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C C
C Copyright (C) 1995 C
C University Corporation for Atmospheric Research C
C All Rights Reserved C
C C
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
C
C File: basic08f.f
C
C Author: David Brown (translated to Fortran by David Younghans)
C National Center for Atmospheric Research
C Boulder, Colorado 80303
C
C
C Date: Wed August 23, 1995
C
C Description: This Fortran program demonstrates how to draw
C a plot object including any annotations
C outside its viewport within a predefined
C bounded area of NDC space. The subroutine
C drbdplt is intended to be useful in any
C context where it is desired to keep an entire plot
C within predetermined boundaries.
C
C
program basic08f
implicit none
external NhlFAppClass
external NhlFNcgmWorkstationClass
external NhlFCairoWindowWorkstationClass
external NhlFPSWorkstationClass
external NhlFPDFWorkstationClass
external NhlFCairoPSPDFWorkstationClass
external NhlFCairoImageWorkstationClass
external NhlFLogLinPlotClass
external NhlFContourPlotClass
integer appid,rlist,grlist
integer wid,gid,ll_id,cn_id
character*7 wks_type
integer ierr
real x(5),y(5)
C
C Define the workstation type
C
wks_type = "x11"
C
C Initialize the high level utility library and create application.
C
call NhlFInitialize
call NhlFRLCreate(rlist,'SETRL')
call NhlFRLCreate(grlist,'GETRL')
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'appUsrDir','./',ierr)
call NhlFRLSetString(rlist,'appDefaultParent','True',ierr)
call NhlFCreate(appid,'basic08',NhlFAppClass,0,rlist,ierr)
if (wks_type.eq."ncgm".or.wks_type.eq."NCGM") then
C
C Create a metafile workstation with the default colormap.
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'wkMetaName',
& './basic08f.ncgm',ierr)
call NhlFCreate(wid,'simple',
& NhlfNcgmWorkstationClass,0,rlist,ierr)
endif
if (wks_type.eq."x11".or.wks_type.eq."X11") then
C
C Create an X workstation.
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'wkPause','True',ierr)
call NhlFCreate(wid,'simple',
+ NhlFCairoWindowWorkstationClass,
& 0,rlist,ierr)
endif
if (wks_type.eq."oldps".or.wks_type.eq."oldPS") then
C
C Create an older-style PS workstation.
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'wkPSFileName',
& './basic08f.ps',ierr)
call NhlFCreate(wid,'simple',NhlFPSWorkstationClass,
& 0,rlist,ierr)
endif
if (wks_type.eq."oldpdf".or.wks_type.eq."oldPDF") then
C
C Create an older-style PDF workstation.
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'wkPDFFileName',
& './basic08f.pdf',ierr)
call NhlFCreate(wid,'simple_pdf',NhlFPDFWorkstationClass,
& 0,rlist,ierr)
endif
if (wks_type.eq."pdf".or.wks_type.eq."PDF".or.
& wks_type.eq."ps".or.wks_type.eq."PS") then
C
C Create a cairo PS/PDF workstation.
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'wkFileName','./basic08c',ierr)
call NhlFRLSetString(rlist,'wkFormat',wks_type,ierr)
call NhlFCreate(wid,'simple_cairo',
+ NhlFCairoPSPDFWorkstationClass,0,rlist,ierr)
end if
if (wks_type.eq."png".or.wks_type.eq."PNG") then
C
C Create a cairo PNG workstation.
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'wkFileName','./basic08c',ierr)
call NhlFRLSetString(rlist,'wkFormat',wks_type,ierr)
call NhlFCreate(wid,'simple_cairo',
+ NhlFcairoImageWorkstationClass,0,rlist,ierr)
end if
C
C Create a LogLinPlot with a viewport that fills the viewspace. This will
C be used for drawing immediate mode polylines indicating the intended
C boundary of each plot object.
C
call NhlFRLClear(rlist)
call NhlFRLSetFloat(rlist,'vpXF',0.0,ierr)
call NhlFRLSetFloat(rlist,'vpYF',1.0,ierr)
call NhlFRLSetFloat(rlist,'vpHeightF',1.0,ierr)
call NhlFRLSetFloat(rlist,'vpWidthF',1.0,ierr)
call NhlFCreate(ll_id,'loglin',NhlFLogLinPlotClass,
& wid,rlist,ierr)
C
C Set GraphicStyle resources to modify the immediate mode line
C attributes.
C
call NhlFRLClear(grlist)
call NhlFRLGetInteger(grlist,'wkDefGraphicStyleId',gid,ierr)
call NhlFGetValues(wid,grlist,ierr)
call NhlFRLClear(rlist)
call NhlFRLSetInteger(rlist,'gsLineColor',2,ierr)
call NhlFRLSetInteger(rlist,'gsLineDashPattern',1,ierr)
call NhlFSetValues(gid,rlist,ierr)
C
C Create an empty ContourPlot with a Title, a LableBar, and a Legend.
