Okay. I’ll admit that this project has taken over my brain. It’s been fun for me to work on it and dust off some of my programming skills. This will be another small update as I haven’t had a lot of free time this past week but enough to get some work done. If you haven’t read them yet, the early posts are here: original post, update 1, update 2, & update 3

The good news is that I think there will just be two more updates and we’ll have the completed map. There might be a few more after that for upgrades to the software but those will probably be a bit more spaced out. Here’s what’s left to do:

• Random generation of spectral types (this post)
• Complete “Alpha Dawn” map (this post)
• Complete “Player’s Version” of the Extended Frontier map (update 5) – This is the full color version of the B&W map I’ve been posting
• Complete “Referee’s Version” of the Extended Frontier map (update 6) – This will be a version of the map with all the Sathar system labels and jump routes included.

I’ve decided that to get to the completed map, I’ll just do the nebulae by hand. I already have the shapes drawn on the B&W version of the map so it’s easy enough to transfer them and do the render. Getting the software to do the nebulae will be a future project.

If there is interest, I could also do a remake of the Zebulon’s Guide to Frontier Space version of the Frontier map in this style. While I’ve modified my map to match most of the named systems on the Zeb’s Guide map, they are not exactly the same (for reasons discussed in earlier posts) and the unexplored stars do no match between the two maps. If there is a large clambering for it, I’ll do that as a future project.

Let’s get on with this week’s update:

Random Stellar Types

After I had the program interpolating the colors between the base spectral types, the next step was to sit down and code up the random generation of those spectral sub-types. I needed this to randomly fill in all the “unexplored” systems with a proper mix of spectral types. The explored systems are way too heavily weighted toward the F & G stars and there are a few too many (i.e more than about 3) for the number of stars in the region but that’s okay.

In any case, I wanted the relative numbers to be approximately correct based on real stellar distributions so I busted out data on the stellar mass functions and after a bit of math came up with a d100 table for the various main sequence spectral types (A, B, G, etc.) to determine the relative ratio of their sub-types (A0, A2, A4, etc). Once I had the numbers it was a simple matter to code up a few subroutines to generate the values. There are some refinements I could make in the future but this is good enough for now.

Complete “Alpha Dawn” Map

Once the program was generating random spectral types in the correct distribution, it was time to finish the smaller map corresponding to the Frontier provided in the original printing of the game and the later “Alpha Dawn” reprint (named to distinguish the core rules from the Knight Hawks supplement).

I did this by running a random map and then taking the spectral types generated and applied them to the remaining systems in the original map. Next I took the resulting file and edited it to tweak the positioning of some of the labels so that they weren’t overlapping any of the jump lines or other text. Finally, I took the nebulae I had created for the earlier version and imported them into this map. This gave me my final version of the smaller map.

I might revisit this in the future and do the nebula with different colors but for all intents and purposes, this one is done.

In making this I realized that the stars in system FS18 are really bright. It’s an M0 Giant and A0 main sequence star in a binary system. Combined, they are ~39x brighter than the sun and only 2 ly from Athor. That means they would appear to be at -5.27 magnitude star in the night sky. For reference, the brightest star in our sky, Sirius, is only -1.46 (small, more negative numbers are brighter). Venus, at its brightest, is a -4.2 magnitude object. That means that this star appears 2.5 times brighter than Venus at it’s brightest and about 30 times brighter than Sirius.

The Full Map

Now that the AD map is done, it’s time to start working on the full Extended Frontier map. I knew I was going to need a lot of random star systems so I generated a big random map with the program to get a good number of star systems with the correct spectral type distribution. I’ll use this whenever I need a random system value.

That done, the first step was to get the data for all the various labeled systems on the map. I already had the ones from the AD map I just needed to add the others. The data for these systems came from a variety of places. For the systems included on the Zeb’s Guide map, I used the spectral types listed in Zeb’s Guide after verifying that they made sense when mentioned in the modules (which usually just gave a color). I didn’t find any real issues so I just used the Zeb’s Guide values.

For the Saurian systems (east of the Frontier), the spectral types were taken from the article “The Sauria Sector” published in the Frontier Explorer, issue 4.

The data for the S’sessu systems (south of the Frontier), the spectral types were taken from the article “Phri’sk Anyone? Detailing the S’sessu Homeworlds” in issue 16 of the Frontier Explorer (p 23 – I haven’t gotten around to putting the individual articles of that issue on-line yet). However, that article only listed spectral types for two of the systems. For the other three, I selected random spectral types in the G & K spectral types from the list of random systems.

With all the star systems in place, I added in all the jump routes connecting those systems. I discovered I had a limit in my code that would not print a jump if it was over 14 light years in length. This was preventing the jump between Gruna Garu and Lynchpin from being drawn so I had to fix that bug. I still don’t let the random process create jumps that long but if you’re entering the data for a map and want a longer connection, the software won’t stop you anymore.

This also required me to change a couple of things. If you’re familiar with Zeb’s Guide, you may notice that the connection between Zebulon and Capella is now a straight line at 9 ly instead of a broken line at 10 ly. The broken line never made any sense given the Knight Hawks rules so I’ve done away with it. The other change was the connection between the S’sessu worlds of Kashra’sk and Minan. The map in the Frontier Explorer lists the distance as 12 ly but it is actually only 11. That is fixed on this map.

The next step is to now add in all the other systems on the map. To do this, I simply pull a system entry from the big random list for each star system on the map and remove the system from the big list so I don’t reuse it. I started in on that process, filling in the systems to the southwest of the Frontier but haven’t finished entering everything else yet. That will be the subject of the next update. However, here’s the big map as it currently stands.

