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cgkml_screenoverlay__define.pro
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cgkml_screenoverlay__define.pro
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; docformat = 'rst'
;
; NAME:
; cgKML_ScreenOverlay
;
; PURPOSE:
; This program implements the KML ScreenOverlay element. A ScreenOverlay element draws
; an image onto the Google Earth display or screen.
;
;******************************************************************************************;
; ;
; Copyright (c) 2012, 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 implements the KML ScreenOverlay element. For
; reference, see the `Google KML Reference Documentation <https://developers.google.com/kml/documentation/kmlreference#ScreenOverlay>`.
; A ScreenOverlay element draws an image onto the Google Earth display or screen.
;
; :Categories:
; Graphics, FileIO
;
; :Examples:
; See the `cgKML_File` object for examples of how to create a KML file.
;
;
; :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
;
; :History:
; Change History::
; Written, 3 November 2012 by David W. Fanning.
;
; :Copyright:
; Copyright (c) 2012, Fanning Software Consulting, Inc.
;-
;+
; The purpose of this method is to establish an abstract KML ScreenOverlay class. For reference, see
; https://developers.google.com/kml/documentation/kmlreference?hl=fr#ScreenOverlay.
;
; :Keywords:
; color: in, optional, type=string
; Color values are expressed in hexadecimal notation, including opacity (alpha) values.
; The order of expression is alpha, blue, green, red (aabbggrr). The range of values for
; any one color is 0 to 255 (00 to ff). For opacity, 00 is fully transparent and ff is
; fully opaque. For example, if you want to apply a blue color with 50 percent opacity
; to an overlay, you would specify the following: COLOR = "7fff0000".
; draworder: in, optional, type=integer
; This element defines the stacking order for the images in overlapping overlays.
; Overlays with higher values are drawn on top of overlays with lower values.
; href: in, optional, type=string
; A URL that identifies the location of the image associated with this Overlay. The
; location can be either a local file (e.g., 'myimage.png') or a URL to an image
; on a web server (e.g., 'http://www.idlcoyote.com/images/myimage.png').
; overlay_xy: in, required, type=dblarr
; This keyword specifies a point [x,y] in the image overlay that is mapped to the
; screen coordinate `Screen_XY`. The location of the point is specified by the values
; in `Overlay_Units_X` and 'Overlay_Units_Y`.
; overlay_unit_x: in, optional, type=string, default='fraction'
; Three values are possible: (1) "fraction" indicates that the X value is a fraction of the image;
; (2) "pixels" indicates the the X value is in pixels; and (3) "insetPixels" indicates the X
; value is an indent from the right edge of the image.
; overlay_unit_y: in, optional, type=string, default='fraction'
; Three values are possible: (1) "fraction" indicates that the Y value is a fraction of the image;
; (2) "pixels" indicates the the Y value is in pixels; and (3) "insetPixels" indicates the Y
; value is an indent from the top edge of the image.
; rotation: in, optional, type=double, default=0.0
; This keyword indicates the angle of rotation of the screen overlay in degrees counterclockwise
; from North. A value from -180 to 180.
; screen_xy: in, optional, type=dblarr
; This keyword specifies a point [x,y] relative to the screen origin that the overlay image
; is mapped to. The location of the point is specified by the values in `XUnits` and 'YUnits`.
; screen_unit_x: in, optional, type=string, default='fraction'
; Three values are possible: (1) "fraction" indicates that the X value is a fraction of the image;
; (2) "pixels" indicates the the X value is in pixels; and (3) "insetPixels" indicates the X
; value is an indent from the right edge of the image.
; screen_unit_y: in, optional, type=string, default='fraction'
; Three values are possible: (1) "fraction" indicates that the Y value is a fraction of the image;
; (2) "pixels" indicates the the Y value is in pixels; and (3) "insetPixels" indicates the Y
; value is an indent from the top edge of the image.
; size_xy: in, required, type=dblarr
; This keyword specifies the size of the image for the screen overlay as follows. A -1
; indicates to use the native dimensions of the image. A 0 indicates that the aspect ratio
; of the image should be preserved. Any other value sets the output dimension of the image,
; according to the "unit" values.
; size_unit_x: in, optional, type=string, default='fraction'
; Three values are possible: (1) "fraction" indicates that the X value is a fraction of the image;
; (2) "pixels" indicates the the X value is in pixels; and (3) "insetPixels" indicates the X
; value is an indent from the right edge of the image.
