132 lines
5.3 KiB
C++
132 lines
5.3 KiB
C++
#include <gtest/gtest.h>
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#include <cmath>
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#include <vector>
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#include "interact/SlicePlaneMath.hpp"
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using namespace geopro::render::interact;
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namespace {
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void expectVec(const Vec3& a, double x, double y, double z, double eps = 1e-9) {
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EXPECT_NEAR(a[0], x, eps);
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EXPECT_NEAR(a[1], y, eps);
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EXPECT_NEAR(a[2], z, eps);
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}
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} // namespace
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// ── axisNormal：轴向法向（spec F22–F24）+ 任意 45°（F25）──
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TEST(SlicePlaneMath, AxisNormalUpDownIsZ) { expectVec(axisNormal(SliceAxis::UpDown), 0, 0, 1); }
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TEST(SlicePlaneMath, AxisNormalFrontBackIsY) { expectVec(axisNormal(SliceAxis::FrontBack), 0, 1, 0); }
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TEST(SlicePlaneMath, AxisNormalLeftRightIsX) { expectVec(axisNormal(SliceAxis::LeftRight), 1, 0, 0); }
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TEST(SlicePlaneMath, AxisNormalObliqueIs45) {
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const auto n = axisNormal(SliceAxis::Oblique);
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const double s = std::sqrt(0.5);
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expectVec(n, s, 0, s);
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EXPECT_NEAR(norm(n), 1.0, 1e-9); // 单位向量
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}
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// ── boundsCenter ──
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TEST(SlicePlaneMath, BoundsCenter) {
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expectVec(boundsCenter({0, 10, -4, 4, 0, 6}), 5, 0, 3);
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}
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// ── advanceOrigin：沿法向平移（滚轮推进，D46）──
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TEST(SlicePlaneMath, AdvanceAlongZ) {
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expectVec(advanceOrigin({1, 2, 3}, {0, 0, 1}, 5.0), 1, 2, 8);
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}
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TEST(SlicePlaneMath, AdvanceBackward) {
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expectVec(advanceOrigin({1, 2, 3}, {0, 0, 1}, -2.0), 1, 2, 1);
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}
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TEST(SlicePlaneMath, AdvanceNormalizesDirection) {
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// 非单位法向：先归一化再推进，步长为世界距离。
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expectVec(advanceOrigin({0, 0, 0}, {0, 0, 5}, 3.0), 0, 0, 3);
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}
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TEST(SlicePlaneMath, AdvanceObliqueMovesAlong45) {
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const auto o = advanceOrigin({0, 0, 0}, {1, 0, 1}, std::sqrt(2.0));
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expectVec(o, 1, 0, 1); // 沿 45° 推进 √2 → (1,0,1)
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}
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// ── clampToBounds：推进出体外被夹回（滚轮限位）──
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TEST(SlicePlaneMath, ClampInsideUnchanged) {
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expectVec(clampToBounds({5, 0, 3}, {0, 10, -4, 4, 0, 6}), 5, 0, 3);
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}
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TEST(SlicePlaneMath, ClampOutsideHigh) {
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expectVec(clampToBounds({5, 0, 99}, {0, 10, -4, 4, 0, 6}), 5, 0, 6);
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}
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TEST(SlicePlaneMath, ClampOutsideLow) {
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expectVec(clampToBounds({-5, 0, -1}, {0, 10, -4, 4, 0, 6}), 0, 0, 0);
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}
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// ── faceOnCamera：双击正视（E54）──
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// 法向 +Y：相机退到 focal+Y*dist，视线 = -Y，viewUp = +Z（切面内向上）。
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TEST(SlicePlaneMath, FaceOnFrontBackNormal) {
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const auto cam = faceOnCamera({0, 0, 0}, {0, 1, 0}, 10.0);
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expectVec(cam.position, 0, 10, 0);
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// viewUp 与法向正交且偏 +Z。
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EXPECT_NEAR(dot(cam.viewUp, Vec3{0, 1, 0}), 0.0, 1e-9);
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EXPECT_GT(cam.viewUp[2], 0.5);
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}
