diff --git a/cal.py b/cal.py
new file mode 100644
index 0000000..fa6a3c9
--- /dev/null
+++ b/cal.py
@@ -0,0 +1,555 @@
+# -*- coding: utf-8 -*-
+import os
+import sys
+from demo import *
+from PyQt5.QtGui import QPen, QImage, QCursor
+from PyQt5.QtWidgets import QWidget, QApplication, QFileDialog, \
+    QMainWindow
+from PyQt5.Qt import QPixmap, QPoint, Qt,  QPainter
+from libs.canvas import Canvas
+from libs.tools import line_intersection, str_tuple, norm
+
+
+def read(filename, default=None):
+    try:
+        with open(filename, 'rb') as f:
+            return f.read()
+    except:
+        return default
+
+class ImageBox(QWidget):
+    def __init__(self):
+        super(ImageBox, self).__init__()
+        self.img = None
+        self.scaled_img = None
+        self.start_pos = QPoint(0, 0)
+        self.end_pos = QPoint(0, 0)
+        self.left_click = False
+        self.wheel_flag = False
+
+        self.scale = 1
+        self.old_scale = 1
+        self.point = QPoint(0, 0)
+        self.x = -1
+        self.y = -1
+        self.new_height = -1
+        self.new_width = -1
+
+    def init_ui(self):
+        self.setWindowTitle("ImageBox")
+
+    def set_image(self, img_path):
+        self.img = QPixmap(img_path)
+        print(type(img_path))
+        global path_img
+        path_img = img_path
+        width, height = self.img.width(), self.img.height()
+        if height / width > 1000 / 1800:
+            new_height = 1000
+            new_width = width * 1000 / height
+        else:
+            new_height = height * 1800 / width
+            new_width = 1800
+        self.point = QPoint(int((1800 - new_width) * 0.5), int((1000 - new_height) * 0.5))
+        self.img = self.img.scaled(new_width, new_height, Qt.KeepAspectRatio)
+        self.scaled_img = self.img
+
+        self.new_height = new_height
+        self.new_width = new_width
+        self.scale = 1
+
+    # def set_image(self, img_path):
+    #     self.img = QPixmap(img_path)
+    #     print(type(img_path))
+    #     global path_img
+    #     path_img = img_path
+    #     width, height = self.img.width(), self.img.height()
+    #     if height / width > 990 / 660:
+    #         new_height = 990
+    #         new_width = width * 990 / height
+    #     else:
+    #         new_height = height * 660 / width
+    #         new_width = 660
+    #     self.point = QPoint(int((660 - new_width) * 0.5), int((990 - new_height) * 0.5))
+    #     self.img = self.img.scaled(new_width, new_height, Qt.KeepAspectRatio)
+    #     self.scaled_img = self.img
+    #
+    #     self.new_height = new_height
+    #     self.new_width = new_width
+    #     self.scale = 1
+
+    def paintEvent(self, e):
+        if self.scaled_img:
+            painter = QPainter(self)
+            painter.begin(self)
+            # 设置画笔的颜色, 字体大小, 线的实心样式
+            pen = QPen(Qt.red, 3)
+            painter.setPen(pen)
+            painter.scale(self.scale, self.scale)
+            if self.wheel_flag:  # 定点缩放
+                self.wheel_flag = False
+                # 判断当前鼠标pos在不在图上
+                this_left_x = self.point.x() * self.old_scale
+                this_left_y = self.point.y() * self.old_scale
+                this_scale_width = self.new_width * self.old_scale
+                this_scale_height = self.new_height * self.old_scale
+
+                # 鼠标点在图上，以鼠标点为中心动作
+                gap_x = self.x - this_left_x
+                gap_y = self.y - this_left_y
+                if 0 < gap_x < this_scale_width and 0 < gap_y < this_scale_height:
+                    new_left_x = int(self.x / self.scale - gap_x / self.old_scale)
+                    new_left_y = int(self.y / self.scale - gap_y / self.old_scale)
+                    self.point = QPoint(new_left_x, new_left_y)
+                # 鼠标点不在图上，固定左上角进行缩放
+                else:
+                    true_left_x = int(self.point.x() * self.old_scale / self.scale)
+                    true_left_y = int(self.point.y() * self.old_scale / self.scale)
+                    self.point = QPoint(true_left_x, true_left_y)
+
+            painter2 = QPainter(self.scaled_img)
+            painter2.drawLine(self.start_pos, self.end_pos)
+            # self.start_pos = self.end_pos
+            # painter.drawPoint(self.start_pos)
+            # painter2 = QPainter(self)
