3👍
As far as i saw in similar problems the solution should be to extend the Chart.types.Bar.extend
https://jsfiddle.net/hyacinthe/t8khnL4q/
Chart.types.Bar.extend({
name: "BarAlt",
initialize: function (data) {
Chart.types.Bar.prototype.initialize.apply(this, arguments);
if (this.options.curvature !== undefined && this.options.curvature <= 1) {
var rectangleDraw = this.datasets[0].bars[0].draw;
var self = this;
var radius = this.datasets[0].bars[0].width * this.options.curvature * 0.2;
// override the rectangle draw with ours
this.datasets.forEach(function (dataset) {
dataset.bars.forEach(function (bar) {
bar.draw = function () {
// draw the original bar a little down (so that our curve brings it to its original position)
var y = bar.y;
// the min is required so animation does not start from below the axes
bar.y = Math.min(bar.y + radius, self.scale.endPoint - 1);
// adjust the bar radius depending on how much of a curve we can draw
var barRadius = (bar.y - y);
rectangleDraw.apply(bar, arguments);
// draw a rounded rectangle on top
Chart.helpers.drawRoundedRectangle(self.chart.ctx, bar.x - bar.width / 2, bar.y - barRadius + 1, bar.width, bar.height, barRadius);
ctx.fill();
// restore the y value
bar.y = y;
}
})
})
}
}
});
The credit of this answer goes to @potatopeelings.
Source:stackexchange.com