gimpgradient

## gimpgradient gimpgradient — Functions operating on a single gradient. |

## Synopsis

    gchar*              gimp_gradient_new                   (const gchar *name);
    gchar*              gimp_gradient_duplicate             (const gchar *name);
    gchar*              gimp_gradient_rename                (const gchar *name,
                                                             const gchar *new_name);
    gboolean            gimp_gradient_delete                (const gchar *name);
    gboolean            gimp_gradient_is_editable           (const gchar *name);
    gboolean            gimp_gradient_get_uniform_samples   (const gchar *name,
                                                             gint num_samples,
                                                             gboolean reverse,
                                                             gint *num_color_samples,
                                                             gdouble **color_samples);
    gboolean            gimp_gradient_get_custom_samples    (const gchar *name,
                                                             gint num_samples,
                                                             const gdouble *positions,
                                                             gboolean reverse,
                                                             gint *num_color_samples,
                                                             gdouble **color_samples);
    gint                gimp_gradient_get_number_of_segments
                                                            (const gchar *name);
    gboolean            gimp_gradient_segment_get_left_color
                                                            (const gchar *name,
                                                             gint segment,
                                                             GimpRGB *color,
                                                             gdouble *opacity);
    gboolean            gimp_gradient_segment_set_left_color
                                                            (const gchar *name,
                                                             gint segment,
                                                             const GimpRGB *color,
                                                             gdouble opacity);
    gboolean            gimp_gradient_segment_get_right_color
                                                            (const gchar *name,
                                                             gint segment,
                                                             GimpRGB *color,
                                                             gdouble *opacity);
    gboolean            gimp_gradient_segment_set_right_color
                                                            (const gchar *name,
                                                             gint segment,
                                                             const GimpRGB *color,
                                                             gdouble opacity);
    gboolean            gimp_gradient_segment_get_left_pos  (const gchar *name,
                                                             gint segment,
                                                             gdouble *pos);
    gboolean            gimp_gradient_segment_set_left_pos  (const gchar *name,
                                                             gint segment,
                                                             gdouble pos,
                                                             gdouble *final_pos);
    gboolean            gimp_gradient_segment_get_middle_pos
                                                            (const gchar *name,
                                                             gint segment,
                                                             gdouble *pos);
    gboolean            gimp_gradient_segment_set_middle_pos
                                                            (const gchar *name,
                                                             gint segment,
                                                             gdouble pos,
                                                             gdouble *final_pos);
    gboolean            gimp_gradient_segment_get_right_pos (const gchar *name,
                                                             gint segment,
                                                             gdouble *pos);
    gboolean            gimp_gradient_segment_set_right_pos (const gchar *name,
                                                             gint segment,
                                                             gdouble pos,
                                                             gdouble *final_pos);
    gboolean            gimp_gradient_segment_get_blending_function
                                                            (const gchar *name,
                                                             gint segment,
                                                             GimpGradientSegmentType *blend_func);
    gboolean            gimp_gradient_segment_get_coloring_type
                                                            (const gchar *name,
                                                             gint segment,
                                                             GimpGradientSegmentColor *coloring_type);
    gboolean            gimp_gradient_segment_range_set_blending_function
                                                            (const gchar *name,
                                                             gint start_segment,
                                                             gint end_segment,
                                                             GimpGradientSegmentType blending_function);
    gboolean            gimp_gradient_segment_range_set_coloring_type
                                                            (const gchar *name,
                                                             gint start_segment,
                                                             gint end_segment,
                                                             GimpGradientSegmentColor coloring_type);
    gboolean            gimp_gradient_segment_range_flip    (const gchar *name,
                                                             gint start_segment,
                                                             gint end_segment);
    gboolean            gimp_gradient_segment_range_replicate
                                                            (const gchar *name,
                                                             gint start_segment,
                                                             gint end_segment,
                                                             gint replicate_times);
    gboolean            gimp_gradient_segment_range_split_midpoint
                                                            (const gchar *name,
                                                             gint start_segment,
                                                             gint end_segment);
    gboolean            gimp_gradient_segment_range_split_uniform
                                                            (const gchar *name,
                                                             gint start_segment,
                                                             gint end_segment,
                                                             gint split_parts);
    gboolean            gimp_gradient_segment_range_delete  (const gchar *name,
                                                             gint start_segment,
                                                             gint end_segment);
    gboolean            gimp_gradient_segment_range_redistribute_handles
                                                            (const gchar *name,
                                                             gint start_segment,
                                                             gint end_segment);
    gboolean            gimp_gradient_segment_range_blend_colors
                                                            (const gchar *name,
                                                             gint start_segment,
                                                             gint end_segment);
    gboolean            gimp_gradient_segment_range_blend_opacity
                                                            (const gchar *name,
                                                             gint start_segment,
                                                             gint end_segment);
    gdouble             gimp_gradient_segment_range_move    (const gchar *name,
                                                             gint start_segment,
                                                             gint end_segment,
                                                             gdouble delta,
                                                             gboolean control_compress);

## Description

Functions operating on a single gradient.