+            painter.drawPixmap(0, 0, self.scaled_img)  # 此函数中还会用scale对point进行处理
+
+            painter.end()
+
+    def wheelEvent(self, event):
+        angle = event.angleDelta() / 8  # 返回QPoint对象，为滚轮转过的数值，单位为1/8度
+        angleY = angle.y()
+        self.old_scale = self.scale
+        self.x, self.y = event.x(), event.y()
+        self.wheel_flag = True
+        # 获取当前鼠标相对于view的位置
+        if angleY > 0:
+            self.scale *= 1.08
+        else:  # 滚轮下滚
+            self.scale *= 0.92
+        if self.scale < 0.3:
+            self.scale = 0.3
+        self.adjustSize()
+        self.update()
+
+    def mouseMoveEvent(self, e):
+        if self.left_click:
+            self.end_pos = e.pos()
+            self.update()
+        # if self.left_click:
+        #     self.end_pos = e.pos() - self.start_pos  # 当前位置-起始位置=差值
+        #     self.point = self.point + self.end_pos / self.scale  # 左上角的距离变化
+        #     self.start_pos = e.pos()
+        #     self.repaint()
+
+    def mousePressEvent(self, e):
+        if e.button() == Qt.LeftButton:
+            self.left_click = True
+            self.start_pos = e.pos()
+
+    def mouseReleaseEvent(self, e):
+        if e.button() == Qt.LeftButton:
+            self.left_click = False
+            self.end_pos = e.pos()
+            self.update()
+
+
+class MyWindow(Ui_MainWindow, QMainWindow):
+    def __init__(self):
+        super().__init__()
+        self.height = None
+        self.width = None
+        self.length = None
+        self.setupUi(self)
+        self.init_ui()
+        
+    def init_ui(self):
+        self.canvas = Canvas()
+        self.canvas.zoomRequest.connect(self.zoomRequest)
+        self.scrollArea.setWidget(self.canvas)
+        self.scrollArea.setWidgetResizable(True)
+        self.scrollBars = {
+            Qt.Vertical: self.scrollArea.verticalScrollBar(),
+            Qt.Horizontal: self.scrollArea.horizontalScrollBar()
+        }
+
+        self.adjustZoomSlider.valueChanged.connect(self.adjustZoom)
+
+        self.canvas.scrollRequest.connect(self.scrollRequest)
+
+        self.canvas.newShape.connect(self.newShape)
+        # self.canvas.shapeMoved.connect(self.setDirty)
+        # self.canvas.selectionChanged.connect(self.shapeSelectionChanged)
+        self.canvas.drawingPolygon.connect(self.toggleDrawingSensitive)
+
+        self.canvas.updateData.connect(self.updateData)
+
+        self.itemsToShapes = {}
+        self.shapesToItems = {}
+
+        # Application state.
+        self.image = QImage()
+        self.original_image = QImage()
+
+        self.open_file.clicked.connect(self.open_image)
+
+        self.btn1.clicked.connect(self.push_btn1)
+        self.btn2.clicked.connect(self.push_btn2)
+        self.btn3.clicked.connect(self.push_btn3)
+        self.btn4.clicked.connect(self.push_btn4)
+        self.btn5.clicked.connect(self.push_btn5)
+        self.btn6.clicked.connect(self.push_btn6)
+        self.btn7.clicked.connect(self.push_btn7)
+        self.btn8.clicked.connect(self.push_btn8)
+        self.btn9.clicked.connect(self.push_btn9)
+        self.btn10.clicked.connect(self.push_btn10)
+
+        self.btn_refLen1.clicked.connect(self.ref_len)
+        self.btn_refLen2.clicked.connect(self.ref_width)
+        self.btn_refheight.clicked.connect(self.ref_height)
+
+        self.btn_height.clicked.connect(self.cal_height)
+        self.btn_length.clicked.connect(self.cal_length)
+        self.btn_width.clicked.connect(self.cal_length)
+
+    def open_image(self):
+        try:
+            filename, _ = QFileDialog.getOpenFileName(None, "Open Image File", "", "All Files(*);;*.jpg;;*.png;;*.jpeg")
+            if filename:
+                if isinstance(filename, (tuple, list)):
+                    filename = filename[0]
+                self.loadFile(filename)
+        except Exception as ex:
+            print(ex)
+
+    def adjustZoom(self, value):
+        self.adjustZoomNumLabel.setText(str.format("{value} %", value=value))
+        self.paintCanvas()
+
+    def scrollRequest(self, delta, orientation):
+        units = - delta / (8 * 15)
+        bar = self.scrollBars[orientation]
+        bar.setValue(bar.value() + bar.singleStep() * units)
+
+    def newShape(self):
+        """Pop-up and give focus to the label editor.
