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cgdrawshapes.pro
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cgdrawshapes.pro
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; docformat = 'rst'
;
; NAME:
; cgDrawShapes
;
; PURPOSE:
; Draws entities in a shapefile, containing latitude and longitude polygons
; or polylines, on a map projection. To draw the shapefile entities
; automatically, no matter what kind of values the polygon vertices
; have, set the AUTODRAW keyword.
;
;******************************************************************************************;
; ;
; Copyright (c) 2011, by Fanning Software Consulting, Inc. All rights reserved. ;
; ;
; Redistribution and use in source and binary forms, with or without ;
; modification, are permitted provided that the following conditions are met: ;
; ;
; * Redistributions of source code must retain the above copyright ;
; notice, this list of conditions and the following disclaimer. ;
; * Redistributions in binary form must reproduce the above copyright ;
; notice, this list of conditions and the following disclaimer in the ;
; documentation and/or other materials provided with the distribution. ;
; * Neither the name of Fanning Software Consulting, Inc. nor the names of its ;
; contributors may be used to endorse or promote products derived from this ;
; software without specific prior written permission. ;
; ;
; THIS SOFTWARE IS PROVIDED BY FANNING SOFTWARE CONSULTING, INC. ''AS IS'' AND ANY ;
; EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES ;
; OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT ;
; SHALL FANNING SOFTWARE CONSULTING, INC. BE LIABLE FOR ANY DIRECT, INDIRECT, ;
; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED ;
; TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; ;
; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ;
; ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ;
; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS ;
; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ;
;******************************************************************************************;
;
;+--------------------------------------------------------------------------
; This program draws the entities in a shapefile, containing latitude and
; longitude polygons or polylines, on a map projection. To draw the shapefile
; entities automatically, no matter what kind of values the polygon vertices
; have, and without a map projection, set the AUTODRAW keyword.
;
; It is assumed a map projection command has been issued and is in effect at
; the time this program is called. Alternatively, you can use a cgMap object,
; which will set up the map coordinate space and provide the map structure required
; for plotting in that XY map coordinate space.
;
; If the ATTRVALUES keyword is undefined, all entities are drawn, but only a single value
; for COLORS, FCOLORS, FILL, LINESTYLE, and THICK is allowed.
;
; .. image:: cgdrawshapes.png
;
; :Categories:
; Graphics, Map Projections
;
; :Author:
; FANNING SOFTWARE CONSULTING::
; David W. Fanning
; 1645 Sheely Drive
; Fort Collins, CO 80526 USA
; Phone: 970-221-0438
; E-mail: [email protected]
; Coyote's Guide to IDL Programming: http://www.idlcoyote.com
;
; :Examples:
; Example using cgMap_Set to set up the map projection space::
; shapefile = Filepath(subdir=['examples','data'], 'states.shp')
; cgDisplay, 800, 700
; cgMap_Set, 40.0, -117.5, /Albers, /IsoTropic, Limit=[30, -125, 50, -108], $
; Position=[0.05, 0.05, 0.95, 0.95]
; cgDrawShapes, shapefile, AttrName='STATE_ABBR', $
; AttrValues=['CA', 'OR', 'WA', 'AZ', 'UT', 'ID', 'NV'], Thick=1, $
; FColors=['firebrick', 'grn4', 'pur4', 'tan4', 'steel blue', 'org4', 'yellow'], $
; Fill = Replicate(1, 7), Colors='charcoal'
