Four Bar Software Norton

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(Hint: If you can wait, current year calendars are usually on sale in January.) Contact: Send an e-mail with your comments about this program (or anything else). Search DelphiForFun.org only Problem Description Create a graphical simulation of a simple four-bar mechanical linkage. Background & Techniques Simulations of real world devices that move are some of the most challenging projects I have undertaken. This is especially true if the parts of the device interact with each other. A mechanical linkage is a good example. This program, Four-bar Linkage Version 3, is almost as simple as a linkage can be but with enough features to make it interesting to play with.

The linkage implemented has two fixed pivot points (connected by an implied rod) with a pivoting rod attached to each fixed point. The two pivoting rods are connected by the 4th rod.

If the short pivot rod is rotated and the long pivot rod extended, the result is a simple windshield wiper model. The program user can click and drag any of the rod end points to to vary how the points move as the first rod rotates. Right clicking on any rod end allows a trace of that point to be turned on or off. Buttons allow linkage definitions to be saved and loaded and an animation of the linkage movement to started or stopped.

A sliding bar allows control of the speed and direction. A second variation, included in the download samples, adds two more bars to form a 'truss' with the connecting rod, the tip of which will trace out some interesting patterns as the driving rod rotates.

There are additional configurations and movement options that will (might) be added to this initial checkpoint version to make it more generalized. See the 'Further Explorations' section at the bottom of the page. Non-programmers are welcome to read on, but may want to to download executable version of the program.

Notes for programmers A TLinkage class derived from TPaintbox provides the drawing space. TRod and TConnection classes work together to define the linkage. The rods are kept in TLinkage in an array. The connections are kept as objects in a TConnections class derived from a sorted Tstringlist with connection ids as the key field.

Drovosek 3 mihajlov. Each rod object contains an array of the ids of connection points on that rod. The OnPaint exit of TLinkage clears the screen and repaints the entire linkage each time the image must be redrawn. After updates, i.e.