Boots – shoes – and leggings
Patent
1984-04-26
1987-09-08
Williams, Jr., Archie E.
Boots, shoes, and leggings
364702, G06F 102, G06F 764
Patent
active
046928871
ABSTRACT:
A circle and circular arc generator has a digital differential analyzer (DDA) for receiving coordinates on and a radius of a circle having its center at a specific point and for generating x and y coordinates on a circle having its center at the origin. THe DDA has a carry detecting section for correcting the x or y coordinates for plotting an ellipse. The x coordinates and the radius of the circle are supplied from the DDA to a subtracter which adds and subtracts the input data to obtain x coordinates of rightmost and leftmost points of the target circle. The x and y coordinates from the DDA are incremented by incrementers and decremented by decrementers so as to obtain four points on the target circle which are symmetrical about the specific point. The generator also has a microprocessor for receiving start and end angles of the target circle and calculating status bit data which represent whether or not dots of the respective quadrants are plotted and position bit data which represent the relationships between coordinates of a current point and those of the start point and between coordinates of the current point and those of the end point. The x and y coordinates of the four points are plotted on the target circle in accordance with control data as combinations of the status bit data and the position bit data.
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Danielson; "Incremental Curve Generation"; IEEE Trans. on Computers; vol. C-19, No. 9, pp. 783-793, Sep. 1970.
Jordan et al.; An Improved Algorithm for the Generation of Nonparametic Curves"; IEEE Trans. on Computers; vol. C-22, No. 12, pp. 1052-1060; Dec. 1973.
Casio Computer Co. Ltd.
Shaw Dale M.
Williams Jr. Archie E.
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