TweetFollow Us on Twitter

Plotting
Volume Number:9
Issue Number:6
Column Tag:Jörg's Folder

Plotting Packages for Fortran

Inspecting TSI Graphics and SuperPlot

By Jörg Langowski, MacTech Magazine Regular Contributing Author

Note: Source code files accompanying article are located on MacTech CD-ROM or source code disks.

Sorry to say for you C++ and Forth lovers, my desk recently gets swamped with goodies from both main players in the Macintosh Fortran game. Absoft has just sent a big parcel with version 3.2 of MacFortran II. Now, the deadline is again approaching in giant leaps, and I have no time to review it for this column; but I promise you a detailed overview in the next one. Here I’ll only mention that Absoft Fortran’s Macintosh run time environment - one of the main shortcomings of previous versions - has finally been improved. Apple Events are supported, as is publish/subscribe, you can use multiple windows, change fonts, change menus, etc. Just from looking at the manual it seems that they offer as many possibilities as LS Fortran, if not more. First tests with the Linpack benchmark indicate that the speed it still about the same (on my old MacII), which means the usual 20-30% faster than LS Fortran (I guess the compiler that makes my MacII turn as fast as a Cray still has to be invented). So stay tuned for a review.

TSI Graphics

Unless you are content with interfacing your Fortran output to a spreadsheet (you saw in the last column how that goes), you might have struggled with writing your own code for graphing the results of a Fortran program. If you have done that, you know how much time you can waste reinventing the wheel. Because there are good plotting libraries around, and one of them is TSI Graphics (Techno-Sciences Inc., 10001 Derekwood Lane, Suite 204, Lanham, MD 20706; phone (301) 577-6000). Language Systems is promoting this package, which works with their Fortran and contains some very powerful tools.

TSI Graphics does several things that are quite tedious to implement if you do it on your own. First of all, it creates one or several - automatically updated - graphics windows. Each window can contain several plot regions in which to display your data. The beautiful thing is that plots created using the TSI plotting routines are automatically adjusted to fit into the active plot area, so you don’t have to worry about setting the length of an axis, the rectangle of a frame, etc. If you have written code that plots correctly in a certain region, the plot will still have the same aspect when you resize the plot area.

The types of plots that are possible are line, bar, pie, X-Y, contour, and 3D mesh surface plots. You can add error bars to plots, create cumulative plots from groups of data, of course use linear or logarithmic scales, set the ranges of the plot axes automatically, label the plot with text in the font, size and style you want, print the plot or save it to a file, and plot in any color (using your own color tables). In fact, you have most of the functions available that a good data graphing program will give you, including the possibility to offset slices of a pie chart to emphasize them. I found one important feature missing - you cannot draw dashed or dotted lines, or change the line thickness. For the rest of us who does not have color printers available, this would be a very important addition - the only way you can distinguish line plots on a black-and-white printer so far is by adding symbols to data points. Adding different line styles to version 2.0 is strongly suggested.

Let us now see how TSI graphics does its work. For the example program, I have chosen the contour plot and the 3D mesh plot, both things you wouldn’t wish you had to write your own code for. We create a 2-dimensional data array and display it both ways in one window, using two different plot areas. The function we plot is

z = 10.0 * exp (-r/5.) * sin(r/2.) *  cos(2.*atan2(x,y))

where r is the distance from the origin x=0, y=0. The output of the program (see listing) is shown in Figure 1.

Fig. 1: Output of the plot program

How is TSI Graphics used? The example shows that you first call a setup routine, InitGraphicsPackage(), set the size of the output window, and then, after creating the data, call the actual plotting routine DrawInNewWindow. This last routine takes one parameter, a pointer to a subroutine that does the drawing. All this happens in the main Fortran program; as you know if you are familiar with the LS Fortran environment, the main program is often used only for setup purposes. After the main program has exited, the run time environment lets you call subroutines to do the actual work by connecting them to menu items. TSI Graphics works closely connected to this LS Fortran run time environment and hooks itself into the main event loop (at least I think so, I haven’t analyzed the code), so that update events to the graphics window are intercepted and the drawing subroutine is called, even after the main program has exited.

This gives you the advantage that you can easily write very modular code. You define your graphics window(s) with the associated drawing routines and your menus with the routines that do the calculation in the main program, and then exit to the run time environment. Then you can initiate your calculations from the menus, change the data that is to be plotted, and have the graphics window automatically update itself (assuming you have written the plotting subroutine so that it takes into account the changed data correctly). Even if you resize the graphics window, all plot areas will be recalculated to fit into the new window.