## Details

### gimp_gradient_new ()

    gchar*              gimp_gradient_new                   (const gchar *name);

Creates a new gradient

This procedure creates a new, uninitialized gradient

`name` : | The requested name of the new gradient.
Returns : | The actual new gradient name.

Since GIMP 2.2

### gimp_gradient_duplicate ()

    gchar*              gimp_gradient_duplicate             (const gchar *name);

Duplicates a gradient

This procedure creates an identical gradient by a different name

`name` : | The gradient name.
Returns : | The name of the gradient's copy.

Since GIMP 2.2

### gimp_gradient_rename ()

    gchar*              gimp_gradient_rename                (const gchar *name,
                                                             const gchar *new_name);

Rename a gradient

This procedure renames a gradient

`name` : | The gradient name.
`new_name` : | The new name of the gradient.
Returns : | The actual new name of the gradient.

Since GIMP 2.2

### gimp_gradient_delete ()

    gboolean            gimp_gradient_delete                (const gchar *name);

Deletes a gradient

This procedure deletes a gradient

`name` : | The gradient name.
Returns : | TRUE on success.

Since GIMP 2.2

### gimp_gradient_is_editable ()

    gboolean            gimp_gradient_is_editable           (const gchar *name);

Tests if gradient can be edited

Returns TRUE if you have permission to change the gradient

`name` : | The gradient name.
Returns : | TRUE if the gradient can be edited.

Since GIMP 2.4

### gimp_gradient_get_uniform_samples ()

    gboolean            gimp_gradient_get_uniform_samples   (const gchar *name,
                                                             gint num_samples,
                                                             gboolean reverse,
                                                             gint *num_color_samples,
                                                             gdouble **color_samples);

Sample the specified in uniform parts.

This procedure samples the active gradient in the specified number of uniform parts. It returns a list of floating-point values which correspond to the RGBA values for each sample. The minimum number of samples to take is 2, in which case the returned colors will correspond to the { 0.0, 1.0 } positions in the gradient. For example, if the number of samples is 3, the procedure will return the colors at positions { 0.0, 0.5, 1.0 }.

`name` : | The gradient name.
`num_samples` : | The number of samples to take.
`reverse` : | Use the reverse gradient.
`num_color_samples` : | Length of the color_samples array (4 * num_samples).
`color_samples` : | Color samples: { R1, G1, B1, A1, ..., Rn, Gn, Bn, An }.
Returns : | TRUE on success.

Since GIMP 2.2

### gimp_gradient_get_custom_samples ()

    gboolean            gimp_gradient_get_custom_samples    (const gchar *name,
                                                             gint num_samples,
                                                             const gdouble *positions,
                                                             gboolean reverse,
                                                             gint *num_color_samples,
                                                             gdouble **color_samples);

Sample the spacified gradient in custom positions.

This procedure samples the active gradient in the specified number of points. The procedure will sample the gradient in the specified positions from the list. The left endpoint of the gradient corresponds to position 0.0, and the right endpoint corresponds to 1.0. The procedure returns a list of floating-point values which correspond to the RGBA values for each sample.

`name` : | The gradient name.
`num_samples` : | The number of samples to take.
`positions` : | The list of positions to sample along the gradient.
`reverse` : | Use the reverse gradient.
`num_color_samples` : | Length of the color_samples array (4 * num_samples).
`color_samples` : | Color samples: { R1, G1, B1, A1, ..., Rn, Gn, Bn, An }.
Returns : | TRUE on success.

Since GIMP 2.2

### gimp_gradient_get_number_of_segments ()

    gint                gimp_gradient_get_number_of_segments
                                                            (const gchar *name);

Returns the number of segments of the specified gradient

This procedure returns the number of segments of the specified gradient.

`name` : | The gradient name.
Returns : | Number of segments.

