平移chart.js还会放大折线图 [英] pan on chart.js also zoom on line charts

问题描述

我想使用chartjs-plugin-zoom平移和缩放折线图。问题是，当我使用平移时，它还会放大图表，直到只剩下一个标签，而当图表模型为条形时则没有问题。我怎么解决这个问题？我想要平移只是平移而不缩放。
这是一个条形图，适用于条形图，但不适用于折线图：
https： //jsfiddle.net/pfd2on55/

I want to pan and zoom on a line chart with chartjs-plugin-zoom. The problem is that when I use pan it also zoom on chart till just one label remains, there is no problem when chart model is bar. how can I solve this problem? I want pan just to pan not zoom. this is a fiddle that works for bar chart but not works correctly for line chart: https://jsfiddle.net/pfd2on55/

var ctx = document.getElementById("canvas").getContext('2d');
var myChart = new Chart(ctx, {
type: 'line',
data: {
  labels: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sept'],
  datasets: [{
     label: '# of Votes',
     data: [12, 19, 3, 5, 2, 5, 9, 4, 11]
  }]
},
options: {
  pan: {
     enabled: true,
     mode: 'x',
  },
  zoom: {
     enabled: true,
     mode: 'x',
   }
   }
  });

推荐答案

我通过编辑文件Chart的panIndexScale函数解决了这个问题.Zoom.js。我更改了

var offsetAmt = Math.max（（scale.ticks.length-（（scale.options.gridLines.offsetGridLines）？0：1）），1）; 到

I solved this problem by editing function panIndexScale of file Chart.Zoom.js. I changed
var offsetAmt = Math.max((scale.ticks.length - ((scale.options.gridLines.offsetGridLines) ? 0 : 1)), 1); to

var offsetAmt = Math.max((scale.ticks.length - 0), 1); 

现在平移和缩放正常工作。

now pan and zoom work correctly.

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