PHP uses Jpgraph to create a line chart effect example

This article mainly introduces the effect of using Jpgraph to create a line chart in PHP, and analyzes the principles, implementation steps and related operating techniques of using Jpgraph in PHP to draw a line chart in the form of examples. Friends in need can refer to the following

The example in this article describes the use of Jpgraph in PHP to create a line chart effect. Share it with everyone for your reference, the details are as follows:

In business operations, it is often necessary to collect statistics on various data. Using charts to dynamically analyze the data in different data tables can make the data display more intuitive.

Example: Apply Jpgraph technology to draw a line chart containing two book sales trends.

In order to use the function of Jpgraph, first import the Jpgraph class library in the program, then create two arrays to represent the annual sales of the two books, create an object of the Graph class, and use the created array as a parameter to create Two objects of LinePlot class. Set parameters such as title, scale, background color, and line color of the statistical chart, and add two LinePlot objects to the statistical chart object.

The process is as follows:

(1) Import the Jpgraph class library and straight line drawing function into the program.

require_once 'jpgraph/src/jpgraph.php';
require_once 'jpgraph/src/jpgraph_line.php';

(2) Create statistical data and save it to a one-dimensional array.

$data1 = array(89, 78, 99, 65, 92, 85, 85, 55, 64, 79, 85, 98);//设置统计数据
$data2 = array(68, 70, 69, 80, 50, 60, 75, 65, 75, 65, 80, 89);//设置统计数据

(3) Create a statistical chart object and set the scale style of the coordinates

$graph = new Graph(600, 300);//创建统计图对象
$graph->SetScale('textlin');//设置刻度样式
$graph->SetY2Scale('lin');
$graph->SetShadow();//设置背景带阴影
$graph->img->SetMargin(40, 50, 20, 70);// 设置图表灰度四周边距，顺序为左右上下
$graph->title->Set(iconv('utf-8', 'GB2312//IGNORE', '图书销售走势表'));//设置走势图的标题

(4) Create a LinePlot object and add the created object to the object of the statistical chart.

$lineplot1 = new LinePlot($data1);//建立LinePlot对象
$lineplot2 = new LinePlot($data2);//建立LinePlot对象
$graph->Add($lineplot1);
$graph->AddY2($lineplot2);

(5) Set the title content and text style of the statistical chart and axis, and output the statistical chart

$graph->xaxis->title->Set(iconv('utf-8', 'GB2312//IGNORE', "月份"));//设置x轴的标题
$graph->yaxis->title->Set(iconv('utf-8', 'GB2312//IGNORE', "book A 销售金额（万元）"));//设置y轴的标题
$graph->y2axis->title->Set(iconv('utf-8', 'GB2312//IGNORE', "book B 销售金额（万元）"));//设置y轴的标题
$graph->y2axis->title->SetMargin(20);//设置右边的title到图的距离
$graph->title->SetFont(FF_SIMSUN, FS_BOLD);//设置字体
$graph->yaxis->title->SetFont(FF_SIMSUN, FS_BOLD);
$graph->y2axis->title->SetFont(FF_SIMSUN, FS_BOLD);
$graph->xaxis->title->SetFont(FF_SIMSUN, FS_BOLD);
$lineplot1->SetColor('red');//设置颜色
$lineplot2->SetColor('blue');
$lineplot1->SetLegend('book A');//绑定
$lineplot2->SetLegend('book B');
$graph->legend->SetLayout(LEGEND_HOR);
$graph->legend->Pos(0.4, 0.95, 'center', 'bottom');
//图例文字框的位置 0.4，0.95 是以右上角为基准的，0.4是距左右距离，0.95是上下距离。
$graph->Stroke();//输出

The running results are as follows:

The above is the entire content of this article, I hope it will be helpful to everyone's study.

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