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Viewing file:     element.arc.js (2.54 KB)      -rw-r--r--

'use strict';

var defaults = require('../core/core.defaults');
var Element = require('../core/core.element');
var helpers = require('../helpers/index');

defaults._set('global', {
	elements: {
		arc: {
			backgroundColor: defaults.global.defaultColor,
			borderColor: '#fff',
			borderWidth: 2
		}
	}
});

module.exports = Element.extend({
	inLabelRange: function(mouseX) {
		var vm = this._view;

		if (vm) {
			return (Math.pow(mouseX - vm.x, 2) < Math.pow(vm.radius + vm.hoverRadius, 2));
		}
		return false;
	},

	inRange: function(chartX, chartY) {
		var vm = this._view;

		if (vm) {
			var pointRelativePosition = helpers.getAngleFromPoint(vm, {x: chartX, y: chartY});
			var	angle = pointRelativePosition.angle;
			var distance = pointRelativePosition.distance;

			// Sanitise angle range
			var startAngle = vm.startAngle;
			var endAngle = vm.endAngle;
			while (endAngle < startAngle) {
				endAngle += 2.0 * Math.PI;
			}
			while (angle > endAngle) {
				angle -= 2.0 * Math.PI;
			}
			while (angle < startAngle) {
				angle += 2.0 * Math.PI;
			}

			// Check if within the range of the open/close angle
			var betweenAngles = (angle >= startAngle && angle <= endAngle);
			var withinRadius = (distance >= vm.innerRadius && distance <= vm.outerRadius);

			return (betweenAngles && withinRadius);
		}
		return false;
	},

	getCenterPoint: function() {
		var vm = this._view;
		var halfAngle = (vm.startAngle + vm.endAngle) / 2;
		var halfRadius = (vm.innerRadius + vm.outerRadius) / 2;
		return {
			x: vm.x + Math.cos(halfAngle) * halfRadius,
			y: vm.y + Math.sin(halfAngle) * halfRadius
		};
	},

	getArea: function() {
		var vm = this._view;
		return Math.PI * ((vm.endAngle - vm.startAngle) / (2 * Math.PI)) * (Math.pow(vm.outerRadius, 2) - Math.pow(vm.innerRadius, 2));
	},

	tooltipPosition: function() {
		var vm = this._view;
		var centreAngle = vm.startAngle + ((vm.endAngle - vm.startAngle) / 2);
		var rangeFromCentre = (vm.outerRadius - vm.innerRadius) / 2 + vm.innerRadius;

		return {
			x: vm.x + (Math.cos(centreAngle) * rangeFromCentre),
			y: vm.y + (Math.sin(centreAngle) * rangeFromCentre)
		};
	},

	draw: function() {
		var ctx = this._chart.ctx;
		var vm = this._view;
		var sA = vm.startAngle;
		var eA = vm.endAngle;

		ctx.beginPath();

		ctx.arc(vm.x, vm.y, vm.outerRadius, sA, eA);
		ctx.arc(vm.x, vm.y, vm.innerRadius, eA, sA, true);

		ctx.closePath();
		ctx.strokeStyle = vm.borderColor;
		ctx.lineWidth = vm.borderWidth;

		ctx.fillStyle = vm.backgroundColor;

		ctx.fill();
		ctx.lineJoin = 'bevel';

		if (vm.borderWidth) {
			ctx.stroke();
		}
	}
});