This is just the raw, software generated map, with no tweaking or extra annotations on it. Over the next week or two, I’ll start adding in the rest of the stars and the nebulae. This map covers an area 90 ly wide and 100 ly high which should give your players plenty of area to explore if they need to get out of the Frontier and into the wilds.

That’s it for now

That’s where the project currently stands. If you have any thoughts, questions, or suggestions, let me know in the comments below.

It’s been a fairly busy couple of weeks between family vacation and recovering from said vacation. I’ve been working on the map project but a lot of it has been behind the scenes and not anything that is easily displayable although some progress has been made. Additionally, I took the first steps toward getting the Murder at Rosegard adventure actually written up into a coherent document but again, nothing to display. So on to the map work.

Working on the Nebulae

This first bit definitely falls into the non-visible bit. I began implementing code that will allow me to draw the nebula. Over the past couple of weeks I figured out an good algorithm to use to trace the grid boxes containing the nebula and dived a bit into the code for SVG graphics to understand how to draw curvy lines.

There is nothing to see here yet but the next steps that I’ll be working on are:

• Write the code that draws the curvy boundaries for a predefined nebula region
• Write code to read in nebula regions from the data file
• Write code to randomly generated nebula regions from some to-be-specified parameters.

That will probably be the content of the next update.

Stellar colors

The other major bit I worked on was adding in code to interpolate the colors of the stars based on their actual spectral type. Originally, the code could just handle a few spectral types: B0, A0, F0, G0, K0, & M0 plus a few special types like brown & white dwarfs, black holes, and neutron stars. That is what you’ve been seeing in the maps to date.

The colors for those stars were picked partially to be visually accurate and partially to aesthetically pleasing. Basically I had to exaggerate the color variations between the stars as almost all of them would appear white to the human eye. The interpolated colors will smoothly shift between these predefined colors.

What I wanted was to be able to handle any spectral type, i.e. G2, F3, K7, M5, etc. To do this I needed to interpolate the colors down the spectral sequences. It took a bit of reworking the code to do the interpolation and that’s were I spent most of the time I had this week.

Once that was done, I went back through and put in the actual spectral types for all of the named Frontier sector stars. These were derived from a variety of places. In the original rules, the stars were just given colors which correspond roughly to spectral types. Then there were a few more details in the published modules. Zebulon’s Guide to Frontier Space provided actual spectral type designations for all the stars in the Frontier. However, some of those spectral types in Zeb’s Guide didn’t agree with the previously published material.

This isn’t the first time I’ve tried to do this and luckily, the last time I did it, I recorded all the information. That was done on my Star Frontiers Network Wiki in the Frontier Travel Guide section. So for most of the stars, all I had to do was go through the pages on the wiki and grab the spectral types I had already figured out for each star.

With those code updates, and the updated spectral type values, you get the following map of the Frontier.

There are a couple of things missing from this map. First, I didn’t put the nebula back on as this was a test of the spectral colors. Plus I didn’t do anything for Padda or the star systems labeled with the FSnn designations. Those are still at the “0” spectral types. I will get to those but there is another bit of the code I want to update first (more below).

Oh yea, @Fiddleback on Twitter mentioned he couldn’t see his house and I promised him a zoom box.

The Full Map

The other thing I worked on was getting everything set up for the big map of the full extended Frontier region. This mainly involved just translating the systems in this map to the larger canvas.

There’s no difference between this one and the one above, it is just situated on the canvas is the correct position to correspond to the big black and white map. Over the next little while I’ll be adding in all the other systems as I extract their coordinates from the big map into the data file that generates this map. Watch for updates in the future.

What’s Next?

I’ve already mentioned the work on the nebulae that I have on deck. On the spectral type front there are a few things I want to add there as far as functionality goes.

First, (this is the bit I hinted at above) I want to add code to the random system generation to properly generate the 0-9 subtypes. The relative ratios of major types (A, G, M, etc.) are accounted for but I need to get the relative numbers withing the major types correct. I have the data (or can get it) to do that, I just need to crunch the numbers and write the code. Once that’s done, I’ll add real spectral types to the systems labeled with the FSnn designation and really be ready to generate the full map.

With the spectral types the other things I need to do include:

• Add code for drawing non-main sequence stars. Right now it handles all the main sequence stars (luminosity class V) and some giants and super-giants (luminosity classes III and I) but it may need to handle more when I get the full random generator done.
• Add some interpolation of stellar sizes for main sequence K stars. Right now they are set to a fixed size but I’d like the later K stars to be a bit smaller than the G and early K stars and approach the size of the M stars. Again, the data is there in the program, I just need to code the interpolation.
• Fix the color interpolation for M stars. It’s not obvious in the map that there is a problem since I don’t have any M stars that aren’t M0 but as you progress down the spectral sequence I’m interpolating to the colors of the Brown Dwarfs which are a pinkish color (In real life they’d be a really dull red which doesn’t stand out on the map). I want to make the interpolation go to a deeper red instead of pink. This should be a really quick fix. I know what needs to be done, I just need to code it up and test it.

Since I can do the nebula by hand for the Extended Frontier map, this work on the spectral types is where I’ll be focusing my efforts for the next little while. Once those updates are done, I’ll have everything I need to make the full-color Extended Frontier map.

The Code

Again, If you want to play with the code as I’m working on it, you can grab the current version from my StarMapGen repository on GitHub. This is still not the most user-friendly program to run as it it requires coding in all the parameters by hand before running but that’s on my todo list as well.