javascript - 为什么 chart.js Canvas 不遵守容器元素的填充？

Question

我将 Chart.js 与简单的折线图一起使用，但 Chart.js 计算的宽度和高度属性似乎是基于忽略填充的父元素的总宽度和高度。

var options = {
    maintainAspectRatio: false,
    responsive: true
};

var data = {
    labels: ["", "", "", "", "", "", ""],
    datasets: [
        {
            label: "My First dataset",
            fillColor: "rgba(220,220,220,0.2)",
            strokeColor: "rgba(220,220,220,1)",
            pointColor: "rgba(220,220,220,1)",
            pointStrokeColor: "#fff",
            pointHighlightFill: "#fff",
            pointHighlightStroke: "rgba(220,220,220,1)",
            data: [65, 59, 80, 81, 56, 55, 40]
        },
        {
            label: "My Second dataset",
            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: [28, 48, 40, 19, 86, 27, 90]
        }
    ]
};

var ctx1 = document.getElementById("mychart1").getContext("2d");
var myNewChart = new Chart(ctx1).Line(data, options);

.container {
    padding: 15px 15px 15px 15px;
    width: 300px;
    height: 200px;
    border: 1px solid black;
}

.child {
    display: inline-block;
    border: 1px solid red;
    width:100%;
    height:100%;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/1.1.1/Chart.js"></script>


<div class='container'>
    <canvas id='mychart1' class='child'></canvas>
</div>
<br>
<div class='container'>
    <div class='child'>test</div>
</div>

JSFiddle

第二个容器和子容器显示了我期望的行为。这是 Chart.js 如何计算 Canvas 的宽度和高度的错误，还是我犯了样式错误？

Answer 1

我还需要一个响应式 Canvas 并遇到了这个问题。这是我的修复:

<div>
    <canvas id="chart"></canvas>
</div>

由于 Chart.js 将 Canvas 缩放到容器的宽度，忽略了填充，我只是将 Canvas 包裹在 div 中。 div 缩放到带有填充的容器，尊重填充，然后响应式 Chart.js canvas 缩放到 div。