; size_unit_y: in, optional, type=string, default='fraction'
; Three values are possible: (1) "fraction" indicates that the Y value is a fraction of the image;
; (2) "pixels" indicates the the Y value is in pixels; and (3) "insetPixels" indicates the Y
; value is an indent from the top edge of the image.
; _ref_extra: in, optional
; Any keywords appropriate for superclass objects may be passed into the program.
;-
FUNCTION cgKML_ScreenOverlay::INIT, $
COLOR=color, $
DRAWORDER=draworder, $
HREF=href, $
OVERLAY_XY=overlay_xy, $
OVERLAY_UNIT_X=overlay_unit_x, $
OVERLAY_UNIT_Y=overlay_unit_y, $
SCREEN_XY=screen_xy, $
SCREEN_UNIT_X=screen_unit_x, $
SCREEN_UNIT_Y=screen_unit_y, $
SIZE_XY=size_xy, $
SIZE_UNIT_X=size_unit_x, $
SIZE_UNIT_Y=size_unit_y, $
ROTATION=rotation, $
_REF_EXTRA=extra
Compile_Opt idl2
; Error handling.
Catch, theError
IF theError NE 0 THEN BEGIN
Catch, /CANCEL
void = cgErrorMsg()
RETURN, 0
ENDIF
; Call the superclass object's INIT method.
IF ~self -> cgKML_Overlay::INIT(COLOR=color, DRAWORDER=draworder, HREF=href, _Extra=extra) THEN RETURN, 0
; Check optional parameters.
IF Total(N_Elements(overlay_xy) + N_Elements(overlay_unit_x) + N_Elements(overlay_unit_y)) EQ 0 THEN BEGIN
overlay_xy = [0.0, 1.0]
overlay_unit_x = 'fraction'
overlay_unit_y = 'fraction'
ENDIF
IF Total(N_Elements(screen_xy) + N_Elements(screen_unit_x) + N_Elements(screen_unit_y)) EQ 0 THEN BEGIN
screen_xy = [0.025, 0.975]
screen_unit_x = 'fraction'
screen_unit_y = 'fraction'
ENDIF
IF Total(N_Elements(size_xy) + N_Elements(size_unit_x) + N_Elements(size_unit_y)) EQ 0 THEN BEGIN
size_xy = [0, 0]
size_unit_x = 'fraction'
size_unit_y = 'fraction'
ENDIF
IF N_Elements(overlay_unit_x) EQ 0 THEN overlay_unit_x = 'fraction'
IF N_Elements(overlay_unit_y) EQ 0 THEN overlay_unit_y = 'fraction'
IF N_Elements(screen_unit_x) EQ 0 THEN screen_unit_x = 'fraction'
IF N_Elements(screen_unit_y) EQ 0 THEN screen_unit_y = 'fraction'
IF N_Elements(size_unit_x) EQ 0 THEN size_unit_x = 'fraction'
IF N_Elements(size_unit_y) EQ 0 THEN size_unit_y = 'fraction'
IF N_Elements(size_xy) EQ 0 THEN size_xy = [-1,-1]
IF N_Elements(rotation) EQ 0 THEN rotation = 0.0
; Check required parameters.
IF N_Elements(overlay_xy) EQ 0 THEN Message, 'An Overlay_XY point is required.'
IF N_Elements(screen_xy) EQ 0 THEN Message, 'An Screen_XY point is required.'
; Load the object.
self.overlay_xy = overlay_xy
self.overlay_unit_x = overlay_unit_x
self.overlay_unit_y = overlay_unit_y
self.screen_xy = screen_xy
self.screen_unit_x = screen_unit_x
self.screen_unit_y = screen_unit_y
self.size_xy = size_xy
self.size_unit_x = size_unit_x
self.size_unit_y = size_unit_y
self.rotation = rotation
RETURN, 1
END
;+
; This method opens the <ScreenOverlay> tag in the KML file.
;
; :Keywords:
; lun: in, required, type=integer
; The logical unit number of the open KML file to write to.
;-
PRO cgKML_ScreenOverlay::Head, LUN=lun
Compile_Opt idl2
Catch, theError
IF theError NE 0 THEN BEGIN
Catch, /CANCEL
void = cgErrorMsg()
RETURN
ENDIF
; We require a logical unit number.
IF N_Elements(lun) EQ 0 THEN Message, 'A logical unit number (LUN) is required in this method.'
; Write the overlay elements.