Since GIMP 2.6

### gimp_gradient_segment_get_left_color ()

    gboolean            gimp_gradient_segment_get_left_color
                                                            (const gchar *name,
                                                             gint segment,
                                                             GimpRGB *color,
                                                             gdouble *opacity);

Retrieves the left endpoint color of the specified segment

This procedure retrieves the left endpoint color of the specified segment of the specified gradient.

`name` : | The gradient name.
`segment` : | The index of the segment within the gradient.
`color` : | The return color.
`opacity` : | The opacity of the endpoint.
Returns : | TRUE on success.

Since GIMP 2.2

### gimp_gradient_segment_set_left_color ()

    gboolean            gimp_gradient_segment_set_left_color
                                                            (const gchar *name,
                                                             gint segment,
                                                             const GimpRGB *color,
                                                             gdouble opacity);

Sets the left endpoint color of the specified segment

This procedure sets the left endpoint color of the specified segment of the specified gradient.

`name` : | The gradient name.
`segment` : | The index of the segment within the gradient.
`color` : | The color to set.
`opacity` : | The opacity to set for the endpoint.
Returns : | TRUE on success.

Since GIMP 2.2

### gimp_gradient_segment_get_right_color ()

    gboolean            gimp_gradient_segment_get_right_color
                                                            (const gchar *name,
                                                             gint segment,
                                                             GimpRGB *color,
                                                             gdouble *opacity);

Retrieves the right endpoint color of the specified segment

This procedure retrieves the right endpoint color of the specified segment of the specified gradient.

`name` : | The gradient name.
`segment` : | The index of the segment within the gradient.
`color` : | The return color.
`opacity` : | The opacity of the endpoint.
Returns : | TRUE on success.

Since GIMP 2.2

### gimp_gradient_segment_set_right_color ()

    gboolean            gimp_gradient_segment_set_right_color
                                                            (const gchar *name,
                                                             gint segment,
                                                             const GimpRGB *color,
                                                             gdouble opacity);

Sets the right endpoint color of the specified segment

This procedure sets the right endpoint color of the specified segment of the specified gradient.

`name` : | The gradient name.
`segment` : | The index of the segment within the gradient.
`color` : | The color to set.
`opacity` : | The opacity to set for the endpoint.
Returns : | TRUE on success.

Since GIMP 2.2

### gimp_gradient_segment_get_left_pos ()

    gboolean            gimp_gradient_segment_get_left_pos  (const gchar *name,
                                                             gint segment,
                                                             gdouble *pos);

Retrieves the left endpoint position of the specified segment

This procedure retrieves the left endpoint position of the specified segment of the specified gradient.

`name` : | The gradient name.
`segment` : | The index of the segment within the gradient.
`pos` : | The return position.
Returns : | TRUE on success.

Since GIMP 2.2

### gimp_gradient_segment_set_left_pos ()

    gboolean            gimp_gradient_segment_set_left_pos  (const gchar *name,
                                                             gint segment,
                                                             gdouble pos,
                                                             gdouble *final_pos);

Sets the left endpoint position of the specified segment

This procedure sets the left endpoint position of the specified segment of the specified gradient. The final position will be between the position of the middle point to the left to the middle point of the current segement. This procedure returns the final position.

`name` : | The gradient name.
`segment` : | The index of the segment within the gradient.
`pos` : | The position to set the guidepoint to.
`final_pos` : | The return position.
Returns : | TRUE on success.

Since GIMP 2.2

### gimp_gradient_segment_get_middle_pos ()

    gboolean            gimp_gradient_segment_get_middle_pos
                                                            (const gchar *name,
                                                             gint segment,
                                                             gdouble *pos);

Retrieves the middle point position of the specified segment

This procedure retrieves the middle point position of the specified segment of the specified gradient.

`name` : | The gradient name.
`segment` : | The index of the segment within the gradient.
`pos` : | The return position.
Returns : | TRUE on success.

Since GIMP 2.2

### gimp_gradient_segment_set_middle_pos ()

    gboolean            gimp_gradient_segment_set_middle_pos
                                                            (const gchar *name,
                                                             gint segment,
                                                             gdouble pos,
                                                             gdouble *final_pos);

Sets the middle point position of the specified segment

This procedure sets the middle point position of the specified segment of the specified gradient. The final position will be between the two endpoints of the segment. This procedure returns the final position.

`name` : | The gradient name.
`segment` : | The index of the segment within the gradient.
`pos` : | The position to set the guidepoint to.
`final_pos` : | The return position.
Returns : | TRUE on success.