Look at the example again: all drawing is done through the routine CreatePlot, which receives its parameters through a common block (you can’t pass subroutines with parameters as arguments to other subroutines in Fortran). The first part of the drawing routine creates the 3D mesh plot. Two plotting areas are defined in the window: the two calls to SetPercentPlotRegion define the left and right halves of the window as plotting areas 1 and 2. The coordinates of the areas are given in percent of the total window height and width. We then set the plotting area to 1 (the left half), and inset the plot by 10% from each side of the area (the call to SetPlotRatio). The rectangle to be displayed in the mesh plot goes from -10 to +10 in both x and y directions (the call to Set3DViewingRect), and we look at this rectangle from a certain point in space (the call to Set3DEyePosition). After these setup calls, we are ready to call MeshPlot, which gives us the complicated plot that you see in the left half of the figure, and label it with some text.

The contour plot is then created by the second half of the program. We set the new plotting area, define the x and y scaling (both from -15 to 15), and draw axes on all four sides of the plot. Then we call ContourPlot and are done! You see the result in the right half of the figure. Quite impressive, and I challenge you to write such a routine yourself, you’ll spend a lot of time on it.

SuperPlot

Another philosophy for displaying data is followed by a plotting package that is compatible with both Language Systems and Absoft Fortran: SuperPlot. It is available through SuperSoft, 498 E Robin Rd., Orem, UT 84057, (801) 225-4356. SuperPlot is at an intermediate position between choosing a separate graphing program like Excel for displaying the Fortran data, and an integrated plotting library like TSI Graphics. When you link the SuperPlot routines into your Fortran application, the program behaves as if you had a complete 2D plotting application embedded within your program. When you invoke SuperPlot it replaces the application’s menu bar with one of its own and, once the plot has been drawn, it allows you to edit, save or print the graph, change the axis scaling, line size and styles, add arrows or text, etc. You have to select “Quit to application” from SuperPlot’s menu bar to return control to the FORTRAN program. Multiple calls to SuperPlot can be made from a single program and up to 10 sets of data may be overlaid on the same graph.

In my opinion, SuperPlot is not so much for writing Fortran programs for general distribution (except if you write a general-purpose graphing program, in which case SuperPlot has already done most of the job), but for the research/engineering type user who has to display data from a program and wants to do so without having to save the data first, open a graphics program, read the data in, create the graph etc. If you write a program in which a graphics window is an integral part of the application and the graphics output needs to be updated without user intervention, you need TSI Graphics. Also, the contour and 3D mesh plot options are very powerful and not available in SuperPlot. On the other hand, for creating nicely-looking black and white graphs, SuperPlot is much superior (of course it can do color, too), allowing you to do dashed lines of varying thickness and easily change the plot style without having to recompile the Fortran program.

Next month - a review of Absoft Fortran (as promised), and more.

Example: Window with double plot area, containing a contour and a 3D mesh 
plot

      Program JLDemo
      External CreatePlot
      INTEGER maxContourX, maxContourY
      REAL XYZdata(31,31)
      integer contourColors(128)
      Common /theData/ XYZdata, contourcolors 

!Initialize TSI Graphics
      Call InitGraphicsPackage()

!Create data and load into XYZdata array
      CALL createData(XYZdata)

!Change Output window 
   Call SetOutputGraphWindowSize (20,20,600,300)
   
!Create a graphics window and hook up our subroutine
      Call DrawInNewWindow(CreatePlot)

!Move the FORTRAN text window off-screen
      Call MoveOutWindow(10,800,200,900)

!Exit and let the FORTRAN menus take over
      End
   
   
      Subroutine CreatePlot
   include 'tsiconstants.fi'
      INTEGER i
      REAL XYZdata(31,31)
      integer contourColors(128)
      Common /theData/ XYZdata, contourcolors 

!Set the contour colors
      DO i = 1, 128
        contourColors(i) = mod(i, 7)
      END DO


!Define two plot windows for the contour plot 
!and the 3D plot
      CALL SetPercentPlotRegion(1, 0.02,0.05, 0.48,0.95)
      CALL SetPercentPlotRegion(2, 0.52,0.05, 0.97,0.95)

