jpGraph中的透明背景

Question

我想通過透明背景實現線條圖，但到目前爲止，我只能將背景設置爲特定的顏色。既然是PNG，那麼應該是。

$linePlot = new LinePlot($plotData); 
$linePlot->SetFillColor('#61a9f3@.6'); 

$graph = new Graph(300, 100); 
$graph->SetScale('intint'); 

$graph->SetAlphaBlending(); 
$graph->SetMarginColor('black:1'); 
$graph->SetFrame(true,'black', 0); 

$graph->Add($linePlot); 
$graph->Stroke(); 

結果

不是透明的，但黑色

Answer 1

$graph->SetTheme($theme_class); 
$graph->img->SetAntiAliasing(false); 
$graph->title->Set('Filled Y-grid'); 
$graph->SetMarginColor('White:0.6'); 
$graph->SetFrame(true,'White:0.6',1); // The '1' here seems to be irrelevant 
            // I've tried much larger numbers with no 
            // change. This is supposed to be frame 
            // width (in pixels). 
$graph->SetBox(false); 

參考：change margin color for a jpgraph

Answer 2

透明PNG圖像：$ graph-> img-> SetTransparent（「white」）;很棒！