jpgraph 根据其值为每个条形图不同的颜色

Question

我是 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，当条值是 < 80 时，我希望它是 红色条 ，当它是 >= 80 && <85 时bw 一个 黄色条 当它是 >= 85 一个 绿色条

我所能做的就是为图中的所有条形图赋予相似的颜色

这是代码，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在一个数组中，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();

jpgraph 根据其值为每个条形图不同的颜色

jpgraph different color for each bar based on its value

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jpgraph