diff --git a/.settings/org.eclipse.core.resources.prefs b/.settings/org.eclipse.core.resources.prefs
index 4bfe9d2..b5aaf85 100644
--- a/.settings/org.eclipse.core.resources.prefs
+++ b/.settings/org.eclipse.core.resources.prefs
@@ -1,5 +1,6 @@
 eclipse.preferences.version=1
 encoding//Demo/AutoRestart.py=utf-8
+encoding//Demo/CircleLine.py=utf-8
 encoding//Demo/EmbedWindow.py=utf-8
 encoding//Demo/FacePoints.py=utf-8
 encoding//Demo/FollowWindow.py=utf-8
@@ -20,6 +21,7 @@ encoding//QChart/LineChart.py=utf-8
 encoding//QFont/AwesomeFont.py=utf-8
 encoding//QFont/Lib/FontAwesome.py=utf-8
 encoding//QGraphicsDropShadowEffect/ShadowEffect.py=utf-8
+encoding//QGraphicsView/WorldMap.py=utf-8
 encoding//QListView/CustomWidgetSortItem.py=utf-8
 encoding//QListView/SortItemByRole.py=utf-8
 encoding//QMessageBox/CustomColorIcon.py=utf-8
diff --git a/Demo/CircleLine.py b/Demo/CircleLine.py
new file mode 100644
index 0000000..76fe4ee
--- /dev/null
+++ b/Demo/CircleLine.py
@@ -0,0 +1,262 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Created on 2019年3月19日
+@author: Irony
+@site: https://pyqt5.com https://github.com/892768447
+@email: 892768447@qq.com
+@file: CircleLine
+@description: 
+"""
+
+from math import floor, pi, cos, sin
+from random import random, randint
+from time import time
+
+from PyQt5.QtCore import QTimer, Qt
+from PyQt5.QtGui import QColor, QPainter, QPainterPath, QPen
+from PyQt5.QtWidgets import QWidget
+
+
+__Author__ = 'Irony'
+__Copyright__ = 'Copyright (c) 2019'
+
+# 最小和最大半径、半径阈值和填充圆的百分比
+radMin = 10
+radMax = 80
+filledCircle = 30  # 填充圆的百分比
+concentricCircle = 60  # 同心圆百分比
+radThreshold = 25  # IFF special, over this radius concentric, otherwise filled
+# 最小和最大移动速度
+speedMin = 0.3
+speedMax = 0.6
+# 每个圆和模糊效果的最大透明度
+maxOpacity = 0.6
+
+colors = [
+    QColor(52, 168, 83),
+    QColor(117, 95, 147),
+    QColor(199, 108, 23),
+    QColor(194, 62, 55),
+    QColor(0, 172, 212),
+    QColor(120, 120, 120)
+]
+circleBorder = 10
+backgroundLine = colors[0]
+backgroundColor = QColor(38, 43, 46)
+backgroundMlt = 0.85
+
+lineBorder = 2.5
+
+# 最重要的是：包含它们的整个圆和数组的数目
+maxCircles = 8
+points = []
+
+# 实验变量
+circleExp = 1
+circleExpMax = 1.003
+circleExpMin = 0.997
+circleExpSp = 0.00004
+circlePulse = False
+
+# 生成随机整数 a<=x<=b
+
+
+def randint(a, b):
+    return floor(random() * (b - a + 1) + a)
+
+# 生成随机小数
+
+
+def randRange(a, b):
+    return random() * (b - a) + a
+
+# 生成接近a的随机小数
+
+
+def hyperRange(a, b):
+    return random() * random() * random() * (b - a) + a
+
+
+class Circle:
+
+    def __init__(self, background, width, height):
+        self.background = background
+        self.x = randRange(-width / 2, width / 2)
+        self.y = randRange(-height / 2, height / 2)
+        self.radius = hyperRange(radMin, radMax)
+        self.filled = (False if randint(
+            0, 100) > concentricCircle else 'full') if self.radius < radThreshold else (
+                False if randint(0, 100) > concentricCircle else 'concentric')
+        self.color = colors[randint(0, len(colors) - 1)]
+        self.borderColor = colors[randint(0, len(colors) - 1)]
+        self.opacity = 0.05
+        self.speed = randRange(speedMin, speedMax)  # * (radMin / self.radius)
+        self.speedAngle = random() * 2 * pi
+        self.speedx = cos(self.speedAngle) * self.speed
+        self.speedy = sin(self.speedAngle) * self.speed
+        spacex = abs((self.x - (-1 if self.speedx < 0 else 1) *
+                      (width / 2 + self.radius)) / self.speedx)
+        spacey = abs((self.y - (-1 if self.speedy < 0 else 1) *
+                      (height / 2 + self.radius)) / self.speedy)
+        self.ttl = min(spacex, spacey)
+
+
+class CircleLineWindow(QWidget):
+
+    def __init__(self, *args, **kwargs):
+        super(CircleLineWindow, self).__init__(*args, **kwargs)
+        geometry = QApplication.instance().desktop().availableGeometry()
+        self.screenWidth = geometry.width()
+        self.screenHeight = geometry.height()
+        self._canDraw = True
+        self._firstDraw = True
+        self._timer = QTimer(self, timeout=self.update)
+
+    def init(self):
+        points.clear()
+        # 链接的最小距离
+        self.linkDist = min(self.screenWidth, self.screenHeight) / 2.4
