78 lines
2.4 KiB
Python
78 lines
2.4 KiB
Python
#!/opt/bin/lv_micropython -i
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import utime as time
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import lvgl as lv
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import display_driver
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def draw_event_cb(e):
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dsc = e.get_draw_part_dsc()
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if dsc.part == lv.PART.ITEMS:
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obj = e.get_target()
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ser = obj.get_series_next(None)
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cnt = obj.get_point_count()
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# print("cnt: ",cnt)
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# Make older value more transparent
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dsc.rect_dsc.bg_opa = (lv.OPA.COVER * dsc.id) // (cnt - 1)
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# Make smaller values blue, higher values red
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# x_array = chart.get_x_array(ser)
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# y_array = chart.get_y_array(ser)
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# dsc->id is the tells drawing order, but we need the ID of the point being drawn.
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start_point = chart.get_x_start_point(ser)
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# print("start point: ",start_point)
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p_act = (start_point + dsc.id) % cnt # Consider start point to get the index of the array
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# print("p_act", p_act)
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x_opa = (x_array[p_act] * lv.OPA._50) // 200
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y_opa = (y_array[p_act] * lv.OPA._50) // 1000
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dsc.rect_dsc.bg_color = lv.palette_main(lv.PALETTE.RED).color_mix(
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lv.palette_main(lv.PALETTE.BLUE),
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x_opa + y_opa)
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def add_data(timer,chart):
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# print("add_data")
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x = lv.rand(0,200)
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y = lv.rand(0,1000)
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chart.set_next_value2(ser, x, y)
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# chart.set_next_value2(chart.gx, y)
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x_array.pop(0)
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x_array.append(x)
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y_array.pop(0)
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y_array.append(y)
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#
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# A scatter chart
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#
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chart = lv.chart(lv.scr_act())
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chart.set_size(200, 150)
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chart.align(lv.ALIGN.CENTER, 0, 0)
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chart.add_event_cb(draw_event_cb, lv.EVENT.DRAW_PART_BEGIN, None)
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chart.set_style_line_width(0, lv.PART.ITEMS) # Remove the lines
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chart.set_type(lv.chart.TYPE.SCATTER)
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chart.set_axis_tick(lv.chart.AXIS.PRIMARY_X, 5, 5, 5, 1, True, 30)
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chart.set_axis_tick(lv.chart.AXIS.PRIMARY_Y, 10, 5, 6, 5, True, 50)
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chart.set_range(lv.chart.AXIS.PRIMARY_X, 0, 200)
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chart.set_range(lv.chart.AXIS.PRIMARY_Y, 0, 1000)
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chart.set_point_count(50)
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ser = chart.add_series(lv.palette_main(lv.PALETTE.RED), lv.chart.AXIS.PRIMARY_Y)
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x_array = []
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y_array = []
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for i in range(50):
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x_array.append(lv.rand(0, 200))
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y_array.append(lv.rand(0, 1000))
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ser.x_points = x_array
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ser.y_points = y_array
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# Create an `lv_timer` to update the chart.
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timer = lv.timer_create_basic()
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timer.set_period(100)
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timer.set_cb(lambda src: add_data(timer,chart))
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