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GogRenderer

GogRenderer — Rendering

Functions

void gog_renderer_draw_circle ()
void gog_renderer_draw_color_map ()
void gog_renderer_draw_data_label ()
void gog_renderer_draw_gostring ()
void gog_renderer_draw_grip ()
void gog_renderer_draw_marker ()
void gog_renderer_draw_rectangle ()
void gog_renderer_draw_rotated_rectangle ()
void gog_renderer_draw_selection_rectangle ()
void gog_renderer_draw_shape ()
void gog_renderer_draw_text ()
gboolean gog_renderer_export_image ()
void gog_renderer_fill_circle ()
void gog_renderer_fill_rectangle ()
void gog_renderer_fill_serie ()
void gog_renderer_fill_shape ()
cairo_surface_t * gog_renderer_get_cairo_surface ()
void gog_renderer_get_gostring_AABR ()
void gog_renderer_get_gostring_OBR ()
double gog_renderer_get_hairline_width_pts ()
GdkPixbuf * gog_renderer_get_pixbuf ()
double gog_renderer_get_scale ()
void gog_renderer_get_text_AABR ()
void gog_renderer_get_text_OBR ()
#define gog_renderer_in_grip()
double gog_renderer_line_size ()
GogRenderer * gog_renderer_new ()
void gog_renderer_pop_clip ()
void gog_renderer_pop_style ()
double gog_renderer_pt2r ()
double gog_renderer_pt2r_x ()
double gog_renderer_pt2r_y ()
void gog_renderer_push_clip ()
void gog_renderer_push_clip_rectangle ()
void gog_renderer_push_style ()
gboolean gog_renderer_render_to_cairo ()
void gog_renderer_request_update ()
void gog_renderer_stroke_circle ()
void gog_renderer_stroke_rectangle ()
void gog_renderer_stroke_serie ()
void gog_renderer_stroke_shape ()
gboolean gog_renderer_update ()

Object Hierarchy


Description

Note that GogGraph has a functions for export/rendering, so you do not always need to use a GogRenderer directly.

Functions

gog_renderer_draw_circle ()

void
gog_renderer_draw_circle (GogRenderer *rend,
                          double x,
                          double y,
                          double r);


gog_renderer_draw_color_map ()

void
gog_renderer_draw_color_map (GogRenderer *rend,
                             GogAxisColorMap const *map,
                             int discrete,
                             gboolean horizontal,
                             GogViewAllocation const *rect);


gog_renderer_draw_data_label ()

void
gog_renderer_draw_data_label (GogRenderer *rend,
                              GogSeriesLabelElt const *elt,
                              GogViewAllocation const *pos,
                              GOAnchorType anchor,
                              GOStyle *legend_style);


gog_renderer_draw_gostring ()

void
gog_renderer_draw_gostring (GogRenderer *rend,
                            GOString *str,
                            GogViewAllocation const *pos,
                            GOAnchorType anchor,
                            GoJustification justification,
                            double width);

Have rend draw layout in the at pos .{x,y} anchored by the anchor corner. If pos.w or pos.h are >= 0 then clip the results to less than that size.

Parameters

rend

GogRenderer

 

str

the GOString to draw

 

pos

GogViewAllocation

 

anchor

GOAnchorType how to draw relative to pos

 

justification

GoJustification for multiline string.

 

width

if positive, the maximum width to get a multiline string if needed.

 

gog_renderer_draw_grip ()

void
gog_renderer_draw_grip (GogRenderer *renderer,
                        double x,
                        double y);

Draw a grip, used for moving/resizing of objects.

Parameters

renderer

GogRenderer

 

x

x position of grip

 

y

y position of grip

 

gog_renderer_draw_marker ()

void
gog_renderer_draw_marker (GogRenderer *rend,
                          double x,
                          double y);

Parameters

rend

GogRenderer

 

x

X-coordinate

 

y

Y-coordinate

 

gog_renderer_draw_rectangle ()

void
gog_renderer_draw_rectangle (GogRenderer *rend,
                             GogViewAllocation const *rect);

A utility routine to build a closed rectangle vpath.

