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GogAxis

GogAxis — An axis.

Types and Values

Object Hierarchy


Description

An axis of a GogPlot. The axis handles things like the bounds, ticks, and tick value formats. When used in plots with X/Y/Z axes, it can optionally have one GogLabel objects in the role "Label".

Functions

gog_axis_add_contributor ()

void
gog_axis_add_contributor (GogAxis *axis,
                          GogObject *contrib);

Register contrib as taking part in the negotiation of axis 's bounds.

Parameters

axis

GogAxis

 

contrib

GogObject (can we relax this to use an interface ?)

 

gog_axis_bound_changed ()

void
gog_axis_bound_changed (GogAxis *axis,
                        GogObject *contrib);

Parameters

axis

GogAxis

 

contrib

GogObject

 

gog_axis_clear_contributors ()

void
gog_axis_clear_contributors (GogAxis *axis);


gog_axis_contributors ()

GSList const *
gog_axis_contributors (GogAxis *axis);

Parameters

axis

GogAxis

 

Returns

the list of the axis contributors.

[element-type GogObject][transfer none]


gog_axis_del_contributor ()

void
gog_axis_del_contributor (GogAxis *axis,
                          GogObject *contrib);

contrib no longer takes part in the negotiation of axis 's bounds.

Parameters

axis

GogAxis

 

contrib

GogObject (can we relax this to use an interface ?)

 

gog_axis_get_atype ()

GogAxisType
gog_axis_get_atype (GogAxis const *axis);

Returns


gog_axis_get_bounds ()

gboolean
gog_axis_get_bounds (GogAxis const *axis,
                     double *minima,
                     double *maxima);

Parameters

axis

GogAxis

 

minima

non-NULL storage for result

 

maxima

non-NULL storage for result

 

Returns

TRUE if the bounds stored in minima and maxima are sane


gog_axis_get_circular_rotation ()

double
gog_axis_get_circular_rotation (GogAxis *axis);

Parameters

axis

a GogAxis

 

Returns

rotation of a circular GogAxis.


gog_axis_get_color_map ()

GogAxisColorMap const *
gog_axis_get_color_map (GogAxis *axis);

Retrieves the GogAxisColorMap associated to the axis or NULL.

Parameters

axis

a GogAxis

 

Returns

the color map used by the axis if any.

[transfer none]


gog_axis_get_color_scale ()

GogColorScale *
gog_axis_get_color_scale (GogAxis *axis);

Retrieves the GogColorScale associated to the axis or NULL.

Parameters

axis

a GogAxis

 

Returns

the color scale used to display the axis colors dor color and pseudo-3d axes.

[transfer none]


gog_axis_get_date_conv ()

const GODateConventions *
gog_axis_get_date_conv (GogAxis const *axis);

Returns


gog_axis_get_effective_format ()

GOFormat *
gog_axis_get_effective_format (GogAxis const *axis);

Parameters

axis

GogAxis

 

Returns

the GOFormat used for the axis labels. Differs from gog_axis_get_format in that it never returns a general format (see go_format_is_general).

[transfer none]


gog_axis_get_effective_span ()

void
gog_axis_get_effective_span (GogAxis const *axis,
                             double *start,
                             double *end);


gog_axis_get_entry ()

double
gog_axis_get_entry (GogAxis const *axis,
                    GogAxisElemType i,
                    gboolean *user_defined);

Parameters

axis

GogAxis

 

user_defined

an optionally NULL pointr to gboolean

 

Returns

the value of axis element i and sets user_defined or NaN on error


gog_axis_get_format ()

GOFormat *
gog_axis_get_format (GogAxis const *axis);

Parameters

axis

GogAxis

 

Returns

the format assigned to axis but does not add a reference.

[transfer none]


gog_axis_get_grid_line ()

GogGridLine *
gog_axis_get_grid_line (GogAxis *axis,
                        gboolean major);

Parameters

axis

GogAxis

 

major

whether to retrieve major or minor grid line.

 

Returns

a pointer to GridLine object associated to given axis, NULL if it doesn't exists.

[transfer none]


gog_axis_get_labels ()

GOData *
gog_axis_get_labels (GogAxis const *axis,
                     GogPlot **plot_that_labeled_axis);

Parameters

axis

a GogAxis

 

plot_that_labeled_axis

a GogPlot

 

Returns

the possibly NULL GOData used as a label for this axis along with the plot that it was associated with.

[transfer none]


gog_axis_get_major_ticks_distance ()

double
gog_axis_get_major_ticks_distance (GogAxis const *axis);

Returns


gog_axis_get_metrics ()

GogAxisMetrics
gog_axis_get_metrics (GogAxis const *axis);

Returns


gog_axis_get_polar_perimeter ()

double
gog_axis_get_polar_perimeter (GogAxis *axis);

Returns


gog_axis_get_polar_unit ()

GogAxisPolarUnit
gog_axis_get_polar_unit (GogAxis *axis);

Parameters

axis

a GogAxis

 

Returns

unit of axis if it's a circular axis of a polar axis set, -1 otherwise.


gog_axis_get_ref_axis ()

GogAxis *
gog_axis_get_ref_axis (GogAxis const *axis);

Parameters

axis

a GogAxis

 

Returns

the axis used to evaluate the length of axis or NULL.

[transfer none]

Since 0.10.17


gog_axis_get_ticks ()

unsigned
gog_axis_get_ticks (GogAxis *axis,
                    GogAxisTick **ticks);

An accessor to axis->ticks .