; cgMap_Grid, LatDel = 2.0, LonDel = 2.0, /Box_Axes, Color='charcoal'
;
; Example using cgMap to set up the map projection space::
;
; shapefile = Filepath(subdir=['examples','data'], 'states.shp')
; cgDisplay, 800, 700, WID=1
; mapCoord = Obj_New('cgMap', 'Albers Equal Area', Limit=[30, -125, 50, -108], $
; Position=[0.2, 0.05, 0.8, 0.95], CENTER_LATITUDE=40.0, $
; CENTER_LONGITUDE=-117, STANDARD_PAR1=40, STANDARD_PAR2=-39)
; cgDrawShapes, shapefile, AttrName='STATE_ABBR', $
; AttrValues=['CA', 'OR', 'WA', 'AZ', 'UT', 'ID', 'NV'], Thick=1, $
; FColors=['firebrick', 'grn4', 'pur4', 'tan4', 'steel blue', 'org4', 'yellow'], $
; Fill = Replicate(1, 7), Colors='charcoal', MapCoord=mapCoord, /USELIMIT
; cgMap_Grid, /Box_Axes, Color='charcoal', Map_Structure=mapCoord
;
; Example drawing the states.shp file automatically, without a map projection::
;
; shapefile = Filepath(subdir=['examples','data'], 'states.shp')
; cgDrawShapes, shapefile, /Autodraw
;
; Example using cgMap to set up the map projection space in a resizeable graphics window::
;
; shapefile = Filepath(subdir=['examples','data'], 'states.shp')
; cgWindow, WAspect=800.0/700
; mapCoord = Obj_New('cgMap', 'Albers Equal Area', LIMIT=[30, -125, 45, -108], $
; Position=[0.05, 0.05, 0.95, 0.95], CENTER_LATITUDE=37.5, $
; CENTER_LONGITUDE=-117, STANDARD_PAR1=40, STANDARD_PAR2=-39)
; mapCoord -> AddCmd
; cgDrawShapes, shapefile, AttrName='STATE_ABBR', $
; AttrValues=['CA', 'OR', 'WA', 'AZ', 'UT', 'ID', 'NV'], Thick=1, $
; FColors=['firebrick', 'grn4', 'pur4', 'tan4', 'steel blue', 'org4', 'yellow'], $
; Fill = Replicate(1, 7), Colors='charcoal', MapCoord=mapCoord, /AddCmd
; cgMap_Grid, LatDel = 2.0, LonDel = 2.0, /Box_Axes, Color=cgColor('charcoal'), $
; Map_Structure=mapCoord, /AddCmd
;
; :History:
; Modification History::
; Written by David W. Fanning by modifiying DrawStates to be more
; general, 13 May 2010. DWF.
; Added the AUTODRAW keyword for automatic drawing. 15 May 2010. DWF.
; Added COMPILE_OPT idl2 to make sure all loop variables are longs. 5 July 2010. DWF.
; Corrected an aspect ratio problem with AUTODRAW and upgraded to Coyote Graphics.
; 3 January 2011. DWF.
; Previous method of freeing entity pointers took 10 times times longer than freeing
; pointers as I go. Also added MinNumVerts keyword to screen out the drawing of
; small polygons. 6 October 2011. DWF.
; Wrong string case for discovering particular attributes caused them not to be drawn. 27 Oct 2011. DWF.
; Added the ability to draw point shapefiles. Changed default color to "opposite". 20 Aug 2012. DWF.
; Made sure a window is open when the default color is chosen. 29 Aug 2012. DWF.
; Added a DrawMapCoord keyword so that shapes in a different map projection can be drawn on
; a map correctly. 29 Nov 2013. DWF.
; Changed the default value of the USELIMIT keyword to 1. Mostly, because I've been burned too many
; times to think a default value of 0 makes sense. 29 Nov 2013. DWF.
;
; :Copyright:
; Copyright (c) 2011-2013, Fanning Software Consulting, Inc.
;---------------------------------------------------------------------------
;
;+
; Draw the shape file entity on the map projection.
;
; :Params:
; entity: in, required, type=structure
; The shapefile entity that is read out of the shape file. In should be
; a polygon or a polyline.
;
; :Keywords:
; color: in, required, type=string
; The name of the color used to draw the entity. Used as fill color
; for filled symbols when drawing points.
; fcolor: in, required, type=string
; The name of the color used to fill the entity. Used if the FILL
; keyword is set.
; fill: in, required, type=boolean
; Set this keyword to fill the entity with a color.
; linestyle: in, required, type=integer
; Set this keyword to the line style type to draw the entity.