Since GIMP 2.2

### gimp_gradient_segment_get_right_pos ()

    gboolean            gimp_gradient_segment_get_right_pos (const gchar *name,
                                                             gint segment,
                                                             gdouble *pos);

Retrieves the right endpoint position of the specified segment

This procedure retrieves the right endpoint position of the specified segment of the specified gradient.

`name` : | The gradient name.
`segment` : | The index of the segment within the gradient.
`pos` : | The return position.
Returns : | TRUE on success.

Since GIMP 2.2

### gimp_gradient_segment_set_right_pos ()

    gboolean            gimp_gradient_segment_set_right_pos (const gchar *name,
                                                             gint segment,
                                                             gdouble pos,
                                                             gdouble *final_pos);

Sets the right endpoint position of the specified segment

This procedure sets the right endpoint position of the specified segment of the specified gradient. The final position will be between the position of the middle point of the current segment and the middle point of the segment to the right. This procedure returns the final position.

`name` : | The gradient name.
`segment` : | The index of the segment within the gradient.
`pos` : | The position to set the guidepoint to.
`final_pos` : | The return position.
Returns : | TRUE on success.

Since GIMP 2.2

### gimp_gradient_segment_get_blending_function ()

    gboolean            gimp_gradient_segment_get_blending_function
                                                            (const gchar *name,
                                                             gint segment,
                                                             GimpGradientSegmentType *blend_func);

Retrieves the gradient segment's blending function

This procedure retrieves the blending function of the segment at the specified gradient name and segment index.

`name` : | The gradient name.
`segment` : | The index of the segment within the gradient.
`blend_func` : | The blending function of the segment.
Returns : | TRUE on success.

Since GIMP 2.2

### gimp_gradient_segment_get_coloring_type ()

    gboolean            gimp_gradient_segment_get_coloring_type
                                                            (const gchar *name,
                                                             gint segment,
                                                             GimpGradientSegmentColor *coloring_type);

Retrieves the gradient segment's coloring type

This procedure retrieves the coloring type of the segment at the specified gradient name and segment index.

`name` : | The gradient name.
`segment` : | The index of the segment within the gradient.
`coloring_type` : | The coloring type of the segment.
Returns : | TRUE on success.

Since GIMP 2.2

### gimp_gradient_segment_range_set_blending_function ()

    gboolean            gimp_gradient_segment_range_set_blending_function
                                                            (const gchar *name,
                                                             gint start_segment,
                                                             gint end_segment,
                                                             GimpGradientSegmentType blending_function);

Change the blending function of a segments range

This function changes the blending function of a segment range to the specified blending function.

`name` : | The gradient name.
`start_segment` : | The index of the first segment to operate on.
`end_segment` : | The index of the last segment to operate on. If negative, the selection will extend to the end of the string.
`blending_function` : | The blending function.
Returns : | TRUE on success.

Since GIMP 2.2

### gimp_gradient_segment_range_set_coloring_type ()

    gboolean            gimp_gradient_segment_range_set_coloring_type
                                                            (const gchar *name,
                                                             gint start_segment,
                                                             gint end_segment,
                                                             GimpGradientSegmentColor coloring_type);

Change the coloring type of a segments range

This function changes the coloring type of a segment range to the specified coloring type.

`name` : | The gradient name.
`start_segment` : | The index of the first segment to operate on.
`end_segment` : | The index of the last segment to operate on. If negative, the selection will extend to the end of the string.
`coloring_type` : | The coloring type.
Returns : | TRUE on success.

Since GIMP 2.2

### gimp_gradient_segment_range_flip ()

    gboolean            gimp_gradient_segment_range_flip    (const gchar *name,
                                                             gint start_segment,
                                                             gint end_segment);

Flip the segment range

This function flips a segment range.

`name` : | The gradient name.
`start_segment` : | The index of the first segment to operate on.
`end_segment` : | The index of the last segment to operate on. If negative, the selection will extend to the end of the string.
Returns : | TRUE on success.

Since GIMP 2.2

### gimp_gradient_segment_range_replicate ()

    gboolean            gimp_gradient_segment_range_replicate
                                                            (const gchar *name,
                                                             gint start_segment,
                                                             gint end_segment,
                                                             gint replicate_times);

Replicate the segment range

This function replicates a segment range a given number of times. Instead of the original segment range, several smaller scaled copies of it will appear in equal widths.

