JS实现心电图功能_js心电图资源-CSDN文库

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在JavaScript编程领域，实现心电图（ECG）功能是一项技术挑战，涉及到数据处理、图形渲染和用户交互等多个方面。本文将深入探讨如何利用JavaScript来创建一个能够展示真实心电图数据的应用。我们需要理解心电图的基本原理。心电图是一种记录心脏电活动的图形表示，通过传感器捕捉到的心电信号经过放大后转化为图表，主要由P波、QRS波群和T波组成，分别代表心脏的各个生理阶段。在JavaScript中，我们不直接获取这些生理信号，而是接收到这些信号经过处理后的数字数据。要实现心电图功能，首先需要一个数据源。在这个项目中，数据来源于医疗器材，可能是通过API接口或者直接读取本地存储的CSV或JSON文件。数据通常包含一系列的数值，表示不同时间点的心电信号强度。接着，我们需要一个JavaScript库来绘制心电图。常用的库有Canvas API，它提供了在网页上画图的能力。我们可以创建一个Canvas元素，并使用`canvas.getContext('2d')`获取绘图上下文。然后，通过`beginPath()`、`moveTo()`、`lineTo()`等方法来绘制线条，模拟心电图的波形。为了使心电图看起来更真实，我们还需要考虑线的宽度、颜色和填充。数据处理是关键步骤。由于心电图数据可能以各种格式存在，我们需要对其进行预处理，例如归一化，确保所有的值都在同一范围内。这可以通过计算最大值和最小值，然后将每个数据点除以它们之间的差值来实现。此外，可能还需要平滑数据，消除噪声，这可以通过简单的移动平均算法或更复杂的技术如滤波器实现。为了让心电图动起来，我们需要用到定时器，比如`setInterval`，每隔一定时间间隔（例如每毫秒）就从数据数组中取出一个新的值，更新画布上的线条。同时，为了保持视觉效果的连贯性，可以使用动画技巧，如使用`requestAnimationFrame`，让心电图平滑滚动。除了基本的绘制功能，我们还可以添加交互性，例如鼠标悬停时显示特定时间点的数据，或者允许用户缩放和拖动视图。这需要监听`mousemove`、`mousedown`和`mouseup`等事件，调整Canvas的绘图区域，以及重新绘制心电图。考虑到性能优化，我们应当避免不必要的重绘，只更新变化的部分。可以使用局部更新策略，只修改画布上需要改变的像素，或者在数据量较大时，采用分段渲染的方式。使用JavaScript实现心电图功能涉及数据处理、图形渲染和交互设计等多个环节。通过Canvas API和其他辅助库，结合实际的心电图数据，我们可以创建出一个功能丰富的、动态的心电图展示应用。在实际开发中，还需要考虑兼容性、响应式设计和用户体验等因素，以确保应用在各种设备上都能良好运行。

