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struct chart {
const char *name;
int x, y, w, h;
int num_samples;
int current_sample;
int range_automatic;
float rgb[4];
double range[2];
double *samples;
};
int chart_init(struct chart *chart, const char *name, int num_samples);
void chart_set_rgba(struct chart *chart, float red, float green, float blue, float alpha);
void chart_set_position(struct chart *chart, int x, int y);
void chart_set_size(struct chart *chart, int w, int h);
void chart_set_range(struct chart *chart, double min, double max);
void chart_add_sample(struct chart *chart, double value);
void chart_draw(struct chart *chart, cairo_t *cr);
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