C Note that the viewport is square and covers the whole NDC space,
C meaning that if the plot were drawn as created, all annotations exterior
C to the viewport would be outside the viewspace and therefore clipped.
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'pmLabelBarDisplayMode',
& 'always',ierr)
call NhlFRLSetString(rlist,'pmLegendDisplayMode',
& 'always',ierr)
call NhlFRLSetString(rlist,'tiMainString',
& 'bounded contour plot',ierr)
call NhlFRLSetFloat(rlist,'vpXF',0.0,ierr)
call NhlFRLSetFloat(rlist,'vpYF',1.0,ierr)
call NhlFRLSetFloat(rlist,'vpHeightF',1.0,ierr)
call NhlFRLSetFloat(rlist,'vpWidthF',1.0,ierr)
call NhlFCreate(cn_id,'contour',NhlFContourPlotClass,
& wid,rlist,ierr)
C
C The first frame illustrates drawing the plot with a 5% margin around
C the viewable area. Draw an immediate mode line indicating the boundary
C that defines the margin.
C
x(1) = 0.05
x(2) = 0.95
x(3) = 0.95
x(4) = 0.05
x(5) = 0.05
y(1) = 0.05
y(2) = 0.05
y(3) = 0.95
y(4) = 0.95
y(5) = 0.05
call NhlFNDCPolyline(ll_id,gid,x,y,5,ierr)
C
C Draw the plot with the desired boundary parameters.
C
call drbdplt(cn_id,.true.,0.05,0.95,0.05,0.95,rlist)
call NhlFFrame(wid,ierr)
C
C The second frame illustrates use of the drbdplt subroutine
C to place several plots with varying aspect ratios in a single frame.
C
x(1) = 0.025
x(2) = 0.475
x(3) = 0.475
x(4) = 0.025
x(5) = 0.025
y(1) = 0.525
y(2) = 0.525
y(3) = 0.975
y(4) = 0.975
y(5) = 0.525
call NhlFNDCPolyline(ll_id,gid,x,y,5,ierr)
C
C Set the ContourPlot viewport so that the width is twice the height.
C (The absolute numbers are not important here, only the ratio matters.)
C
call NhlFRLClear(rlist)
call NhlFRLSetFloat(rlist,'vpWidthF',0.6,ierr)
call NhlFRLSetFloat(rlist,'vpHeightF',0.3,ierr)
call NhlFRLSetString(rlist,'tiMainString',
& 'width is limiting dimension',ierr)
call NhlFsetValues(cn_id,rlist,ierr)
C
C Draw the plot with the desired boundary parameters.
C
call drbdplt(cn_id,.true., 0.025, 0.475, 0.525, 0.975,
& rlist)
C
C Draw an immediate mode line indicating the desired boundary of the
C second plot.
C
x(1) = 0.525
x(2) = 0.975
x(3) = 0.975
x(4) = 0.525
x(5) = 0.525
y(1) = 0.525
y(2) = 0.525
y(3) = 0.975
y(4) = 0.975
y(5) = 0.525
call NhlFNDCPolyline(ll_id,gid,x,y,5,ierr)
C
C Set the ContourPlot viewport so that the height is twice the width.
C
call NhlFRLClear(rlist)
call NhlFRLSetFloat(rlist,'vpWidthF',0.3,ierr)
call NhlFRLSetFloat(rlist,'vpHeightF',0.6,ierr)
call NhlFRLSetString(rlist,'tiMainString',
& 'height is limiting dimension',ierr)
call NhlFSetValues(cn_id,rlist,ierr)
C
C Draw the plot with the desired boundary parameters.
C
call drbdplt(cn_id,.true., 0.525, 0.975, 0.525, 0.975,
& rlist)
C
C Draw an immediate mode line indicating the desired boundary of the
C third plot.
C
x(1) = 0.125
x(2) = 0.875
x(3) = 0.875
x(4) = 0.125
x(5) = 0.125
y(1) = 0.1
y(2) = 0.1
y(3) = 0.4
y(4) = 0.4
y(5) = 0.1
call NhlFNDCPolyline(ll_id,gid,x,y,5,ierr)
C
C For this plot the aspect ratio is distorted in order to fill as much as
C possible of the desired area. Note that the space is not completely filled.
C This is because a number of factors affecting the final aspect ratio,
C such as the text size used for titles, are determined based on only
C one of the viewport's dimensions.
C
call NhlFRLClear(rlist)
call NhlFRLSetFloat(rlist,'vpHeightF',1.0,ierr)
call NhlFRLSetFloat(rlist,'vpWidthF',1.0,ierr)
call NhlFRLSetString(rlist,'tiMainString',
& 'distort aspect ratio to fill area',ierr)
call NhlFSetValues(cn_id,rlist,ierr)
C
C Draw the plot with the desired boundary parameters.
