8000 add project point to plane by chuongmep · Pull Request #402 · GSharker/G-Shark · GitHub
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add project point to plane #402

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Merged
merged 4 commits into from
Feb 6, 2023
Merged

add project point to plane #402

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46f71cc
add project point to plane
chuongmep Jan 12, 2023
4bdbee5
fix spell
chuongmep Jan 17, 2023
582fb39
pass only a plane as input
chuongmep Jan 17, 2023
314e5eb
update text description
chuongmep Feb 6, 2023
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19 changes: 19 additions & 0 deletions src/GShark.Test.XUnit/Geometry/Point3Tests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,24 @@ public void It_Checks_If_A_Point_Lies_On_A_Plane()
// Assert
pt.IsOnPlane(plane, 0.001).Should().BeTrue();
}

[Fact]
public void If_Check_Project_A_Point_On_A_Plane()
{
// Arrange
Point3 point = new Point3(10, 20, -5);
Point3 planeOrigin = new Point3(0, 10, 0);
Vector3 direction = new Vector3(0, 1, 0);
Plane plane = new Plane(planeOrigin, direction);
var expectedPt = new Point3(10, 10, -5);

// Act
var result = point.ProjectToPlan(plane);

// Assert
result.Should().BeEquivalentTo(expectedPt);
result.Equals(expectedPt).Should().Be(true);
}

[Fact]
public void It_Returns_The_Linear_Interpolation_Between_Two_Points()
Expand All @@ -71,6 +89,7 @@ public void It_Returns_The_Linear_Interpolation_Between_Two_Points()
var result = Point3.Interpolate(p1, p2, amount);

// Assert

result.Equals(expectedPoint).Should().Be(true);
}

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14 changes: 14 additions & 0 deletions src/GShark/Geometry/Point3.cs
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Expand Up @@ -527,6 +527,19 @@ public double DistanceTo(Point3 other)
}
return d;
}

/// <summary>
/// Projects a point onto a plane.
/// </summary>
/// <param name="plane">Plane to project onto</param>
/// <returns name="point3">The point projected to plane</returns>
public Point3 ProjectToPlan(Plane plane)
{
Vector3 v = plane.Origin - this;
Vector3 normal = plane.ZAxis;
double d = Vector3.DotProduct(v, normal);
return this + d * normal;
}

/// <summary>
/// Calculates the distance of a point to a line.
Expand Down Expand Up @@ -665,6 +678,7 @@ public int InPolygon(Polygon polygon)
}
return inside ? 1 : -1;
}

}
}

0