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GogChartMap

GogChartMap

Types and Values

Object Hierarchy

    GBoxed
    ╰── GogChartMap

Description

Functions

gog_chart_map_2D_derivative_to_view ()

double
gog_chart_map_2D_derivative_to_view (GogChartMap *map,
                                     double deriv,
                                     double x,
                                     double y);

Converts a 2D slope from data space to canvas space. It is only implemented for xy maps.

Parameters

map

a GogChartMap

 

deriv

the slope in data space

 

x

data x value

 

y

data y value

 

Returns

the slope in canvas space or go_nan.


gog_chart_map_2D_to_view ()

void
gog_chart_map_2D_to_view (GogChartMap *map,
                          double x,
                          double y,
                          double *u,
                          double *v);

Converts a 2D coordinate from data space to canvas space.

Parameters

map

a GogChartMap

 

x

data x value

 

y

data y value

 

u

placeholder for x converted value

 

v

placeholder for y converted value

 

gog_chart_map_free ()

void
gog_chart_map_free (GogChartMap *map);

Frees map object.

Parameters

map

a GogChartMap

 

gog_chart_map_get_axis_map ()

GogAxisMap *
gog_chart_map_get_axis_map (GogChartMap *map,
                            unsigned int index);

Convenience function which returns one of the associated axis_map.

Valid values are in range [0..2].

Parameters

map

a GogChartMap

 

index

axis index

 

Returns

a GogAxisMap.

[transfer none]


gog_chart_map_get_polar_parms ()

GogChartMapPolarData *
gog_chart_map_get_polar_parms (GogChartMap *map);

Convenience function for retrieving data related to polar plot layout.

Parameters

map

a GogChartMap

 

Returns

a GogChartMapPolarData struct.

[transfer none]


gog_chart_map_is_valid ()

gboolean
gog_chart_map_is_valid (GogChartMap *map);

Tests if map was correctly initializied, i.e. if all associated axis_map are valid (see gog_axis_map_is_valid() ).

given to gog_chart_map_new.

Parameters

map

a GogChartMap

 

Returns

TRUE if map is valid.


gog_chart_map_make_close_path ()

GOPath *
gog_chart_map_make_close_path (GogChartMap *map,
                               double const *x,
                               double const *y,
                               int n_points,
                               GogSeriesFillType fill_type);

Parameters

map

a GogChartMap

 

x

x data

 

y

y data

 

n_points

number of points

 

fill_type

fill type

 

Returns

a new GOPath using x and y data, with respect to fill_type .


gog_chart_map_make_path ()

GOPath *
gog_chart_map_make_path (GogChartMap *map,
                         double const *x,
                         double const *y,
                         int n_points,
                         GOLineInterpolation interpolation,
                         gboolean skip_invalid,
                         gpointer data);

Parameters

map

a GogChartMap

 

x

x data

 

y

y data

 

n_points

number of points

 

interpolation

interpolation type

 

skip_invalid

whether to ignore invalid data or interrupt the interpolation

 

Returns

a new GOPath using x and y data, each valid point being connected with respect to interpolation .


gog_chart_map_new ()

GogChartMap *
gog_chart_map_new (GogChart *chart,
                   GogViewAllocation const *area,
                   GogAxis *axis0,
                   GogAxis *axis1,
                   GogAxis *axis2,
                   gboolean fill_area);

Creates a new GogChartMap, used for conversion from data space to canvas space.

Parameters

chart

a GogChart

 

area

area allocated to chart

 

axis0

1st dimension axis

 

axis1

2nd dimension axis

 

axis2

3rd dimension axis

 

fill_area

does chart fill allocated area

 

Returns

a new GogChartMap object.

[transfer full]


gog_chart_map_view_to_2D ()

void
gog_chart_map_view_to_2D (GogChartMap *map,
                          double x,
                          double y,
                          double *u,
                          double *v);

Converts a 2D coordinate from canvas space to data space.

Parameters

map

a GogChartMap

 

x

data x value

 

y

data y value

 

u

placeholder for x converted value

 

v

placeholder for y converted value

 

Types and Values

GogChartMap

typedef struct _GogChartMap GogChartMap;


GogChartMapPolarData

typedef struct {
	double cx, cy;
	double rx, ry;
	double th0, th1;
} GogChartMapPolarData;

Members

double cx;

center horizontal position.

 

double cy;

center vertical position.

 

double rx;

available horizontal space from the center.

 

double ry;

available vertical space from the center.

 

double th0;

start angle.

 

double th1;

end angle.

 
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