+        # 初始化点
+        for _ in range(maxCircles * 3):
+            points.append(Circle('', self.screenWidth, self.screenHeight))
+        self.update()
+
+    def resizeEvent(self, event):
+        super(CircleLineWindow, self).resizeEvent(event)
+        self.init()
+
+    def showEvent(self, event):
+        super(CircleLineWindow, self).showEvent(event)
+        self._canDraw = True
+
+    def hideEvent(self, event):
+        super(CircleLineWindow, self).hideEvent(event)
+        # 窗口最小化要停止绘制, 减少cpu占用
+        self._canDraw = False
+
+    def paintEvent(self, event):
+        super(CircleLineWindow, self).paintEvent(event)
+        if not self._canDraw:
+            return
+        painter = QPainter(self)
+        painter.setRenderHint(QPainter.Antialiasing)
+        painter.setRenderHint(QPainter.SmoothPixmapTransform)
+        painter.save()
+        painter.fillRect(self.rect(), backgroundColor)
+        painter.restore()
+        self.draw(painter)
+
+    def draw(self, painter):
+        if circlePulse:
+            if circleExp < circleExpMin or circleExp > circleExpMax:
+                circleExpSp *= -1
+            circleExp += circleExpSp
+
+        painter.translate(self.screenWidth / 2, self.screenHeight / 2)
+
+        if self._firstDraw:
+            t = time()
+        self.renderPoints(painter, points)
+        if self._firstDraw:
+            self._firstDraw = False
+            # 此处有个比例关系用于设置timer的时间，如果初始窗口很小，没有比例会导致动画很快
+            t = (time() - t) * 1000
+            # 比例最大不能超过1920/800
+            t = int(min(2.4, self.screenHeight / self.height()) * t) - 1
+            print('start timer(%d msec)' % t)
+            # 开启定时器
+            self._timer.start(t)
+
+    def drawCircle(self, painter, circle):
+        #         circle.radius *= circleExp
+        if circle.background:
+            circle.radius *= circleExp
+        else:
+            circle.radius /= circleExp
+        radius = circle.radius
+
+        r = radius * circleExp
+        # 边框颜色设置透明度
+        c = QColor(circle.borderColor)
+        c.setAlphaF(circle.opacity)
+
+        painter.save()
+        if circle.filled == 'full':
+            # 设置背景刷
+            painter.setBrush(c)
+            painter.setPen(Qt.NoPen)
+        else:
+            # 设置画笔
+            painter.setPen(
+                QPen(c, max(1, circleBorder * (radMin - circle.radius) / (radMin - radMax))))
+
+        # 画实心圆或者圆圈
+        painter.drawEllipse(circle.x - r, circle.y - r, 2 * r, 2 * r)
+        painter.restore()
+
+        if circle.filled == 'concentric':
+            r = radius / 2
+            # 画圆圈
+            painter.save()
+            painter.setBrush(Qt.NoBrush)
+            painter.setPen(
+                QPen(c, max(1, circleBorder * (radMin - circle.radius) / (radMin - radMax))))
+            painter.drawEllipse(circle.x - r, circle.y - r, 2 * r, 2 * r)
+            painter.restore()
+
+        circle.x += circle.speedx
+        circle.y += circle.speedy
+        if (circle.opacity < maxOpacity):
+            circle.opacity += 0.01
+        circle.ttl -= 1
+
+    def renderPoints(self, painter, circles):
+        for i, circle in enumerate(circles):
+            if circle.ttl < -20:
+                # 重新初始化一个
+                circle = Circle('', self.screenWidth, self.screenHeight)
+                circles[i] = circle
+            self.drawCircle(painter, circle)
+
+        circles_len = len(circles)
+        for i in range(circles_len - 1):
+            for j in range(i + 1, circles_len):
+                deltax = circles[i].x - circles[j].x
+                deltay = circles[i].y - circles[j].y
+                dist = pow(pow(deltax, 2) + pow(deltay, 2), 0.5)
+                # if the circles are overlapping, no laser connecting them
+                if dist <= circles[i].radius + circles[j].radius:
+                    continue
+                # otherwise we connect them only if the dist is < linkDist
+                if dist < self.linkDist:
+                    xi = (1 if circles[i].x < circles[j].x else -
+                          1) * abs(circles[i].radius * deltax / dist)
+                    yi = (1 if circles[i].y < circles[j].y else -
