This is a chart / graph generation library written in C only using the standard C library. The program takes as input values filled in various structs and outputs .svg files. The structs define everything about the chart that is going to be generated.
Below are all the structs for each type of graph which currently are the following.
- Bar charts
- vertical
- horizontal
- Percentage charts
- Pie charts
- Doughnut charts
- Line charts
- Continous line
- Dots
struct theme_data
{
uint8_t start_color_rgb[3];
uint8_t stop_color_rgb[3];
uint8_t out_color_rgb[3];
float percentage;
};
struct general_data
{
char* file_name;
int stroke_width;
float margin;
float viewport_x;
float viewport_y;
int font_size;
};
struct axel_data
{
uint8_t axel_rgb[3];
uint8_t axel_lines_rgb[3];
int n_measure_points;
float w[2];
float h[2];
uint8_t vertical_lines;
uint8_t horizontal_lines;
float x_axel_text_angle;
uint8_t y_axel_text_right;
uint8_t numbered_x;
uint8_t numbered_y;
float axel_number_offset;
};
struct point
{
float x;
float y;
} point;
struct line
{
struct point* points;
int graph_type;
int n_points;
char* name;
uint8_t stroke_rgb[3];
};
struct graph_data
{
struct line* lines;
int n_lines;
struct general_data* general;
struct axel_data* axel_data;
};
struct pie_slice
{
float percentage;
char* name;
};
struct pie_data
{
struct axel_data* axel_data;
struct general_data* general;
struct pie_slice* slices;
struct theme_data* theme;
int n_slices;
char* doughnut_header;
char* doughnut_sub_header;
};
struct bar
{
float value;
char* name;
};
struct bar_data
{
struct general_data* general;
struct theme_data* theme;
struct axel_data* axel_data;
struct bar* bars;
int n_bars;
float spacing;
};Code snipped taken from src/cgraphlib.h
The following pictures are snapshots of the various graphs configured to look like they do in the main.c file. IMPORTANT: These graphs may be malformed if the program that is rendering the svg file does not support the svg format to the full extent.
line chart
pie chart
doughnut chart
vertical bar chart
horizontal bar chart