IF self.id NE "" THEN BEGIN
PrintF, lun, ' <ScreenOverlay id="' + StrTrim(self.id,2) + '">'
ENDIF ELSE BEGIN
PrintF, lun, ' <ScreenOverlay>'
ENDELSE
END
;+
; This method adds ScreenOverlay elements to the KML file.
;
; :Keywords:
; lun: in, required, type=integer
; The logical unit number of the open KML file to write to.
;-
PRO cgKML_ScreenOverlay::Body, LUN=lun
Compile_Opt idl2
Catch, theError
IF theError NE 0 THEN BEGIN
Catch, /CANCEL
void = cgErrorMsg()
RETURN
ENDIF
; We require a logical unit number.
IF N_Elements(lun) EQ 0 THEN Message, 'A logical unit number (LUN) is required in this method.'
; Write the overlay elements.
PrintF, lun, ' <overlayXY ' + $
'x="' + String(self.overlay_xy[0], Format='(F0.6)') + '" ' + $
'y="' + String(self.overlay_xy[1], Format='(F0.6)') + '" ' + $
'xunits="' + self.overlay_unit_x + '" ' + $
'yunits="' + self.overlay_unit_y + '" />'
PrintF, lun, ' <screenXY ' + $
'x="' + String(self.screen_xy[0], Format='(F0.6)') + '" ' + $
'y="' + String(self.screen_xy[1], Format='(F0.6)') + '" ' + $
'xunits="' + self.screen_unit_x + '" ' + $
'yunits="' + self.screen_unit_y + '" />'
PrintF, lun, ' <size ' + $
'x="' + String(self.size_xy[0], Format='(F0.6)') + '" ' + $
'y="' + String(self.size_xy[1], Format='(F0.6)') + '" ' + $
'xunits="' + self.size_unit_x + '" ' + $
'yunits="' + self.size_unit_y + '" />'
self -> XMLTag, 'rotation', self.rotation, LUN=lun, SPACE=6
END
;+
; This method closes the <ScreenOverlay> tag in the KML file.
;
; :Keywords:
; lun: in, required, type=integer
; The logical unit number of the open KML file to write to.
;-
PRO cgKML_ScreenOverlay::Tail, LUN=lun
Compile_Opt idl2
Catch, theError
IF theError NE 0 THEN BEGIN
Catch, /CANCEL
void = cgErrorMsg()
RETURN
ENDIF
; We require a logical unit number.
IF N_Elements(lun) EQ 0 THEN Message, 'A logical unit number (LUN) is required in this method.'
; Write the overlay elements.
PrintF, lun, ' </ScreenOverlay>'
END
;+
; This BUILD method builds the ScreenOverlay section in the KML file.
;
; :Keywords:
; lun: in, required, type=integer
; The logical unit number of the open KML file to write to.
;-
PRO cgKML_ScreenOverlay::Build, LUN=lun
Compile_Opt idl2
Catch, theError
IF theError NE 0 THEN BEGIN
Catch, /CANCEL
void = cgErrorMsg()
RETURN
ENDIF
self -> Head, LUN=lun
self -> cgKML_Overlay::Build, LUN=lun
self -> Body, LUN=lun
self -> Tail, LUN=lun
END
;+
; The purpose of this method is to return object properties.
;
; :Keywords:
; overlay_xy: out, required, type=dblarr
; This keyword specifies a point [x,y] in the image overlay that is mapped to the
; screen coordinate `Screen_XY`. The location of the point is specified by the values
; in `Overlay_Units_X` and 'Overlay_Units_Y`.
; overlay_unit_x: out, optional, type=string, default='fraction'
; Three values are possible: (1) "fraction" indicates that the X value is a fraction of the image;
; (2) "pixels" indicates the the X value is in pixels; and (3) "insetPixels" indicates the X
; value is an indent from the right edge of the image.
; overlay_unit_y: out, optional, type=string, default='fraction'
; Three values are possible: (1) "fraction" indicates that the Y value is a fraction of the image;
; (2) "pixels" indicates the the Y value is in pixels; and (3) "insetPixels" indicates the Y
; value is an indent from the top edge of the image.
; rotation: out, optional, type=double, default=0.0
; This keyword indicates the angle of rotation of the screen overlay in degrees counterclockwise
; from North. A value from -180 to 180.
; screen_xy: out, optional, type=dblarr
; This keyword specifies a point [x,y] relative to the screen origin that the overlay image
; is mapped to. The location of the point is specified by the values in `XUnits` and 'YUnits`.
