45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
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#ifndef KARLOS_RECT_H
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#define KARLOS_RECT_H
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#include <stdbool.h>
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/* --> x
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* |
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* V y
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*/
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struct rect {
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int x, y, xend, yend;
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};
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#define RECT_XYWH(x, y, w, h) (struct rect){ (x), (y), (x + w), (y + h) }
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#define RECT_WIDTH(r) ((r).xend - (r).x)
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#define RECT_HEIGHT(r) ((r).yend - (r).y)
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#define RECT_XEND(r) ((r).xend)
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#define RECT_YEND(r) ((r).yend)
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// Moves `rect`.
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void rect_translate(struct rect *rect, int delta_x, int delta_y);
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// Clamps the rectangle `rect` to `boundary`.
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// The rect is cut off at the edges of `boundary`.
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// If there is no overlap, either width or height of the rect will be `0`.
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void rect_clamp(struct rect *rect, const struct rect *boundary);
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// Grows `rect` so that it encompasses both its original dimensions and `additional`.
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void rect_union(struct rect *rect, const struct rect *additional);
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// Example:
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// struct rect rect = RECT_XYWH(5, 10, 100, 100);
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// struct rect surrounding = RECT_XYWH(200, 200, 50, 500);
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// rect_local_to_global(&rect, &surrounding);
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// ASSERT(rect.x == 205 && rect.y == 210);
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// ASSERT(RECT_WIDTH(rect) == 45 && RECT_HEIGHT(rect) == 100);
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void rect_local_to_global(struct rect *rect, const struct rect *surrounding);
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unsigned int rect_area(struct rect *rect);
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bool rect_isempty(const struct rect *rect);
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#endif
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