[JpGraph]⑤--绘制XYY坐标图

 -21, 1 => -3, 2 => 12, 3 => 19, 4 => 23, 5 => 29, 6 => 30, 7 => 22, 8 => 26, 9 => 18, 10 => 5, 11 => -10);//第一条数据
$data2y = array(0 => 3, 1 => 12, 2 => 18, 3 => 30, 4 => 28, 5 => 33, 6 => 43, 7 => 39, 8 => 36, 9 => 29, 10 => 15, 11 => 10);//第二条数据
//得到Graph对象
$graph = new Graph(400, 400);
//设置X和Y轴样式及Y轴的最大值最小值
$graph->SetScale("textint", -30, 50);
//设置右侧Y轴样式及其最大值最小值
$graph->SetY2Scale("int", -30, 50);
//设置图像样式，加入阴影
$graph->SetShadow();
//设置图像边界范围
$graph->img->setMargin(40, 30, 50, 70);
//设置标题
$graph->title->Set("this is a test X-Y-Y");
//得到曲线实例
$linePlot = new LinePlot($data);
//得到第二条曲线
$linePlot2y = new LinePlot($data2y);
//将曲线加入到图像中
$graph->Add($linePlot);
$graph->Add($linePlot2y);
//设置三个坐标轴名称
$graph->xaxis->title->Set("Month");
$graph->yaxis->title->Set("beijing");
$graph->y2axis->title->Set("ShangHai");
//设置两条曲线的颜色
$linePlot->SetColor("red");
$linePlot2y->SetColor("black");
//设置两条曲线的图例
$linePlot->SetLegend("Beijing");
$linePlot2y->SetLegend("Shanghai");
//设置图例样式
$graph->legend->setlayout(LEGEND_HOR);
$graph->legend->Pos(0.45, 0.9, "center", "bottom");
//将图像输出到浏览器
$graph->Stroke();

Paste_Image.png