1def event_cb(e):
2    code = e.get_code()
3    chart = e.get_target()
4
5    if code == lv.EVENT.VALUE_CHANGED:
6        chart.invalidate()
7
8    if code == lv.EVENT.REFR_EXT_DRAW_SIZE:
9        e.set_ext_draw_size(20)
10
11    elif code == lv.EVENT.DRAW_POST_END:
12        id = lv.chart.get_pressed_point(chart)
13        if id == lv.CHART_POINT.NONE:
14            return
15        # print("Selected point ", id)
16        for i in range(len(series)):
17            p = lv.point_t()
18            chart.get_point_pos_by_id(series[i], id, p)
19            value = series_points[i][id]
20            buf = lv.SYMBOL.DUMMY + "$" + str(value)
21
22            draw_rect_dsc = lv.draw_rect_dsc_t()
23            draw_rect_dsc.init()
24            draw_rect_dsc.bg_color = lv.color_black()
25            draw_rect_dsc.bg_opa = lv.OPA._50
26            draw_rect_dsc.radius = 3
27            draw_rect_dsc.bg_img_src = buf
28            draw_rect_dsc.bg_img_recolor = lv.color_white()
29
30            a = lv.area_t()
31            coords = lv.area_t()
32            chart.get_coords(coords)
33            a.x1 = coords.x1 + p.x - 20
34            a.x2 = coords.x1 + p.x + 20
35            a.y1 = coords.y1 + p.y - 30
36            a.y2 = coords.y1 + p.y - 10
37
38            clip_area = lv.area_t.__cast__(e.get_param())
39            lv.draw_rect(a, clip_area, draw_rect_dsc)
40
41    elif code == lv.EVENT.RELEASED:
42        chart.invalidate()
43
44#
45# Add ticks and labels to the axis and demonstrate scrolling
46#
47
48# Create a chart
49chart = lv.chart(lv.scr_act())
50chart.set_size(200, 150)
51chart.center()
52
53chart.add_event_cb(event_cb, lv.EVENT.ALL, None)
54chart.refresh_ext_draw_size()
55
56# Zoom in a little in X
57chart.set_zoom_x(800)
58
59# Add two data series
60ser1 = chart.add_series(lv.palette_main(lv.PALETTE.RED), lv.chart.AXIS.PRIMARY_Y)
61ser2 = chart.add_series(lv.palette_main(lv.PALETTE.GREEN), lv.chart.AXIS.PRIMARY_Y)
62
63ser1_p = []
64ser2_p = []
65for i in range(10):
66    ser1_p.append(lv.rand(60,90))
67    ser2_p.append(lv.rand(10,40))
68ser1.y_points = ser1_p
69ser2.y_points = ser2_p
70
71series = [ser1,ser2]
72series_points=[ser1_p,ser2_p]
73
74