+        position MUST be in global coordinates.
+        """
+        self.canvas.setEditing(True)
+
+    def toggleDrawingSensitive(self, drawing=True):
+        """In the middle of drawing, toggling between modes should be disabled."""
+        pass
+
+    def qpoint_tupleStr(self, qpoint):
+        return str((int(qpoint.x()), int(qpoint.y())))
+
+    def zoomRequest(self, delta):
+        # get the current scrollbar positions
+        # calculate the percentages ~ coordinates
+        h_bar = self.scrollBars[Qt.Horizontal]
+        v_bar = self.scrollBars[Qt.Vertical]
+
+        # get the current maximum, to know the difference after zooming
+        h_bar_max = h_bar.maximum()
+        v_bar_max = v_bar.maximum()
+
+        # get the cursor position and canvas size
+        # calculate the desired movement from 0 to 1
+        # where 0 = move left
+        #       1 = move right
+        # up and down analogous
+        cursor = QCursor()
+        pos = cursor.pos()
+        relative_pos = QWidget.mapFromGlobal(self, pos)
+
+        cursor_x = relative_pos.x()
+        cursor_y = relative_pos.y()
+
+        w = self.scrollArea.width()
+        h = self.scrollArea.height()
+
+        # the scaling from 0 to 1 has some padding
+        # you don't have to hit the very leftmost pixel for a maximum-left movement
+        margin = 0.1
+        move_x = (cursor_x - margin * w) / (w - 2 * margin * w)
+        move_y = (cursor_y - margin * h) / (h - 2 * margin * h)
+
+        # clamp the values from 0 to 1
+        move_x = min(max(move_x, 0), 1)
+        move_y = min(max(move_y, 0), 1)
+
+        # get the difference in scrollbar values
+        # this is how far we can move
+        d_h_bar_max = h_bar.maximum() - h_bar_max
+        d_v_bar_max = v_bar.maximum() - v_bar_max
+
+        # get the new scrollbar values
+        new_h_bar_value = h_bar.value() + move_x * d_h_bar_max
+        new_v_bar_value = v_bar.value() + move_y * d_v_bar_max
+
+        h_bar.setValue(new_h_bar_value)
+        v_bar.setValue(new_v_bar_value)
+
+    def resetState(self):
+        self.itemsToShapes.clear()
+        self.shapesToItems.clear()
+        self.canvas.resetState()
+
+    def loadFile(self, filePath=None):
+        """Load the specified file"""
+        self.resetState()
+        self.canvas.setEnabled(False)
+
+        unicodeFilePath = str(filePath)
+
+        if unicodeFilePath and os.path.exists(unicodeFilePath):
+            # Load image:
+            # read data first and store for saving into label file.