Parameters

rend

a GogRenderer

 

rect

position and extent of rectangle

 

gog_renderer_draw_rotated_rectangle ()

void
gog_renderer_draw_rotated_rectangle (GogRenderer *rend,
                                     GogViewAllocation const *rect,
                                     gboolean rotate_bg);


gog_renderer_draw_selection_rectangle ()

void
gog_renderer_draw_selection_rectangle (GogRenderer *renderer,
                                       GogViewAllocation const *rectangle);


gog_renderer_draw_shape ()

void
gog_renderer_draw_shape (GogRenderer *renderer,
                         GOPath const *path);


gog_renderer_draw_text ()

void
gog_renderer_draw_text (GogRenderer *rend,
                        char const *text,
                        GogViewAllocation const *pos,
                        GOAnchorType anchor,
                        gboolean use_markup,
                        GoJustification justification,
                        double width);

Have rend draw text in the at pos .{x,y} anchored by the anchor corner. If pos.w or pos.h are >= 0 then clip the results to less than that size.

Parameters

rend

GogRenderer

 

text

the string to draw

 

pos

GogViewAllocation

 

anchor

GOAnchorType how to draw relative to pos

 

use_markup

wether to use pango markup

 

justification

GoJustification for multiline text.

 

width

if positive, the maximum width to get a multiline text if needed.

 

gog_renderer_export_image ()

gboolean
gog_renderer_export_image (GogRenderer *renderer,
                           GOImageFormat format,
                           GsfOutput *output,
                           double x_dpi,
                           double y_dpi);

Exports an image of graph in given format , writing results in a GsfOutput stream. If export format type is a bitmap one, it computes image size with x_dpi, y_dpi and graph size (see gog_graph_get_size()).

Parameters

renderer

a GogRenderer

 

format

image format for export

 

output

a GsfOutput stream

 

x_dpi

x resolution of exported graph

 

y_dpi

y resolution of exported graph

 

Returns

TRUE if export succeed.


gog_renderer_fill_circle ()

void
gog_renderer_fill_circle (GogRenderer *rend,
                          double x,
                          double y,
                          double r);


gog_renderer_fill_rectangle ()

void
gog_renderer_fill_rectangle (GogRenderer *rend,
                             GogViewAllocation const *rect);


gog_renderer_fill_serie ()

void
gog_renderer_fill_serie (GogRenderer *renderer,
                         GOPath const *path,
                         GOPath const *close_path);


gog_renderer_fill_shape ()

void
gog_renderer_fill_shape (GogRenderer *renderer,
                         GOPath const *path);


gog_renderer_get_cairo_surface ()

cairo_surface_t *
gog_renderer_get_cairo_surface (GogRenderer *renderer);

Returns


gog_renderer_get_gostring_AABR ()

void
gog_renderer_get_gostring_AABR (GogRenderer *rend,
                                GOString *str,
                                GOGeometryAABR *aabr,
                                double max_width);

Parameters

rend

GogRenderer

 

str

the string to draw

 

aabr

GOGeometryAABR to store the Axis Aligned Bounding Rectangle of text .

 

gog_renderer_get_gostring_OBR ()

void
gog_renderer_get_gostring_OBR (GogRenderer *rend,
                               GOString *str,
                               GOGeometryOBR *obr,
                               double max_width);

Parameters

rend

GogRenderer

 

str

the string to draw

 

obr

GOGeometryOBR to store the Object Bounding Rectangle of text .

 

gog_renderer_get_hairline_width_pts ()

double
gog_renderer_get_hairline_width_pts (GogRenderer const *rend);

Parameters

rend

a GogRenderer

 

Returns

the hairline width in pts.


gog_renderer_get_pixbuf ()

GdkPixbuf *
gog_renderer_get_pixbuf (GogRenderer *renderer);

Parameters

renderer

GogRenderer

 

Returns

current pixbuf buffer from a renderer that can render into a pixbuf. or NULL on error.

[transfer none]


gog_renderer_get_scale ()

double
gog_renderer_get_scale (GogRenderer *renderer);

Returns


gog_renderer_get_text_AABR ()

void
gog_renderer_get_text_AABR (GogRenderer *rend,
                            char const *text,
                            gboolean use_markup,
                            GOGeometryAABR *aabr,
                            double max_width);

Parameters

rend

GogRenderer

 

text

the string to draw

 

use_markup

whether to use pango markup

 

aabr

GOGeometryAABR to store the Axis Aligned Bounding Rectangle of text .

