我试图保存使用chart . js图形库创建的图表的副本。当我使用。tobase64image()函数来显示或保存。png图像时,我得到一个空白图像。我试过在一个img标签中显示,并使用PHP保存图像。save64Img是我显示/保存图像的函数。有人有幸使用这个功能吗?
lineOptions = {
scaleShowGridLines : true,
scaleGridLineColor : "rgba(0,0,0,.05)",
scaleGridLineWidth : 1,
bezierCurve : false,
pointDot : true,
pointDotRadius : 4,
pointDotStrokeWidth : 1,
pointHitDetectionRadius : 20,
datasetStroke : true,
datasetStrokeWidth : 1,
datasetFill : true,
responsive: true,
scaleOverride : true,
scaleSteps : 5,
scaleStepWidth : 20,
scaleStartValue : 0
}
lineChart = {
labels : label,
datasets : [
{
label: "stat1",
fillColor : "rgba(128,0,0,0.2)",
strokeColor : "rgba(128,0,0,1)",
pointColor : "rgba(128,0,0,1)",
pointStrokeColor : "#fff",
pointHighlightFill : "#fff",
pointHighlightStroke : "rgba(128,0,0,1)",
data : stat1
},
{
label: "stat2",
fillColor : "rgba(151,187,205,0.2)",
strokeColor : "rgba(151,187,205,1)",
pointColor : "rgba(151,187,205,1)",
pointStrokeColor : "#fff",
pointHighlightFill : "#fff",
pointHighlightStroke : "rgba(151,187,205,1)",
data : stat2
}
]
};
var myChart = new Chart(ctx).Line(lineChart, lineOptions);
save64Img(myChart.toBase64Image());
----------
<?php
$data = base64_decode(preg_replace('#^data:image/'w+;base64,#i', '', $img));
file_put_contents('/tmp/image.png', $data);
?>
我知道自从你问这个问题以来已经有一段时间了,但是在Chart.js v2中,你必须在动画选项中使用onComplete
方法。
animation: {
duration: 1500,
onComplete: function (animation) {
this.toBase64Image();
}
您必须通过一个额外的回调调用save64Img(myChart.toBase64Image())
。您可以将此回调添加到选项
lineOptions = {
onAnimationComplete: function () {
save64Img(myChart.toBase64Image());
}
}