+                          1) * abs(circles[i].radius * deltay / dist)
+                    xj = (-1 if circles[i].x < circles[j].x else 1) * \
+                        abs(circles[j].radius * deltax / dist)
+                    yj = (-1 if circles[i].y < circles[j].y else 1) * \
+                        abs(circles[j].radius * deltay / dist)
+                    path = QPainterPath()
+                    path.moveTo(circles[i].x + xi, circles[i].y + yi)
+                    path.lineTo(circles[j].x + xj, circles[j].y + yj)
+#                     samecolor = circles[i].color == circles[j].color
+                    c = QColor(circles[i].borderColor)
+                    c.setAlphaF(min(circles[i].opacity, circles[j].opacity)
+                                * ((self.linkDist - dist) / self.linkDist))
+                    painter.setPen(QPen(c, (
+                        lineBorder * backgroundMlt if circles[i].background else lineBorder) * (
+                        (self.linkDist - dist) / self.linkDist)))
+                    painter.drawPath(path)
+
+
+if __name__ == '__main__':
+    import sys
+    from PyQt5.QtWidgets import QApplication
+    app = QApplication(sys.argv)
+    w = CircleLineWindow()
+    w.resize(800, 600)
+    w.show()
+    sys.exit(app.exec_())
diff --git a/Demo/Data/背景连线动画.html b/Demo/Data/背景连线动画.html
new file mode 100644
index 0000000..e6d25d7
--- /dev/null
+++ b/Demo/Data/背景连线动画.html
@@ -0,0 +1,208 @@
+<!DOCTYPE html>
+<html>
+    <head>
+        <meta charset="utf-8">
+        <title>背景连线动画</title>
+        <style>
+            html,
+            body {
+            overflow: hidden;
+            background: #262b2e
+            }
+            #canvas {
+            z-index: 1;
+            }
+        </style>
+    </head>
+    <body>
+        <div id="wrapper">
+            <canvas id="canvas" width="1920px" height="1080px"></canvas>
+        </div>
+        <script>
+            // min and max radius, radius threshold and percentage of filled circles
+            var radMin = 10,
+                radMax = 80,
+                filledCircle = 30, //percentage of filled circles
+                concentricCircle = 60, //percentage of concentric circles
+                radThreshold = 25; //IFF special, over this radius concentric, otherwise filled
+            
+            //min and max speed to move
+            var speedMin = 0.3,
+                speedMax = 0.6;
+            
+            //max reachable opacity for every circle and blur effect
+            var maxOpacity = 0.6;
+            
+            //default palette choice
+            var colors = ['52,168,83', '117,95,147', '199,108,23', '194,62,55', '0,172,212', '120,120,120'],
+                circleBorder = 10,
+                backgroundLine = colors[0];
+            var backgroundMlt = 0.85;
+            
+            //min distance for links
+            var linkDist = Math.min(canvas.width, canvas.height) / 2.4,
+                lineBorder = 2.5;
+            
+            //most importantly: number of overall circles and arrays containing them
+            var maxCircles = 8;
+            var points = [];
+            
+            
+            //experimental vars
+            var circleExp = 1,
+                circleExpMax = 1.003,
+                circleExpMin = 0.997,
+                circleExpSp = 0.00004,
+                circlePulse = false;
+            	
+            var ctxfr = null;
+            //circle class
+            function Circle(background) {
+                this.x = randRange(-canvas.width / 2, canvas.width / 2);
+                this.y = randRange(-canvas.height / 2, canvas.height / 2);
+                this.radius = hyperRange(radMin, radMax);
+                this.filled = this.radius < radThreshold ? (randint(0, 100) > filledCircle ? false : 'full') : (randint(0, 100) > concentricCircle ? false : 'concentric');
+                this.color = colors[randint(0, colors.length - 1)];
+                this.borderColor = colors[randint(0, colors.length - 1)];
+                this.opacity = 0.05;
+                this.speed = randRange(speedMin, speedMax); // * (radMin / this.radius);
+                this.speedAngle = Math.random() * 2 * Math.PI;
