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Editing: chartjs-extensions.js

/*
* Chart.JS Extension
* @version: 1.0.0 (Mon, 25 Nov 2019)
* @requires: Chart.js
* @author: HtmlStream
* @event-namespace: Chart.JS Extension
* @license: Htmlstream Libraries (https://htmlstream.com/)
* Copyright 2019 Htmlstream
*/

function detectRadius(r, h, w, i) {
	if (typeof r === 'object') {
		if (r[i] > h / 2) {
			r[i] = h / 2;
		}
		
		if (r[i] > w / 2) {
			r[i] = w / 2;
		}
		
		return r[i];
	} else {
		if (r > h / 2) {
			r = h / 2;
		}
		
		if (r > w / 2) {
			r = w / 2;
		}
		
		return r;
	}
}

window.Chart.elements.Rectangle.prototype.draw = function () {
	var ctx = this._chart.ctx,
		vm = this._view,
		left,
		right,
		top,
		bottom,
		signX,
		signY,
		borderSkipped,
		borderWidth,
		defaults = {
			options: {
				cornerRadius: 0
			}
		},
		dataSettings = $(this._chart.canvas).attr('data-hs-chartjs-options') ? JSON.parse($(this._chart.canvas).attr('data-hs-chartjs-options')) : {},
		settings = $.extend(true, dataSettings.type, defaults, dataSettings);
	
	borderWidth = vm.borderWidth;
	
	if (!vm.horizontal) {
		// bar
		left = vm.x - vm.width / 2;
		right = vm.x + vm.width / 2;
		top = vm.y;
		bottom = vm.base;
		signX = 1;
		signY = bottom > top ? 1 : -1;
		borderSkipped = vm.borderSkipped || 'bottom';
	} else {
		// horizontal bar
		left = vm.base;
		right = vm.x;
		top = vm.y - vm.height / 2;
		bottom = vm.y + vm.height / 2;
		signX = right > left ? 1 : -1;
		signY = 1;
		borderSkipped = vm.borderSkipped || 'left';
	}
	
	// Canvas doesn't allow us to stroke inside the width so we can
	// adjust the sizes to fit if we're setting a stroke on the line
	if (borderWidth) {
		// borderWidth shold be less than bar width and bar height.
		var barSize = Math.min(Math.abs(left - right), Math.abs(top - bottom));
		borderWidth = borderWidth > barSize ? barSize : borderWidth;
		var halfStroke = borderWidth / 2;
		// Adjust borderWidth when bar top position is near vm.base(zero).
		var borderLeft = left + (borderSkipped !== 'left' ? halfStroke * signX : 0);
		var borderRight = right + (borderSkipped !== 'right' ? -halfStroke * signX : 0);
		var borderTop = top + (borderSkipped !== 'top' ? halfStroke * signY : 0);
		var borderBottom = bottom + (borderSkipped !== 'bottom' ? -halfStroke * signY : 0);
		// not become a vertical line?
		if (borderLeft !== borderRight) {
			top = borderTop;
			bottom = borderBottom;
		}
		// not become a horizontal line?
		if (borderTop !== borderBottom) {
			left = borderLeft;
			right = borderRight;
		}
	}
	
	ctx.beginPath();
	ctx.fillStyle = vm.backgroundColor;
	ctx.strokeStyle = vm.borderColor;
	ctx.lineWidth = borderWidth;
	
	// Corner points, from bottom-left to bottom-right clockwise
	// | 1 2 |
	// | 0 3 |
	var corners = [
		[left, bottom],
		[left, top],
		[right, top],
		[right, bottom]
	];
	
	// Find first (starting) corner with fallback to 'bottom'
	var borders = ['bottom', 'left', 'top', 'right'],
		startCorner = borders.indexOf(borderSkipped, 0);
	if (startCorner === -1) {
		startCorner = 0;
	}
	
	function cornerAt(index) {
		return corners[(startCorner + index) % 4];
	}
	
	// Draw rectangle from 'startCorner'
	var corner = cornerAt(0),
		radius,
		nextCornerId,
		nextCorner,
		width,
		height,
		x,
		y;
	ctx.moveTo(corner[0], corner[1]);
	
	for (var i = 1; i < 4; i++) {
		corner = cornerAt(i);
		nextCornerId = i + 1;
		
		if (nextCornerId === 4) {
			nextCornerId = 0;
		}
		
		nextCorner = cornerAt(nextCornerId);
		
		width = corners[2][0] - corners[1][0];
		height = corners[0][1] - corners[1][1];
		x = corners[1][0];
		y = corners[1][1];
		
		radius = settings.options.cornerRadius;
		
		// Fix radius being too large
		ctx.moveTo(x + detectRadius(radius, height, width, typeof radius === 'object' ? 0 : null), y);
		
		ctx.lineTo(x + width - detectRadius(radius, height, width, typeof radius === 'object' ? 0 : null), y);
		ctx.quadraticCurveTo(x + width, y, x + width, y + detectRadius(radius, height, width, typeof radius === 'object' ? 0 : null));
		
		ctx.lineTo(x + width, y + height - detectRadius(radius, height, width, typeof radius === 'object' ? 1 : null));
		ctx.quadraticCurveTo(x + width, y + height, x + width - detectRadius(radius, height, width, typeof radius === 'object' ? 1 : null), y + height);
		
		ctx.lineTo(x + detectRadius(radius, height, width, typeof radius === 'object' ? 2 : null), y + height);
		ctx.quadraticCurveTo(x, y + height, x, y + height - detectRadius(radius, height, width, typeof radius === 'object' ? 0 : null));
		
		ctx.lineTo(x, y + detectRadius(radius, height, width, typeof radius === 'object' ? 3 : null));
		ctx.quadraticCurveTo(x, y, x + detectRadius(radius, height, width, typeof radius === 'object' ? 3 : null), y);
	}
	
	ctx.fill();
	
	if (borderWidth) {
		ctx.stroke();
	}
};