feat: initial radar chart

[casesolved-co-uk]

Basic implementation of polar radar charts
Satisfies #151

Needs documentation, where do I put that?

fix: first rendering version without axis
feat: radial axis working but buggy, and tidy
feat: radar theta axis
fix: radar bugs and tidy
fix: missing state variable

Explanation About What Code Achieves:

• Radar chart / spider graph

Screenshots/GIFs:

Steps To Test:

let radar_data = {
	labels: [
		"Marketing & Communication",
		"Financial",
		"Technology",
		"Green Agenda",
		"Workforce Planning",
		"General Advice"
	],

	datasets: [
		{
			name: "Before",
			values: [4, 6, 8, 7, 3, 5]
		},
		{
			name: "After",
			values: [5, 7, 6, 3, 4, 6]
		}
	]
};

function render_radar() {
	new frappe.Chart("#chart-radar", {
		title: "Business Assessment",
		height: 400,
		colors: ["purple", "light-blue"],
		data: radar_data,
		type: 'radar',
		tooltipOptions: {
			formatTooltipX: (d) => (d + "").toUpperCase(),
			formatTooltipY: (d) => d + " pts"
		}
	});
}

TODOs:

• Animation
• Other methods