C
call drbdplt(cn_id,.false., 0.125, 0.875, 0.1, 0.4,
& rlist)
call NhlFFrame(wid,ierr)
C
C Clean up
C
call NhlFDestroy(wid,ierr)
call NhlFClose
stop
end
C
C
C
subroutine drbdplt(id,keep_aspect,left,right,
& bottom,top,rlist)
C
C This subroutine takes the plot object with identifier "id" and
C draws it within the NDC boundaries represented by left, right,
C top, and bottom. If keep_aspect is .true, the aspect ratio of the plot
C is preserved: the plot fills the extent of the limiting dimension and
C is centered within the extent of the other dimension. If keep_aspect is
C .false., the aspect ratio is distorted in order to fill as much of the
C space as possible, given certain limitations in the ability of some
C HLU object to distort themselves to any arbitrary aspect ratio.
C
implicit none
integer id
logical keep_aspect
real left,right,bottom,top
integer grlist,rlist,ierr
real x_save,y_save,width_save,height_save,
& bb_top,bb_bottom,bb_left,bb_right,bb_height,bb_width,
& frame_height,frame_width,
& factor,
& x_off,y_off,x,y,width,height
call NhlFRLCreate(grlist,'GETRL')
call NhlFRLClear(grlist)
call NhlFRLGetFloat(grlist,'vpXF',x_save,ierr)
call NhlFRLGetFloat(grlist,'vpYF',y_save,ierr)
call NhlFRLGetFloat(grlist,'vpWidthF',width_save,ierr)
call NhlFRLGetFloat(grlist,'vpHeightF',height_save,ierr)
call NhlFGetValues(id,grlist,ierr)
call NhlFGetBB(id,bb_top,bb_bottom,bb_left,bb_right,ierr)
bb_height = bb_top - bb_bottom
bb_width = bb_right - bb_left
frame_height = top - bottom
frame_width = right - left
x = x_save
y = y_save
height = height_save
width = width_save
if (.not. keep_aspect) then
factor = frame_width / bb_width
width = width * factor
x_off = (x - bb_left) * factor
x = left + x_off
factor = frame_height / bb_height
height = height * factor
y_off = (y - bb_top) * factor
y = top + y_off
call NhlFRLClear(rlist)
call NhlFRLSetFloat(rlist,'vpXF',x,ierr)
call NhlFRLSetFloat(rlist,'vpYF',y,ierr)
call NhlFRLSetFloat(rlist,'vpWidthF',width,ierr)
call NhlFRLSetFloat(rlist,'vpHeightF',height,ierr)
call NhlFSetValues(id,rlist,ierr)
call NhlFRLClear(grlist)
call NhlFRLGetFloat(grlist,'vpXF',x,ierr)
call NhlFRLGetFloat(grlist,'vpYF',y,ierr)
call NhlFRLGetFloat(grlist,'vpWidthF',width,ierr)
call NhlFRLGetFloat(grlist,'vpHeightF',height,ierr)
call NhlFGetValues(id,grlist,ierr)
call NhlFGetBB(id,bb_top,bb_bottom,bb_left,bb_right,ierr)
bb_height = bb_top - bb_bottom
bb_width = bb_right - bb_left
endif
if (bb_height / bb_width .lt. frame_height / frame_width) then
C
C Width is the limiting dimension.
C
factor = frame_width / bb_width
width = width * factor
height = height * factor
x_off = (x - bb_left) * factor
y_off = (y - bb_top) * factor
x = left + x_off
bb_height = bb_height * factor
y = top + y_off - 0.5 * (frame_height - bb_height)
else
C
C Height is the limiting dimension.
C
factor = frame_height / bb_height
height = height * factor
width = width * factor
x_off = (x - bb_left) * factor
y_off = (y - bb_top) * factor
bb_width = bb_width * factor
x = left + x_off + 0.5 * (frame_width - bb_width)
y = top + y_off
endif
call NhlFRLClear(rlist)
call NhlFRLSetFloat(rlist,'vpXF',x,ierr)
call NhlFRLSetFloat(rlist,'vpYF',y,ierr)
call NhlFRLSetFloat(rlist,'vpWidthF',width,ierr)
call NhlFRLSetFloat(rlist,'vpHeightF',height,ierr)
call NhlFSetValues(id,rlist,ierr)
call NhlFDraw(id,ierr)
call NhlFRLClear(rlist)
call NhlFRLSetFloat(rlist,'vpXF',x_save,ierr)
call NhlFRLSetFloat(rlist,'vpYF',y_save,ierr)
call NhlFRLSetFloat(rlist,'vpWidthF',width_save,ierr)
call NhlFRLSetFloat(rlist,'vpHeightF',height_save,ierr)
call NhlFSetValues(id,rlist,ierr)
return
end
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