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#include "vector2d.h"
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bool
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vector2d_equals(Vector2d v1, Vector2d v2)
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{
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return v1.x == v2.x && v1.y == v2.y;
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}
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bool
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vector2d_is_opposite(Vector2d v1, Vector2d v2)
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{
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return ((v1.x > 0 && v2.x < 0) ^ (v1.y > 0 && v2.y < 0))
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|| ((v1.x < 0 && v2.x > 0) ^ (v1.y < 0 && v2.y > 0));
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}
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