[mapserver-users] GRID labeling, OK,
where are the MapServer GRID guru's??
Brent Fraser
bfraser at geoanalytic.com
Tue Mar 18 21:46:07 EDT 2008
Bob,
Good on you for pursuing this! While I think the current grid object
satisfies most of mapserver implementors' needs, there is room for
improvement. The ultimate would be a system that can produce reference
system labels like those found on topos (some are very similar to your
NG labels).
First, I see there is still a typo in mapgraticule.c, line 347 (current
SVN) should be
dStartY = (pInfo->pboundinglines[0].point[1].y -
pInfo->pboundinglines[0].point[0].y) * dDeltaX +
pInfo->pboundinglines[0].point[0].y;
(note the last array index value of 0 not 1)
Second, (from my old notes on experimenting with labeling in v4.3) I
changed 661 thru 682 to:
switch( ePosition )
{
case posBottom:
pShape->line->point[1].y = pLayer->map->height;
pShape->line->point[0].y = pLayer->map->height - (
fabs(rectLabel.maxx - rectLabel.minx) + 15 ); /* rectLabel is based
on non-rotated text (x is along the width of text) */
break;
case posTop:
pShape->line->point[1].y = 0;
pShape->line->point[0].y = fabs(rectLabel.maxx - rectLabel.minx) + 15;
break;
case posLeft:
pShape->line->point[1].x = 0;
pShape->line->point[0].x = fabs(rectLabel.maxx - rectLabel.minx) + 15;
break;
case posRight:
pShape->line->point[1].x = pLayer->map->width;
pShape->line->point[0].x = pLayer->map->width - (
fabs(rectLabel.maxx - rectLabel.minx) + 15 );
break;
}
And regarding labeling "outside" the map, I arranged my map file to draw:
1. all the usual raster and vector layers
2. a grid layer
3. a "margin" layer of blanking polygons (see below)
4. a grid layer of type annotation so no lines are drawn
Here's part of my map file (for version 4.3 so no telling what will happen
with v5.x):
SIZE 800 600
:
:
LAYER
NAME "Margin"
TRANSFORM FALSE
STATUS DEFAULT
TYPE POLYGON
CLASS
COLOR 255 255 255
END
FEATURE
POINTS 0 0 0 600 70 600 70 0 0 0 END
POINTS 70 0 70 70 800 70 800 0 70 0 END
POINTS 70 600 800 600 800 530 70 530 70 600 END
POINTS 730 70 730 530 800 530 800 70 730 70 END
END
END
#-----------------------------------------------------------
LAYER
NAME "NeatLine"
TRANSFORM FALSE
STATUS DEFAULT
TYPE LINE
CLASS
COLOR 0 0 0
END
FEATURE
POINTS 70 70 70 530 730 530 730 70 70 70 END
END
END
#-----------------------------------------------------------
LAYER
NAME "GRID"
PROJECTION
"proj=latlong"
# "ellps=sphere"
"datum=WGS84"
END
# TYPE Line
TYPE ANNOTATION
# LABELCACHE off
STATUS DEFAULT
CLASS
COLOR 128 128 128
# LABEL
# TYPE BITMAP
# SIZE MEDIUM
# COLOR 128 128 89
# END
LABEL
color 0 0 0
# COLOR 255 255 0
# OUTLINECOLOR 0 0 0
TYPE TRUETYPE
FONT arial #bd
SIZE 12
POSITION UC # AUTO
ANGLE AUTO
# OFFSET 4 4
# PARTIALS false
# WRAP " "
END # Label
END
GRID
LABELFORMAT "DDMM"
# LABELFORMAT "DDMMSS"
# MINSUBDIVIDE 6
# MAXSUBDIVIDE 6
# MININTERVAL 1.0
# MAXINTERVAL 1.0
# MINARCS 6
# MAXARCS 6
END
END
#-----------------------------------------------------------
END # MAPFILE
But in the end it is somewhat hacky and not perfect. I think some
additional objects and properties are needed. Last year I had a small
rant regarding graticules on the OSGeo mailing list (with no specific
solution reached). Here's one record of it:
http://www.mail-archive.com/discuss@lists.osgeo.org/msg00935.html
Keep up the good work!