`name` : | The gradient name.
`start_segment` : | The index of the first segment to operate on.
`end_segment` : | The index of the last segment to operate on. If negative, the selection will extend to the end of the string.
`replicate_times` : | The number of times to replicate.
Returns : | TRUE on success.

Since GIMP 2.2

### gimp_gradient_segment_range_split_midpoint ()

    gboolean            gimp_gradient_segment_range_split_midpoint
                                                            (const gchar *name,
                                                             gint start_segment,
                                                             gint end_segment);

Splits each segment in the segment range at midpoint

This function splits each segment in the segment range at its midpoint.

`name` : | The gradient name.
`start_segment` : | The index of the first segment to operate on.
`end_segment` : | The index of the last segment to operate on. If negative, the selection will extend to the end of the string.
Returns : | TRUE on success.

Since GIMP 2.2

### gimp_gradient_segment_range_split_uniform ()

    gboolean            gimp_gradient_segment_range_split_uniform
                                                            (const gchar *name,
                                                             gint start_segment,
                                                             gint end_segment,
                                                             gint split_parts);

Splits each segment in the segment range uniformly

This function splits each segment in the segment range uniformly according to the number of times specified by the parameter.

`name` : | The gradient name.
`start_segment` : | The index of the first segment to operate on.
`end_segment` : | The index of the last segment to operate on. If negative, the selection will extend to the end of the string.
`split_parts` : | The number of uniform divisions to split each segment to.
Returns : | TRUE on success.

Since GIMP 2.2

### gimp_gradient_segment_range_delete ()

    gboolean            gimp_gradient_segment_range_delete  (const gchar *name,
                                                             gint start_segment,
                                                             gint end_segment);

Delete the segment range

This function deletes a segment range.

`name` : | The gradient name.
`start_segment` : | The index of the first segment to operate on.
`end_segment` : | The index of the last segment to operate on. If negative, the selection will extend to the end of the string.
Returns : | TRUE on success.

Since GIMP 2.2

### gimp_gradient_segment_range_redistribute_handles ()

    gboolean            gimp_gradient_segment_range_redistribute_handles
                                                            (const gchar *name,
                                                             gint start_segment,
                                                             gint end_segment);

Uniformly redistribute the segment range's handles

This function redistributes the handles of the specified segment range of the specified gradient, so they'll be evenly spaced.

`name` : | The gradient name.
`start_segment` : | The index of the first segment to operate on.
`end_segment` : | The index of the last segment to operate on. If negative, the selection will extend to the end of the string.
Returns : | TRUE on success.

Since GIMP 2.2

### gimp_gradient_segment_range_blend_colors ()

    gboolean            gimp_gradient_segment_range_blend_colors
                                                            (const gchar *name,
                                                             gint start_segment,
                                                             gint end_segment);

Blend the colors of the segment range.

This function blends the colors (but not the opacity) of the segments' range of the gradient. Using it, the colors' transition will be uniform across the range.

`name` : | The gradient name.
`start_segment` : | The index of the first segment to operate on.
`end_segment` : | The index of the last segment to operate on. If negative, the selection will extend to the end of the string.
Returns : | TRUE on success.

Since GIMP 2.2

### gimp_gradient_segment_range_blend_opacity ()

    gboolean            gimp_gradient_segment_range_blend_opacity
                                                            (const gchar *name,
                                                             gint start_segment,
                                                             gint end_segment);

Blend the opacity of the segment range.

This function blends the opacity (but not the colors) of the segments' range of the gradient. Using it, the opacity's transition will be uniform across the range.

`name` : | The gradient name.
`start_segment` : | The index of the first segment to operate on.
`end_segment` : | The index of the last segment to operate on. If negative, the selection will extend to the end of the string.
Returns : | TRUE on success.

Since GIMP 2.2

### gimp_gradient_segment_range_move ()

    gdouble             gimp_gradient_segment_range_move    (const gchar *name,
                                                             gint start_segment,
                                                             gint end_segment,
                                                             gdouble delta,
                                                             gboolean control_compress);

Move the position of an entire segment range by a delta.

This funtions moves the position of an entire segment range by a delta. The actual delta (which is returned) will be limited by the control points of the neighboring segments.

`name` : | The gradient name.
`start_segment` : | The index of the first segment to operate on.
`end_segment` : | The index of the last segment to operate on. If negative, the selection will extend to the end of the string.
`delta` : | The delta to move the segment range.
`control_compress` : | Whether or not to compress the neighboring segments.
Returns : | The final delta by which the range moved.

Since GIMP 2.2