Home | Docs | Issue Tracker | FAQ | Download | |
Author: | Pericles Nacionales |
---|---|
Contact: | naci0002 at umn.edu |
Revision: | $Revision$ |
Date: | $Date$ |
Last Updated: | 2009/01/17 |
Note
For quality antialiased output from mapserver, it is highly recommended to use the AGG rendering. This document applies only if you whish to stick to the GD rendering, or if you are using a version predating the 5.0 release of mapserver.
Table of Contents
1. Change (or add) IMAGETYPE keyword in MAP object to PNG24 (24-bit PNG output) or JPEG
MAP
...
IMAGETYPE PNG24
...
END
MAP
...
IMAGETYPE PNG24
...
LAYER
...
TRANSPARENCY ALPHA
...
END
END
MAP
...
IMAGETYPE PNG24
...
LAYER
...
TRANSPARENCY ALPHA
...
CLASS
...
STYLE
...
ANTIALIAS TRUE
...
END
\.\.\.
END # end class
END # end layer
END # end map
Note
Don’t use the SYMBOL or the SIZE keywords within the CLASS object, instead use WIDTH to specify width of line or polygon outline. Don’t use WIDTH unless you have to. If you must define a SYMBOL, use symbol of type ELLIPSE–it supports antialiasing.
Here’s an example of a real-world mapfile:
Note
From MapServer 6, symbol type CARTOLINE is no longer supported. You have to use AGG rendering and STYLE PATTERN to achieve dashed lines. Therefore, the following example does not work anymore.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 | MAP
NAME 'ms101'
EXTENT -2198022.00 -2444920.25 2707932.00 1234545.25 # CONUS LAEA (US)
SIZE 640 480
SHAPEPATH 'data'
SYMBOLSET 'symbols/symbols.txt'
IMAGETYPE PNG24
PROJECTION
"init=epsg:2163"
END
# The layer below will be rendered as 1-pixel wide, antialiased line
# If you'd like to change the line thickness add the WIDTH keyword
# in the STYLE object with a value of 3 or greater.
LAYER # begin antialiased country boundary (line) layer
NAME 'country_line'
DATA 'shapefile/WorldCountryBorders'
TYPE LINE
STATUS ON
TRANSPARENCY ALPHA
PROJECTION
"init=epsg:4326"
END
CLASS
NAME 'Country Boundary'
STYLE
COLOR 96 96 96
ANTIALIAS TRUE
END
END
END # end country boundary layer
# The layer below shows one way to draw a polygon with antialiased outline
LAYER # begin antialiased country boundary (polygon) layer
NAME 'country_line'
DATA 'shapefile/Countries_area'
TYPE POLYGON
STATUS ON
TRANSPARENCY ALPHA
PROJECTION
"init=epsg:4326"
END
CLASS
NAME 'Country Boundary'
STYLE
COLOR 212 212 212
OUTLINECOLOR 96 96 96
WIDTH 3
ANTIALIAS TRUE
END
END
END # end country boundary polygon layer
# The layer below shows one way to draw a polygon with antialiased outline
LAYER # begin antialiased state boundary (line) layer
NAME 'state_line'
DATA 'shapefile/us_states'
TYPE LINE
STATUS ON
TRANSPARENCY ALPHA
PROJECTION
"init=epsg:4326"
END
CLASS
NAME 'State Boundary'
STYLE
COLOR 144 144 144
SYMBOL 'cartoline'
ANTIALIAS TRUE
END
END
END # end state line layer
END # end of map file
|
Here’s how the ‘cartoline’ symbol is defined:
Note
From MapServer 6, symbol type CARTOLINE is not available. You have to use AGG rendering and STYLE PATTERN to achieve dashed lines. Therefore, the following symbol can not be used anymore.
SYMBOL
NAME 'cartoline'
TYPE CARTOLINE
LINECAP "round"
LINEJOIN "round"
LINEJOINMAXSIZE 3
END
Note
The examples provided here are for illustrative purposes only–keep your map file definitions simple. Antialiasing adds computing overhead on the server and could slow/degrade its performance. Don’t use it unless you must and certainly don’t use symbols with it unless you really have to.