[mapserver-users] About Arrowhead problem

[ila pathak]

*About Arrowhead problem:*

* *

*I am working on a GIS project & need to show directions(one way direction)
along a section of a road or highway. I need to show regularly spaced arrows
along the line segment.*

* *

*Problem: Creation of arrowhead*

*I am creating arrowhead symbol to be derived from a TrueType font. So my
symbol file looks like:*

* *

*SYMBOL*

*NAME "one_way_from"*

*TYPE truetype*

*FONT arial-bold*

*CHARACTER ">"*

*#FONT "Wingdings"*

*#CHARACTER "è"*

*GAP -40*

*END *

* *

* *

*SYMBOL*

*NAME "one_way_to"*

*TYPE truetype*

*FONT arial-bold*

*CHARACTER "<"*

*#FONT "Wingdings"*

*#CHARACTER "&#???;"*

*GAP -40*

*END *

* *

*And I have created a separate Layer just to display the arrowhead on the
road, which looks like this: *



*LAYER*

*  GROUP "Basemap"*

*  NAME "major road direction"*

*  CONNECTIONTYPE databasetype*

*  CONNECTION connection_string*

*  DATA "query_to_be_executed"*

*  *

*  CLASSITEM "ONEWAYDIRECTION"*

*  TYPE Line*

*  STATUS ON*

* *

*  CLASS*

*       NAME "From"*

*       EXPRESSION *([ONEWAYDIRECTION] = 1)     **

*       STYLE*

*         SYMBOL "one_way_from"*

*         COLOR 0 0 0*

*         SIZE 6*

*       END *

*  END*

* *

*   CLASS*

*       NAME "To"*

*       EXPRESSION *([ONEWAYDIRECTION] = 0)   **

*       STYLE*

*         SYMBOL "one_way_to"*

*         COLOR 0 0 0*

*         SIZE 6*

*       END*

*     END *

*      *

* END # Layer*



*Where ONEWAYDIRECTION is a column in my road named table, having 0 or 1
value.*

* And the Road layer looks like this:*

*LAYER*

*  NAME "major road"*

*  CONNECTIONTYPE database_type*

*  CONNECTION "username/password"*

*  DATA "query_to_be_executed"*

*  CLASSITEM "ROADCLASS"*

*  LABELITEM "STREETNAME"*

*  TYPE Line*

*  STATUS ON*

*  CLASS*

*    NAME "MAJOR-ROADS"*

*    MAXSCALE 30000*

*    MINSCALE 7000*

*    EXPRESSION ([ROADCLASS] <= 5 )*

*   *

* *

*      style *

*         *

*           color 255 192 203*

*           #color 246 191 0*

*           width 9 *

*           antialias true*

*     end*

* *

*    style*

*              *

*       color 255 192 203*

*       #color 255 222 0*

*       width 8*

*       antialias true*

*   end*

* *

*END # Layer*

* *

*Now on executing this, I am only getting road on my screen. I am not
getting the arrows along with road. Please see where I am doing mistake &
let me know about it.*
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