+            imageData = read(unicodeFilePath, None)
+            image = QImage.fromData(imageData)
+            self.image = image
+            self.original_image = image
+            pixmap = QPixmap.fromImage(image)
+            self.canvas.loadPixmap(pixmap)
+
+            self.canvas.setEnabled(True)
+            # self.adjustScale()
+            self.paintCanvas()
+            return True
+        return False
+
+    def paintCanvas(self):
+        assert not self.image.isNull(), "cannot paint null image"
+        self.canvas.scale = 0.01 * self.adjustZoomSlider.value()
+        self.canvas.adjustSize()
+        self.canvas.update()
+
+    def updateData(self, x):
+        if x == 1:
+            self.beg1.setText(self.qpoint_tupleStr(self.canvas.shapes[0].points[0]))
+            self.end1.setText(self.qpoint_tupleStr(self.canvas.shapes[0].points[1]))
+        elif x == 2:
+            self.beg1.setText(self.qpoint_tupleStr(self.canvas.shapes[0].points[0]))
+            self.end1.setText(self.qpoint_tupleStr(self.canvas.shapes[0].points[1]))
+
+            self.beg2.setText(self.qpoint_tupleStr(self.canvas.shapes[1].points[0]))
+            self.end2.setText(self.qpoint_tupleStr(self.canvas.shapes[1].points[1]))
+        elif x == 3:
+            self.beg1.setText(self.qpoint_tupleStr(self.canvas.shapes[0].points[0]))
+            self.end1.setText(self.qpoint_tupleStr(self.canvas.shapes[0].points[1]))
+
+            self.beg2.setText(self.qpoint_tupleStr(self.canvas.shapes[1].points[0]))
+            self.end2.setText(self.qpoint_tupleStr(self.canvas.shapes[1].points[1]))
+
+            self.beg3.setText(self.qpoint_tupleStr(self.canvas.shapes[2].points[0]))
+            self.end3.setText(self.qpoint_tupleStr(self.canvas.shapes[2].points[1]))
+        elif x == 4:
+            self.beg1.setText(self.qpoint_tupleStr(self.canvas.shapes[0].points[0]))
+            self.end1.setText(self.qpoint_tupleStr(self.canvas.shapes[0].points[1]))
+
+            self.beg2.setText(self.qpoint_tupleStr(self.canvas.shapes[1].points[0]))
+            self.end2.setText(self.qpoint_tupleStr(self.canvas.shapes[1].points[1]))
+
+            self.beg3.setText(self.qpoint_tupleStr(self.canvas.shapes[2].points[0]))
+            self.end3.setText(self.qpoint_tupleStr(self.canvas.shapes[2].points[1]))
+
+            self.beg4.setText(self.qpoint_tupleStr(self.canvas.shapes[3].points[0]))
+            self.end4.setText(self.qpoint_tupleStr(self.canvas.shapes[3].points[1]))
+        elif x == 5:
+            self.beg1.setText(self.qpoint_tupleStr(self.canvas.shapes[0].points[0]))
+            self.end1.setText(self.qpoint_tupleStr(self.canvas.shapes[0].points[1]))
+
+            self.beg2.setText(self.qpoint_tupleStr(self.canvas.shapes[1].points[0]))
+            self.end2.setText(self.qpoint_tupleStr(self.canvas.shapes[1].points[1]))
+
+            self.beg3.setText(self.qpoint_tupleStr(self.canvas.shapes[2].points[0]))
+            self.end3.setText(self.qpoint_tupleStr(self.canvas.shapes[2].points[1]))
+
+            self.beg4.setText(self.qpoint_tupleStr(self.canvas.shapes[3].points[0]))
+            self.end4.setText(self.qpoint_tupleStr(self.canvas.shapes[3].points[1]))
+
+            self.beg7.setText(self.qpoint_tupleStr(self.canvas.shapes[4].points[0]))
+            self.end7.setText(self.qpoint_tupleStr(self.canvas.shapes[4].points[1]))
+        elif x == 6:
+            self.beg1.setText(self.qpoint_tupleStr(self.canvas.shapes[0].points[0]))
+            self.end1.setText(self.qpoint_tupleStr(self.canvas.shapes[0].points[1]))
+
+            self.beg2.setText(self.qpoint_tupleStr(self.canvas.shapes[1].points[0]))
+            self.end2.setText(self.qpoint_tupleStr(self.canvas.shapes[1].points[1]))
+
+            self.beg3.setText(self.qpoint_tupleStr(self.canvas.shapes[2].points[0]))
+            self.end3.setText(self.qpoint_tupleStr(self.canvas.shapes[2].points[1]))
+
+            self.beg4.setText(self.qpoint_tupleStr(self.canvas.shapes[3].points[0]))
