Animated Movie Language (ID:5257/bef003)

Animation language 

An Example of Movie Language Coding




The actual program which produced Fig. 2a is here given as an example of movie language coding. It consists of five parts: definitions of new macro-instructions, coding for composing the picture, coding for outputting the picture, closed subroutines, and descriptions of text to be typed. Particular attention should be paid to the first section, which illustrates how the programmer devices his own macro-instructions on a still higher level, instructions which are either more powerful or which are more specifically suited to a particular task.




A new macro-instruction of wide application, BENTLN, is used for drawing any line which consists of a series of straight line segments, such as the two braces of Fig. 2a. BENTLN is defined in terms of SEGMNT, which compiles into a call for the subroutines SEG . . . that actually draws one segment of the line. The new macro-instruction, SURF, on the other hand, was designed specifically for Figs. 2a and 2b. It permits convenient description of the position and size of a surface in the drawing and of labels indicating its name and its size in squares.













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