Chart.js-添加渐变而不是纯色-实现解决方案 [英] Chart.js - add gradient instead of solid color - implementing solution
问题描述
我正在使用Chart.js,一切正常,但是我想用渐变色替换当前的颜色背景(fillColor: rgba(250,174,50,0.5))。
我有替换梯度的解决方案,但是我对这方面的JS知识不太了解,因此实在太难了。我想对了解JS的人来说很容易。
I am using Chart.js and everything is ok, but I want to replace current color background (fillColor : "rgba(250,174,50,0.5)") with a gradient. I have solution for replacing gradient but it's too dificult for me to implement this with my poor JS knowledge. I guess pretty easy for someone who know JS.
所以我的Chart.js代码:
<script>
var data = {
labels : ["02:00","04:00","06:00","08:00","10:00","12:00","14:00","16:00","18:00","20:00","22:00","00:00"],
datasets: [
{
fillColor : "rgba(250,174,50,0.5)",
strokeColor : "#ff6c23",
pointColor : "#fff",
pointStrokeColor : "#ff6c23",
pointHighlightFill: "#fff",
pointHighlightStroke: "#ff6c23",
data : [25.0,32.4,22.2,39.4,34.2,22.0,23.2,24.1,20.0,18.4,19.1,17.4]
}
]
};
var options = {
responsive: true,
datasetStrokeWidth : 3,
pointDotStrokeWidth : 4,
tooltipFillColor: "rgba(0,0,0,0.8)",
tooltipFontStyle: "bold",
tooltipTemplate: "<%if (label){%><%=label + ' hod' %>: <%}%><%= value + '°C' %>",
scaleLabel : "<%= Number(value).toFixed(0).replace('.', ',') + '°C'%>"
};
var ctx = document.getElementById("temp-chart").getContext("2d");
var myLineChart = new Chart(ctx).Line(data, options);
</script>
和这是渐变解决方案。有人可以尝试实现此渐变背景,而不是我当前的纯色背景吗?谢谢您的帮助。
And here is solution with gradient. Can someone try implement this gradient background instead of my current solid background? Thanks for help.
我尝试实现它,但是随后其他功能不起作用(例如scaleLabels等)。
I tryed implement it, but then other functions don't work (like scaleLabels etc.).
推荐答案
您提供的链接非常清晰,您必须在数据集中的 fillColor
字段中放置一个linearGradient对象,而不是纯色。您可以进行复杂的渐变,但这是一个简单的渐变的代码(更改相同橙色的不透明度):
The link you provided was pretty clear, you have to put in the field fillColor
in datasets a linearGradient object instead of a plain color. You can do complex gradients, but here is the code of a simple one (changing the opacity of the same orange) :
var gradient = ctx.createLinearGradient(0, 0, 0, 400);
gradient.addColorStop(0, 'rgba(250,174,50,1)');
gradient.addColorStop(1, 'rgba(250,174,50,0)');
以及完整的数据集:
datasets: [
{
fillColor : gradient, // Put the gradient here as a fill color
strokeColor : "#ff6c23",
pointColor : "#fff",
pointStrokeColor : "#ff6c23",
pointHighlightFill: "#fff",
pointHighlightStroke: "#ff6c23",
data : [25.0,32.4,22.2,39.4,34.2,22.0,23.2,24.1,20.0,18.4,19.1,17.4]
}
]
在此 JSFiddle
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