chart.py

import lvgl as lv

class Anim(lv.anim_t):
    def __init__(self, obj, val, size, exec_cb, path_cb, time=500, playback=False, ready_cb=None):
        super().__init__()
        self.init()
        self.set_time(time)
        self.set_values(val, val + size)
        if callable(exec_cb):
            self.set_custom_exec_cb(exec_cb)
        else:
            self.set_exec_cb(obj, exec_cb)
        self.set_path_cb(path_cb)
        if playback:
            self.set_playback(0)
        if ready_cb:
            self.set_ready_cb(ready_cb)
        self.start()

class AnimatedChart(lv.chart):
    def __init__(self, parent, val, size):
        super().__init__(parent)
        self.val = val
        self.size = size
        self.max = 2000
        self.min = 500
        self.factor = 100
        self.anim_phase1()

    def anim_phase1(self):
        self.phase1 = Anim(
            self,
            self.val,
            self.size,
            lambda a, val: self.set_range(self.AXIS.PRIMARY_Y, 0, val),
            lv.anim_t.path_ease_in,
            ready_cb=lambda a:self.anim_phase2(),
            time=(self.max * self.factor) // 100,
        )

    def anim_phase2(self):
        self.phase2 = Anim(
            self,
            self.val + self.size,
            -self.size,
            lambda a, val: self.set_range(self.AXIS.PRIMARY_Y, 0, val),
            lv.anim_t.path_ease_out,
            ready_cb=lambda a:self.anim_phase1(),
            time=(self.min * self.factor) // 100,
        )