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39 lines
922 B
C
39 lines
922 B
C
#include "position_util.h"
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#include "MSL_C/stdlib.h"
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const s32 POSITION_DISPLACEMENT_TO_DIRECTION[3][3] =
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{
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{DIR_UP_LEFT, DIR_UP, DIR_UP_RIGHT},
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{DIR_LEFT, DIR_DOWN, DIR_RIGHT},
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{DIR_DOWN_LEFT, DIR_DOWN, DIR_DOWN_RIGHT}
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};
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s32 GetDirectionTowardsPosition(struct position *origin, struct position *target)
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{
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s32 x_diff = target->x - origin->x;
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s32 y_diff = target->y - origin->y;
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if (x_diff == 0 && y_diff == 0)
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return DIR_DOWN;
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if (x_diff >= 1)
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x_diff = 1;
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if (y_diff >= 1)
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y_diff = 1;
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if (x_diff <= -1)
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x_diff = -1;
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if (y_diff <= -1)
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y_diff = -1;
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return POSITION_DISPLACEMENT_TO_DIRECTION[++y_diff][++x_diff];
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}
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s32 GetChebyshevDistance(struct position *position_a, struct position *position_b)
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{
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s32 var1 = abs(position_a->x - position_b->x);
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s32 var0 = abs(position_a->y - position_b->y);
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return MAX(var1, var0);
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}
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