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ndg/lib/lvgl/examples/widgets/chart/lv_example_chart_4.py

74 lines
2.0 KiB
Python

def event_cb(e):
code = e.get_code()
chart = e.get_target()
if code == lv.EVENT.VALUE_CHANGED:
chart.invalidate()
if code == lv.EVENT.REFR_EXT_DRAW_SIZE:
e.set_ext_draw_size(20)
elif code == lv.EVENT.DRAW_POST_END:
id = lv.chart.get_pressed_point(chart)
if id == lv.CHART_POINT.NONE:
return
# print("Selected point ", id)
for i in range(len(series)):
p = lv.point_t()
chart.get_point_pos_by_id(series[i], id, p)
value = series_points[i][id]
buf = lv.SYMBOL.DUMMY + "$" + str(value)
draw_rect_dsc = lv.draw_rect_dsc_t()
draw_rect_dsc.init()
draw_rect_dsc.bg_color = lv.color_black()
draw_rect_dsc.bg_opa = lv.OPA._50
draw_rect_dsc.radius = 3
draw_rect_dsc.bg_img_src = buf
draw_rect_dsc.bg_img_recolor = lv.color_white()
a = lv.area_t()
coords = lv.area_t()
chart.get_coords(coords)
a.x1 = coords.x1 + p.x - 20
a.x2 = coords.x1 + p.x + 20
a.y1 = coords.y1 + p.y - 30
a.y2 = coords.y1 + p.y - 10
clip_area = lv.area_t.__cast__(e.get_param())
lv.draw_rect(a, clip_area, draw_rect_dsc)
elif code == lv.EVENT.RELEASED:
chart.invalidate()
#
# Add ticks and labels to the axis and demonstrate scrolling
#
# Create a chart
chart = lv.chart(lv.scr_act())
chart.set_size(200, 150)
chart.center()
chart.add_event_cb(event_cb, lv.EVENT.ALL, None)
chart.refresh_ext_draw_size()
# Zoom in a little in X
chart.set_zoom_x(800)
# Add two data series
ser1 = chart.add_series(lv.palette_main(lv.PALETTE.RED), lv.chart.AXIS.PRIMARY_Y)
ser2 = chart.add_series(lv.palette_main(lv.PALETTE.GREEN), lv.chart.AXIS.PRIMARY_Y)
ser1_p = []
ser2_p = []
for i in range(10):
ser1_p.append(lv.rand(60,90))
ser2_p.append(lv.rand(10,40))
ser1.y_points = ser1_p
ser2.y_points = ser2_p
series = [ser1,ser2]
series_points=[ser1_p,ser2_p]