Created
October 8, 2016 13:59
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| bool raycast_map(const std::vector<Oddlib::Path::CollisionItem>& lines, const glm::vec2& line1p1, const glm::vec2& line1p2, int collisionType, Physics::raycast_collision* const collision) | |
| { | |
| const Oddlib::Path::CollisionItem* nearestLine = nullptr; | |
| float nearestCollisionX = 0; | |
| float nearestCollisionY = 0; | |
| float nearestDistance = 0.f; | |
| bool hasCollided = false; | |
| bool firstCollision = true; | |
| for (const Oddlib::Path::CollisionItem& line : lines) | |
| { | |
| if (line.mType != collisionType) { continue;} | |
| float intersectionX = 0; | |
| float intersectionY = 0; | |
| float line1p1x = line1p1.x; | |
| float line1p1y = line1p1.y; | |
| float line1p2x = line1p2.x; | |
| float line1p2y = line1p2.y; | |
| float line2p1x = line.mP1.mX; | |
| float line2p1y = line.mP1.mY; | |
| float line2p2x = line.mP2.mX; | |
| float line2p2y = line.mP2.mY; | |
| // Get the segments' parameters. | |
| float dx12 = line1p2x - line1p1x; | |
| float dy12 = line1p2y - line1p1y; | |
| float dx34 = line2p2x - line2p1x; | |
| float dy34 = line2p2y - line2p1y; | |
| // Solve for t1 and t2 | |
| float denominator = (dy12 * dx34 - dx12 * dy34); | |
| float t1 = ((line1p1x - line2p1x) * dy34 + (line2p1y - line1p1y) * dx34) / denominator; | |
| if (isinf(t1)) | |
| continue; | |
| float t2 = ((line2p1x - line1p1x) * dy12 + (line1p1y - line2p1y) * dx12) / -denominator; | |
| // Find the point of intersection. | |
| intersectionX = line1p1x + dx12 * t1; | |
| intersectionY = line1p1y + dy12 * t1; | |
| // The segments intersect if t1 and t2 are between 0 and 1. | |
| hasCollided = ((t1 >= 0) && (t1 <= 1) && (t2 >= 0) && (t2 <= 1)); | |
| if (hasCollided) | |
| { | |
| float distance = sqrtf(powf((line1p1x - intersectionX), 2) + powf((line1p1y - intersectionY), 2)); | |
| if (firstCollision || distance < nearestDistance) | |
| { | |
| nearestCollisionX = intersectionX; | |
| nearestCollisionY = intersectionY; | |
| nearestDistance = distance; | |
| nearestLine = &line; | |
| firstCollision = false; | |
| } | |
| } | |
| if (nearestLine) | |
| { | |
| if (collision) | |
| { | |
| collision->intersection.x = nearestCollisionX; | |
| collision->intersection.y = nearestCollisionY; | |
| } | |
| //*collisionX = (int)(nearestCollisionX * 0x10000); | |
| //*collisionY = (int)(nearestCollisionY * 0x10000); | |
| //*collision = nearestLine; | |
| return true; | |
| } | |
| } | |
| return false; | |
| } |
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