GwyGraphBasics

GwyGraphBasics — Common graph functions and utilities

Functions

void	gwy_graph_draw_point ()
void	gwy_graph_draw_line ()
void	gwy_graph_draw_curve ()
void	gwy_graph_draw_selection_points ()
void	gwy_graph_draw_selection_areas ()
void	gwy_graph_draw_selection_lines ()
void	gwy_graph_draw_selection_xareas ()
void	gwy_graph_draw_selection_yareas ()
void	gwy_graph_draw_grid ()
const GwyRGBA *	gwy_graph_get_preset_color ()
guint	gwy_graph_get_n_preset_colors ()

Types and Values

GwyGraphActiveAreaSpecs

Includes

#include <libgwydgets/gwydgets.h>

Description

Functions

gwy_graph_draw_point ()

void
gwy_graph_draw_point (GdkDrawable *drawable,
                      GdkGC *gc,
                      gint x,
                      gint y,
                      GwyGraphPointType type,
                      gint size,
                      const GwyRGBA *color);

Draws a point on a drawable.

Parameters

drawable	A drawable.
gc	Graphics context. It is modified by this function unpredictably.
x	X coordinate of the point.
y	Y coordinate of the point.
type	graph point type
size	point size
color	point color

gwy_graph_draw_line ()

void
gwy_graph_draw_line (GdkDrawable *drawable,
                     GdkGC *gc,
                     gint x_from,
                     gint y_from,
                     gint x_to,
                     gint y_to,
                     GdkLineStyle line_style,
                     gint size,
                     const GwyRGBA *color);

Draws a line segment on a drawable.

Parameters

drawable	A drawable.
gc	Graphics context. It is modified by this function unpredictably.
x_from	x coordinate of the start point of the line
y_from	y coordinate of the start point of the line
x_to	x coordinate of the end point of the line
y_to	y coordinate of the end point of the line
line_style	graph line style
size	point size
color	point color

gwy_graph_draw_curve ()

void
gwy_graph_draw_curve (GdkDrawable *drawable,
                      GdkGC *gc,
                      GwyGraphActiveAreaSpecs *specs,
                      GwyGraphCurveModel *gcmodel);

Draws a single graph curve on a drawable.

Parameters

drawable	A drawable.
gc	Graphics context. It is modified by this function unpredictably.
specs	Specifications (boundaries) of the active area of the graph.
gcmodel	Curve model of the curve to draw.

gwy_graph_draw_selection_points ()

void
gwy_graph_draw_selection_points (GdkDrawable *drawable,
                                 GdkGC *gc,
                                 GwyGraphActiveAreaSpecs *specs,
                                 GwySelectionGraphPoint *selection);

Draws selection points on a drawable.

Parameters

drawable	A drawable.
gc	Graphics context.
specs	Specifications (boundaries) of the active area of the graph.
selection	A selection of type GwySelectionGraphPoint.

gwy_graph_draw_selection_areas ()

void
gwy_graph_draw_selection_areas (GdkDrawable *drawable,
                                GdkGC *gc,
                                GwyGraphActiveAreaSpecs *specs,
                                GwySelectionGraphArea *selection);

Draws selected area on a drawable.

Parameters

drawable	A drawable.
gc	Graphics context. It is modified by this function unpredictably.
specs	Specifications (boundaries) of the active area of the graph.
selection	A selection of type GwySelectionGraphArea.

gwy_graph_draw_selection_lines ()

void
gwy_graph_draw_selection_lines (GdkDrawable *drawable,
                                GdkGC *gc,
                                GwyGraphActiveAreaSpecs *specs,
                                GwySelectionGraphLine *selection,
                                GtkOrientation orientation);

Draws selected lines on a drawable.

Parameters

drawable	A drawable.
gc	Graphics context. It is modified by this function unpredictably.
specs	Specifications (boundaries) of the active area of the graph.
selection	a GwySelectionGraphLine structure
orientation	horizontal or vertical orientation

gwy_graph_draw_selection_xareas ()

void
gwy_graph_draw_selection_xareas (GdkDrawable *drawable,
                                 GdkGC *gc,
                                 GwyGraphActiveAreaSpecs *specs,
                                 GwySelectionGraph1DArea *selection);

Draws selected x-area on a drawable.

Parameters

drawable	A drawable.
gc	Graphics context. It is modified by this function unpredictably.
specs	Specifications (boundaries) of the active area of the graph.
selection	A selection of type GwySelectionGraph1DArea.

gwy_graph_draw_selection_yareas ()

void
gwy_graph_draw_selection_yareas (GdkDrawable *drawable,
                                 GdkGC *gc,
                                 GwyGraphActiveAreaSpecs *specs,
                                 GwySelectionGraph1DArea *selection);

Drawss selected y-area on a drawable.

Parameters

drawable	A drawable.
gc	Graphics context. It is modified by this function unpredictably.
specs	Specifications (boundaries) of the active area of the graph.
selection	A selection of type GwySelectionGraph1DArea.

gwy_graph_draw_grid ()

void
gwy_graph_draw_grid (GdkDrawable *drawable,
                     GdkGC *gc,
                     GwyGraphActiveAreaSpecs *specs,
                     guint nxdata,
                     const gdouble *x_grid_data,
                     guint nydata,
                     const gdouble *y_grid_data);

Draws an array of grid lines on a drawable.

Parameters

drawable	A drawable.
gc	Graphics context. It is modified by this function unpredictably.
specs	Specifications (boundaries) of the active area of the graph.
nxdata	Number of x grid positions.
x_grid_data	Array of grid data for the x-axis, it can be NULL if nxdata is zero.
nydata	Number of y grid positions.
y_grid_data	Array of grid data for the y-axis, it can be NULL if nydata is zero.

gwy_graph_get_preset_color ()

const GwyRGBA *
gwy_graph_get_preset_color (guint i);

Gets a preset graph color.

Preset colors are a set of selected colors one can use to distingush graph curves when there is no reason to prefer a particular color. Note they can occasionally change between version, even their number can change.

Parameters

i

Color number, starting from 0 which is always black. It can be any number but colors start to repeat after gwy_graph_get_n_preset_colors() colors.

Returns

A constant color that must not be neither modified nor freed.

gwy_graph_get_n_preset_colors ()

guint
gwy_graph_get_n_preset_colors (void);

Gets the number of distinct colors gwy_graph_get_preset_color() can return.

Returns

The number of distinct colors.

Types and Values

GwyGraphActiveAreaSpecs

typedef struct {
    gint xmin;
    gint ymin;
    gint height;
    gint width;
    gdouble real_xmin;
    gdouble real_ymin;
    gdouble real_height;
    gdouble real_width;
    gboolean log_x;
    gboolean log_y;
} GwyGraphActiveAreaSpecs;

Graph area specification (for graph drawing primitives).

Members

gint xmin;	X offset of the active area with respect to drawable left border.
gint ymin;	Y offset of the active area with respect to drawable top border.
gint height;	Active area height in pixels.
gint width;	Active area width pixels.
gdouble real_xmin;	Minimum x value in real units.
gdouble real_ymin;	Minimum y value in real units.
gdouble real_height;	Area height in real units.
gdouble real_width;	Area width in real units.
gboolean log_x;	TRUE if x-axis is logarithmic.
gboolean log_y;	TRUE if y-axis is logarithmic.