- GtkWidget *chart = bv_chart_new();
- bv_chart_add_point(BV_CHART(chart), 0.0, 0.0);
- bv_chart_add_point(BV_CHART(chart), 1.0, 1.0);
- bv_chart_add_point(BV_CHART(chart), 3.0, 2.0);
+ struct State *state = (struct State *)user_data;
+ state->voltage = BV_CHART(bv_chart_new());
+ bv_chart_add_point(state->voltage, 0.0, 0.0);
+ bv_chart_add_point(state->voltage, 1.0, 1.0);
+ bv_chart_add_point(state->voltage, 3.0, 2.0);