因为在开发内部BI系统中需要画出统计图表，我选了Jpgraph 开源绘图工具实现需求。
之前实现过需求，没想到这次又花了很多时间回忆，各种搜索，真的是好记性不如烂笔头，
不会总结的人没有未来啊。
常用的三种图表样式：
// Create pie plot$p1 = new
PiePlot($data);$p1->SetCenter(0.5,0.55);$p1->SetSize(0.3);
// Enable and set policy for guide-lines. Make labels line up vertically$p1->SetGuideLines(true,false);$p1->SetGuideLinesAdjust(1.1);$p1->SetLegends($datatitle);
// Setup the labels$p1->SetLabelType(PIE_VALUE_PER);$p1->value->Show();$p1->value->SetFont(FF_ARIAL,FS_NORMAL,9);$p1->value->SetFormat(‘%2.1f%%‘); $graph->legend->SetLayout(LEGEND_VERT); $graph->Add($p1);$graph->Stroke(); 
// Set the basic parameters of the graph$graph = new
Graph($width,$height,‘auto‘);$graph->SetScale("textlin"); $top =
50;$bottom = 80;$left
= 80;$right = 25;$graph->Set90AndMargin($left,$right,$top,$bottom); $graph->xaxis->SetPos(‘min‘);
// Nice shadow$graph->SetShadow();
// Setup title$graph->title->Set($title);$graph->title->SetFont(FF_SIMSUN,FS_BOLD,10);
// Setup X-axis$graph->xaxis->SetTickLabels($datax);
//$graph->xaxis->SetFont(FF_SIMSUN,FS_BOLD,12);
// Some extra margin looks nicer$graph->xaxis->SetLabelMargin(5);
// Label align for X-axis$graph->xaxis->SetLabelAlign(‘right‘,‘center‘);
// Add some grace to y-axis so the bars doesn‘t go
// all the way to the end of the plot area$graph->yaxis->scale->SetGrace(20);
// Setup the Y-axis to be displayed in the bottom of the
// graph. We also finetune the exact layout of the title,
// ticks and labels to make them look nice.$graph->yaxis->SetPos(‘max‘);
// First make the labels look right$graph->yaxis->SetLabelAlign(‘center‘,‘top‘);$graph->yaxis->SetLabelFormat(‘%d‘);$graph->yaxis->SetLabelSide(SIDE_RIGHT);
// The fix the tick marks$graph->yaxis->SetTickSide(SIDE_LEFT);
// Finally setup the title$graph->yaxis->SetTitleSide(SIDE_RIGHT);$graph->yaxis->SetTitleMargin(35);
// Now create a bar pot$bplot = new
BarPlot($datay);$bplot->SetFillColor("orange");$bplot->SetShadow();
//You can change the width of the bars if you like
//$bplot->SetWidth(0.5);
// We want to display the value of each bar at the top$bplot->value->Show();$bplot->value->SetFont(FF_ARIAL,FS_BOLD,12);$bplot->value->SetAlign(‘left‘,‘center‘);$bplot->value->SetColor("black","darkred");$bplot->value->SetFormat(‘%.1f
mkr‘);
// Add the bar to the graph$graph->Add($bplot);$graph->Stroke();
以上为常用的图表及对应的后端实现：给自己记忆和需要人的便捷；
原文：http://www.cnblogs.com/logon/p/3530756.html