Question

我有这两个功能：

import Tkinter as tk
import math
import time


class Point:
    def __init__(self, x=0, y=0):
        self.x = x
        self.y = y


class TachoMeter(tk.Tk):
    def __init__(self, CenterPoint=Point(), LeftPoint=Point(), Radius=0, LeftBuffer=0, BottomBuffer=0, MIN_RPM=0,
                 MAX_RPM=0, canvas_height=0, canvas_width=0, *arg, **kwargs):
        tk.Tk.__init__(self, *arg, **kwargs)
        self.canvas = tk.Canvas(width=canvas_width, height=canvas_height)
        self.canvas.pack(fill="both", expand=True)
        self.CenterPoint = CenterPoint
        self.MAX_RPM = MAX_RPM
        self.MIN_RPM = MIN_RPM
        self.LeftBuffer = LeftBuffer
        self.BottomBuffer = BottomBuffer
        self.Radius = Radius
        self.Point_0 = LeftPoint
        self._create_arc((LeftPoint.x, LeftPoint.y), (LeftPoint.x + 2 * Radius, LeftPoint.y))
        self._rpmGauge()

    def _create_arc(self, p0, p1):
        extend_x = (self._distance(p0, p1) - (p1[0] - p0[0])) / 2
        extend_y = (self._distance(p0, p1) - (p1[1] - p0[1])) / 2
        startAngle = math.atan2(p0[0] - p1[0], p0[1] - p1[1]) * 180 / math.pi
        self.canvas.create_arc(p0[0] - extend_x, p0[1] - extend_y, p1[0] + extend_x, p1[1] + extend_y, extent=180,
                               start=90 + startAngle)
        self.canvas.create_arc(LeftPoint.x + Radius, LeftPoint.y, LeftPoint.x + Radius, LeftPoint.y - Radius)

    def _distance(self, p0, p1):
        return math.sqrt((p0[0] - p1[0]) ** 2 + (p0[1] - p1[1]) ** 2)

    def _rpmGauge(self):
        for x in range(180, 0, -1):
            curTheta = float((math.pi * x) / 180)
            curX = self.CenterPoint.x + (self.Radius * math.cos(curTheta))
            curY = self.CenterPoint.y - (self.Radius * math.sin(curTheta))
            self.line = self.canvas.create_line(self.CenterPoint.x, self.CenterPoint.y, int(curX), int(curY))
            self.canvas.pack()


Radius = 400
acanvas_width = 500
acanvas_height = 600
LeftBuffer = 100
BottomBuffer = 100
CenterPoint = Point(LeftBuffer + Radius, acanvas_height - BottomBuffer)
LeftPoint = Point(LeftBuffer, acanvas_height - BottomBuffer)
MAX_RPM = 8000
MIN_RPM = 0

TACH = TachoMeter(CenterPoint, LeftPoint, Radius, LeftBuffer, BottomBuffer, MIN_RPM, MAX_RPM, acanvas_height,
                  acanvas_width)

TACH.mainloop()

}，假）; };

所以它只是将rangy.saveSelection（）存储在数据库中，然后将其恢复并尝试在其第一个元素上进行rangy.restoreSelection。 console.log看起来不错，但我在控制台中收到错误：

错误：Rangy WrappedRange模块出错：createRange（）：参数必须是Window对象或DOM节点

Answer 1

rangy.saveSelection（）在控制台中显示如下：

{win：undefined，rangeInfos：Array，restored：false}
请注意“win：undefined”
当我将其发送到数据库时，我使用

data：JSON.stringify（{“rangyObject”：rangy.saveSelection（）}）
从数据库中检索它时，它看起来像：

{rangeInfos：Array，restored：false}
请注意，保存到db

我能够使用序列化和反序列化函数来解决这个问题，但是这些函数不会创建带有它们创建的跨度的id，所以我遇到了另一个问题。

错误：Rangy WrappedRange模块中的错误：createRange（）：参数必须是Window对象或DOM节点

1 个答案: