Messages from Usenet group comp.lang.idl-pvwave, compiled by Paulo Penteado
On Thu, 31 Aug 2006, greg michael wrote: > > I'm trying to make a plot with an exact print-size - 2 cm per tick mark > - using the PS device. > > Setting up the plot window works ok: > > set_plot,'PS' > > xrange=[-3,1] > yrange=[-4,2] > xticks=xrange[1]-xrange[0] > yticks=yrange[1]-yrange[0] > > > device,/encapsulated,filename="test.eps",/helvetica,xsize=xticks*2.+3.,ysize=yticks*2.+3. > > Then I hoped to be able to specify the plot region in centimetres using > 'position': > > > plot,[0],[0],/nodata,xrange=10.^xrange,/xlog,yrange=10.^yran ge,/ylog,/isotropic,$ > position=[2.,2.,2.+xticks*2.,2.+yticks*2.],/device,$ > xticks=xticks,yticks=yticks > > device,/close_file > > Seems the device coordinates are not cm, since all I get is a spot in > the bottom left corner. By trial and error, I find that if I multiply > the position array by 1000, I get more or less something which fills > the window. But I don't know where this 1000 figure comes from: does > anyone know what it means? And how I can calculate the exact value? > > many thanks, > Greg > > IDL> set_plot, 'ps' IDL> help, !d, /str ** Structure !DEVICE, 17 tags, length=84, data length=84: NAME STRING 'PS' X_SIZE LONG 17780 Y_SIZE LONG 12700 X_VSIZE LONG 17780 Y_VSIZE LONG 12700 X_CH_SIZE LONG 222 Y_CH_SIZE LONG 352 X_PX_CM FLOAT 1000.00 Y_PX_CM FLOAT 1000.00 N_COLORS LONG 256 TABLE_SIZE LONG 256 FILL_DIST LONG 1 WINDOW LONG -1 UNIT LONG 0 FLAGS LONG 266807 ORIGIN LONG Array[2] ZOOM LONG Array[2] regards, lajos
In article <1157045037.993836.3160@e3g2000cwe.googlegroups.com>, greg michael <greg.michael@gmail.com> wrote: > > I'm trying to make a plot with an exact print-size - 2 cm per tick mark > - using the PS device. > > Setting up the plot window works ok: > > set_plot,'PS' > > xrange=[-3,1] > yrange=[-4,2] > xticks=xrange[1]-xrange[0] > yticks=yrange[1]-yrange[0] > > > device,/encapsulated,filename="test.eps",/helvetica,xsize=xticks*2.+3.,ysize=yticks*2.+3. > > Then I hoped to be able to specify the plot region in centimetres using > 'position': > > > plot,[0],[0],/nodata,xrange=10.^xrange,/xlog,yrange=10.^yran ge,/ylog,/isotropic,$ > position=[2.,2.,2.+xticks*2.,2.+yticks*2.],/device,$ > xticks=xticks,yticks=yticks > > device,/close_file > > Seems the device coordinates are not cm, since all I get is a spot in > the bottom left corner. By trial and error, I find that if I multiply > the position array by 1000, I get more or less something which fills > the window. But I don't know where this 1000 figure comes from: does > anyone know what it means? And how I can calculate the exact value? > > many thanks, > Greg IDL> set_plot,'PS' IDL> print, !D.X_PX_CM 1000.00 IDL> print, !D.Y_PX_CM 1000.00 IDL help says these variables are the approximate number of pixels per centimeter in the X and Y directions. --Mike
Oh - that's nice. Looks like 1000's just right. Now that doesn't happen often! many thanks, Greg