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Functions
Functions
gimp_vector2_new ()
GimpVector2 gimp_vector2_new (gdouble x
,gdouble y
);
Creates a GimpVector2 of coordinates x
and y
.
gimp_vector2_set ()
void gimp_vector2_set (GimpVector2 *vector
,gdouble x
,gdouble y
);
Sets the X and Y coordinates of vector
to x
and y
.
gimp_vector2_length ()
gdouble
gimp_vector2_length (const GimpVector2 *vector
);
Computes the length of a 2D vector.
gimp_vector2_length_val ()
gdouble
gimp_vector2_length_val (GimpVector2 vector
);
This function is identical to gimp_vector2_length()
but the
vector is passed by value rather than by reference.
gimp_vector2_mul ()
void gimp_vector2_mul (GimpVector2 *vector
,gdouble factor
);
Multiplies each component of the vector
by factor
. Note that this
is equivalent to multiplying the vectors length by factor
.
gimp_vector2_mul_val ()
GimpVector2 gimp_vector2_mul_val (GimpVector2 vector
,gdouble factor
);
This function is identical to gimp_vector2_mul()
but the vector is
passed by value rather than by reference.
gimp_vector2_normal ()
GimpVector2
gimp_vector2_normal (GimpVector2 *vector
);
Compute a normalized perpendicular vector to vector
Since: 2.8
gimp_vector2_normal_val ()
GimpVector2
gimp_vector2_normal_val (GimpVector2 vector
);
This function is identical to gimp_vector2_normal()
but the vector
is passed by value rather than by reference.
Since: 2.8
gimp_vector2_normalize ()
void
gimp_vector2_normalize (GimpVector2 *vector
);
Normalizes the vector
so the length of the vector
is 1.0. The nul
vector will not be changed.
gimp_vector2_normalize_val ()
GimpVector2
gimp_vector2_normalize_val (GimpVector2 vector
);
This function is identical to gimp_vector2_normalize()
but the
vector is passed by value rather than by reference.
gimp_vector2_neg ()
void
gimp_vector2_neg (GimpVector2 *vector
);
Negates the vector
(i.e. negate all its coordinates).
gimp_vector2_neg_val ()
GimpVector2
gimp_vector2_neg_val (GimpVector2 vector
);
This function is identical to gimp_vector2_neg()
but the vector
is passed by value rather than by reference.
gimp_vector2_add ()
void gimp_vector2_add (GimpVector2 *result
,const GimpVector2 *vector1
,const GimpVector2 *vector2
);
Computes the sum of two 2D vectors. The resulting GimpVector2 is
stored in result
.
Parameters
result |
destination for the resulting GimpVector2. |
|
vector1 |
a pointer to the first GimpVector2. |
|
vector2 |
a pointer to the second GimpVector2. |
gimp_vector2_add_val ()
GimpVector2 gimp_vector2_add_val (GimpVector2 vector1
,GimpVector2 vector2
);
This function is identical to gimp_vector2_add()
but the vectors
are passed by value rather than by reference.
gimp_vector2_sub ()
void gimp_vector2_sub (GimpVector2 *result
,const GimpVector2 *vector1
,const GimpVector2 *vector2
);
Computes the difference of two 2D vectors (vector1
minus vector2
).
The resulting GimpVector2 is stored in result
.
Parameters
result |
the destination for the resulting GimpVector2. |
|
vector1 |
a pointer to the first GimpVector2. |
|
vector2 |
a pointer to the second GimpVector2. |
gimp_vector2_sub_val ()
GimpVector2 gimp_vector2_sub_val (GimpVector2 vector1
,GimpVector2 vector2
);
This function is identical to gimp_vector2_sub()
but the vectors
are passed by value rather than by reference.
gimp_vector2_inner_product ()
gdouble gimp_vector2_inner_product (const GimpVector2 *vector1
,const GimpVector2 *vector2
);
Computes the inner (dot) product of two 2D vectors. This product is zero if and only if the two vectors are orthogonal.
gimp_vector2_inner_product_val ()
gdouble gimp_vector2_inner_product_val (GimpVector2 vector1
,GimpVector2 vector2
);
This function is identical to gimp_vector2_inner_product()
but the
vectors are passed by value rather than by reference.
gimp_vector2_cross_product ()
GimpVector2 gimp_vector2_cross_product (const GimpVector2 *vector1
,const GimpVector2 *vector2
);
Compute the cross product of two vectors. The result is a
GimpVector2 which is orthogonal to both vector1
and vector2
. If
vector1
and vector2
are parallel, the result will be the nul
vector.
