Chart.js中的宽度和高度

问题描述 投票:1回答:1

我正在使用Chart.js并发现它识别以下两个styles不同 - <canvas style="">运作良好,而<style>canvas{}扭曲图表。这是两个例子。

<!doctype html>
<html>

<canvas id=Figure1 style="width:640px;height:480px"></canvas>

<script src=https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.3/Chart.min.js></script>
<script>
new Chart(document.getElementById("Figure1"),{type:"scatter",data:{datasets:[{data:[{x:1,y:1},{x:2,y:2},{x:3,y:3}]}]},options:{responsive:false}});
</script>
</html>

此代码不会扭曲图像,因此我想使用下面的代码全局应用设置。

<!doctype html>
<html>

<style>canvas{width:640px;height:480px}</style>

<canvas id=Figure1></canvas>
<script src=https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.3/Chart.min.js></script>
<script>
new Chart(document.getElementById("Figure1"),{type:"scatter",data:{datasets:[{data:[{x:1,y:1},{x:2,y:2},{x:3,y:3}]}]},options:{responsive:false}});
</script>
</html>

我刚刚在这段代码中重新定位了width:640px;height:480px,但它却奇怪地延伸了图像。我必须始终使用<canvas style="">来调整Chart.js图像的大小吗?

javascript css chart.js
1个回答
1
投票

指定画布的高度和宽度有很多种方法。但是你试过的两种方法有什么区别?好吧,完整的解释可以在这里找到Canvas is stretched when using CSS but normal with "width" / "height" properties

P.S你可以通过响应:使真实并将你的画布放在div中来使图表响应。这样,画布将始终采用其容器的尺寸。

let line_chart = document.getElementById("line-chart");

    new Chart(line_chart, {
    type: 'scatter',
    data: {
      datasets: [{ 
            label: 'Sample Data',
            data: [{ x: 1, y: 1 }, { x: 2, y: 2 }, { x: 3, y: 3 }] }],
      },
    options: {
      responsive:true,
    }
  });
/* If you change the wrapper's height and width, the chart will follow the wrapper's dimensions */
.wrapper{
  height: 200px;
  width: 300px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.3/Chart.bundle.js"></script>

<div class="wrapper">
  <canvas id="line-chart"></canvas>
</div>
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