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PointH Structure |
Namespace: Accord.Imaging
Assembly: Accord.Imaging (in Accord.Imaging.dll) Version: 3.8.0
SyntaxThe PointH type exposes the following members.
Constructors| Name | Description | |
|---|---|---|
 | PointH(Double, Double) |
Creates a new point.
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| PointH(Single, Single) |
Creates a new point.
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| PointH(Double, Double, Double) |
Creates a new point.
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| PointH(Single, Single, Single) |
Creates a new point.
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Properties| Name | Description | |
|---|---|---|
 | IsAtInfinity |
Gets whether this point is at infinity (w = 0).
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| IsEmpty |
Gets whether this point is at the origin.
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| IsNormalized |
Gets whether this point is normalized (w = 1).
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| W |
The inverse scaling factor for X and Y.
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| X |
The first coordinate.
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| Y |
The second coordinate.
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Methods| Name | Description | |
|---|---|---|
| Add |
Add the values of two points.
|
 | Ceiling |
Converts to a Integer point by computing the ceiling of the point coordinates.
|
| Equals |
Compares two objects for equality.
(Overrides ValueTypeEquals(Object).) |
| GetHashCode |
Returns the hash code for this instance.
(Overrides ValueTypeGetHashCode.) |
| GetType | Gets the Type of the current instance. (Inherited from Object.) |
| Multiply |
Multiplies the point by a scalar.
|
| Normalize |
Normalizes the point to have unit scale.
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| Round |
Converts to a Integer point by rounding the point coordinates.
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| Subtract |
Subtracts the values of two points.
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| ToArray |
Converts the point to a array representation.
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| ToString | Returns the fully qualified type name of this instance. (Inherited from ValueType.) |
| Transform |
Transforms a point using a projection matrix.
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| Truncate |
Converts to a Integer point by truncating the point coordinates.
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Operators| Name | Description | |
|---|---|---|
 | Addition |
Addition.
|
| Equality |
Equality.
|
| (PointH to PointF) |
PointF Conversion.
|
| Inequality |
Inequality
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| Multiply(Single, PointH) |
Multiplication by scalar.
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| Multiply(PointH, Single) |
Multiplication by scalar.
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| Subtraction |
Subtraction.
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Fields
Extension Methods| Name | Description | |
|---|---|---|
 | HasMethod |
Checks whether an object implements a method with the given name.
(Defined by ExtensionMethods.) |
| IsEqual |
Compares two objects for equality, performing an elementwise
comparison if the elements are vectors or matrices.
(Defined by Matrix.) |
| To(Type) | Overloaded.
Converts an object into another type, irrespective of whether
the conversion can be done at compile time or not. This can be
used to convert generic types to numeric types during runtime.
(Defined by ExtensionMethods.) |
| ToT | Overloaded.
Converts an object into another type, irrespective of whether
the conversion can be done at compile time or not. This can be
used to convert generic types to numeric types during runtime.
(Defined by ExtensionMethods.) |
RemarksIn mathematics, homogeneous coordinates are a system of coordinates used in projective geometry much as Cartesian coordinates are used in Euclidean geometry.
They have the advantage that the coordinates of a point, even those at infinity, can be represented using finite coordinates. Often formulas involving homogeneous coordinates are simpler and more symmetric than their Cartesian counterparts.
Homogeneous coordinates have a range of applications, including computer graphics, where they allow affine transformations and, in general, projective transformations to be easily represented by a matrix.
References:
- http://alumnus.caltech.edu/~woody/docs/3dmatrix.html
- http://simply3d.wordpress.com/2009/05/29/homogeneous-coordinates/
See Also