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This paper describes the considerations involved in predicting the shapes of shadows cast by buildings for any hour, day or month of the year and for any location on Earth. The power of APL is demonstrated in the general solutions possible for the problem irrespective of the shape of the building provided that it is composed of regular cylinders or prisms. Direct access to the Macintosh Quickdraw functions allows the production of graphical output of high resolution and using any of the available printing fonts. The system described makes use of Macintosh menus and dialogue boxes for data input and workflow control. The result is a system with an appearance similar to other Macintosh applications, such as, MacWrite, Word or MacDraw and the user is unaware of the presence of APL.

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The use of APL.68000 access to the Macintosh quickdraw system for the productio n of shadows cast by buildings

Julian, W. G.
ACM SIGAPL APL Quote Quad , Volume 18 (2)
Association for Computing MachineryDec 1, 1987

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