!3D mesh plot
      CALL ChangePlotRegion(1)
      CALL SetPlotRatio(1, 0.1, 0.1, 0.1, 0.1)

!Set the size of the viewing rectangle
      Call Set3DViewingRect(-10.0,-10.0,10.0,10.0)

!Set the view point location
      Call Set3DEyePosition(15.0, 7.5, -10.0)

!Create the plot using a blue outline and yellow fill
      Call SetColor(blue)
      Call MeshPlot(XYZdata, 31, 31, -15., -15., 
 1.0, 1.0, yellow)

!  Switch to black and label the mesh using 
!18pt Palatino Bold-Italic
      Call SetColor(black)
      Call SetTextStyle('Palatino', 1+2, 0, 12)
      Call LabelGraph(500.0, 900.0, 
 'exp(r/5)sin(r/2)cos(2*phi)', 1, 0)

!Select region for the contour plot
      CALL ChangePlotRegion(2)
      CALL SetPlotRatio(2, 0.1, 0.1, 0.1, 0.1)

!Set plotting range scale 
      CALL SetXYPlottingRange( -15.0, -15.0, 15.0, 15.0)

!Change to black and draw axes
      CALL SetColor(black)

!Manually draw and label the lower pair of axes
      CALL SetXYIntercepts(-15.0,-15.0)
      CALL DrawYAxis(0.5,1)
      CALL LabelYAxis(10, 1)
      CALL DrawXAxis(0.5,1)
      CALL LabelXAxis(10,1)

!Manually draw and label the upper pair of axes
      CALL SetXYIntercepts(15.0,15.0)
      CALL DrawYAxis(0.5,0)
      CALL LabelYAxis(10,0)
      CALL DrawXAxis(0.5,0)
      CALL LabelXAxis(10,0)

!Border the plot area
      CALL BorderPlotRegion(black)
   
!Plot the data
      CALL ContourPlot(XYZdata,31,31,-15.0,-15.0, 
 1.0,1.0, 1.0,contourColors)

      Return
      END


      SUBROUTINE CreateData(XYZdata)
      INTEGER i,j
      REAL x,y,z,r
      REAL XYZdata(31,31)

!The subroutine for creating the data
      DO i = 1, 31
         x = REAL(i-16)
         DO j = 1, 31
             y = REAL(j-16)
  r = sqrt(x*x+y*y)
             z = 10.0 * exp (-r/5.) * sin(r/2.) *  
 cos(2.*atan2(x,y)) 
             XYZdata(i,j) = z
         END DO
      END DO
      END

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Never Gone (Games)
Never Gone 1.0.2 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0.2 (iTunes) Description: ###IMPPORTANT### Never Gone's HD art resources require devices with more than 1GB RAM, so please note that iPhone 4/4s, iPad 2/... | Read more »
INKS. (Games)
INKS. 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: From the makers of BAFTA-winning Lumino City comes INKS. INKS updates pinball for a new generation. It combines the joy of pinball with... | Read more »
How to maximise your profits in Bakery B...
Running a bakery can be an expensive venture. You’ll need to continuously upgrade your oven, your kitchen supplies, and even your ingredients to keep customers happy. Most of these renovations in Bakery Blitz cost a pretty penny, but we have a few... | Read more »
How to manage your time in Bakery Blitz
It can be tricky, especially when you risk burning your kitchen to the ground if you forget a cake in the oven, so make sure to use these time management tricks to keep your bakery running smoothly. Don’t collect the money right away [Read more] | Read more »
Model 15 (Music)
Model 15 1.0 Device: iOS iPhone Category: Music Price: $29.99, Version: 1.0 (iTunes) Description: The Moog Model 15 App is the first Moog modular synthesizer and synthesis educational tool created exclusively for iPad, iPhone and... | Read more »
How to deal with wind in Angry Birds Act...
Angry Birds Action! is a physics-based puzzler in which you're tasked with dragging and launching birds around an obstacle-littered field to achieve a set objective. It's simple enough at first, but when wind gets introduced things can get pretty... | Read more »
How to get three stars in every level of...
Angry Birds Action! is, essentially, a pinball-style take on the pull-and-fling action of the original games. When you first boot it up, you'll likely be wondering exactly what it is you have to do to get a good score. Well, never fear as 148Apps... | Read more »
The beginner's guide to Warbits
Warbits is a turn-based strategy that's clearly inspired by Nintendo's Advance Wars series. Since turn-based strategy games can be kind of tricky to dive into, see below for a few tips to help you in the beginning. Positioning is crucial [Read... | Read more »
How to upgrade your character in Spellsp...
So you’ve mastered the basics of Spellspire. By which I mean you’ve realised it’s all about spelling things in a spire. What next? Well you’re going to need to figure out how to toughen up your character. It’s all well and good being able to spell... | Read more »
5 slither.io mash-ups we'd love to...
If there's one thing that slither.io has proved, it's that the addictive gameplay of Agar.io can be transplanted onto basically anything and it will still be good fun. It wouldn't be surprising if we saw other developers jumping on the bandwagon,... | Read more »