; mapCoord: in, required, type=object
; A map coordinate object (e.g., cgMap). Required to draw the
; entity on a GCTP map projection set up with MAP_PROJ_INIT.
; projected_xy: in, required, type=boolean, default=0
; The program assumes the shapefile entities are expressed in latitude and
; longitude values. If the entiites are expressed in projected XY Cartesian
; coordinates, then set this value.
; psym: in, optional, type=integer, default=16
; When drawing points, the symbol to use. May be any value supported by
; cgSymbol. The default is a filled circle, filled with `Colors`.
; symsize: in, optional, type=float, default=1.0
; The default symbol size. Used only when displaying points.
; thick: in, required, type=integer
; The thickness of the line used to draw the entity.
;-
PRO cgDrawShapes_DrawEntity, entity, $
COLOR=color, $
DRAWMAPCOORD=drawMapCoord, $
FCOLOR=fcolor, $
FILL=fill, $
LINESTYLE=linestyle, $
MAPCOORD=mapCoord, $
PROJECTED_XY=projected_xy, $
PSYM=psym, $
SYMSIZE=symsize, $
THICK=thick
Compile_Opt idl2
; Error handling.
Catch, theError
IF theError NE 0 THEN BEGIN
ok = cgErrorMsg(/Traceback)
IF Obj_Valid(shapefile) THEN Obj_Destroy, shapefile
IF Ptr_Valid(entities) THEN Heap_Free, entities
RETURN
ENDIF
; Drawing is going to be done based on the shape type.
CASE 1 OF
; Polygon shapes.
entity.shape_type EQ 5 OR $ ; Polygon.
entity.shape_type EQ 15 OR $ ; PolygonZ (ignoring Z)
entity.shape_type EQ 25: BEGIN ; PolygonM (ignoring M)
IF Ptr_Valid(entity.parts) THEN BEGIN
cuts = [*entity.parts, entity.n_vertices]
FOR j=0, entity.n_parts-1 DO BEGIN
IF N_Elements(mapCoord) NE 0 THEN BEGIN
IF Obj_Valid(drawMapCoord) THEN drawMapCoord -> Draw, /NoGraphics
IF projected_xy THEN BEGIN
x = Reform((*entity.vertices)[0, cuts[j]:cuts[j+1]-1])
y = Reform((*entity.vertices)[1, cuts[j]:cuts[j+1]-1])
; Do you need to transform the coordinates to the drawing map projection space?
IF mapCoord NE drawMapCoord THEN BEGIN
ll = mapCoord -> Inverse(x, y)
xy = drawMapCoord -> Forward(ll[0,*], ll[1,*], /NoForwardFix)
x = Reform(xy[0,*])
y = Reform(xy[1,*])
ENDIF
ENDIF ELSE BEGIN
xy = drawMapCoord -> Forward((*entity.vertices)[0, cuts[j]:cuts[j+1]-1], $
(*entity.vertices)[1, cuts[j]:cuts[j+1]-1], $
/NoForwardFix)
x = Reform(xy[0,*])
y = Reform(xy[1,*])
ENDELSE
ENDIF ELSE BEGIN
x = (*entity.vertices)[0, cuts[j]:cuts[j+1]-1]
y = (*entity.vertices)[1, cuts[j]:cuts[j+1]-1]
ENDELSE
CASE fill OF
0: cgPlotS, x, y, COLOR=color, LINESTYLE=linestyle, THICK=thick, NOCLIP=0
1: BEGIN
cgColorFill, x, y, COLOR=fcolor, NOCLIP=0
cgPlotS, x, y, COLOR=color, LINESTYLE=linestyle, THICK=thick, NOCLIP=0
END
ENDCASE
ENDFOR
ENDIF
ENDCASE ; Polygon shapes.
