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feat(example) add lv_example_chart_9.py (#2604)

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* Create lv_example_chart_9.py

lv_example_chart_9.c was exactly what i needed, thanks for that one!
the only thing is, i needed it in MicroPython :-) 
Here it is

* Update lv_example_chart_9.py

removed duplicate (... = lv.CHAR_POINT.NONE) lines

* Update lv_example_chart_9.py

restored gap
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Karijn Wessing 2021-10-01 09:51:49 +02:00 committed by GitHub
parent d9c6ad0425
commit e7ba9b93af
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examples/widgets/chart/lv_example_chart_9.py Normal file
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import display_driver
import lvgl as lv
def add_data(t):
chart.set_next_value(ser, lv.rand(10, 90))
p = chart.get_point_count()
s = chart.get_x_start_point(ser)
a = chart.get_y_array(ser)
a[(s + 1) % p] = lv.CHART_POINT.NONE
a[(s + 2) % p] = lv.CHART_POINT.NONE
a[(s + 3) % p] = lv.CHART_POINT.NONE
chart.refresh()
#
# Circular line chart with gap
#
chart = lv.chart(lv.scr_act())
chart.set_update_mode(lv.chart.UPDATE_MODE.CIRCULAR)
chart.set_size(200, 150)
chart.center()
chart.set_point_count(30)
ser = chart.add_series(lv.palette_main(lv.PALETTE.RED), lv.chart.AXIS.PRIMARY_Y)
#Prefill with data
for i in range(0, 30):
chart.set_next_value(ser, lv.rand(10, 90))
lv.timer_create(add_data, 200, None)