Price Scanner via MacPrices.net

Global Tablet Sales Slump Continues, iPad’s F...
Another miserable showing for the global slate tablet category in calendar Q1/16, with global tablet shipments falling another 1ten percent to 46.5 million units during the according to Strategy... Read more
Revel Systems to Showcase iPad POS Platform w...
Revel Systems, specialists in iPad Point of Sale management solution for brick-and-mortar retail, food businesses and more, today announced that it will showcase its innovative iPad Point of Sale... Read more
13-inch 2.5GHz MacBook Pro on sale for $999,...
B&H Photo has the 13″ 2.5GHz MacBook Pro on sale for $999 including free shipping plus NY sales tax only. Their price is $100 off MSRP. Read more
Apple refurbished 2015 iMacs available for up...
Apple now has a full line of Certified Refurbished 2015 21″ & 27″ iMacs available for up to $350 off MSRP. Apple’s one-year warranty is standard, and shipping is free. The following models are... Read more
Indian Smartphone Market Grows Annually by 12...
India’s smartphone market grew by 12 percent year-over-year, with 24.4 million units shipping in Q1 2016. The top five vendors stayed the same, with Samsung in the lead, followed by Micromax, Intex... Read more
Get Notifications When Your Friend’s Phone Ba...
Calgary, Canada based Stonelight Pictures has announced the release of Battery Share 1.0.1, its new utility for iOS 9 supported devices. The company notes that people are spending more time on their... Read more
11-inch 1.6GHz/128GB MacBook Air on sale for...
Amazon has the current-generation 11″ 1.6GHz/128GB MacBook Air (sku MJVM2LL/A) on sale for $749.99 for a limited time. Their price is $150 off MSRP, and it’s the lowest price available for this model... Read more
Price drops on clearance 2015 13-inch MacBook...
B&H Photo has dropped prices on clearance 2015 13″ MacBook Airs by up to $250. Shipping is free, and B&H charges NY sales tax only: - 13″ 1.6GHz/4GB/128GB MacBook Air (MJVE2LL/A): $799, $200... Read more
Mac minis on sale for up to $100 off MSRP
B&H Photo has Mac minis on sale for up to $100 off MSRP including free shipping plus NY sales tax only: - 1.4GHz Mac mini: $449 $50 off MSRP - 2.6GHz Mac mini: $649 $50 off MSRP - 2.8GHz Mac mini... Read more
13-inch Retina MacBook Pros on sale for up to...
B&H Photo has 13″ Retina MacBook Pros on sale for $130-$200 off MSRP. Shipping is free, and B&H charges NY tax only: - 13″ 2.7GHz/128GB Retina MacBook Pro: $1169 $130 off MSRP - 13″ 2.7GHz/... Read more

Jobs Board

Restaurant Manager (Neighborhood Captain) - A...
…in every aspect of daily operation. WHY YOU'LL LIKE IT: You'll be the Big Apple . You'll solve problems. You'll get to show your ability to handle the stress and Read more
Simply Mac *Apple* Specialist- Service Repa...
Simply Mac is the largest premier retailer of Apple products in the nation. In order to support our growing customer base, we are currently looking for a driven Read more
Restaurant Manager (Neighborhood Captain) - A...
…in every aspect of daily operation WHY YOU LL LIKE IT You ll be the Big Apple You ll solve problems You ll get to show your ability to handle the stress and Read more
*Apple* Retail - Multiple Positions (US) - A...
Job Description:SalesSpecialist - Retail Customer Service and SalesTransform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
Restaurant Manager (Neighborhood Captain) - A...
…in every aspect of daily operation. WHY YOU'LL LIKE IT: You'll be the Big Apple . You'll solve problems. You'll get to show your ability to handle the stress and Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.