| #ifndef GRAPH_H |
| #define GRAPH_H |
| |
| struct graph; |
| struct graph_label; |
| |
| typedef struct graph_label * graph_label_t; |
| |
| #define GRAPH_DEFAULT_FONT "Sans 12" |
| |
| struct graph *graph_new(unsigned int xdim, unsigned int ydim, const char *font); |
| /* graph_new() Returns a new graph structure of the given dimensions and font */ |
| void graph_set_size(struct graph *g, unsigned int xdim, unsigned int ydim); |
| /* graph_set_size() Changes the size of a graph to the given dimensions. */ |
| void graph_set_position(struct graph *g, double xoffset, double yoffset); |
| /* graph_set_position() sets the x- and y-offset to translate the graph */ |
| void bar_graph_draw(struct graph *g, cairo_t *cr); |
| /* bar_graph_draw() draws the given graph as a bar graph */ |
| void line_graph_draw(struct graph *g, cairo_t *cr); |
| /* line_graph_draw draws the given graph as a line graph */ |
| void line_graph_set_data_count_limit(struct graph *g, int per_label_limit); |
| /* line_graph_set_data_count_limit() limits the amount of data which can |
| * be added to a line graph. Once the limit is reached, the oldest data |
| * is discarded as new data is added |
| */ |
| void graph_set_font(struct graph *g, const char *font); |
| void graph_title(struct graph *g, const char *title); |
| /* graph_title() sets the main title of the graph to the given string */ |
| void graph_x_title(struct graph *g, const char *title); |
| /* graph_x_title() sets the title of the x axis to the given string */ |
| void graph_y_title(struct graph *g, const char *title); |
| /* graph_y_title() sets the title of the y axis to the given string */ |
| graph_label_t graph_add_label(struct graph *g, const char *label); |
| /* graph_add_label() adds a new "stream" of data to be graphed. |
| * For line charts, each label is a separate line on the graph. |
| * For bar charts, each label is a grouping of columns on the x-axis |
| * For example: |
| * |
| * | * | ** |
| * | * xxxxxxxx | ** |
| * | *** x | ** ** |
| * | *x **** | ** ** ** |
| * | xxxx* ***** | ** xx ** xx ** |
| * | x ** | ** xx ** xx ** xx |
| * | x | ** xx ** xx ** xx |
| * ----------------------- ------------------------- |
| * A B C |
| * |
| * For a line graph, the 'x's For a bar graph, |
| * would be on one "label", and 'A', 'B', and 'C' |
| * the '*'s would be on another are the labels. |
| * label. |
| */ |
| |
| int graph_add_data(struct graph *g, graph_label_t label, const double value); |
| /* graph_add_data() is used to add data to the labels of a bar graph */ |
| int graph_add_xy_data(struct graph *g, graph_label_t label, |
| const double x, const double y, const char *tooltip); |
| /* graph_add_xy_data is used to add data to the labels of a line graph */ |
| |
| void graph_set_color(struct graph *g, graph_label_t label, |
| double red, double green, double blue); |
| #define INVISIBLE_COLOR (-1.0) |
| /* graph_set_color is used to set the color used to plot the data in |
| * a line graph. INVISIBLE_COLOR can be used to plot the data invisibly. |
| * Invisible data will have the same effect on the scaling of the axes |
| * as visible data. |
| */ |
| |
| void graph_free(struct graph *bg); |
| /* free a graph allocated by graph_new() */ |
| |
| typedef void (*graph_axis_unit_change_callback)(struct graph *g, int power_of_ten); |
| void graph_x_axis_unit_change_notify(struct graph *g, graph_axis_unit_change_callback f); |
| void graph_y_axis_unit_change_notify(struct graph *g, graph_axis_unit_change_callback f); |
| /* The labels used on the x and y axes may be shortened. You can register for callbacks |
| * so that you can know how the labels are shorted, typically used to adjust the axis |
| * titles to display the proper units. The power_of_ten parameter indicates what power |
| * of ten the labels have been divided by (9, 6, 3, or 0, corresponding to billions, |
| * millions, thousands and ones. |
| */ |
| |
| void graph_add_extra_space(struct graph *g, double left_percent, double right_percent, |
| double top_percent, double bottom_percent); |
| /* graph_add_extra_space() adds extra space to edges of the the graph |
| * so that the data doesn't go to the very edges. |
| */ |
| |
| extern int graph_has_tooltips(struct graph *g); |
| extern const char *graph_find_tooltip(struct graph *g, int x, int y); |
| extern int graph_contains_xy(struct graph *p, int x, int y); |
| |
| extern void graph_set_base_offset(struct graph *g, unsigned int base_offset); |
| extern void graph_set_graph_all_zeroes(struct graph *g, unsigned int set); |
| |
| extern void graph_clear_values(struct graph *g); |
| |
| #endif |
| |