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Js实现心电图.zip （5个子文件）

Js实现心电图

回放心电图

js心电图演示.html 5KB

wz_jsgraphics.js 23KB

z11111111111111111111111.gif 39KB

JS心电图演示

js心电图演示.html 6KB

wz_jsgraphics.js 23KB

<html> <head> <title>test</title> <script language="javascript" src="wz_jsgraphics.js" type="text/javascript"></script> </head> <body> <input id="butdraw" value="draw" type="button" onclick="get();" /> <div id="testOne" style="color:blue; left: 0px;overflow: visible; width: 600px; position: absolute; ; top: 50px; height: 150px;background:black;float:left;"></div> <div id="testOne1" style="color:blue; left: 0px;overflow: visible; width: 0px; position: absolute; ; top: 50px; height: 150px;background:black;float:left;"></div> <div id="testOne2" style="color:blue; left: 0px;overflow: visible; width: 0px; position:absolute; top: 50px; height: 150px;background:black;float:left; "></div> <div id="testTwo" style="color:blue; left: 0px;overflow: visible; width: 600px; position: absolute; ; top:202px; height: 150px;background:black;float:left;"></div> <div id="testTwo1" style="color:blue; left: 0px;overflow: visible; width: 0px; position: absolute; ; top: 202px; height: 150px;background:black;float:left;"></div> <div id="testTwo2" style="color:blue; left: 0px;overflow: visible; width: 0px; position:absolute; top: 202px; height: 150px;background:black;float:left; "></div> <div id="testThree" style="color:blue; left: 0px;overflow: visible; width: 600px; position: absolute; top:354px; height: 150px;background:black;float:left;"></div> <div id="testThree1" style="color:blue; left: 0px;overflow: visible; width: 0px; position: absolute; top: 354px; height: 150px;background:black;float:left;"></div> <div id="testThree2" style="color:blue; left: 0px;overflow: visible; width: 0px; position:absolute; top: 354px; height: 150px;background:black;float:left; "></div> <div id="testFour" style="color:blue; left: 0px;overflow: visible; width: 600px; position: absolute; top: 506px; height: 150px;background:black;float:left;"></div> <div id="testFour1" style="color:blue; left: 0px;overflow: visible; width: 0px; position: absolute; top: 506px; height: 150px;background:black;float:left;"></div> <div id="testFour2" style="color:blue; left: 0px;overflow: visible; width: 0px; position:absolute;top: 506px; height: 150px;background:black;float:left; "></div> <script type="text/javascript"> var temps = new Array(0x7A, 0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7B,0x7B,0x7B, 0x7B,0x7B,0x7B,0x7A,0x7A,0x7A,0x7B,0x7A,0x7B,0x7B,0x7B,0x7B, 0x7B,0x7B,0x7B,0x7A,0x7A,0x7A,0x7A,0x7A,0x7B,0x7B,0x7B,0x7B, 0x7C,0x7D,0x7E,0x7E,0x7F,0x7F,0x80,0x80,0x80,0x7F,0x7F,0x7E, 0x7E,0x7D,0x7C,0x7C,0x7B,0x7B,0x7B,0x7A,0x7A,0x7B,0x7A,0x7A, 0x7A,0x7A,0x7A,0x7A,0x7A,0x79,0x7A,0x7C,0x80,0x85,0x8B,0x92, 0x96,0x98,0x98,0x95,0x8F,0x89,0x83,0x7D,0x79,0x77,0x76,0x77, 0x79,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A, 0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7B,0x7B,0x7B,0x7B,0x7B,0x7B, 0x7C,0x7C,0x7C,0x7C,0x7D,0x7D,0x7E,0x7E,0x7F,0x7F,0x7F,0x80, 0x80,0x81,0x81,0x82,0x82,0x83,0x83,0x83,0x84,0x84,0x85,0x85, 0x85,0x86,0x86,0x86,0x86,0x86,0x86,0x86,0x86,0x85,0x85,0x84, 0x83,0x83,0x82,0x81,0x80,0x7F,0x7E,0x7E,0x7D,0x7C,0x7C,0x7B, 0x7B,0x7B,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A, 0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A, 0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A, 0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A, 0x7A,0x7A,0x7A,0x7B,0x7B,0x7B,0x7C,0x7D,0x7E,0x7E,0x7F,0x7F, 0x7F,0x80,0x80,0x7F,0x7F,0x7F,0x7E,0x7D,0x7C,0x7C,0x7B,0x7A, 0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7A,0x7B,0x7B,0x7B,0x7B, 0x7B,0x7B,0x7A,0x7A,0x7A,0x7B,0x7A,0x7B,0x7B,0x7B,0x7B,0x7B, 0x7B,0x7B,0x7A,0x7A,0x7A,0x7A,0x7A,0x7B,0x7B,0x7B,0x7C,0x7D, 0x7E,0x7E,0x7F,0x7F,0x80,0x80,0x80,0x7F,0x7F,0x7E,0x7E,0x7D, 0x7C,0x7C,0x7B,0x7B,0x7B,0x7A,0x7A,0x7B,0x7A,0x7A,0x7A,0x7A, 0x7A,0x7A,0x7A,0x79,0x7A,0x7C,0x80,0x85,0x8B,0x92,0x96,0x98, 0x98,0x95,0x8F,0x89,0x83,0x7D,0x79,0x77,0x76,0x77,0x79,0x7A, 0x7A,0x7A); /** *Class 用户网页画图（心电图波形展示 js实现） *Data 20091030 *Author 唐子君 *parameter butdrawDiv为桌布,div1为画图布1,div2为画图布2， **/ function DranClass(butdrawDiv,div1,div2){ var jgOne=new jsGraphics(div1); //画图对象1 var jgTwo=new jsGraphics(div2); //画图对象2 var oldX = 0;//旧X轴 var oldY = 0;//旧Y轴 var newX = 0;//新X轴 var newY = 0;//新Y轴 var cyc = -3;//回转控制变量 var jgOneBool = true;//画图布切换开关 var jgTwoBool = false;//画图布切换开关 this.dran = function(value){ if(jgOneBool){ newX = cyc; //在没有数据时画直线 if(value != null){ newY = value - 50; } //橡皮檫将前面显示的波形刷新 jgOne.setColor("#000000"); jgOne.fillRect(cyc, 0, 20, 150); //画线用于画波形 jgOne.setColor("#99FF66"); jgOne.drawLine(oldX, oldY, newX, newY); jgOne.paint(); oldX = newX; oldY = newY; //在波形走到最后时回转重新开始画 if(cyc > 570){ //控制层之间的显示优先级 document.getElementById(butdrawDiv).style.zIndex = 1; document.getElementById(div1).style.zIndex = 10; document.getElementById(div2).style.zIndex = 20; //清空画图桌布 jgTwo.clear(); //控制桌布切换 jgOneBool = false; jgTwoBool = true; //控制数值转换 oldX = 0; newX = 0; cyc = 0; } }else if(jgTwoBool){ newX = cyc; if(value != null){ newY = value - 50; } jgTwo.setColor("#000000"); jgTwo.fillRect(cyc, 0, 20, 150); jgTwo.setColor("#99FF66"); jgTwo.drawLine(oldX, oldY, newX, newY); jgTwo.paint(); oldX = newX; oldY = newY; if(cyc > 570){ document.getElementById(butdrawDiv).style.zIndex = 1; document.getElementById(div1).style.zIndex = 20; document.getElementById(div2).style.zIndex = 10; jgOne.clear(); jgOneBool = true; jgTwoBool = false; oldX = 0; newX = 0; cyc = 0; } } cyc=cyc+2; } } var i = 0; var a = new DranClass("testOne","testOne1","testOne2"); var a1 = new DranClass("testTwo","testTwo1","testTwo2"); var a2 = new DranClass("testThree","testThree1","testThree2"); var a3 = new DranClass("testFour","testFour1","testFour2"); function get(){ if(i < temps.length){ a.dran(temps[i]); a1.dran(temps[i]); a2.dran(temps[i]); a3.dran(temps[i]); i=i+3; }else{ i = 0; } setTimeout(get,20); } </script> </body> </html>

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