Parameters

axis

GogAxis

 

ticks

an array of GogAxisTick

 

Returns

number of ticks


gog_axis_is_center_on_ticks ()

gboolean
gog_axis_is_center_on_ticks (GogAxis const *axis);

Parameters

axis

GogAxis

 

Returns

TRUE if labels are centered on ticks when axis is discrete


gog_axis_is_discrete ()

gboolean
gog_axis_is_discrete (GogAxis const *axis);

Parameters

axis

GogAxis

 

Returns

TRUE if axis enumerates a set of discrete items, rather than a continuous value


gog_axis_is_inverted ()

gboolean
gog_axis_is_inverted (GogAxis const *axis);

Parameters

axis

GogAxis

 

Returns

TRUE if axis is inverted.


gog_axis_set_bounds ()

void
gog_axis_set_bounds (GogAxis *axis,
                     double minimum,
                     double maximum);

Sets axis bounds. If minimum or maximum are not finite values, corresponding bound remains unchanged.

Parameters

axis

GogAxis

 

minimum

axis low bound

 

maximum

axis high bound

 

gog_axis_set_extents ()

void
gog_axis_set_extents (GogAxis *axis,
                      double start,
                      double stop);

Set axis exents. It's a convenience function that sets axis bounds taking into account invert flag.

Parameters

axis

GogAxis

 

start

axis start bound

 

stop

axis stop bound

 

gog_axis_set_format ()

gboolean
gog_axis_set_format (GogAxis *axis,
                     GOFormat *fmt);

Absorbs a reference to fmt , and accepts NULL.

Parameters

axis

GogAxis

 

fmt

GOFormat.

[transfer full]

Returns

TRUE if things changed


gog_axis_set_from_str ()

GogAxisSet
gog_axis_set_from_str (char const *str);

Returns


gog_axis_set_polar_unit ()

void
gog_axis_set_polar_unit (GogAxis *axis,
                         GogAxisPolarUnit unit);

Sets unit of a circular axis. See GogAxisPolarUnit for valid values.

Parameters

axis

a GogAxis

 

unit

GogAxisPolarUnit

 

Types and Values

enum GogAxisElemType

The indices of the GOData associated to the axis.

Members

GOG_AXIS_ELEM_MIN

minimum value.

 

GOG_AXIS_ELEM_MAX

maximum value.

 

GOG_AXIS_ELEM_MAJOR_TICK

distance between two major ticks.

 

GOG_AXIS_ELEM_MINOR_TICK

distance between two minor ticks.

 

GOG_AXIS_ELEM_CROSS_POINT

position of the other axis crossing.

 

GOG_AXIS_ELEM_MAX_ENTRY

maximum value, should not occur.

 

enum GogAxisPolarUnit

Members

GOG_AXIS_POLAR_UNIT_DEGREES

units as degrees.

 

GOG_AXIS_POLAR_UNIT_RADIANS

units as radians.

 

GOG_AXIS_POLAR_UNIT_GRADS

units as grads.

 

GOG_AXIS_POLAR_UNIT_MAX

maximum values, should not occur.

 

GogAxisTick

typedef struct {
	double		 position;
	GogAxisTickTypes type;
	GOString        *str;
} GogAxisTick;

Members

double position;

position on the axis.

 

GogAxisTickTypes type;

GogAxisTickTypes

 

GOString *str;

label, might be rich text.

 

enum GogAxisSet

Gives the needed axes for a plot.

Members

GOG_AXIS_SET_UNKNOWN

unkown, should not occur.

 

GOG_AXIS_SET_NONE

no axis.

 

GOG_AXIS_SET_X

only an X axis.

 

GOG_AXIS_SET_XY

both X and Y axes.

 

GOG_AXIS_SET_XY_pseudo_3d

X, Y, and pseudo-3D axes.

 

GOG_AXIS_SET_XY_COLOR

X, Y, and color axes.

 

GOG_AXIS_SET_XY_BUBBLE

X, Y, and bubble axes.

 

GOG_AXIS_SET_XYZ

X, Y, and Z axes.

 

GOG_AXIS_SET_RADAR

circular and radial axes.

 

GOG_AXIS_SET_FUNDAMENTAL

mask for all fundamental axes.

 

GOG_AXIS_SET_ALL

mask for all known axis types.

 

enum GogAxisMetrics

Members

GOG_AXIS_METRICS_INVALID

invalid.

 

GOG_AXIS_METRICS_DEFAULT

default.

 

GOG_AXIS_METRICS_ABSOLUTE

absolute distance between major ticks.

 

GOG_AXIS_METRICS_RELATIVE

relative to another axis.

 

GOG_AXIS_METRICS_RELATIVE_TICKS

relative distance between ticks related to another axis.

 

GOG_AXIS_METRICS_MAX

first unused value.

 

enum GogAxisType

Members

GOG_AXIS_UNKNOWN

invalid, should not occur.

 

GOG_AXIS_X

X axis.

 

GOG_AXIS_Y

Y axis.

 

GOG_AXIS_Z

Z axis.

 

GOG_AXIS_CIRCULAR

circular axis/

 

GOG_AXIS_RADIAL

radial axis.

 

GOG_AXIS_VIRTUAL

start of virtual axes.

 

GOG_AXIS_PSEUDO_3D

pseudo-3d axis.

 

GOG_AXIS_COLOR

color axis.

 

GOG_AXIS_BUBBLE

bubble axis.

 

GOG_AXIS_TYPES

maximum value, should not occur.

 
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