File: vendors/chart.js/src/elements/element.point.js

"use strict";

module.exports = function(Chart) {

	var helpers = Chart.helpers,
		globalOpts = Chart.defaults.global,
		defaultColor = globalOpts.defaultColor;

	globalOpts.elements.point = {
		radius: 3,
		pointStyle: 'circle',
		backgroundColor: defaultColor,
		borderWidth: 1,
		borderColor: defaultColor,
		// Hover
		hitRadius: 1,
		hoverRadius: 4,
		hoverBorderWidth: 1
	};

	Chart.elements.Point = Chart.Element.extend({
		inRange: function(mouseX, mouseY) {
			var vm = this._view;
			return vm ? ((Math.pow(mouseX - vm.x, 2) + Math.pow(mouseY - vm.y, 2)) < Math.pow(vm.hitRadius + vm.radius, 2)) : false;
		},
		inLabelRange: function(mouseX) {
			var vm = this._view;
			return vm ? (Math.pow(mouseX - vm.x, 2) < Math.pow(vm.radius + vm.hitRadius, 2)) : false;
		},
		tooltipPosition: function() {
			var vm = this._view;
			return {
				x: vm.x,
				y: vm.y,
				padding: vm.radius + vm.borderWidth
			};
		},
		draw: function() {
			var vm = this._view;
			var ctx = this._chart.ctx;
			var pointStyle = vm.pointStyle;
			var radius = vm.radius;
			var x = vm.x;
			var y = vm.y;
			var type, edgeLength, xOffset, yOffset, height, size;

			if (vm.skip) {
				return;
			}

			if (typeof pointStyle === 'object') {
				type = pointStyle.toString();
				if (type === '[object HTMLImageElement]' || type === '[object HTMLCanvasElement]') {
					ctx.drawImage(pointStyle, x - pointStyle.width / 2, y - pointStyle.height / 2);
					return;
				}
			}

			if (isNaN(radius) || radius <= 0) {
				return;
			}

			ctx.strokeStyle = vm.borderColor || defaultColor;
			ctx.lineWidth = helpers.getValueOrDefault(vm.borderWidth, globalOpts.elements.point.borderWidth);
			ctx.fillStyle = vm.backgroundColor || defaultColor;

			switch (pointStyle) {
			// Default includes circle
			default:
				ctx.beginPath();
				ctx.arc(x, y, radius, 0, Math.PI * 2);
				ctx.closePath();
				ctx.fill();
				break;
			case 'triangle':
				ctx.beginPath();
				edgeLength = 3 * radius / Math.sqrt(3);
				height = edgeLength * Math.sqrt(3) / 2;
				ctx.moveTo(x - edgeLength / 2, y + height / 3);
				ctx.lineTo(x + edgeLength / 2, y + height / 3);
				ctx.lineTo(x, y - 2 * height / 3);
				ctx.closePath();
				ctx.fill();
				break;
			case 'rect':
				size = 1 / Math.SQRT2 * radius;
				ctx.fillRect(x - size, y - size, 2 * size,  2 * size);
				ctx.strokeRect(x - size, y - size, 2 * size, 2 * size);
				break;
			case 'rectRot':
				ctx.translate(x, y);
				ctx.rotate(Math.PI / 4);
				size = 1 / Math.SQRT2 * radius;
				ctx.fillRect(-size, -size, 2 * size, 2 * size);
				ctx.strokeRect(-size, -size, 2 * size, 2 * size);
				ctx.setTransform(1, 0, 0, 1, 0, 0);
				break;
			case 'cross':
				ctx.beginPath();
				ctx.moveTo(x, y + radius);
				ctx.lineTo(x, y - radius);
				ctx.moveTo(x - radius, y);
				ctx.lineTo(x + radius, y);
				ctx.closePath();
				break;
			case 'crossRot':
				ctx.beginPath();
				xOffset = Math.cos(Math.PI / 4) * radius;
				yOffset = Math.sin(Math.PI / 4) * radius;
				ctx.moveTo(x - xOffset, y - yOffset);
				ctx.lineTo(x + xOffset, y + yOffset);
				ctx.moveTo(x - xOffset, y + yOffset);
				ctx.lineTo(x + xOffset, y - yOffset);
				ctx.closePath();
				break;
			case 'star':
				ctx.beginPath();
				ctx.moveTo(x, y + radius);
				ctx.lineTo(x, y - radius);
				ctx.moveTo(x - radius, y);
				ctx.lineTo(x + radius, y);
				xOffset = Math.cos(Math.PI / 4) * radius;
				yOffset = Math.sin(Math.PI / 4) * radius;
				ctx.moveTo(x - xOffset, y - yOffset);
				ctx.lineTo(x + xOffset, y + yOffset);
				ctx.moveTo(x - xOffset, y + yOffset);
				ctx.lineTo(x + xOffset, y - yOffset);
				ctx.closePath();
				break;
			case 'line':
				ctx.beginPath();
				ctx.moveTo(x - radius, y);
				ctx.lineTo(x + radius, y);
				ctx.closePath();
				break;
			case 'dash':
				ctx.beginPath();
				ctx.moveTo(x, y);
				ctx.lineTo(x + radius, y);
				ctx.closePath();
				break;
			}

			ctx.stroke();
		}
	});
};