Compass Drawing

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As of October, 2016, Embarcadero is offering a free release of Delphi (Delphi 10.1 Berlin Starter Edition ).     There are a few restrictions, but it is a welcome step toward making more programmers aware of the joys of Delphi.  They do say "Offer may be withdrawn at any time", so don't delay if you want to check it out.  Please use the feedback link to let me know if the link stops working.

 

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Mensa Daily Puzzlers

For over 15 years Mensa Page-A-Day calendars have provided several puzzles a year for my programming pleasure.  Coding "solvers" is most fun, but many programs also allow user solving, convenient for "fill in the blanks" type.  Below are Amazon  links to the two most recent years.

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Here's a sample Compass drawing demonstration which will show how to draw and rotate the dial or the pointer in Delphi code. The angle
is specified in the "Heading" TSpinEdit control;

It uses a TPaintbox, "Compass", to repaint the compass when needed. Compass is completely redrawn for each call so its owner (Panel1) has its "Doublebuffered" property set True to prevent flashing when the space is cleared before redrawing.

It uses the TLogRec data structure and the CreateFontIndirect procedure to draw letters and numbers at right angles to the direction radial.

 

Download source code here 

Download executable

Created: July 22, 2010

Modified: July 29, 2017

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