Chart.js line chart is cut off at the top?

Question

For some reasone all graphs are cut off at the highest value. How can i fix this? I can\'t use a fixed y-axis

Answer 1

I had my data values stored in array. So I set my max and min values like this:

var _array = [1,3,2];
var suggestedMin = Math.max.apply(Math,_array); // 3
var suggestedMax = Math.min.apply(Math,_array); // 1

And than you can set

    options: {
        scales: {
            yAxes: [{
                ticks: {
                    beginAtZero: false,
                    suggestedMin: suggestedMin - 1,
                    suggestedMax: suggestedMax + 1,
                }
            }]
        }

    }

And it works, thank you.

Answer 2

I ran into this Chart.js bug, too.

A very recent fix is shown here. You'd have to manually edit your Chart.js file src/controllers/controller.line.js (For Angular 2, this file path will be located inside directory node_modules/chart.js/.)

Or just wait for the next Chart.js release which will most likely contain the fix.

An alternative workaround is described in comment 1 of this bug ticket: https://github.com/chartjs/Chart.js/issues/4202

Answer 3

Edit/Update: As mentioned in the comments, the 5px value can more accurately be just half of whatever your line width value is, I belive default is 2px so in that case you would just want padding: { top: 1 }

There a layout.padding attribute you can set either in options or global. I had this same problem and set

options: {
  layout: {
    padding: {
      top: 5
    }
  },
  ...
}

worked fine for me to not cut off the line http://www.chartjs.org/docs/#chart-configuration-layout-configuration

Answer 4

This issue has been fixed in the Chart.js library. Just update it and you'll be fine.

Answer 5

I used hardcode, just wide draw area at top and bottom. This code based on original Chart.canvasHelpers.clipArea.

const WIDE_CLIP = {top: 2, bottom: 4};

Chart.canvasHelpers.clipArea = function(ctx, clipArea) {
    ctx.save();
    ctx.beginPath();
    ctx.rect(
      clipArea.left,
      clipArea.top - WIDE_CLIP.top,
      clipArea.right - clipArea.left,
      clipArea.bottom - clipArea.top + WIDE_CLIP.bottom
    );
    ctx.clip();
};

Answer 6

The options.layout.padding.top solution didn't work for me (just added padding AFTER the line cut), so I extracted the high/low values from my data and used the suggestedMin and suggestedMax config params like this:

var suggestedMin = {MIN};
var suggestedMax = {MAX};

options: {
    scales: {
        yAxes: [{
            ticks: {
                suggestedMin: suggestedMin - 1,
                suggestedMax: suggestedMax + 1,
            }
        }]
    }
}