Brent Fraser
> All,
>
> I've (we've) been messing with this GRID object and Labeling while trying
> to get a USNG grid output with labels
>
> The results are meant to look like the left edge of the attached image.
> The other three sides are being repositioned by some semi-known process.
>
> Essentially the labels should be:
>
> First two characters are super-scripted, the next two characters are
> Normal, and the last four are also super-scripted. We've mussed with
> MapServer code and come up with a method for handling the different
> styling via a layer in the MAPFILE, using a LABELFORMAT option of NG1(1st
> 2 chars), NG2 (2nd 2 chars) and NG3 (the last 4 chars). This is set up
> along the lines of the DDMMSS options for LAT/LON.
>
> You can see that there is something wonky about the justification of the
> labels. Right now we have space padding in front of and behind the
> superscripted items, we'll address that separately once we get past this
> label justification thing.
>
> So the question is, what is the sequence of events for a GRID with labels,
> being applied to the result? Where in the Code could/should the
> justifications be eliminated for the GRID writing process (I understand
> that there needs to be a process for aligning along the edges) so that the
> regular Labeling parameters, specifically, the OFFSET param, are adhered
> to.
>
> I've tried all sorts of different combinations of settings to get the
> right output, and I can only seem to get one edge to display properly.
>
> Furthering this output option a little more, anyone done any work with
> labeling along the outside of a map image? I could use an option like
> this for printing for example.
>
> Thanks
>
> bobb
>
>
> The image results are from using this MapFile:
>
> MAP
> NAME 'USNG'
> SIZE 800 650
> STATUS ON
> ##IMAGECOLOR 254 254 254
> ##EXTENT 540000 135000 600000 175000
> EXTENT 593133.398829 170094.734526 593893.148973 170712.010326
> UNITS FEET
>
> FONTSET ./0000_00/MN_Line_Experiments/fonts/font.list
> SYMBOLSET ./0000_00/MN_Line_Experiments/symbols/symbol.list
>
> TRANSPARENT TRUE
> IMAGETYPE PNG
>
> WEB
> IMAGEPATH "/mnt/VECTOR00/output/"
> IMAGEURL "/tmp/"
> END
>
> # EPSG:26915
>
> LAYER
> NAME "grid"
> TYPE LINE
> STATUS DEFAULT
> CLASS
> NAME "Graticule"
> COLOR 0 0 0
> SYMBOL 'circle'
> SIZE 1
> END
> PROJECTION
> "init=epsg:26915"
> END
> GRID
> LABELFORMAT "NG1"
> END
> END
>
> LAYER
> NAME "ng1"
> TYPE LINE
> STATUS DEFAULT
> CLASS
> LABEL
> COLOR 0 0 0
> FONT mono
> TYPE truetype
> SIZE 6
> OUTLINECOLOR 255 255 254
> FORCE true
> POSITION cl
> #OFFSET 0 0
> END
> END
> PROJECTION
> "init=epsg:26915"
> END
> GRID
> LABELFORMAT "NG1"
> END
> END
>
> LAYER
> NAME "ng2"
> TYPE LINE
> STATUS DEFAULT
> CLASS
> LABEL
> COLOR 0 0 0
> FONT mono
> TYPE truetype
> SIZE 12
> OUTLINECOLOR 255 255 254
> FORCE true
> POSITION cl
> END
> END
> PROJECTION
> "init=epsg:26915"
> END
> GRID
> LABELFORMAT "NG2"
> END
> END
>
> LAYER
> NAME "ng3"
> TYPE LINE
> STATUS DEFAULT
> CLASS
> LABEL
> COLOR 0 0 0
> FONT mono
> TYPE truetype
> SIZE 6
> OUTLINECOLOR 255 255 254
> FORCE true
> #OFFSET 0 0
> POSITION cl
> END
> END
> PROJECTION
> "init=epsg:26915"
> END
> GRID
> LABELFORMAT "NG3"
> END
> END
>
>
> END ## end Map
>
> _______________________________________________
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> mapserver-users at lists.osgeo.org
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>
>
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