如何绘制实时flot的线
本文关键字：实时 flot 的线 绘制 何绘制 | 更新日期: 2023-09-27 18:27:10
从这里开始：如何在实时浮点图中显示Json随机数？，我设法在漂浮图上显示了一个随机数字。x轴是当前时间的秒。我的问题是，现在我的图表上只显示了一个点（当前值）。我想要的是根据随机数的值显示一条实时线。我怎么能这么做？我希望我能让别人理解我自己。这是我的鳕鱼：
在C#中：
if (method == "rnd")
{
//Current second
this.Page.Response.ContentType = "application/json1";
DateTime now = DateTime.Now;
int sec = now.Second;
Random rnd = new Random();
int nr = rnd.Next(1, 100); // creates a number between 1 and 99
var str = "{'"sec'":" + sec.ToString() + ",'"val'":" + nr.ToString() + "}";
var json2 = new JavaScriptSerializer().Serialize(str);
this.Page.Response.Write(json2);
}
我的ASP页面：
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="MultiTrenduri.aspx.cs" Inherits="WebApplication2.MultiTrenduri" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script src="Scripts/jquery-1.8.3.min.js"></script>
<script src="Scripts/flot/jquery.flot.min.js"></script>
<script src="Scripts/flot/jquery.flot.time.js"></script>
<script src="Scripts/flot/jquery.flot.symbol.js"></script>
<script src="Scripts/flot/hashtable.js"></script>
<script src="Scripts/flot/jquery.flot.axislabels.js"></script>
<script src="Scripts/flot/jquery.numberformatter-1.2.3.min.js"></script>
<link href="Flot/examples.css" rel="stylesheet" />
<script type="text/javascript">
var sc = [], num = [];
function test2() {
$.ajax({
type: 'POST',
url: ('ajax.aspx?meth=') + "rnd",
contentType: 'application/json2; charset=utf-8',
dataType: 'json',
async: true,
cache: false,
global: false,
timeout: 120000,
success: function (data, textStatus, jqXHR) {
var obj = jQuery.parseJSON(data);
$('#azi').html(obj.sec);
$('#nr').html(obj.val);
var sc = [], num = [];
sc.push(obj.sec);
num.push(obj.val);
data = [[[sc, num]]];
//var afis = [[[data]]];
//$('#afs').text(afis.join(" * "));
//show the data in a list in body
var items = [];
$.each(data, function (key, val1) {
items.push("<li><a href=#'" + key + "'>" + val1 + "</a></li>");
});
$( "<ul/>", {
"class": "my-new-list",
html: items.join( "" )
}).appendTo( "body" );
//START: PLOT IN TIMP REAL
$(function () {
var plot = $.plot("#placeholder", data,
{
series: {
shadowSize: 0 // Drawing is faster without shadows
},
points: { show: true },
line: { show: true },
yaxis: {
min: 0,
max: 100
},
xaxis: {
show: true
}
});
// plot.setData(data); //to reset data
// plot.draw(); //to redraw chart
});
// plot.draw();
//END: PLOT IN TIMP REAL
},
error: function (jqXHR, textStatus, errorThrown) {
window.alert(errorThrown);
}
});
}
window.setInterval(test2, 1000);
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<div id="azi"></div>
<div id="nr"></div>
<div class="demo-container">
<div id="placeholder" class="demo-placeholder">
</div>
</div>
</div>
</form>
</body>
</html>
也许有人也需要这样做。我就是这样做到的。
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<script src="Scripts/jquery-1.8.3.min.js"></script>
<script src="Scripts/flot/jquery.flot.min.js"></script>
<script src="Scripts/flot/jquery.flot.time.js"></script>
<script src="Scripts/flot/jquery.flot.symbol.js"></script>
<script src="Scripts/flot/hashtable.js"></script>
<script src="Scripts/flot/jquery.flot.axislabels.js"></script>
<script src="Scripts/flot/jquery.numberformatter-1.2.3.min.js"></script>
<link href="Flot/examples.css" rel="stylesheet" />
<%-- Library for TOOLTIP:--%>
<script src="Scripts/flot/jquery.flot.crosshair.js"></script>
<!-- CSS -->
<%--<style type="text/css">
#placeholder {
width: 1000px;
height: 500px;
text-align: center;
margin: 0 auto;
}
</style>--%>
<%-- <link href="Flot/examples.css" rel="stylesheet" />--%>
<%-- <script src="Scripts/jquery-1.4.1.js"></script>
<script src="Scripts/flot/jquery.flot.js"></script>--%>
<script type="text/javascript">
var sc = [], num = [];
var data = [];
var dataset;
var totalPoints = 100;
var updateInterval=30 ;
var now = new Date().getTime();
var t;
var multipleCalls, multCalls;
var input = document.getElementById('input');
var st;
/* window.onload = function f1() {
