89 lines
3.1 KiB
Python
89 lines
3.1 KiB
Python
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class ExampleChart_6():
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def __init__(self):
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self.last_id = -1
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#
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# Show cursor on the clicked point
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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, -10)
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chart.set_axis_tick(lv.chart.AXIS.PRIMARY_Y, 10, 5, 6, 5, True, 40)
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chart.set_axis_tick(lv.chart.AXIS.PRIMARY_X, 10, 5, 10, 1, True, 30)
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chart.add_event_cb(self.event_cb, lv.EVENT.ALL, None)
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chart.refresh_ext_draw_size()
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self.cursor = chart.add_cursor(lv.palette_main(lv.PALETTE.BLUE), lv.DIR.LEFT | lv.DIR.BOTTOM)
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self.ser = chart.add_series(lv.palette_main(lv.PALETTE.RED), lv.chart.AXIS.PRIMARY_Y)
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self.ser_p = []
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for i in range(10):
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self.ser_p.append(lv.rand(10,90))
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self.ser.y_points = self.ser_p
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newser = chart.get_series_next(None)
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# print("length of data points: ",len(newser.points))
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chart.set_zoom_x(500)
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label = lv.label(lv.scr_act())
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label.set_text("Click on a point")
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label.align_to(chart, lv.ALIGN.OUT_TOP_MID, 0, -5)
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def event_cb(self,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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# print("last_id: ",self.last_id)
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self.last_id = chart.get_pressed_point()
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if self.last_id != lv.CHART_POINT.NONE:
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p = lv.point_t()
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chart.get_point_pos_by_id(self.ser, self.last_id, p)
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chart.set_cursor_point(self.cursor, None, self.last_id)
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elif code == lv.EVENT.DRAW_PART_END:
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# print("EVENT.DRAW_PART_END")
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dsc = lv.obj_draw_part_dsc_t.__cast__(e.get_param())
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# if dsc.p1 and dsc.p2:
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# print("p1, p2", dsc.p1,dsc.p2)
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# print("p1.y, p2.y", dsc.p1.y, dsc.p2.y)
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# print("last_id: ",self.last_id)
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if dsc.part == lv.PART.CURSOR and dsc.p1 and dsc.p2 and dsc.p1.y == dsc.p2.y and self.last_id >= 0:
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v = self.ser_p[self.last_id]
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# print("value: ",v)
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value_txt = str(v)
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size = lv.point_t()
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lv.txt_get_size(size, value_txt, lv.font_default(), 0, 0, lv.COORD.MAX, lv.TEXT_FLAG.NONE)
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a = lv.area_t()
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a.y2 = dsc.p1.y - 5
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a.y1 = a.y2 - size.y - 10
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a.x1 = dsc.p1.x + 10
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a.x2 = a.x1 + size.x + 10
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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.palette_main(lv.PALETTE.BLUE)
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draw_rect_dsc.radius = 3
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lv.draw_rect(a, dsc.clip_area, draw_rect_dsc)
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draw_label_dsc = lv.draw_label_dsc_t()
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draw_label_dsc.init()
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draw_label_dsc.color = lv.color_white()
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a.x1 += 5
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a.x2 -= 5
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a.y1 += 5
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a.y2 -= 5
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lv.draw_label(a, dsc.clip_area, draw_label_dsc, value_txt, None)
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example_chart_6 = ExampleChart_6()
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