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// 法向 +X：position=focal+X*dist，viewUp 偏 +Z。
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TEST(SlicePlaneMath, FaceOnLeftRightNormal) {
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const auto cam = faceOnCamera({1, 2, 3}, {1, 0, 0}, 5.0);
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expectVec(cam.position, 6, 2, 3);
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EXPECT_NEAR(dot(cam.viewUp, Vec3{1, 0, 0}), 0.0, 1e-9);
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EXPECT_GT(cam.viewUp[2], 0.5);
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}
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// 法向竖直 +Z（上下切片）：viewUp 不能再取 +Z（与法向共线），兜底取 +Y。
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TEST(SlicePlaneMath, FaceOnVerticalNormalFallsBackToY) {
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const auto cam = faceOnCamera({0, 0, 0}, {0, 0, 1}, 8.0);
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expectVec(cam.position, 0, 0, 8);
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// viewUp 与法向(+Z)正交（z≈0），且非零。
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EXPECT_NEAR(cam.viewUp[2], 0.0, 1e-9);
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EXPECT_NEAR(norm(cam.viewUp), 1.0, 1e-9);
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}
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// 法向竖直 -Z 同样兜底。
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TEST(SlicePlaneMath, FaceOnVerticalDownNormalFallsBack) {
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const auto cam = faceOnCamera({0, 0, 0}, {0, 0, -1}, 4.0);
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expectVec(cam.position, 0, 0, -4);
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EXPECT_NEAR(cam.viewUp[2], 0.0, 1e-9);
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EXPECT_NEAR(norm(cam.viewUp), 1.0, 1e-9);
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}
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// 非单位法向：position 用归一化法向 → 距焦点恰为 dist。
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TEST(SlicePlaneMath, FaceOnNormalizesNormal) {
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const auto cam = faceOnCamera({0, 0, 0}, {0, 3, 0}, 6.0);
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expectVec(cam.position, 0, 6, 0);
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}
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// ── wheelStep：滚轮推进步长（按对角线比例 × 方向）──
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TEST(SlicePlaneMath, WheelStepForwardPositive) {
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EXPECT_GT(wheelStep({0, 10, 0, 0, 0, 0}, +1), 0.0);
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}
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TEST(SlicePlaneMath, WheelStepBackwardNegative) {
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EXPECT_LT(wheelStep({0, 10, 0, 0, 0, 0}, -1), 0.0);
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}
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TEST(SlicePlaneMath, WheelStepScalesWithBounds) {
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const double small = wheelStep({0, 10, 0, 0, 0, 0}, 1);
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const double big = wheelStep({0, 100, 0, 0, 0, 0}, 1);
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EXPECT_GT(big, small); // 体越大步长越大
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}
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// ── nearestPlane：找点所在切片（按到平面距离最小）──
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TEST(SlicePlaneMath, NearestPlaneEmptyIsMinusOne) {
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EXPECT_EQ(nearestPlane({}, {}, {0, 0, 0}), -1);
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}
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TEST(SlicePlaneMath, NearestPlanePicksClosest) {
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// 两张水平切片 z=0 与 z=10（法向 +Z）；点 z=8 → 更近 z=10（索引 1）。
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std::vector<Vec3> centers{{0, 0, 0}, {0, 0, 10}};
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std::vector<Vec3> normals{{0, 0, 1}, {0, 0, 1}};
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EXPECT_EQ(nearestPlane(centers, normals, {5, 5, 8}), 1);
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EXPECT_EQ(nearestPlane(centers, normals, {5, 5, 2}), 0);
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}
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TEST(SlicePlaneMath, NearestPlaneIgnoresInPlaneOffset) {
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// 单张 z=0 水平面：点无论 x/y 多远，只要 z=0 距离为 0 → 命中。
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std::vector<Vec3> centers{{0, 0, 0}};
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std::vector<Vec3> normals{{0, 0, 1}};
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EXPECT_EQ(nearestPlane(centers, normals, {999, -999, 0}), 0);
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}
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// ── 向量工具 ──
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TEST(SlicePlaneMath, NormalizeZeroFallsBack) { expectVec(normalize({0, 0, 0}), 0, 0, 1); }
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TEST(SlicePlaneMath, CrossBasic) { expectVec(cross({1, 0, 0}, {0, 1, 0}), 0, 0, 1); }
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