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af58ef32 SC |
1 | #ifndef GRAPH_H |
2 | #define GRAPH_H | |
3 | ||
4 | struct graph; | |
5 | ||
cae08727 | 6 | |
f3e8440f | 7 | struct graph *graph_new(unsigned int xdim, unsigned int ydim, const char *font); |
ba35aa8d | 8 | /* graph_new() Returns a new graph structure of the given dimensions and font */ |
3ea48b88 | 9 | void graph_set_size(struct graph *g, unsigned int xdim, unsigned int ydim); |
ba35aa8d | 10 | /* graph_set_size() Changes the size of a graph to the given dimensions. */ |
57f9d28e SC |
11 | void graph_set_position(struct graph *g, double xoffset, double yoffset); |
12 | /* graph_set_position() sets the x- and y-offset to translate the graph */ | |
af58ef32 | 13 | void bar_graph_draw(struct graph *g, cairo_t *cr); |
ba35aa8d | 14 | /* bar_graph_draw() draws the given graph as a bar graph */ |
af58ef32 | 15 | void line_graph_draw(struct graph *g, cairo_t *cr); |
ba35aa8d | 16 | /* line_graph_draw draws the given graph as a line graph */ |
af58ef32 | 17 | void line_graph_set_data_count_limit(struct graph *g, int per_label_limit); |
ba35aa8d SC |
18 | /* line_graph_set_data_count_limit() limits the amount of data which can |
19 | * be added to a line graph. Once the limit is reached, the oldest data | |
20 | * is discarded as new data is added | |
21 | */ | |
af58ef32 | 22 | void graph_title(struct graph *g, const char *title); |
ba35aa8d | 23 | /* graph_title() sets the main title of the graph to the given string */ |
af58ef32 | 24 | void graph_x_title(struct graph *g, const char *title); |
ba35aa8d | 25 | /* graph_x_title() sets the title of the x axis to the given string */ |
af58ef32 | 26 | void graph_y_title(struct graph *g, const char *title); |
ba35aa8d | 27 | /* graph_y_title() sets the title of the y axis to the given string */ |
af58ef32 | 28 | void graph_add_label(struct graph *g, const char *label); |
ba35aa8d SC |
29 | /* graph_add_label() adds a new "stream" of data to be graphed. |
30 | * For line charts, each label is a separate line on the graph. | |
31 | * For bar charts, each label is a grouping of columns on the x-axis | |
32 | * For example: | |
33 | * | |
34 | * | * | ** | |
35 | * | * xxxxxxxx | ** | |
36 | * | *** x | ** ** | |
37 | * | *x **** | ** ** ** | |
38 | * | xxxx* ***** | ** xx ** xx ** | |
39 | * | x ** | ** xx ** xx ** xx | |
40 | * | x | ** xx ** xx ** xx | |
41 | * ----------------------- ------------------------- | |
42 | * A B C | |
43 | * | |
44 | * For a line graph, the 'x's For a bar graph, | |
45 | * would be on one "label", and 'A', 'B', and 'C' | |
46 | * the '*'s would be on another are the labels. | |
47 | * label. | |
48 | */ | |
49 | ||
09ad20ff | 50 | int graph_add_data(struct graph *g, const char *label, const double value); |
ba35aa8d | 51 | /* graph_add_data() is used to add data to the labels of a bar graph */ |
09ad20ff | 52 | int graph_add_xy_data(struct graph *g, const char *label, |
af58ef32 | 53 | const double x, const double y); |
ba35aa8d SC |
54 | /* graph_add_xy_data is used to add data to the labels of a line graph */ |
55 | ||
af58ef32 SC |
56 | void graph_set_color(struct graph *g, const char *label, |
57 | double red, double green, double blue); | |
ba35aa8d SC |
58 | #define INVISIBLE_COLOR (-1.0) |
59 | /* graph_set_color is used to set the color used to plot the data in | |
60 | * a line graph. INVISIBLE_COLOR can be used to plot the data invisibly. | |
61 | * Invisible data will have the same effect on the scaling of the axes | |
62 | * as visible data. | |
63 | */ | |
64 | ||
af58ef32 | 65 | void graph_free(struct graph *bg); |
ba35aa8d | 66 | /* free a graph allocated by graph_new() */ |
af58ef32 | 67 | |
7175d91d SC |
68 | typedef void (*graph_axis_unit_change_callback)(struct graph *g, int power_of_ten); |
69 | void graph_x_axis_unit_change_notify(struct graph *g, graph_axis_unit_change_callback f); | |
70 | void graph_y_axis_unit_change_notify(struct graph *g, graph_axis_unit_change_callback f); | |
ba35aa8d SC |
71 | /* The labels used on the x and y axes may be shortened. You can register for callbacks |
72 | * so that you can know how the labels are shorted, typically used to adjust the axis | |
73 | * titles to display the proper units. The power_of_ten parameter indicates what power | |
74 | * of ten the labels have been divided by (9, 6, 3, or 0, corresponding to billions, | |
75 | * millions, thousands and ones. | |
76 | */ | |
af58ef32 | 77 | |
def0ac29 SC |
78 | void graph_add_extra_space(struct graph *g, double left_percent, double right_percent, |
79 | double top_percent, double bottom_percent); | |
80 | /* graph_add_extra_space() adds extra space to edges of the the graph | |
81 | * so that the data doesn't go to the very edges. | |
82 | */ | |
83 | ||
af58ef32 SC |
84 | #endif |
85 |