74 lines
2.0 KiB
Python
74 lines
2.0 KiB
Python
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def event_cb(e):
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code = e.get_code()
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chart = e.get_target()
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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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e.set_ext_draw_size(20)
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elif code == lv.EVENT.DRAW_POST_END:
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id = lv.chart.get_pressed_point(chart)
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if id == lv.CHART_POINT.NONE:
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return
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# print("Selected point ", id)
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for i in range(len(series)):
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p = lv.point_t()
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chart.get_point_pos_by_id(series[i], id, p)
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value = series_points[i][id]
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buf = lv.SYMBOL.DUMMY + "$" + str(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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a = lv.area_t()
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coords = lv.area_t()
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chart.get_coords(coords)
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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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clip_area = lv.area_t.__cast__(e.get_param())
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lv.draw_rect(a, clip_area, draw_rect_dsc)
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elif code == lv.EVENT.RELEASED:
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chart.invalidate()
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#
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# Add ticks and labels to the axis and demonstrate scrolling
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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_cb(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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ser1_p = []
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ser2_p = []
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for i in range(10):
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ser1_p.append(lv.rand(60,90))
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ser2_p.append(lv.rand(10,40))
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ser1.y_points = ser1_p
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ser2.y_points = ser2_p
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series = [ser1,ser2]
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series_points=[ser1_p,ser2_p]
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