits" the underlying style element. This lets you make styles cumulative for features that are in more than one selection set.

 

Here is an example. Suppose you have a Roads layer with two selection sets, named High Traffic and Poor Condition, and you set the style, width and color as follows:

 

Setting	Base layer	High traffic	Poor condition
Line style	Solid	Null	Dashed
Line color	Blue	Null	Red
Line width	0.25-point	5-point	Null

 

Here is how each kind of road will be drawn:

 

Road type	Style
Low traffic, good condition	Solid blue 0.25-point line
High traffic, good condition	Solid blue 5-point line
Low traffic, poor condition	Dashed red 0.25-point line
High traffic, poor condition	Dashed red 5-point line