clean up UI code

1 files changed, 50 insertions, 0 deletions

diff --git a/src/ui/Links.js b/src/ui/Links.js
new file mode 100644
index 0000000..dfd981f
--- /dev/null
+++ b/src/ui/Links.js
@@ -0,0 +1,50 @@
+import { render, h, Fragment } from 'preact';
+import { useRef, useLayoutEffect } from 'preact/hooks';
+
+export const Links = ({ links, ...props }) => {
+	const canvas = useRef(null);
+
+	useLayoutEffect(() => {
+		const ctx = canvas.current.getContext('2d');
+		ctx.lineWidth = 4;
+		ctx.lineCap = 'round';
+		ctx.lineJoin = 'round';
+		ctx.strokeStyle = '#696969';
+		ctx.fillStyle = '#696969';
+		ctx.shadowBlur = 2;
+		ctx.shadowOffsetX = 2;
+		ctx.shadowOffsetY = 4;
+
+		ctx.clearRect(0, 0, canvas.current.width, canvas.current.height);
+
+		for (const points of links) {
+			ctx.shadowColor = 'rgba(0,0,0, 0.7)';
+			ctx.beginPath();
+			ctx.moveTo(...points[1]);
+			for (let i = 4; i < points.length; i += 3) {
+				const [ax, ay] = points[i - 2];
+				const [bx, by] = points[i - 1];
+				const [x, y] = points[i];
+				ctx.bezierCurveTo(ax, ay, bx, by, x, y);
+			}
+			ctx.stroke();
+
+			const [lx, ly] = points[points.length - 1];
+			const [tx, ty] = points[0];
+			const [dx, dy] = [tx - lx, ty - ly];
+			const [hx, hy] = [dy*0.7, dx*-0.7];
+
+			ctx.shadowColor = 'transparent';
+			ctx.beginPath();
+			ctx.moveTo(lx + dx*0.8, ly + dy*0.8);
+			ctx.lineTo(lx - dx*0.5 + hx, ly - dy*0.5 + hy);
+			ctx.lineTo(lx - dx*0.5 - hx, ly - dy*0.5 - hy);
+			ctx.fill();
+		}
+	});
+
+	return (
+		<canvas {...props} ref={canvas} />
+	);
+};
+