jpgraph 根据每个条的值不同的颜色

Question

我是使用 jpgraph 的新手，我有一个条形图，我希望它根据每个条的值具有不同的颜色，

所以在百分比的情况下，当柱值为< 80时，我希望它是一个红柱，当它是>= 80 && <85时，我希望它是一个黄柱 strong> 当它是>= 85 时，一个绿条

我所能做的就是为图中的所有条形提供相似的颜色

这里是代码，如果你能帮我添加条件格式，请帮忙！

 $datay=array(90,82,70,30,100,85);

// Create the graph. These two calls are always required
$graph = new Graph(300,200,"auto");    
$graph->SetScale("textlin");

// Add a drop shadow
$graph->SetShadow();

// Adjust the margin a bit to make more room for titles
$graph->img->SetMargin(40,30,20,40);

// Create a bar pot
$bplot = new BarPlot($datay);

// Adjust fill color

$graph->Add($bplot);
$bplot->value->Show();

/* I tried to add if statement here but the pic won't render */
$bplot->SetFillColor('orange');

// Display the graph
$graph->Stroke();

Answer 1

您可以将每个条形的颜色放入一个数组中，并通过检查每个数据值来分配所需的颜色：

$datay=array(90,82,70,30,100,85);
$barcolors = array();

// Create the graph. These two calls are always required
$graph = new Graph(300,200,"auto");    
$graph->SetScale("textlin");

// Add a drop shadow
$graph->SetShadow();

// Adjust the margin a bit to make more room for titles
$graph->img->SetMargin(40,30,20,40);

// Create a bar pot
$bplot = new BarPlot($datay);

// Adjust fill color

$graph->Add($bplot);
$bplot->value->Show();

foreach ($datay as $datayvalue) {
    if ($datayvalue < '80') $barcolors[]='red';
    elseif ($datayvalue >= '80' && $datayvalue < '85') $barcolors[]='yellow';
    elseif ($datayvalue >= '85') $barcolors[]='green';
}

$bplot->SetFillColor($barcolors);

// Display the graph
$graph->Stroke();