+                this.speedx = Math.cos(this.speedAngle) * this.speed;
+                this.speedy = Math.sin(this.speedAngle) * this.speed;
+                var spacex = Math.abs((this.x - (this.speedx < 0 ? -1 : 1) * (canvas.width / 2 + this.radius)) / this.speedx),
+                    spacey = Math.abs((this.y - (this.speedy < 0 ? -1 : 1) * (canvas.height / 2 + this.radius)) / this.speedy);
+            
+                this.ttl = Math.min(spacex, spacey);
+            }
+            
+            Circle.prototype.init = function() {
+                Circle.call(this, this.background);
+            };
+            
+            //support functions
+            //generate random int a<=x<=b
+            function randint(a, b) {
+                return Math.floor(Math.random() * (b - a + 1) + a);
+            }
+            //generate random float
+            function randRange(a, b) {
+                return Math.random() * (b - a) + a;
+            }
+            //generate random float more likely to be close to a
+            function hyperRange(a, b) {
+                return Math.random() * Math.random() * Math.random() * (b - a) + a;
+            }
+            
+            //rendering function
+            function drawCircle(ctx, circle) {
+                //circle.radius *= circleExp;
+                var radius = circle.background ? circle.radius *= circleExp : circle.radius /= circleExp;
+                ctx.beginPath();
+                ctx.arc(circle.x, circle.y, radius * circleExp, 0, 2 * Math.PI, false);
+                ctx.lineWidth = Math.max(1, circleBorder * (radMin - circle.radius) / (radMin - radMax));
+                ctx.strokeStyle = ['rgba(', circle.borderColor, ',', circle.opacity, ')'].join('');
+                if (circle.filled === 'full') {
+                    ctx.fillStyle = ['rgba(', circle.borderColor, ',', circle.opacity, ')'].join('');
+                    ctx.fill();
+                    ctx.lineWidth=0;
+                    ctx.strokeStyle = ['rgba(', circle.borderColor, ',', 0, ')'].join('');
+                }
+                ctx.stroke();
+                if (circle.filled === 'concentric') {
+                    ctx.beginPath();
+                    ctx.arc(circle.x, circle.y, radius / 2, 0, 2 * Math.PI, false);
+                    ctx.lineWidth = Math.max(1, circleBorder * (radMin - circle.radius) / (radMin - radMax));
+                    ctx.strokeStyle = ['rgba(', circle.color, ',', circle.opacity, ')'].join('');
+                    ctx.stroke();
+                }
+                circle.x += circle.speedx;
+                circle.y += circle.speedy;
+                if (circle.opacity < maxOpacity) circle.opacity += 0.01;
+                circle.ttl--;
+            }
+            
+            //initializing function
+            function init() {
+            
+                var canvas1 = document.getElementById('canvas');
+                canvas1.width = document.documentElement.clientWidth;
+                canvas1.height = document.documentElement.clientHeight;
+                ctxfr = document.getElementById('canvas').getContext('2d');
+                ctxfr.globalCompositeOperation = 'destination-over';   
+                //populating the screen
+                for (var i = 0; i < maxCircles * 2; i++) points.push(new Circle(false));
+            	
+                window.requestAnimationFrame(draw);
+            }
+            
+            //rendering function
+            function draw() {
+                if (circlePulse) {
+                    if (circleExp < circleExpMin || circleExp > circleExpMax) circleExpSp *= -1;
+                    circleExp += circleExpSp;
+                }
+            
+                ctxfr.clearRect(0, 0, canvas.width, canvas.height); // clear canvas
+                ctxfr.save();
+                ctxfr.translate(canvas.width / 2, canvas.height / 2);
+            
+            
+                //function to render each single circle, its connections and to manage its out of boundaries replacement
+                function renderPoints(ctx, arr) {
+                    for (var i = 0; i < arr.length; i++) {
+                        var circle = arr[i];
