williamjcm/raycastlib
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Allow negative coordinates

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This commit is contained in:
Miloslav Číž 2018-09-02 21:43:44 +02:00
parent ad5eca88fb
commit 06f0a49626
2 changed files with 22 additions and 2 deletions
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15
raycastlib.h
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@ -404,6 +404,12 @@ void castRayMultiHit(Ray ray, ArrayFunction arrayFunc, HitResult *hitResults,
currentSquare.x = ray.start.x / UNITS_PER_SQUARE; currentSquare.x = ray.start.x / UNITS_PER_SQUARE;
currentSquare.y = ray.start.y / UNITS_PER_SQUARE; currentSquare.y = ray.start.y / UNITS_PER_SQUARE;
if (ray.start.x < 0) // round down, not toward zero
currentSquare.x--;
if (ray.start.y < 0)
currentSquare.y--;
*hitResultsLen = 0; *hitResultsLen = 0;
int16_t squareType = arrayFunc(currentSquare.x,currentSquare.y); int16_t squareType = arrayFunc(currentSquare.x,currentSquare.y);
@ -446,8 +452,13 @@ void castRayMultiHit(Ray ray, ArrayFunction arrayFunc, HitResult *hitResults,
break; break;
} }
ray.start.x = currentPos.x % UNITS_PER_SQUARE; ray.start.x = currentPos.x < 0 ?
ray.start.y = currentPos.y % UNITS_PER_SQUARE; (UNITS_PER_SQUARE + currentPos.x % UNITS_PER_SQUARE - 1) :
(currentPos.x % UNITS_PER_SQUARE);
ray.start.y = currentPos.y < 0 ?
(UNITS_PER_SQUARE + currentPos.y % UNITS_PER_SQUARE - 1) :
(currentPos.y % UNITS_PER_SQUARE);
castRaySquare(ray,&no,&co); castRaySquare(ray,&no,&co);

9
test.c
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@ -124,6 +124,15 @@ int main()
16)) 16))
return 1; return 1;
if (!testSingleRay(
-4 * UNITS_PER_SQUARE - UNITS_PER_SQUARE / 2,
7 * UNITS_PER_SQUARE + UNITS_PER_SQUARE / 3,
100,-100,
0, 2,
1, 2900,
16))
return 1;
for (Unit i = -UNITS_PER_SQUARE; i <= UNITS_PER_SQUARE; i += 64) for (Unit i = -UNITS_PER_SQUARE; i <= UNITS_PER_SQUARE; i += 64)
{ {
Unit v = sinInt(i); Unit v = sinInt(i);