; Polyline shapes.
entity.shape_type EQ 3 OR $ ; PolyLine
entity.shape_type EQ 13 OR $ ; PolyLineZ (ignoring Z)
entity.shape_type EQ 23: BEGIN ; PolyLineM (ignoring M)
IF Ptr_Valid(entity.parts) THEN BEGIN
cuts = [*entity.parts, entity.n_vertices]
FOR j=0, entity.n_parts-1 DO BEGIN
IF N_Elements(mapCoord) NE 0 THEN BEGIN
IF Obj_Valid(mapCoord) THEN BEGIN
mapCoord -> Draw
mapStruct = mapCoord->GetMapStruct()
ENDIF ELSE mapStruct = mapCoord
xy = Map_Proj_Forward((*entity.vertices)[0, cuts[j]:cuts[j+1]-1], $
(*entity.vertices)[1, cuts[j]:cuts[j+1]-1], $
MAP_STRUCTURE=mapStruct)
x = Reform(xy[0,*])
y = Reform(xy[1,*])
ENDIF ELSE BEGIN
x = (*entity.vertices)[0, cuts[j]:cuts[j+1]-1]
y = (*entity.vertices)[1, cuts[j]:cuts[j+1]-1]
ENDELSE
CASE fill OF
0: cgPlotS, x, y, COLOR=color, LINESTYLE=linestyle, THICK=thick, NOCLIP=0
1: BEGIN
cgColorFill, x, y, COLOR=fcolor, NOCLIP=0
cgPlotS, x, y, COLOR=color, LINESTYLE=linestyle, THICK=thick, NOCLIP=0
END
ENDCASE
ENDFOR
ENDIF
ENDCASE ; Polyline shapes.
; Various kinds of points.
entity.shape_type eq 1 or $ ; Point
entity.shape_type eq 11 or $ ; PointZ (ignoring Z)
entity.shape_type eq 21 or $ ; PointM (ignoring M)
entity.shape_type eq 8 or $ ; MultiPoint
entity.shape_type eq 18 or $ ; MultiPointZ (ignoring Z)
entity.shape_type eq 28: BEGIN ; MultiPointM (ignoring M)
IF N_Elements(mapCoord) NE 0 THEN BEGIN
IF Obj_Valid(mapCoord) THEN BEGIN
mapCoord -> Draw
mapStruct = mapCoord->GetMapStruct()
ENDIF ELSE mapStruct = mapCoord
IF Keyword_Set(projected_xy) THEN BEGIN
xy = Map_Proj_Forward(entity.bounds[0], entity.bounds[1], $
MAP_STRUCTURE=mapStruct)
x = Reform(xy[0,*])
y = Reform(xy[1,*])
cgPlotS, x, y, PSYM=psym, COLOR=color, SYMSIZE=symsize, THICK=thick
ENDIF ELSE BEGIN
cgPlotS, entity.bounds[0], entity.bounds[1], $
PSYM=psym, COLOR=color, SYMSIZE=symsize, THICK=thick
ENDELSE
ENDIF ELSE BEGIN
cgPlotS, entity.bounds[0], entity.bounds[1], $
PSYM=psym, COLOR=color, SYMSIZE=symsize, THICK=thick
ENDELSE
ENDCASE
ELSE: Message, 'Not currently handling entity type: ' + StrTrim(entity.shape_type,2)
ENDCASE
END ;---------------------------------------------------------------------------------
;+
; This program draws the entities in a shapefile, containing latitude and
; longitude points, polygons, polylines, or polypoings on a map projection.
; Values may also be in projected meter space, if the proper map coordinate
; object is passed to the program (e.g, via the MapCoord keyword). To draw the shapefile
; entities automatically, no matter what kind of values the polygon vertices
; or points have, and without a map projection, set the AUTODRAW keyword.
;
; :Params:
; shapefile: in, optional, type=string
; The name of a shapefile. If this variable is not provided, the user will
; be asked to select a shapefile with the normal file dialogs.
;
; :Keywords:
; addcmd: in, optional, type=boolean
; Set this keyword to add the command to a cgWindow.
