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84 lines
2.3 KiB
Python
84 lines
2.3 KiB
Python
#!/opt/bin/lv_micropython -i
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import lvgl as lv
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def event_cb(e):
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code = e.get_code()
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chart = e.get_target_obj()
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if code == lv.EVENT.VALUE_CHANGED:
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chart.invalidate()
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if code == lv.EVENT.REFR_EXT_DRAW_SIZE:
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# s = lv.coord_t.__cast__(e.get_param())
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# print("s: {:d}".format(s))
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e.set_ext_draw_size(20)
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elif code == lv.EVENT.DRAW_POST_END:
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id = chart.get_pressed_point()
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if id == lv.CHART_POINT_NONE :
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return
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# print("Selected point {:d}".format(id))
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ser = chart.get_series_next(None)
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while(ser) :
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p = lv.point_t()
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chart.get_point_pos_by_id(ser, id, p)
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# print("point coords: x: {:d}, y: {:d}".format(p.x,p.y))
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y_array = chart.get_y_array(ser)
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value = y_array[id]
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buf = lv.SYMBOL.DUMMY + "{:2d}".format(value)
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draw_rect_dsc = lv.draw_rect_dsc_t()
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draw_rect_dsc.init()
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draw_rect_dsc.bg_color = lv.color_black()
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draw_rect_dsc.bg_opa = lv.OPA._50
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draw_rect_dsc.radius = 3
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draw_rect_dsc.bg_img_src = buf
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draw_rect_dsc.bg_img_recolor = lv.color_white()
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coords = lv.area_t()
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chart.get_coords(coords)
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# print("coords: x1: {:d}, y1: {:d}".format(coords.x1, coords.y1))
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a = lv.area_t()
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a.x1 = coords.x1 + p.x - 20
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a.x2 = coords.x1 + p.x + 20
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a.y1 = coords.y1 + p.y - 30
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a.y2 = coords.y1 + p.y - 10
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# print("a: x1: {:d}, x2: {:d}, y1: {:d}, y2: {:d}".format(a.x1,a.x2,a.y1,a.y2))
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draw_ctx = e.get_draw_ctx()
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draw_ctx.rect(draw_rect_dsc, a)
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ser = chart.get_series_next(ser)
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elif code == lv.EVENT.RELEASED:
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chart.invalidate()
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#
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# Show the value of the pressed points
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#
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# Create a chart
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chart = lv.chart(lv.scr_act())
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chart.set_size(200, 150)
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chart.center()
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chart.add_event(event_cb, lv.EVENT.ALL, None)
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chart.refresh_ext_draw_size()
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# Zoom in a little in X
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chart.set_zoom_x(800)
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# Add two data series
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ser1 = chart.add_series(lv.palette_main(lv.PALETTE.RED), lv.chart.AXIS.PRIMARY_Y)
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ser2 = chart.add_series(lv.palette_main(lv.PALETTE.GREEN), lv.chart.AXIS.PRIMARY_Y)
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for i in range(10):
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chart.set_next_value(ser1, lv.rand(60, 90))
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chart.set_next_value(ser2, lv.rand(10, 40))
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