| Re: Polar plots [message #6814 is a reply to message #6524] |
Wed, 28 August 1996 00:00  |
rsimpson
Messages: 5
Registered: August 1996
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Junior Member |
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Don't know if this is exactly what you want, but it might help.
; Program Overview: polar_plot
; Polar_axis defines and displays a polar diagram representation, and
; then plots the data.
;
; J.Stupples , March 1994
;
; parameters: polardat - The polar data to be displayed.
;
; keywords: Charsize - The character size of the numeric data.
; The default is 1.
; Color - The color for the entire plot. The default
; is the foreground color.
; Data_Range - Specifies the polar angle through which
; the data is to be viewed. The default
; is 0 - 360.
; Degrees - Labels the polar axis in degrees.(switch)
; Font - Specifies software or hardware font.
; Gridstyle - The gristyle pattern the axis is to be
; made up from.
; Linestyle - The linestyle in which the data is to be
; displayed.
; Nodata - Will draw an empty axis (switch)
; Radians - Labels the polar axis in radians.(switch)
; Subtitle - Prints a subtitle under th plot.
; Tickformat - Allows axis variables to be displayed
; using fortran type formatting.
; Title - Prints a title on the plot diagram.
; Xgridstyle - The gridstyle for the x-axis.
; Xminor - The number of minor tickmarks on the
; x-axis. The default is 36.
; Xstyle - Specifies style of x-axis.
; Xticks - The number of major tickmarks on the
; x-axis.The default is 8.
; Ygridstyle - The gridsyle for the y-axis.
; Ynozero - Prohibits the minimum value of the y-axis
; from being zero.
; Yrange - Specifies the range of the y-axis.
; Ystyle - Specifies the style of the y-axis.
; Yticks - The number of major tick marks on the
; y-axis.
;
; ************************************************************ *******
PRO Draw_labels,degrees,radians
IF degrees or radians THEN BEGIN
label = ['90','180','270']
position = [64,0,-3,-66,-70,0]
IF radians THEN BEGIN
label = ['!4p!3/2','!4p','!33!4p!3/2']
position = [64,0,-1,-66,-73,0]
ENDIF
FOR count = 0 , 4 ,2 DO BEGIN
xyouts, position(count), position(count+1), $
label(((count +2)/2)-1)
ENDFOR
ENDIF
END
;*********************************************************** *********
FUNCTION Find_num_of_ticks,polardat,yrange,yticks,ynozero,ystyle,ytic kv
tick_6 = 0
num_ticks = yticks
IF yticks EQ 0 THEN BEGIN
PLOT, polardat>(max (polardat) - 30.0),xstyle = 4,$
ystyle = (ystyle or 4), /nodata, yrange = yrange,$
yticks = yticks, ytickv = ytickv, ynozero = ynozero
range = !Y.Crange(1) - !Y.Crange(0)
IF (range lt 100) OR (range ge 1000) THEN BEGIN
func = '/'
IF range lt 100 THEN func='*'
REPEAT BEGIN
command = 'range = range' + func + '10'
a_dummy = execute (command)
ENDREP UNTIL (range ge 100) and (range lt 1000)
ENDIF
FOR i = 8, 3, -1 DO BEGIN
IF (range mod i EQ 0) and ((range / i) mod 10 EQ 0) THEN BEGIN
num_ticks = i
IF num_ticks EQ 6 THEN tick_6 = 1
ENDIF
ENDFOR
ENDIF
IF tick_6 AND num_ticks EQ 3 THEN num_ticks = 6
RETURN, num_ticks
END
;*********************************************************** **********
FUNCTION draw_circles, inc, num_of_circles, angle,color,$
subtitle, title, y_gridstyle, xstyle, ygridstyle, ystyle
IF ygridstyle NE 0 THEN y_gridstyle = ygridstyle
num_angles = 361
circle = fltarr (num_angles, /nozero)
circle (*) = inc * num_of_circles
blank_line = fltarr(2,num_of_circles)
blank_line (0,*) = 0.0
num_of_blanks = num_of_circles / 2
size_of_blank = 8
angle_of_blank = (360 * size_of_blank)/(2 * !Dpi * circle(0))
