1 files changed, 18 insertions, 0 deletions
diff --git a/overlay/chart.h b/overlay/chart.h
new file mode 100644
index 00000000..c0f0065c
--- /dev/null
+++ b/overlay/chart.h
@@ -0,0 +1,18 @@
+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);