 

gog_renderer_get_text_OBR ()

void
gog_renderer_get_text_OBR (GogRenderer *rend,
                           char const *text,
                           gboolean use_markup,
                           GOGeometryOBR *obr,
                           double max_width);

Parameters

rend

GogRenderer

 

text

the string to draw

 

use_markup

wether to use pango markup

 

obr

GOGeometryOBR to store the Object Bounding Rectangle of text .

 

gog_renderer_in_grip()

#define             gog_renderer_in_grip(x,y,grip_x,grip_y)


gog_renderer_line_size ()

double
gog_renderer_line_size (GogRenderer const *r,
                        double width);

Returns


gog_renderer_new ()

GogRenderer *
gog_renderer_new (GogGraph *graph);

Parameters

graph

graph model

 

Returns

a new GogRenderer which can render into a pixbuf, and sets graph as its model.


gog_renderer_pop_clip ()

void
gog_renderer_pop_clip (GogRenderer *rend);

End the current clipping.

Parameters

rend

GogRenderer

 

gog_renderer_pop_style ()

void
gog_renderer_pop_style (GogRenderer *rend);


gog_renderer_pt2r ()

double
gog_renderer_pt2r (GogRenderer const *r,
                   double d);

Returns


gog_renderer_pt2r_x ()

double
gog_renderer_pt2r_x (GogRenderer const *r,
                     double d);

Returns


gog_renderer_pt2r_y ()

double
gog_renderer_pt2r_y (GogRenderer const *r,
                     double d);

Returns


gog_renderer_push_clip ()

void
gog_renderer_push_clip (GogRenderer *rend,
                        GOPath const *path);

Defines the current clipping region.

Parameters

rend

GogRenderer

 

path

a GOPath

 

gog_renderer_push_clip_rectangle ()

void
gog_renderer_push_clip_rectangle (GogRenderer *rend,
                                  double x,
                                  double y,
                                  double w,
                                  double h);

Defines a rectangular clipping region. For efficient screen rendering, this function takes care to round the coordinates.

Parameters

rend

GogRenderer

 

x

left coordinate

 

y

top coordinate

 

w

width of clipping rectangle

 

h

height of clipping rectangle

 

gog_renderer_push_style ()

void
gog_renderer_push_style (GogRenderer *rend,
                         GOStyle const *style);


gog_renderer_render_to_cairo ()

gboolean
gog_renderer_render_to_cairo (GogRenderer *renderer,
                              cairo_t *cairo,
                              double width,
                              double height);

Returns


gog_renderer_request_update ()

void
gog_renderer_request_update (GogRenderer *renderer);


gog_renderer_stroke_circle ()

void
gog_renderer_stroke_circle (GogRenderer *rend,
                            double x,
                            double y,
                            double r);


gog_renderer_stroke_rectangle ()

void
gog_renderer_stroke_rectangle (GogRenderer *rend,
                               GogViewAllocation const *rect);


gog_renderer_stroke_serie ()

void
gog_renderer_stroke_serie (GogRenderer *renderer,
                           GOPath const *path);


gog_renderer_stroke_shape ()

void
gog_renderer_stroke_shape (GogRenderer *renderer,
                           GOPath const *path);


gog_renderer_update ()

gboolean
gog_renderer_update (GogRenderer *renderer,
                     double w,
                     double h);

Requests a renderer update, only useful for pixbuf based renderer.

Parameters

renderer

a GogRenderer

 

w

requested width

 

h

requested height

 

Returns

TRUE if a redraw is necessary.

Types and Values

enum GoJustification

Used for justifying the text inside multiline label.

Members

GO_JUSTIFY_LEFT

The text is placed at the left edge of the label.

 

GO_JUSTIFY_RIGHT

The text is placed at the right edge of the label.

 

GO_JUSTIFY_CENTER

The text is placed in the center of the label.

 

GO_JUSTIFY_FILL

The text is placed is distributed across the label.

 

GOG_RENDERER_GRIP_SIZE

#define GOG_RENDERER_GRIP_SIZE 4


GOG_RENDERER_HAIRLINE_WIDTH_PTS

#define GOG_RENDERER_HAIRLINE_WIDTH_PTS 0.5

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