I just finished writing my first Swift app for iOS. It’s the very common tutorial app “Tip Calculator” which accepts a bill amount and then shows a tip and total based on the selected tip percentage. The tutorial is from the book iOS for Programmers: An App-Driven Approach…
Continue readingI finally figured out how to change that Box Transport Mechanism from my previous post into a Linkage mechanism that works. All I needed to do was get rid of one of the links and then add a link to do the same thing using connectors that are…
Continue readingThe Stephenson Value mechanism on a locomotive is a mechanism that the Linkage program can’t simulate. I was asked by a user for help with a box transport mechanism and I see that it is another mechanism with the same issue Box Transport Mechanism In case that YouTube…
Continue readingOf course, this is just some freeware that you can download. The only change is that the Linkage page and the Linkage Download page all download version 3, not the old version 2. There is no way to get Linkage 2 anymore. No one reported any bug in…
Continue readingI am changing the way radii are drawn in the Linkage program. The old way was to show the radius value inside of the circle but that doesn’t seem typical, at least not in the U.S. New Radius Value Position The new way draws the radius value outside…
Continue readingTo anyone reading this blog, drector@rockclimbing.com is no longer a usable email address. rockclimbing.com is shutting off their email server. I will get forwarded emails from that address for a while, but please don’t use it anymore. I can be reached at my gmail address “rectorsquid”. Dave
Continue readingI just updated the Linkage 3.0 Beta files. The new version has a bug fix that caused some geared mechanisms to fail in the simulator. This came about because of how I now allow a gear to be placed on an input anchor, but be fastened to another…
Continue readingToday’s post is about writing code. More specifically, about document and view architectures. Code isolation, or encapsulation, is where one piece of code knows little or nothing about another. Right now, I am dealing with keeping the Linkage document separate from the Linkage view of that document. The…
Continue readingOrbiting Gears and Chain Mechanism I’m having a little trouble with the Linkage user interface. In the picture above, which is a nicely exported and scaled down JPEG image, I designed a mechanism to show an orbiting planet (gear 2) with an orbiting moon (connector F). Designing this…
Continue readingLinkage 3.0 is almost ready! I had a little trouble with the math for the gear and chain simulation. For a few minutes, I had very different code for the gear simulator and the chain simulator. I soon realized that I had figured out an improvement when working…
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