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GogChartMap

GogChartMap

Synopsis

                    GogChartMap;
                    GogChartMapPolarData;
GogChartMap *       gog_chart_map_new                   (GogChart *chart,
                                                         GogViewAllocation const *area,
                                                         GogAxis *axis0,
                                                         GogAxis *axis1,
                                                         GogAxis *axis2,
                                                         gboolean fill_area);
void                gog_chart_map_free                  (GogChartMap *map);
gboolean            gog_chart_map_is_valid              (GogChartMap *map);
void                gog_chart_map_2D_to_view            (GogChartMap *map,
                                                         double x,
                                                         double y,
                                                         double *u,
                                                         double *v);
double              gog_chart_map_2D_derivative_to_view (GogChartMap *map,
                                                         double deriv,
                                                         double x,
                                                         double y);
void                gog_chart_map_view_to_2D            (GogChartMap *map,
                                                         double x,
                                                         double y,
                                                         double *u,
                                                         double *v);
GogAxisMap *        gog_chart_map_get_axis_map          (GogChartMap *map,
                                                         unsigned int index);
GOPath *            gog_chart_map_make_path             (GogChartMap *map,
                                                         double const *x,
                                                         double const *y,
                                                         int n_points,
                                                         GOLineInterpolation interpolation,
                                                         gboolean skip_invalid,
                                                         gpointer data);
GOPath *            gog_chart_map_make_close_path       (GogChartMap *map,
                                                         double const *x,
                                                         double const *y,
                                                         int n_points,
                                                         GogSeriesFillType fill_type);
GogChartMapPolarData * gog_chart_map_get_polar_parms    (GogChartMap *map);

Description

Details

GogChartMap

typedef struct _GogChartMap GogChartMap;


GogChartMapPolarData

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


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.

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.

gog_chart_map_free ()

void                gog_chart_map_free                  (GogChartMap *map);

Frees map object.

map :

a GogChartMap

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.

map :

a GogChartMap

Returns :

TRUE if map is valid.

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.

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_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.

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_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.

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_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].

map :

a GogChartMap

index :

axis index

Returns :

a GogAxisMap.

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);

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

data :

Returns :

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

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);

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_get_polar_parms ()

GogChartMapPolarData * gog_chart_map_get_polar_parms    (GogChartMap *map);

Convenience function for retrieving data related to polar plot layout.

map :

a GogChartMap

Returns :

a GogChartMapPolarData struct.
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