; autodraw: in, optional, type=boolean
; If set, the shapefile entities are examined to find the X and Y
; boundaries and a data coordinate space is set up to display the
; entities automatically. If the shapefile is drawn automatically,
; the restriction that the shapefile vertices be in latitude and
; longitude values is removed. Do NOT set this keyword, if you
; are using the MAPCOORD keyword, too. If no map projection is
; currently in effect (!X.TYPE NE 3) and no map coordinate object
; has been provided, this keyword is automatically set.
; attrname: in, optional, type=string
; The name of the attribute in the file that you wish to draw.
; By default, this is set to the first attribute name in the file.
; If you are unsure of the attribute names in your shapefile,
; use the Coyote Library program `cgShapeInfo` to browse the file
; ahead of time.
; attrvalues: in, optional, type=varies
; The value of the attribute identified by ATTRNAME. This variable can
; be a scalar or vector string array identifying a subset of attribute
; values to be drawn. For example, if ATTRNAME='STATE_NAME', then
; ATTRVALUE can identify the particular states to draw. For example,
; ATTRVALUE=['ARIZONA', 'WYOMING', 'OREGON']. By default, the value
; is "ALL", which means that all of the shape entities identified by
; ATTRNAME will be drawn.
; colors: in, optional, type=string, default="opposite"
; The name of the color or colors used to draw the entity. This
; may be a string array of the same size as ATTRVALUES.
; drawmapcoord: in, optional, type=object
; A map coordinate object (e.g., cgMap) that describes the map projection
; and datum on which the shapes in the shapefile will be drawn. If not
; supplied, the map coordinate object passed with the `mapCoord` keyword will
; be used. Use this keyword only if there is a mismatch in the map projection and
; datum used in the shapefile and the the map projection and datum that the shape
; is to be drawn onto.
; fcolors: in, optional, type=string
; The name of the color used to fill the entity. Used if the FILL
; keyword is set. By default, the same as the COLORS keyword.
; fill: in, optional, type=boolean
; Set this keyword to fill the entity with a color.
; linestyle: in, optional, type=integer, default=0
; The normal linestyle keyword index to choose plotting line styles.
; By default, set to 0 and solid lines. May be a vector of the same
; size as ATTRVALUES.
; mapCoord: in, optional, type=object
; A map coordinate object (e.g., cgMap) that describes the map projection
; and datum used in the shapefile. If `drawMapCoord` is not used, this is also
; the map coordinate system used for drawing the shape or shapes in the file.
; This keyword is required to draw the shapes on a GCTP map projection set up
; with MAP_PROJ_INIT. Note that this could also be a map structure as returned
; from MAP_PROJ_INIT, but in that case the user is responsible for setting up the
; XY map coordinate space independently and outside of this program.
; minnumverts: in, optional, type=long, default=3
; Set this keyword to the minimum number of vertices required to actually
; draw a polygon. In other words, to to drawn, a polygon must have at least
; this number of vertices.
; projected_xy: in, optional, type=boolean, default=0
; The program assumes the shapefile entities are expressed in latitude and
; longitude values. If the entiites are expressed in projected XY Cartesian
; coordinates, then set this value.
; psym: in, optional, type=integer, default=16
; When drawing points, the symbol to use. May be any value supported by
; cgSymbol. The default is a filled circle, filled with `Colors`.
; symsize: in, optional, type=float, default=1.0
; The default symbol size. Used only when displaying points.
; thick: in, optional, type=integer, default=1
; The thickness of the line used to draw the entity.
; uselimit: in, optional, type=boolean, default=1
; Set this keyword to use the LIMIT as determined from the map coordinate object.
; This keyword applies only if a valid `MapCoord` object is passed to the program.
; window: in, optional, type=boolean, default=0
; Set this keyword to add this command to a current cgWindow program. If a
; cgWindow doesn't exist, one is created.