+                        //checking if out of boundaries
+                        if (circle.ttl<0) {}
+                        var xEscape = canvas.width / 2 + circle.radius,
+                            yEscape = canvas.height / 2 + circle.radius;
+                        if (circle.ttl < -20) arr[i].init(arr[i].background);
+                        //if (Math.abs(circle.y) > yEscape || Math.abs(circle.x) > xEscape) arr[i].init(arr[i].background);
+                        drawCircle(ctx, circle);
+                    }
+                    for (var i = 0; i < arr.length - 1; i++) {
+                        for (var j = i + 1; j < arr.length; j++) {
+                            var deltax = arr[i].x - arr[j].x;
+                            var deltay = arr[i].y - arr[j].y;
+                            var dist = Math.pow(Math.pow(deltax, 2) + Math.pow(deltay, 2), 0.5);
+                            //if the circles are overlapping, no laser connecting them
+                            if (dist <= arr[i].radius + arr[j].radius) continue;
+                            //otherwise we connect them only if the dist is < linkDist
+                            if (dist < linkDist) {
+                                var xi = (arr[i].x < arr[j].x ? 1 : -1) * Math.abs(arr[i].radius * deltax / dist);
+                                var yi = (arr[i].y < arr[j].y ? 1 : -1) * Math.abs(arr[i].radius * deltay / dist);
+                                var xj = (arr[i].x < arr[j].x ? -1 : 1) * Math.abs(arr[j].radius * deltax / dist);
+                                var yj = (arr[i].y < arr[j].y ? -1 : 1) * Math.abs(arr[j].radius * deltay / dist);
+                                ctx.beginPath();
+                                ctx.moveTo(arr[i].x + xi, arr[i].y + yi);
+                                ctx.lineTo(arr[j].x + xj, arr[j].y + yj);
+                                var samecolor = arr[i].color == arr[j].color;
+                                ctx.strokeStyle = ["rgba(", arr[i].borderColor, ",", Math.min(arr[i].opacity, arr[j].opacity) * ((linkDist - dist) / linkDist), ")"].join("");
+                                ctx.lineWidth = (arr[i].background ? lineBorder * backgroundMlt : lineBorder) * ((linkDist - dist) / linkDist); //*((linkDist-dist)/linkDist);
+                                ctx.stroke();
+                            }
+                        }
+                    }
+                }
+            
+                var startTime = Date.now();
+                renderPoints(ctxfr, points);
+            
+                deltaT = Date.now() - startTime;
+                ctxfr.restore();
+            
+                window.requestAnimationFrame(draw);
+            }
+            
+            init();
+            
+            
+            
+            
+            /*Credits and aknowledgements:
+            Original Idea and Design by Luca Luzzatti
+            
+            Optimizing tips from Benjamin K?stner
+            General tips from Salvatore Previti*/
+        </script>
+    </body>
+</html>
diff --git a/Demo/README.md b/Demo/README.md
index 6b203bc..c983c2f 100644
--- a/Demo/README.md
+++ b/Demo/README.md
@@ -16,6 +16,7 @@
   - [验证码控件](#14、验证码控件)
   - [人脸特征点](#15、人脸特征点)
   - [使用Threading](#16、使用Threading)
+  - [背景连线动画](#17、背景连线动画)
 
 ## 1、重启窗口Widget
 [运行 RestartWindow.py](RestartWindow.py)
@@ -162,4 +163,11 @@ PyQt 结合 Opencv 进行人脸检测；
 
 在PyQt中使用Theading线程
 
-![QtThreading](ScreenShot/QtThreading.gif)
\ No newline at end of file
+![QtThreading](ScreenShot/QtThreading.gif)
+
+## 17、背景连线动画
+[运行 CircleLine.py](CircleLine.py)
+
+主要参考 [背景连线动画.html](Data/背景连线动画.html)
+
+![CircleLine](ScreenShot/CircleLine.gif)
\ No newline at end of file
diff --git a/Demo/ScreenShot/CircleLine.gif b/Demo/ScreenShot/CircleLine.gif
new file mode 100644
index 0000000..4672973
Binary files /dev/null and b/Demo/ScreenShot/CircleLine.gif differ
diff --git a/README.md b/README.md
index c6851f8..8f9f04a 100644
--- a/README.md
+++ b/README.md
@@ -171,6 +171,7 @@ https://pyqt5.com 社区是专门针对PyQt5学习和提升开设的博客网站
   - [验证码控件](Demo/VerificationCode.py)
   - [人脸特征点](Demo/FacePoints.py)
   - [使用Threading](Demo/QtThreading.py)
+  - [背景连线动画](Demo/CircleLine.py)
 
 # QQ群