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Add castRays function
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1 changed files with 71 additions and 4 deletions
75
raycastlib.h
75
raycastlib.h
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@ -36,8 +36,8 @@ typedef int32_t Unit; /**< Smallest spatial unit, there is UNITS_PER_SQUARE
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logVector2D(h.square);\
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printf(" pos: ");\
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logVector2D(h.position);\
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printf(" dist: %d", h.distance);\
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printf(" texcoord: %d", h.textureCoord);}\
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printf(" dist: %d\n", h.distance);\
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printf(" texcoord: %d\n", h.textureCoord);}\
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/// Position in 2D space.
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typedef struct
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@ -74,14 +74,17 @@ typedef struct
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@return The first collision result.
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*/
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/**
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Like castRaysMultiHit but only returns the first hit.
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*/
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HitResult castRay(Ray ray, int16_t (*arrayFunc)(int16_t, int16_t),
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uint16_t maxSteps);
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/**
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Casts a single ray and returns a list of collisions.
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*/
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void castRayMultiHit(Ray ray, int16_t (*arrayFunc)(int16_t, int16_t),
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void castRayMultiHit(Ray ray, int16_t (*arrayFunc)(int16_t x, int16_t y),
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uint16_t maxSteps, HitResult *hitResults, uint16_t *hitResultsLen,
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uint16_t maxHits);
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@ -91,6 +94,25 @@ Unit sinInt(Unit input);
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uint16_t sqrtInt(uint32_t value);
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Unit dist(Vector2D p1, Vector2D p2);
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/**
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Converts an angle in whole degrees to an angle in Units that this library
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uses.
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*/
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Unit degreesToUnitsAngle(int16_t degrees);
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///< Computes the change in size of an object due to perspective.
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Unit perspectiveScale(Unit originalSize, Unit distance, Unit fov);
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/**
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Casts rays for given camera view and for each hit calls a user provided
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function.
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*/
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void castRaysMultiHit(
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Vector2D position, Unit directionAngle, Unit fovAngle, uint16_t resolution,
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int16_t (*arrayFunc)(int16_t x, int16_t y),
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void (*hitFunc)(uint16_t pos, HitResult hit, uint16_t hitNo, Ray r),
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uint16_t maxHits, uint16_t maxSteps);
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//=============================================================================
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// privates
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@ -319,4 +341,49 @@ HitResult castRay(Ray ray, int16_t (*arrayFunc)(int16_t, int16_t),
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return result;
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}
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void castRaysMultiHit(
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Vector2D position, Unit directionAngle, Unit fovAngle, uint16_t resolution,
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int16_t (*arrayFunc)(int16_t x, int16_t y),
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void (*hitFunc)(uint16_t pos, HitResult hit, uint16_t hitNo, Ray r),
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uint16_t maxHits, uint16_t maxSteps)
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{
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uint16_t fovHalf = fovAngle / 2;
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Vector2D dir1 = angleToDirection(directionAngle - fovHalf);
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Vector2D dir2 = angleToDirection(directionAngle + fovHalf);
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Unit dX = dir2.x - dir1.x;
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Unit dY = dir2.y - dir1.y;
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HitResult hits[maxHits];
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uint16_t hitCount;
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Ray r;
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r.start = position;
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for (uint8_t i = 0; i < resolution; ++i)
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{
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r.direction.x = dir1.x + (dX * i) / resolution;
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r.direction.y = dir1.y + (dY * i) / resolution;
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castRayMultiHit(r,arrayFunc,maxSteps,hits,&hitCount,maxHits);
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for (uint8_t j = 0; j < hitCount; ++j)
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hitFunc(i,hits[j],j,r);
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}
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}
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Unit degreesToUnitsAngle(int16_t degrees)
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{
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return (degrees * UNITS_PER_SQUARE) / 360;
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}
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Unit perspectiveScale(Unit originalSize, Unit distance, Unit fov)
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{
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distance *= fov;
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distance = distance == 0 ? 1 : distance; // prevent division by zero
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return originalSize / distance;
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}
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#endif
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