;-
PRO cgDrawShapes, shapeFile, $
ADDCMD=addcmd, $
AUTODRAW=autodraw, $
ATTRNAME=attrname, $
ATTRVALUES=attrvalues, $
COLORS=colors, $
DRAWMAPCOORD=drawMapCoord, $
FCOLORS=fcolors, $
FILL=fill, $
LINESTYLE=linestyle, $
MAPCOORD=mapCoord, $
MINNUMVERTS=minNumVerts, $
PROJECTED_XY=projected_xy, $
PSYM=psym, $
SYMSIZE=symsize, $
THICK=thick, $
USELIMIT=uselimit, $
WINDOW=window
Compile_Opt idl2
; Error handling.
Catch, theError
IF theError NE 0 THEN BEGIN
ok = cgErrorMsg()
IF Obj_Valid(shapefile) THEN Obj_Destroy, shapefile
IF Ptr_Valid(entities) THEN Heap_Free, entities
RETURN
ENDIF
; A flag to allow graphics windows to be open.
nowindows = ((!D.FLAGS AND 256) EQ 0)
; Replace the commands in or create a cgWindow.
IF Keyword_Set(window) THEN BEGIN
currentWindow = cgQuery(/CURRENT, COUNT=wincnt)
IF wincnt EQ 0 THEN cgWindow
cgWindow, 'cgDrawShapes', shapeFile, $
AUTODRAW=autodraw, $
ATTRNAME=attrname, $
ATTRVALUES=attrvalues, $
COLORS=colors, $
DRAWMAPCOORD=drawMapCoord, $
FCOLORS=fcolors, $
FILL=fill, $
LINESTYLE=linestyle, $
MAPCOORD=mapCoord, $
MINNUMVERTS=minNumVerts, $
PROJECTED_XY=projected_xy, $
PSYM=psym, $
SYMSIZE=symsize, $
THICK=thick, $
USELIMIT=uselimit, $
REPLACECMD=1
RETURN
ENDIF
; Add this command to the current graphics window?
IF Keyword_Set(addcmd) THEN BEGIN
cgWindow, 'cgDrawShapes', shapeFile, $
AUTODRAW=autodraw, $
ATTRNAME=attrname, $
ATTRVALUES=attrvalues, $
COLORS=colors, $
DRAWMAPCOORD=drawMapCoord, $
FCOLORS=fcolors, $
FILL=fill, $
LINESTYLE=linestyle, $
MAPCOORD=mapCoord, $
MINNUMVERTS=minNumVerts, $
PROJECTED_XY=projected_xy, $
PSYM=psym, $
SYMSIZE=symsize, $
THICK=thick, $
USELIMIT=uselimit, $
ADDCMD=1
RETURN
ENDIF
; If a graphics window isn't open, open one now. Necessary to make
; sure the drawing is not done white on white.
IF ~noWindows AND (!D.Window EQ -1) THEN cgDisplay
; Check parameters.
IF N_Elements(shapeFile) EQ 0 THEN BEGIN
shapeFile = Filepath(Subdirectory=['examples', 'data'], 'states.shp')
IF File_Test(shapeFile) THEN BEGIN
shapeFile = Dialog_Pickfile(FILE=shapefile, FILTER='*.shp')
IF shapeFile EQ "" THEN RETURN
ENDIF ELSE BEGIN
shapeFile = Dialog_Pickfile(FILTER='*.shp')
IF shapeFile EQ "" THEN RETURN
ENDELSE
ENDIF
IF N_Elements(colors) EQ 0 THEN colors = 'opposite'
IF N_Elements(fcolors) EQ 0 THEN fcolors = colors
fastColors = cgColor(colors)
fastFillColors = cgColor(fcolors)
IF N_Elements(fill) EQ 0 THEN fill = Keyword_Set(fill)
IF N_Elements(linestyle) EQ 0 THEN linestyle = 0
IF N_Elements(psym) EQ 0 THEN psym = 16
IF N_Elements(symsize) EQ 0 THEN symsize = 1.0
IF N_Elements(thick) EQ 0 THEN thick = 1.0
IF N_Elements(minNumVerts) EQ 0 THEN minNumVerts = 3
projected_xy = Keyword_Set(projected_xy)
IF N_Elements(attrvalues) EQ 0 THEN attrvalues = 'ALL'
; Is there a map projection in effect, or do I have a map coordinate object
; to create one? If not, then turn autodraw mode on.