Note that in 2D, this function is useful to test if two vectors are parallel or not, or to compute the area spawned by two vectors.
gimp_vector2_cross_product_val ()
GimpVector2 gimp_vector2_cross_product_val (GimpVector2 vector1
,GimpVector2 vector2
);
This function is identical to gimp_vector2_cross_product()
but the
vectors are passed by value rather than by reference.
gimp_vector2_rotate ()
void gimp_vector2_rotate (GimpVector2 *vector
,gdouble alpha
);
Rotates the vector
counterclockwise by alpha
radians.
gimp_vector2_rotate_val ()
GimpVector2 gimp_vector2_rotate_val (GimpVector2 vector
,gdouble alpha
);
This function is identical to gimp_vector2_rotate()
but the vector
is passed by value rather than by reference.
gimp_vector3_new ()
GimpVector3 gimp_vector3_new (gdouble x
,gdouble y
,gdouble z
);
Creates a GimpVector3 of coordinate x
, y
and z
.
gimp_vector3_set ()
void gimp_vector3_set (GimpVector3 *vector
,gdouble x
,gdouble y
,gdouble z
);
Sets the X, Y and Z coordinates of vector
to x
, y
and z
.
Parameters
vector |
a pointer to a GimpVector3. |
|
x |
the X coordinate. |
|
y |
the Y coordinate. |
|
z |
the Z coordinate. |
gimp_vector3_length ()
gdouble
gimp_vector3_length (const GimpVector3 *vector
);
Computes the length of a 3D vector.
gimp_vector3_length_val ()
gdouble
gimp_vector3_length_val (GimpVector3 vector
);
This function is identical to gimp_vector3_length()
but the vector
is passed by value rather than by reference.
gimp_vector3_mul ()
void gimp_vector3_mul (GimpVector3 *vector
,gdouble factor
);
Multiplies each component of the vector
by factor
. Note that
this is equivalent to multiplying the vectors length by factor
.
gimp_vector3_mul_val ()
GimpVector3 gimp_vector3_mul_val (GimpVector3 vector
,gdouble factor
);
This function is identical to gimp_vector3_mul()
but the vector is
passed by value rather than by reference.
gimp_vector3_normalize ()
void
gimp_vector3_normalize (GimpVector3 *vector
);
Normalizes the vector
so the length of the vector
is 1.0. The nul
vector will not be changed.
gimp_vector3_normalize_val ()
GimpVector3
gimp_vector3_normalize_val (GimpVector3 vector
);
This function is identical to gimp_vector3_normalize()
but the
vector is passed by value rather than by reference.
gimp_vector3_neg ()
void
gimp_vector3_neg (GimpVector3 *vector
);
Negates the vector
(i.e. negate all its coordinates).
gimp_vector3_neg_val ()
GimpVector3
gimp_vector3_neg_val (GimpVector3 vector
);
This function is identical to gimp_vector3_neg()
but the vector
is passed by value rather than by reference.
gimp_vector3_add ()
void gimp_vector3_add (GimpVector3 *result
,const GimpVector3 *vector1
,const GimpVector3 *vector2
);
Computes the sum of two 3D vectors. The resulting GimpVector3 is
stored in result
.
Parameters
result |
destination for the resulting GimpVector3. |
|
vector1 |
a pointer to the first GimpVector3. |
|
vector2 |
a pointer to the second GimpVector3. |
gimp_vector3_add_val ()
GimpVector3 gimp_vector3_add_val (GimpVector3 vector1
,GimpVector3 vector2
);
This function is identical to gimp_vector3_add()
but the vectors
are passed by value rather than by reference.
gimp_vector3_sub ()
void gimp_vector3_sub (GimpVector3 *result
,const GimpVector3 *vector1
,const GimpVector3 *vector2
);
Computes the difference of two 3D vectors (vector1
minus vector2
).
The resulting GimpVector3 is stored in result
.
Parameters
result |
the destination for the resulting GimpVector3. |
|
vector1 |
a pointer to the first GimpVector3. |
|
vector2 |
a pointer to the second GimpVector3. |
gimp_vector3_sub_val ()
GimpVector3 gimp_vector3_sub_val (GimpVector3 vector1
,GimpVector3 vector2
);
This function is identical to gimp_vector3_sub()
but the vectors
are passed by value rather than by reference.
gimp_vector3_inner_product ()
gdouble gimp_vector3_inner_product (const GimpVector3 *vector1
,const GimpVector3 *vector2
);
Computes the inner (dot) product of two 3D vectors. This product is zero if and only if the two vectors are orthogonal.
gimp_vector3_inner_product_val ()
gdouble gimp_vector3_inner_product_val (GimpVector3 vector1
,GimpVector3 vector2
);
This function is identical to gimp_vector3_inner_product()
but the
vectors are passed by value rather than by reference.
gimp_vector3_cross_product ()
GimpVector3 gimp_vector3_cross_product (const GimpVector3 *vector1
,const GimpVector3 *vector2
);
Compute the cross product of two vectors. The result is a
GimpVector3 which is orthogonal to both vector1
and vector2
. If
vector1
and vector2
and parallel, the result will be the nul
vector.