blank_circle = fltarr(361 - angle_of_blank - 1.0)
blank_circle(*) = circle(0)
blank_angle = ((findgen(360 - angle_of_blank) / 360) * 2 * !Dpi)+$
(!Dpi / 2)+(!Dpi / (360 / angle_of_blank))
xsize = (float (!D.X_Vsize))
ysize = (float (!D.Y_Vsize))
smalldim = xsize < ysize
xdim = 0.45 * smalldim / xsize
ydim = 0.45 * smalldim / ysize
PLOT, (blank_circle + 7), blank_angle, /polar, xstyle = 5, ystyle = 5, $
position = [0.5 - xdim, 0.5 - ydim, 0.5 + xdim, 0.5 + ydim],$
color = color, subtitle = subtitle, title = title, /nodata
count2 = -1
FOR count = (circle(0)-(inc * num_of_circles)),$
((circle(0) - inc) + 0.0001), inc DO BEGIN
count2 = count2 + 1
IF (count2 mod 2 EQ 0) AND (num_of_blanks GT 0) THEN BEGIN
blank_line (1,count2) = (circle(0) - count -3)
angle_of_blank = fix((360 * size_of_blank) /$
(2 * !Dpi * (circle(0) - count)))
blank_circle = fltarr(num_angles - angle_of_blank - 1)
blank_circle(*) = circle(0)
blank_angle =((findgen(360 - angle_of_blank) / 360) * 2 * !Dpi) +$
(!Dpi / 2) + (!Dpi / (360 / angle_of_blank))
OPLOT , blank_circle - count, blank_angle, /polar, color = color,$
linestyle = y_gridstyle, nodata = (ystyle and 4)
num_of_blanks = num_of_blanks - 1
ENDIF else BEGIN
blank_line (1,count2) = (circle(0) - count - inc + 3)
OPLOT , circle - count, angle, /polar, color = color,$
linestyle = y_gridstyle, nodata = (ystyle and 4)
ENDELSE
ENDFOR
count2 = count2 + 1
blank_line(1,(((count2 / 2) * 2) - 1)) = 0
IF xstyle ne 4 THEN BEGIN
FOR count = 0 , (n_elements(blank_line) / 2) - 2 , 2 DO BEGIN
PLOTS,blank_line(*,count:count + 1),color = color,$
linestyle = y_gridstyle
ENDFOR
ENDIF
RETURN , circle
END
;*********************************************************** *********
PRO Draw_lines , num_of_lines, circle, inc, num_of_ticks, max_val,$
min_val, num_of_circles, color, gridstyle,$
xgridstyle, xstyle
IF xgridstyle GT 0 THEN gridstyle = xgridstyle
line_angles = findgen (num_of_lines)
line_angles = line_angles * (360 / float(num_of_lines))
line_angles = (line_angles / 360) * 2 * !Dpi
lines = fltarr(2, num_of_lines * 2)
FOR count = 2, ((num_of_lines - 1) * 2), 2 DO BEGIN
line_length = 1.05
IF (line_angles(count / 2) + 0.1) mod (!Dpi / (num_of_ticks / 2))$
GT 0.15 THEN BEGIN
line_length = 1
ENDIF
IF (line_angles(count / 2) + 0.1) mod (!Dpi / 6) GT 0.15 THEN BEGIN
x_centre = (circle(0) - (inc * (num_of_circles - 1))) *$
sin(line_angles(count / 2))
y_centre = (circle(0) - (inc * (num_of_circles - 1))) *$
cos(line_angles(count / 2))
ENDIF else BEGIN
x_centre = 0.0
y_centre = 0.0
ENDELSE
lines(0,count) = x_centre
lines(1,count) = y_centre
lines(0,count+1) = (line_length * (num_of_circles * inc)) *$
sin(line_angles(count / 2))
lines(1,count+1) = (line_length * (num_of_circles * inc)) *$
cos(line_angles(count / 2))
IF xstyle ne 4 THEN BEGIN
PLOTS,lines(*,count:count+1), color = color, linestyle = gridstyle
ENDIF
ENDFOR
END
;*********************************************************** ***********
PRO Draw_values , num_of_circles, inc, y_vals, charsize, color, font,$
xstyle
factor = 1
if !D.Name EQ "PS" then factor = 30.5555
x_size = !D.X_size / factor
y_size = !D.Y_size / factor
x_char_size = !D.X_ch_size / factor
y_char_size = !D.Y_ch_size / factor
IF charsize EQ -10 THEN BEGIN
charsize = float(x_size < y_size) / 470
ENDIF
y_offset = (y_char_size * charsize) / (charsize / 0.11)
num_of_values = num_of_circles / 2
for count = 0, num_of_values - 1 do begin
x_offset = (strlen(y_vals(count)) * x_char_size /$
(charsize / 0.15)) * charsize
y_pos = (num_of_circles - (count * 2)) * inc
xyouts , - x_offset, y_pos - y_offset, y_vals(count),$
charsize = charsize
