A problem of drawing waveforms

Hello. I transplanted littlevgl on nrf52840, but now when we use chart control and function lv_line_set_points, we find that the waveform drawing can not meet our requirements. The background grid color is too black and can’t change when using the chart control. When drawing waveforms with the function lv_line_set_points, you want to keep the contents of the previous drawing and continue to draw new ones later, but littlevgl only recognizes the contents of the last drawing. I want to modify the source code to achieve, but the littlevgl line-drawing mechanism is not very well understood,do not know you can point out?

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