; screen_unit_x: out, optional, type=string, default='fraction'
; Three values are possible: (1) "fraction" indicates that the X value is a fraction of the image;
; (2) "pixels" indicates the the X value is in pixels; and (3) "insetPixels" indicates the X
; value is an indent from the right edge of the image.
; screen_unit_y: out, optional, type=string, default='fraction'
; Three values are possible: (1) "fraction" indicates that the Y value is a fraction of the image;
; (2) "pixels" indicates the the Y value is in pixels; and (3) "insetPixels" indicates the Y
; value is an indent from the top edge of the image.
; size_xy: out, required, type=dblarr
; This keyword specifies the size of the image for the screen overlay as follows. A -1
; indicates to use the native dimensions of the image. A 0 indicates that the aspect ratio
; of the image should be preserved. Any other value sets the output dimension of the image,
; according to the "unit" values.
; size_unit_x: out, optional, type=string, default='fraction'
; Three values are possible: (1) "fraction" indicates that the X value is a fraction of the image;
; (2) "pixels" indicates the the X value is in pixels; and (3) "insetPixels" indicates the X
; value is an indent from the right edge of the image.
; size_unit_y: out, optional, type=string, default='fraction'
; Three values are possible: (1) "fraction" indicates that the Y value is a fraction of the image;
; (2) "pixels" indicates the the Y value is in pixels; and (3) "insetPixels" indicates the Y
; value is an indent from the top edge of the image.
; _ref_extra: out, optional
; Any keywords for the superclass objects are allowed.
;-
PRO cgKML_ScreenOverlay::GetProperty, $
OVERLAY_XY=overlay_xy, $
OVERLAY_UNIT_X=overlay_unit_x, $
OVERLAY_UNIT_Y=overlay_unit_y, $
SCREEN_XY=screen_xy, $
SCREEN_UNIT_X=screen_unit_x, $
SCREEN_UNIT_Y=screen_unit_y, $
SIZE_XY=size_xy, $
SIZE_UNIT_X=size_unit_x, $
SIZE_UNIT_Y=size_unit_y, $
ROTATION=rotation, $
_REF_EXTRA=extra
IF Arg_Present(overlay_xy) THEN overlay_xy = self.overlay_xy
IF Arg_Present(overlay_unit_x) THEN overlay_unit_x = self.overlay_unit_x
IF Arg_Present(overlay_unit_y) THEN overlay_unit_y = self.overlay_unit_y
IF Arg_Present(screen_xy) THEN screen_xy = self.screen_xy
IF Arg_Present(screen_unit_x) THEN screen_unit_x = self.screen_unit_x
IF Arg_Present(screen_unit_y) THEN screen_unit_y = self.screen_unit_y
IF Arg_Present(size_xy) THEN size_xy = self.size_xy
IF Arg_Present(size_unit_x) THEN size_unit_x = self.size_unit_x
IF Arg_Present(size_unit_y) THEN size_unit_y = self.size_unit_y
IF Arg_Present(rotation) THEN rotation = self.rotation
; Superclass keywords.
IF N_Elements(extra) NE 0 THEN self -> cgKML_Overlay::GetProperty, _Extra=extra
END
;+
; The purpose of this method is to set object properties.
;
; :Keywords:
; overlay_xy: in, required, type=dblarr
; This keyword specifies a point [x,y] in the image overlay that is mapped to the
; screen coordinate `Screen_XY`. The location of the point is specified by the values
; in `Overlay_Units_X` and 'Overlay_Units_Y`.
; overlay_unit_x: in, optional, type=string, default='fraction'
; Three values are possible: (1) "fraction" indicates that the X value is a fraction of the image;
; (2) "pixels" indicates the the X value is in pixels; and (3) "insetPixels" indicates the X
; value is an indent from the right edge of the image.
; overlay_unit_y: in, optional, type=string, default='fraction'
; Three values are possible: (1) "fraction" indicates that the Y value is a fraction of the image;
; (2) "pixels" indicates the the Y value is in pixels; and (3) "insetPixels" indicates the Y
; value is an indent from the top edge of the image.
; rotation: in, optional, type=double, default=0.0
; This keyword indicates the angle of rotation of the screen overlay in degrees counterclockwise
; from North. A value from -180 to 180.
; screen_xy: in, optional, type=dblarr
; This keyword specifies a point [x,y] relative to the screen origin that the overlay image
; is mapped to. The location of the point is specified by the values in `XUnits` and 'YUnits`.