This function can be used to compute the normal of the plane
defined by vector1
and vector2
.
gimp_vector3_cross_product_val ()
GimpVector3 gimp_vector3_cross_product_val (GimpVector3 vector1
,GimpVector3 vector2
);
This function is identical to gimp_vector3_cross_product()
but the
vectors are passed by value rather than by reference.
gimp_vector3_rotate ()
void gimp_vector3_rotate (GimpVector3 *vector
,gdouble alpha
,gdouble beta
,gdouble gamma
);
Rotates the vector
around the three axis (Z, Y, and X) by alpha
,
beta
and gamma
, respectively.
Note that the order of the rotation is very important. If you
expect a vector to be rotated around X, and then around Y, you will
have to call this function twice. Also, it is often wise to call
this function with only one of alpha
, beta
and gamma
non-zero.
Parameters
vector |
a pointer to a GimpVector3. |
|
alpha |
the angle (in radian) of rotation around the Z axis. |
|
beta |
the angle (in radian) of rotation around the Y axis. |
|
gamma |
the angle (in radian) of rotation around the X axis. |
gimp_vector3_rotate_val ()
GimpVector3 gimp_vector3_rotate_val (GimpVector3 vector
,gdouble alpha
,gdouble beta
,gdouble gamma
);
This function is identical to gimp_vector3_rotate()
but the vectors
are passed by value rather than by reference.
Parameters
vector |
a GimpVector3. |
|
alpha |
the angle (in radian) of rotation around the Z axis. |
|
beta |
the angle (in radian) of rotation around the Y axis. |
|
gamma |
the angle (in radian) of rotation around the X axis. |
gimp_vector_2d_to_3d ()
void gimp_vector_2d_to_3d (gint sx
,gint sy
,gint w
,gint h
,gint x
,gint y
,const GimpVector3 *vp
,GimpVector3 *p
);
\"Compute screen (sx, sy) - (sx + w, sy + h) to 3D unit square mapping. The plane to map to is given in the z field of p. The observer is located at position vp (vp->z != 0.0).\"
In other words, this computes the projection of the point (x
, y
)
to the plane z = p->z
(parallel to XY), from the vp
point of view
through the screen (sx
, sy
)->(sx
+ w
, sy
+ h
)
Parameters
sx |
the abscissa of the upper-left screen rectangle. |
|
sy |
the ordinate of the upper-left screen rectangle. |
|
w |
the width of the screen rectangle. |
|
h |
the height of the screen rectangle. |
|
x |
the abscissa of the point in the screen rectangle to map. |
|
y |
the ordinate of the point in the screen rectangle to map. |
|
vp |
the position of the observer. |
|
p |
the resulting point. |
gimp_vector_2d_to_3d_val ()
GimpVector3 gimp_vector_2d_to_3d_val (gint sx
,gint sy
,gint w
,gint h
,gint x
,gint y
,GimpVector3 vp
,GimpVector3 p
);
This function is identical to gimp_vector_2d_to_3d()
but the
position of the observer
and the resulting point p
are passed by
value rather than by reference.
Parameters
sx |
the abscissa of the upper-left screen rectangle. |
|
sy |
the ordinate of the upper-left screen rectangle. |
|
w |
the width of the screen rectangle. |
|
h |
the height of the screen rectangle. |
|
x |
the abscissa of the point in the screen rectangle to map. |
|
y |
the ordinate of the point in the screen rectangle to map. |
|
vp |
position of the observer. |
|
p |
the resulting point. |
gimp_vector_3d_to_2d ()
void gimp_vector_3d_to_2d (gint sx
,gint sy
,gint w
,gint h
,gdouble *x
,gdouble *y
,const GimpVector3 *vp
,const GimpVector3 *p
);
Convert the given 3D point to 2D (project it onto the viewing plane, (sx, sy, 0) - (sx + w, sy + h, 0). The input is assumed to be in the unit square (0, 0, z) - (1, 1, z). The viewpoint of the observer is passed in vp.
This is basically the opposite of gimp_vector_2d_to_3d()
.
Parameters
sx |
the abscissa of the upper-left screen rectangle. |
|
sy |
the ordinate of the upper-left screen rectangle. |
|
w |
the width of the screen rectangle. |
|
h |
the height of the screen rectangle. |
|
x |
the abscissa of the point in the screen rectangle to map (return value). |
|
y |
the ordinate of the point in the screen rectangle to map (return value). |
|
vp |
position of the observer. |
|
p |
the 3D point to project to the plane. |