document.getElementById('updateInterval').value = 90;
}
function f2() {
// document.getElementById('up2').value = document.getElementById('up1').value
var updateInterval = document.getElementById('updateInterval').value;
// window.alert(updateInterval);
}*/
$(function () {
function test2() {
$.ajax({
type: 'GET',
url: ('ajax.aspx?meth=') + "rnd",
contentType: 'application/json2; charset=utf-8',
dataType: 'json',
//async: true,
//cache: false,
//global: false,
// timeout: 120000,
success: function (data, textStatus, jqXHR) {
var obj = jQuery.parseJSON(data);
$('#azi').html(obj.sec);
$('#nr').html(obj.val);
t = obj.val;
},
error: function (jqXHR, textStatus, errorThrown) {
window.alert(errorThrown);
}
});
}
function apel() {
test2();
$('#fn').html(t);
updateInterval = document.getElementById('updateInterval').value;
}
function GetData() {
data.shift();
data.slice(1);
while (data.length < totalPoints) {
// var y = Math.random() * 100;
var y = t;
var temp = [now += updateInterval, y];
data.push(temp);
}
}
$("#up").val(updateInterval).change(function () {
var vv = $(this).val();
if (vv && !isNaN(+vv)) {
updateInterval = +vv;
if (updateInterval < 1) {
updateInterval = 1;
} else if (updateInterval > 2000) {
updateInterval = 2000;
}
$(this).val("" + updateInterval);
}
});
var options = {
series: {
lines: {
show: true,
lineWidth: 1.2,
fill: false
}
},
xaxis: {
mode: "time",
tickSize: [2, "second"],
tickFormatter: function (v, axis) {
var date = new Date(v);
if (date.getSeconds() % 5 == 0) {
var hours = date.getHours() < 10 ? "0" + date.getHours() : date.getHours();
var minutes = date.getMinutes() < 10 ? "0" + date.getMinutes() : date.getMinutes();
var seconds = date.getSeconds() < 10 ? "0" + date.getSeconds() : date.getSeconds();
var w = hours + ":" + minutes + ":" + seconds;
return w;
} else {
return "";
}
},
axisLabel: "Time",
axisLabelUseCanvas: true,
axisLabelFontSizePixels: 12,
axisLabelFontFamily: 'Verdana, Arial',
axisLabelPadding: 10
},
grid: {
hoverable: true,
clickable: true
},
yaxis: {
min: 0,
max: 100,
tickSize: 5,
tickFormatter: function (v, axis) {
if (v % 10 == 0) {
return v + "%";
} else {
return "";
}
},
axisLabel: "CPU loading",
axisLabelUseCanvas: true,
axisLabelFontSizePixels: 12,
axisLabelFontFamily: 'Verdana, Arial',
axisLabelPadding: 6
},
legend: {
labelBoxBorderColor: "#fff"
}
};
//START TOOLTIP
/* $("#placeholder").bind("plothover", function (event, pos, item) {
if ($("#enablePosition:checked").length > 0) {
var str = "(" + pos.x.toFixed(2) + ", " + pos.y.toFixed(2) + ")";
$("#hoverdata").text(str);
}
if ($("#enableTooltip:checked").length > 0) {
if (item) {
var x = item.datapoint[0].toFixed(2),
y = item.datapoint[1].toFixed(2);
$("#tooltip").html(item.series.label + " of " + x + " = " + y)
.css({ top: item.pageY + 5, left: item.pageX + 5 })
.fadeIn(200);
} else {
$("#tooltip").hide();
}
}
});
$("#placeholder").bind("plotclick", function (event, pos, item) {
if (item) {
$("#clickdata").text(" - click point " + item.dataIndex + " in " + item.series.label);
plot.highlight(item.series, item.datapoint);
}
});
*/
//END TOOLTIP
st = $(document).ready(function f1() {
test2();
GetData();
dataset = [
{ label: "CPU", data: data }
];
$.plot($("#placeholder"), dataset, options);
function stop() {
//window.alert("Stop");
//multipleCalls.clearTimeout();
window.clearTimeout(updateInterval);
}
function update() {
test2();
GetData();
$.plot($("#placeholder"), dataset, options)
multipleCalls = setTimeout(update, updateInterval);
multCalls = multipleCalls;
}
update();
});
});
</script>
</head>
<body>
//Stops the graph
<button onclick="clearInterval(multipleCalls)">Stop</button>
<div id="header">
<div id="azi"></div>
<div id="nr"></div>
</div>
<div id="content">
<div class="demo-container">
<div id="placeholder" class="demo-placeholder"></div>
</div>
<p>Time between updates: <input id="up" type="text" value="" style="text-align: right; width:5em"/> milliseconds</p>
</div>
</body>
</html>