; screen_unit_x: in, optional, type=string, default='fraction'
; Three values are possible: (1) "fraction" indicates that the X value is a fraction of the image;
; (2) "pixels" indicates the the X value is in pixels; and (3) "insetPixels" indicates the X
; value is an indent from the right edge of the image.
; screen_unit_y: in, optional, type=string, default='fraction'
; Three values are possible: (1) "fraction" indicates that the Y value is a fraction of the image;
; (2) "pixels" indicates the the Y value is in pixels; and (3) "insetPixels" indicates the Y
; value is an indent from the top edge of the image.
; size_xy: in, required, type=dblarr
; This keyword specifies the size of the image for the screen overlay as follows. A -1
; indicates to use the native dimensions of the image. A 0 indicates that the aspect ratio
; of the image should be preserved. Any other value sets the output dimension of the image,
; according to the "unit" values.
; size_unit_x: in, optional, type=string, default='fraction'
; Three values are possible: (1) "fraction" indicates that the X value is a fraction of the image;
; (2) "pixels" indicates the the X value is in pixels; and (3) "insetPixels" indicates the X
; value is an indent from the right edge of the image.
; size_unit_y: in, optional, type=string, default='fraction'
; Three values are possible: (1) "fraction" indicates that the Y value is a fraction of the image;
; (2) "pixels" indicates the the Y value is in pixels; and (3) "insetPixels" indicates the Y
; value is an indent from the top edge of the image.
; _ref_extra: out, optional
; Any keywords for the superclass objects are allowed.
;-
PRO cgKML_ScreenOverlay::SetProperty, $
OVERLAY_XY=overlay_xy, $
OVERLAY_UNIT_X=overlay_unit_x, $
OVERLAY_UNIT_Y=overlay_unit_y, $
SCREEN_XY=screen_xy, $
SCREEN_UNIT_X=screen_unit_x, $
SCREEN_UNIT_Y=screen_unit_y, $
SIZE_XY=size_xy, $
SIZE_UNIT_X=size_unit_x, $
SIZE_UNIT_Y=size_unit_y, $
ROTATION=rotation, $
_REF_EXTRA=extra
Compile_Opt idl2
Catch, theError
IF theError NE 0 THEN BEGIN
Catch, /CANCEL
void = cgErrorMsg()
RETURN
ENDIF
IF N_Elements(overlay_xy) NE 0 THEN self.overlay_xy = overlay_xy
IF N_Elements(overlay_unit_x) NE 0 THEN self.overlay_unit_x = overlay_unit_x
IF N_Elements(overlay_unit_y) NE 0 THEN self.overlay_unit_y = overlay_unit_y
IF N_Elements(screen_xy) NE 0 THEN self.screen_xy = screen_xy
IF N_Elements(screen_unit_x) NE 0 THEN self.screen_unit_x = screen_unit_x
IF N_Elements(screen_unit_y) NE 0 THEN self.screen_unit_y = screen_unit_y
IF N_Elements(size_xy) NE 0 THEN self.size_xy = size_xy
IF N_Elements(size_unit_x) NE 0 THEN self.size_unit_x = size_unit_x
IF N_Elements(size_unit_y) NE 0 THEN self.size_unit_y = size_unit_y
IF N_Elements(rotation) NE 0 THEN self.rotation = rotation
; Superclass keywords.
IF N_Elements(extra) NE 0 THEN self -> cgKML_Overlay::SetProperty, _Extra=extra
END
;+
; The purpose of this method is to destroy anything we created that may leak
; memory or need to be released from use.
;-
PRO cgKML_ScreenOverlay::CLEANUP
; Call the superclass object's CLEANUP method
self -> cgKML_Overlay::Cleanup
END
;+
; The cgKML_ScreenOverlay class definition module. It is a container object and
; represents part of the KML file hierarchy.
;
; :Params:
; class: out, optional, type=structure
; The class definition returned as a structure variable. Occassionally useful.
;-
PRO cgKML_ScreenOverlay__Define, class
class = { cgKML_ScreenOverlay, $
INHERITS cgKML_Overlay, $ ; An extended cgOverlay object.
overlay_xy:DblArr(2), $
overlay_unit_x: "", $
overlay_unit_y: "", $
screen_xy:DblArr(2), $
screen_unit_x: "", $
screen_unit_y: "", $
size_xy: DblArr(2), $
size_unit_x: "", $
size_unit_y: "", $
rotation: 0.0d $
}
END