IF (!X.Type NE 3) && (N_Elements(mapCoord) EQ 0) THEN autodraw = 1
; Make sure arrays have the same number of elements.
IF N_Elements(attrvalues) NE 1 THEN BEGIN
numEntities = N_Elements(attrvalues)
IF N_Elements(fastColors) EQ 1 THEN fastColors = Replicate(fastColors, numEntities)
IF N_Elements(fastColors) NE numEntities THEN $
Message, 'Number of COLORS does not match number of entity names.'
IF N_Elements(fastFillColors) EQ 1 THEN fastFillColors = Replicate(fastFillColors, numEntities)
IF N_Elements(fastFillColors) NE numEntities THEN $
Message, 'Number of FCOLORS does not match number of entity names.'
IF N_Elements(fill) EQ 1 THEN fill = Replicate(fill, numEntities)
IF N_Elements(fill) NE numEntities THEN $
Message, 'Number of FILL values does not match number of entity names.'
IF N_Elements(linestyle) EQ 1 THEN linestyle = Replicate(linestyle, numEntities)
IF N_Elements(linestyle) NE numEntities THEN $
Message, 'Number of LINESTYLE values does not match number of entity names.'
IF N_Elements(psym) EQ 1 THEN psym = Replicate(psym, numEntities)
IF N_Elements(psym) NE numEntities THEN $
Message, 'Number of PSYM values does not match number of entity names.'
IF N_Elements(symsize) EQ 1 THEN symsize = Replicate(symsize, numEntities)
IF N_Elements(symsize) NE numEntities THEN $
Message, 'Number of SYMSIZE values does not match number of entity names.'
IF N_Elements(thick) EQ 1 THEN thick = Replicate(thick, numEntities)
IF N_Elements(thick) NE numEntities THEN $
Message, 'Number of THICK values does not match number of entity names.'
ENDIF
; Open the shape file and create the shape object.
shapefileObj = Obj_New('IDLffShape', shapeFile)
IF Obj_Valid(shapefileObj) EQ 0 THEN $
Message, 'Unable to create shape file object. Returning...'
; Make sure you have a default attribute name. If you don't have
; one, get the first attribute name from the file.
IF N_Elements(attrname) EQ 0 THEN BEGIN
shapefileObj -> GetProperty, ATTRIBUTE_NAMES=theNames
theNames = StrUpCase(StrTrim(theNames, 2))
attrname = theNames[0]
ENDIF ELSE attrname = StrUpCase(attrname)
; Get the attribute names from the shape file.
IF N_Elements(theNames) EQ 0 THEN BEGIN
shapefileObj -> GetProperty, ATTRIBUTE_NAMES=theNames
theNames = StrUpCase(StrTrim(theNames, 2))
ENDIF
; Find the attribute index.
attIndex = Where(theNames EQ attrname, count)
IF count EQ 0 THEN Message, 'Unable to find attribute ' + attrname + ' in file. Returning...'
; Get all the attribute pointers from the file. These are the entities.
entities = Ptr_New(/Allocate_Heap)
*entities = shapefileObj -> GetEntity(/All, /Attributes)
; Automatic drawing turned on and no map coordinate?
; Then set up a drawing window with a data
; coordinate system established.
