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[Impeller] Add lerps (flutter/engine#36430)

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This commit is contained in:
Brandon DeRosier 2022-09-26 17:33:34 -07:00 committed by GitHub
parent 410c81f785
commit 516d2f21d7
3 changed files with 34 additions and 1 deletions
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21
engine/src/flutter/impeller/geometry/geometry_unittests.cc
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@ -965,6 +965,27 @@ TEST(GeometryTest, PointAngleTo) {
}
}
TEST(GeometryTest, PointLerp) {
Point p(1, 2);
Point result = p.Lerp({5, 10}, 0.75);
Point expected(4, 8);
ASSERT_POINT_NEAR(result, expected);
}
TEST(GeometryTest, Vector3Lerp) {
Vector3 p(1, 2, 3);
Vector3 result = p.Lerp({5, 10, 15}, 0.75);
Vector3 expected(4, 8, 12);
ASSERT_VECTOR3_NEAR(result, expected);
}
TEST(GeometryTest, Vector4Lerp) {
Vector4 p(1, 2, 3, 4);
Vector4 result = p.Lerp({5, 10, 15, 20}, 0.75);
Vector4 expected(4, 8, 12, 16);
ASSERT_VECTOR4_NEAR(result, expected);
}
TEST(GeometryTest, CanUseVector3AssignmentOperators) {
{
Vector3 p(1, 2, 4);

4
engine/src/flutter/impeller/geometry/point.h
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@ -208,6 +208,10 @@ struct TPoint {
return Radians{std::atan2(this->Cross(p), this->Dot(p))};
}
constexpr TPoint Lerp(const TPoint& p, Scalar t) const {
return *this + (p - *this) * t;
}
constexpr bool IsZero() const { return x == 0 && y == 0; }
};

10
engine/src/flutter/impeller/geometry/vector.h
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@ -140,6 +140,10 @@ struct Vector3 {
return Vector3(x / scale, y / scale, z / scale);
}
constexpr Vector3 Lerp(const Vector3& v, Scalar t) const {
return *this + (v - *this) * t;
}
/**
* Make a linear combination of two vectors and return the result.
*
@ -224,10 +228,14 @@ struct Vector4 {
return Vector4(x - v.x, y - v.y, z - v.z, w - v.w);
}
constexpr Vector4 operator*(float f) const {
constexpr Vector4 operator*(Scalar f) const {
return Vector4(x * f, y * f, z * f, w * f);
}
constexpr Vector4 Lerp(const Vector4& v, Scalar t) const {
return *this + (v - *this) * t;
}
std::string ToString() const;
};