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41 lines
1.1 KiB
C
41 lines
1.1 KiB
C
5 years ago
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#ifndef SHAPE_H
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#define SHAPE_H
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#include <stdint.h>
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/* Shape's attributes... */
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typedef struct {
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struct ShapeVtable const *vptr; /* virtual pointer */
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int16_t x; /* x-coordinate of Shape's position */
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int16_t y; /* y-coordinate of Shape's position */
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} Shape;
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struct ShapeVtable {
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void (*draw)(Shape const * const me);
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uint32_t (*area)(Shape const * const me);
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};
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/* Shape's operations... */
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void Shape_ctor(Shape * const me, int16_t x0, int16_t y0);
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void Shape_moveBy(Shape * const me, int16_t dx, int16_t dy);
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uint16_t Shape_distanceFrom(Shape const * const me,
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Shape const * other);
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/* virtual calls (late binding) */
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static inline void Shape_draw_vcall(Shape const * const me) {
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(*me->vptr->draw)(me);
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}
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static inline uint32_t Shape_area_vcall(Shape const * const me) {
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return (*me->vptr->area)(me);
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}
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#define SHAPE_DRAW_VCALL(me) (*(me)->vptr->draw)((me))
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#define SHAPE_AREA_VCALL(me) (*(me)->vptr->area)((me))
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/* draw all shapes in a given array graph[] */
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void drawGraph(Shape const *graph[]);
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#endif /* SHAPE_H */
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