IF Keyword_Set(autodraw) AND N_Elements(mapCoord) EQ 0 THEN BEGIN
entityMinX = FltArr(N_Elements(*entities))
entityMaxX = FltArr(N_Elements(*entities))
entityMiny = FltArr(N_Elements(*entities))
entityMaxY = FltArr(N_Elements(*entities))
FOR j=0,N_Elements(*entities)-1 DO BEGIN
thisEntity = (*entities)[j]
entityMinX[j] = thisEntity.bounds[0]
entityMaxX[j] = thisEntity.bounds[4]
entityMiny[j] = thisEntity.bounds[1]
entityMaxY[j] = thisEntity.bounds[5]
ENDFOR
xrange = [Min(entityMinX), Max(entityMaxX)]
yrange = [Min(entityMinY), Max(entityMaxY)]
cgPlot, xrange, yrange, XSTYLE=5, YSTYLE=5, Position=[0.05, 0.05, 0.95, 0.95], /NoData
cgPlotS, [!X.Window[0], !X.Window[0], !X.Window[1], !X.Window[1], !X.Window[0]], $
[!Y.Window[0], !Y.Window[1], !Y.Window[1], !Y.Window[0], !Y.Window[0]], $
/NORMAL, Color='opposite', THICK=2
; Print, 'X Range: ', xrange, Format='(a10, f12.2, 2x, f12.2)'
; Print, 'Y Range: ', yrange, Format='(a10, f12.2, 2x, f12.2)'
ENDIF
; If you have a map coordinate, then set the data range appropriately.
IF Obj_Valid(mapCoord) THEN BEGIN
IF Obj_Valid(drawMapCoord) EQ 0 THEN drawMapCoord = mapCoord
; This is only necessary, if a LIMIT wasn't specified.
IF N_Elements(uselimit) EQ 0 THEN uselimit = 1
IF ~uselimit THEN BEGIN
entityMinX = FltArr(N_Elements(*entities))
entityMaxX = FltArr(N_Elements(*entities))
entityMiny = FltArr(N_Elements(*entities))
entityMaxY = FltArr(N_Elements(*entities))
FOR j=0,N_Elements(*entities)-1 DO BEGIN
thisEntity = (*entities)[j]
entityMinX[j] = thisEntity.bounds[0]
entityMaxX[j] = thisEntity.bounds[4]
entityMiny[j] = thisEntity.bounds[1]
entityMaxY[j] = thisEntity.bounds[5]
ENDFOR
xrange = [Min(entityMinX), Max(entityMaxX)]
yrange = [Min(entityMinY), Max(entityMaxY)]
mapCoord -> SetProperty, XRANGE=xrange, YRANGE=yrange
ENDIF
ENDIF
; Cycle through each entity and draw it, if required. Free each pointer
; as you go, because it take at least 10 times as long to free them with
; HEAP_FREE at the end if you don't do this!
FOR j=0,N_Elements(*entities)-1 DO BEGIN
thisEntity = (*entities)[j]
theEntityName = StrUpCase(StrTrim((*thisEntity.attributes).(attIndex), 2))
index = Where(StrUpCase(attrvalues) EQ theEntityName, test)
IF attrvalues[0] EQ 'ALL' THEN BEGIN
index = 0
test = 1
ENDIF
IF (test EQ 1) THEN BEGIN
IF Ptr_Valid(thisEntity.vertices) THEN BEGIN
IF (N_Elements(*thisEntity.vertices) GE minNumVerts) THEN BEGIN
cgDrawShapes_DrawEntity, (*entities)[j], COLOR=(fastColors[index])[0], $
DRAWMAPCOORD=drawMapCoord, $
Fill=(fill[index])[0], LINESTYLE=(linestyle[index])[0], $
THICK=(thick[index])[0], PROJECTED_XY=projected_xy, $
MAPCOORD=mapCoord, FCOLOR=(fastFillColors[index])[0]
ENDIF
ENDIF ELSE BEGIN
cgDrawShapes_DrawEntity, (*entities)[j], COLOR=(fastColors[index])[0], $
PSYM=(psym[index])[0], THICK=(thick[index])[0], $
PROJECTED_XY=projected_xy, MapCoord=mapCoord, SYMSIZE=(symsize[index])[0]
ENDELSE
ENDIF
Ptr_Free, thisEntity.vertices
Ptr_Free, thisEntity.measure
Ptr_Free, thisEntity.parts
Ptr_Free, thisEntity.part_types
Ptr_Free, thisEntity.attributes
ENDFOR
; Clean up.
Obj_Destroy, shapefileObj
Ptr_Free, entities
END ;---------------------------------------------------------------------------------