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This is the first of hopefully many text tutorials for the Linkage Mechanism Designer and Simulator. Videos are great but a bit harder to make than this written stuff. Planetary gears are a set of gears where one gear rotates around another and another outer gear, always an…
Continue readingI thought that the Linkage program, with the addition of external gears, would handle a planetary transmission just fine. I was wrong. Aside from the issue of having to drive this with a chain, which is necessary because making the center connector of the gear train an input…
Continue readingI found a really weird sliding connector bug. If the connectors B and C are very very close to vertical but not quite exactly vertical, a math problem causes the mechanism to fail at a seemingly random position. In this case, I saw it fail about 3/4 of…
Continue readingApple did a fairly nice job with the @IBAction mechanism. It’s easy to add code to handle a menu item action in a macOS program. It’s the same with iOS for button taps and other UI actions. But with the menu items, there is a severe oversight that…
Continue readingI hope no one ever thinks that the Tabletop Score Calculator is just a physical calculator that is too big to stick in your pocket! The Tabletop Score Calculator is an iOS app I’m working on that will have virtual score sheets for various tabletop games. After another…
Continue readingI’m working on a board game scoring app. It’s an iOS app because I frankly don’t like writing Java for Android. This is an iOS app written in Swift and it runs on iOS 10 and newer. The score calculator uses some basic iOS UI elements like a…
Continue readingI fixed the selection box issue and the control points are included. There actually are control points associated with the line segments of the curve but they are not used and not displayed. I have been adding code to allow for editing of curves in the context of…
Continue readingI did a little work last night to the node smoothing code for the end points of the Bezier curves. I also added code to handle line segments withing the compound curve. Fancier Compound Curves The first and last segments are now lines instead of curves. Notice that…
Continue readingI spent some time designing data structures to hold the compound curves that will be used for enhanced drawing elements and cams in the Linkage software. The data structure is designed with the idea that there is a single Curve type of object that contains nodes and segments…
Continue readingI am about to add curve drawing to the Linkage program. The curves will be compound curves, or whatever you would call a chain of elements that can be lines, arcs, or Bezier curves. To start work on this, the first thing I did was remind myself how…
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