+            self.end4.setText(self.qpoint_tupleStr(self.canvas.shapes[3].points[1]))
+
+            self.beg7.setText(self.qpoint_tupleStr(self.canvas.shapes[4].points[0]))
+            self.end7.setText(self.qpoint_tupleStr(self.canvas.shapes[4].points[1]))
+
+            self.beg8.setText(self.qpoint_tupleStr(self.canvas.shapes[5].points[0]))
+            self.end8.setText(self.qpoint_tupleStr(self.canvas.shapes[5].points[1]))
+        elif x == 7:
+            self.beg1.setText(self.qpoint_tupleStr(self.canvas.shapes[0].points[0]))
+            self.end1.setText(self.qpoint_tupleStr(self.canvas.shapes[0].points[1]))
+
+            self.beg2.setText(self.qpoint_tupleStr(self.canvas.shapes[1].points[0]))
+            self.end2.setText(self.qpoint_tupleStr(self.canvas.shapes[1].points[1]))
+
+            self.beg3.setText(self.qpoint_tupleStr(self.canvas.shapes[2].points[0]))
+            self.end3.setText(self.qpoint_tupleStr(self.canvas.shapes[2].points[1]))
+
+            self.beg4.setText(self.qpoint_tupleStr(self.canvas.shapes[3].points[0]))
+            self.end4.setText(self.qpoint_tupleStr(self.canvas.shapes[3].points[1]))
+
+            self.beg7.setText(self.qpoint_tupleStr(self.canvas.shapes[4].points[0]))
+            self.end7.setText(self.qpoint_tupleStr(self.canvas.shapes[4].points[1]))
+
+            self.beg8.setText(self.qpoint_tupleStr(self.canvas.shapes[5].points[0]))
+            self.end8.setText(self.qpoint_tupleStr(self.canvas.shapes[5].points[1]))
+
+            self.beg5.setText(self.qpoint_tupleStr(self.canvas.shapes[6].points[0]))
+            self.end5.setText(self.qpoint_tupleStr(self.canvas.shapes[6].points[1]))
+        elif x == 8:
+            self.beg1.setText(self.qpoint_tupleStr(self.canvas.shapes[0].points[0]))
+            self.end1.setText(self.qpoint_tupleStr(self.canvas.shapes[0].points[1]))
+
+            self.beg2.setText(self.qpoint_tupleStr(self.canvas.shapes[1].points[0]))
+            self.end2.setText(self.qpoint_tupleStr(self.canvas.shapes[1].points[1]))
+
+            self.beg3.setText(self.qpoint_tupleStr(self.canvas.shapes[2].points[0]))
+            self.end3.setText(self.qpoint_tupleStr(self.canvas.shapes[2].points[1]))
+
+            self.beg4.setText(self.qpoint_tupleStr(self.canvas.shapes[3].points[0]))
+            self.end4.setText(self.qpoint_tupleStr(self.canvas.shapes[3].points[1]))
+
+            self.beg7.setText(self.qpoint_tupleStr(self.canvas.shapes[4].points[0]))
+            self.end7.setText(self.qpoint_tupleStr(self.canvas.shapes[4].points[1]))
+
+            self.beg8.setText(self.qpoint_tupleStr(self.canvas.shapes[5].points[0]))
+            self.end8.setText(self.qpoint_tupleStr(self.canvas.shapes[5].points[1]))
+
+            self.beg5.setText(self.qpoint_tupleStr(self.canvas.shapes[6].points[0]))
+            self.end5.setText(self.qpoint_tupleStr(self.canvas.shapes[6].points[1]))
+
+            self.beg6.setText(self.qpoint_tupleStr(self.canvas.shapes[7].points[0]))
+            self.end6.setText(self.qpoint_tupleStr(self.canvas.shapes[7].points[1]))
+        elif x == 9:
+            self.beg1.setText(self.qpoint_tupleStr(self.canvas.shapes[0].points[0]))
+            self.end1.setText(self.qpoint_tupleStr(self.canvas.shapes[0].points[1]))
+
+            self.beg2.setText(self.qpoint_tupleStr(self.canvas.shapes[1].points[0]))
+            self.end2.setText(self.qpoint_tupleStr(self.canvas.shapes[1].points[1]))
+
+            self.beg3.setText(self.qpoint_tupleStr(self.canvas.shapes[2].points[0]))
+            self.end3.setText(self.qpoint_tupleStr(self.canvas.shapes[2].points[1]))
+
+            self.beg4.setText(self.qpoint_tupleStr(self.canvas.shapes[3].points[0]))
+            self.end4.setText(self.qpoint_tupleStr(self.canvas.shapes[3].points[1]))
+
+            self.beg7.setText(self.qpoint_tupleStr(self.canvas.shapes[4].points[0]))
+            self.end7.setText(self.qpoint_tupleStr(self.canvas.shapes[4].points[1]))
+
+            self.beg8.setText(self.qpoint_tupleStr(self.canvas.shapes[5].points[0]))
