1 files changed, 37 insertions, 0 deletions
diff --git a/arrows.js b/arrows.js
new file mode 100644
index 0000000..4584aea
--- /dev/null
+++ b/arrows.js
@@ -0,0 +1,37 @@
+
+arrows = [];
+
+const minSpeed = 3;
+const maxSpeed = 8;
+const delay = 3000;
+const lifetime = 20000;
+
+function make_arrow() {
+	const svg = document.getElementById("protoarrow").cloneNode();
+	svg.style.left = Math.random() * 100 + '%';
+	svg.style.display = 'block';
+	document.getElementById('arrows').append(svg);
+	const ob = {
+		y: -800, 
+		svg: svg, 
+		speed: Math.random() * (maxSpeed - minSpeed) + minSpeed
+	};
+	arrows.push(ob);
+	setTimeout(make_arrow, delay);
+	setTimeout(() => {
+		svg.remove();
+		arrows.remove(ob);
+	}, lifetime);
+}
+
+function update() {
+	for (const arrow of arrows) {
+		arrow.y += arrow.speed;
+		arrow.svg.style.bottom = arrow.y + 'px';
+	}
+	
+	window.requestAnimationFrame(update);
+}
+
+make_arrow();
+update();