endfor
END
;*********************************************************** **********
FUNCTION extract_y_vals,y_vals, tickformat
dummy = y_vals
count1 = -1
FOR count = n_elements(y_vals) , 1, -2 DO BEGIN
count1 = count1 +1
dummy(count1) = y_vals(count - 1)
ENDFOR
polar_vals = dummy(0:count1 - 1)
polar_vals = string (polar_vals , format = tickformat)
RETURN , polar_vals
END
;*********************************************************** **********
PRO polar, polardat, charsize = charsize, color = color, font = font,$
gridstyle = gridstyle, linestyle = linestyle, $
nodata = nodata, subtitle = subtitle, title = title,$
xgridstyle = xgridstyle,xminor = xminor, xstyle = xstyle,$
xticks = xticks, ygridstyle = ygridstyle, ynozero = ynozero,$
yrange = yrange, ystyle = ystyle, yticks = yticks,$
ytickv = ytickv, degrees = degrees, radians = radians,$
data_range = data_range, tickformat = tickformat
IF (not keyword_set(charsize)) THEN charsize = -10
IF (not keyword_set(color)) THEN color = !P.Color
IF (not keyword_set(font)) THEN font = 0
IF (not keyword_set(gridstyle)) THEN gridstyle = 0
IF (not keyword_set(linestyle)) THEN linestyle = 0
IF (not keyword_set(nodata)) THEN nodata = 0
IF (not keyword_set(subtitle)) THEN subtitle = ''
IF (not keyword_set(title)) THEN title = ''
IF (not keyword_set(xgridstyle)) THEN xgridstyle = 0
IF (not keyword_set(xminor)) THEN xminor = 36
IF (not keyword_set(xstyle)) THEN xstyle = 0
IF (not keyword_set(xticks)) THEN xticks = 8
IF (not keyword_set(ygridstyle)) THEN ygridstyle = 0
IF (not keyword_set(ynozero)) THEN ynozero = 0
IF (not keyword_set(yrange)) THEN yrange = [0,0]
IF (not keyword_set(ystyle)) THEN ystyle = 0
IF (not keyword_set(yticks)) THEN yticks = 0
IF (not keyword_set(ytickv)) THEN ytickv = [0,0]
IF (not keyword_set(degrees)) THEN degrees = 0
IF (not keyword_set(radians)) THEN radians = 0
IF (not keyword_set(data_range)) THEN data_range = [0,360]
IF (not keyword_set(tickformat)) THEN tickformat = ''
PLOT, polardat>(max (polardat) - 30.0), ystyle = (ystyle or 4),$
xstyle = 4, yticks = yticks, yrange = yrange, ytickv = ytickv,$
/nodata, ynozero = ynozero
polardat1 = polardat - !Y.Crange(0)
min_val = !Y.Crange(0)
max_val = !Y.Crange(1)
start = data_range(0)
finish = data_range(1)
data_angle = (reverse(findgen(n_elements (polardat))) /$
n_elements (polardat) * (finish-start)) + 90 - finish
data_angle = (data_angle / 360) * 2 * !Dpi
angle = (findgen (360) / (361) * 2.0 * !Dpi) + (!Dpi / 2)
angle = reverse(angle)
num_y_ticks = Find_num_of_ticks (polardat, yrange, yticks, ynozero,$
ystyle,ytickv)
y_step = fix(((max_val - min_val) / (num_y_ticks)))
y_vals = strtrim (string (fix (findgen (num_Y_ticks + 1)) * y_step), 2)
y_vals = strtrim (fix ((y_vals + min_val)), 2)
polar_vals = Extract_y_vals(y_vals, tickformat)
num_of_circles = num_y_ticks
inc = (max_val - min_val) / num_of_circles
scale_factor = float(60 / (inc * num_of_circles))
inc = inc * scale_factor
xstyle = xstyle and 4
line_gridstyle = gridstyle
circle = Draw_circles(inc, num_of_circles, angle, color,subtitle,$
title, gridstyle, xstyle, ygridstyle, ystyle)
Draw_lines , xminor, circle, inc, xticks, max_val, min_val,$
num_of_circles, color, line_gridstyle, xgridstyle, xstyle
Draw_values , num_of_circles, inc, polar_vals, charsize, color, font,$
xstyle
Draw_labels , degrees, radians
OPLOT , (polardat1 * scale_factor) > 0.0, data_angle, /polar,$
color = color, linestyle = linestyle, nodata = nodata
END
--
Richard Simpson
Farnborough, Hants, Uk Fax: 01252 392118
rsimpson@ewrcsdra.demon.co.uk
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