+            self.end8.setText(self.qpoint_tupleStr(self.canvas.shapes[5].points[1]))
+
+            self.beg5.setText(self.qpoint_tupleStr(self.canvas.shapes[6].points[0]))
+            self.end5.setText(self.qpoint_tupleStr(self.canvas.shapes[6].points[1]))
+
+            self.beg9.setText(self.qpoint_tupleStr(self.canvas.shapes[8].points[0]))
+            self.end9.setText(self.qpoint_tupleStr(self.canvas.shapes[8].points[1]))
+        elif x == 10:
+            self.beg1.setText(self.qpoint_tupleStr(self.canvas.shapes[0].points[0]))
+            self.end1.setText(self.qpoint_tupleStr(self.canvas.shapes[0].points[1]))
+
+            self.beg2.setText(self.qpoint_tupleStr(self.canvas.shapes[1].points[0]))
+            self.end2.setText(self.qpoint_tupleStr(self.canvas.shapes[1].points[1]))
+
+            self.beg3.setText(self.qpoint_tupleStr(self.canvas.shapes[2].points[0]))
+            self.end3.setText(self.qpoint_tupleStr(self.canvas.shapes[2].points[1]))
+
+            self.beg4.setText(self.qpoint_tupleStr(self.canvas.shapes[3].points[0]))
+            self.end4.setText(self.qpoint_tupleStr(self.canvas.shapes[3].points[1]))
+
+            self.beg7.setText(self.qpoint_tupleStr(self.canvas.shapes[4].points[0]))
+            self.end7.setText(self.qpoint_tupleStr(self.canvas.shapes[4].points[1]))
+
+            self.beg8.setText(self.qpoint_tupleStr(self.canvas.shapes[5].points[0]))
+            self.end8.setText(self.qpoint_tupleStr(self.canvas.shapes[5].points[1]))
+
+            self.beg5.setText(self.qpoint_tupleStr(self.canvas.shapes[6].points[0]))
+            self.end5.setText(self.qpoint_tupleStr(self.canvas.shapes[6].points[1]))
+
+            self.beg9.setText(self.qpoint_tupleStr(self.canvas.shapes[8].points[0]))
+            self.end9.setText(self.qpoint_tupleStr(self.canvas.shapes[8].points[1]))
+
+            self.beg10.setText(self.qpoint_tupleStr(self.canvas.shapes[9].points[0]))
+            self.end10.setText(self.qpoint_tupleStr(self.canvas.shapes[9].points[1]))
+
+    def push_btn1(self):
+        self.canvas.setEditing(False)
+
+    def push_btn2(self):
+        self.canvas.setEditing(False)
+
+    def push_btn3(self):
+        self.canvas.setEditing(False)
+
+    def push_btn4(self):
+        self.canvas.setEditing(False)
+
+    def push_btn5(self):
+        self.canvas.setEditing(False)
+
+    def push_btn6(self):
+        self.canvas.setEditing(False)
+
+    def push_btn7(self):
+        self.canvas.setEditing(False)
+
+    def push_btn8(self):
+        self.canvas.setEditing(False)
+
+    def push_btn9(self):
+        self.canvas.setEditing(False)
+
+    def push_btn10(self):
+        self.canvas.setEditing(False)
+
+    def ref_len(self):
+        self.len = eval(self.refLen1.text())
+
+    def ref_width(self):
+        self.wid = eval(self.refLen2.text())
+
+    def ref_height(self):
+        self.hei = eval(self.refHei.text())
+
+    def cal_height(self):
+        xVanish = line_intersection([str_tuple(self.beg1.text()), str_tuple(self.end1.text())], [str_tuple(self.beg2.text()), str_tuple(self.end2.text())])
+        yVanish = line_intersection([str_tuple(self.beg3.text()), str_tuple(self.end3.text())], [str_tuple(self.beg4.text()), str_tuple(self.end4.text())])
+        zVanish = line_intersection([str_tuple(self.beg7.text()), str_tuple(self.end7.text())], [str_tuple(self.beg8.text()), str_tuple(self.end8.text())])
+
+        vertex = line_intersection([xVanish, yVanish], [str_tuple(self.beg5.text()), str_tuple(self.beg6.text())])
+        bot = str_tuple(self.beg6.text())
+        ref = line_intersection([vertex, str_tuple(self.end5.text())], [str_tuple(self.beg6.text()), str_tuple(self.end6.text())])
+        top = str_tuple(self.end6.text())
+
+        ref_height = self.hei
+
+        height = (norm(top, bot)/norm(ref, bot))*(norm(zVanish, ref)/norm(zVanish, top))*ref_height
+
+        self.height.setText(str(height))
+
+    def cal_length(self):
+        pass
+
+if __name__ == '__main__':
+    app = QApplication(sys.argv)
+
+    w = MyWindow()
+
+    w.show()
+
+    app.exec()
+