Add snow

public/js/christmas/snow.js

@@ -0,0 +1,112 @@
+/*!
+// Snow.js - v0.0.3
+// kurisubrooks.com
+//
+// Modified by floppydisk
+// - Changed snowflakes to "Heavy chevron snowflake" (U+2746)
+// - Made snowflakes randomly rotate slowly either right or left
+*/
+
+
+// Amount of Snowflakes
+var snowMax = 80;
+
+// Snowflake Colours
+var snowColor = [
+    "#cad3f5",
+    "#a5adcb",
+    "#5b6078"
+];
+
+// Snow Entity
+var snowEntity = "&#10054" //"•";
+
+// Falling Velocity
+var snowSpeed = 0.5;
+
+// Minimum Flake Size
+var snowMinSize = 8;
+
+// Maximum Flake Size
+var snowMaxSize = 24;
+
+// Refresh Rate (in milliseconds)
+var snowRefresh = 50;
+
+// Additional Styles
+var snowStyles = "cursor: default; -webkit-user-select: none; -moz-user-select: none; -ms-user-select: none; -o-user-select: none; user-select: none;";
+
+/*
+// End of Configuration
+// ----------------------------------------
+// Do not modify the code below this line
+*/
+
+var snow = [],
+	pos = [],
+	coords = [],
+	lefr = [],
+	marginBottom,
+	marginRight;
+
+function randomise(range) {
+	rand = Math.floor(range * Math.random());
+	return rand;
+}
+
+function initSnow() {
+	var snowSize = snowMaxSize - snowMinSize;
+	marginBottom = window.screen.height - 5;
+	marginRight = document.body.clientWidth - 15;
+
+	for (i = 0; i <= snowMax; i++) {
+		coords[i] = 0;
+		lefr[i] = Math.random() * 15;
+		pos[i] = 0.03 + Math.random() / 10;
+		snow[i] = document.getElementById("flake" + i);
+		snow[i].style.fontFamily = "inherit";
+		snow[i].size = randomise(snowSize) + snowMinSize;
+		snow[i].style.fontSize = snow[i].size + "px";
+		snow[i].style.color = snowColor[randomise(snowColor.length)];
+		snow[i].style.zIndex = 1000;
+		snow[i].sink = snowSpeed * snow[i].size / 5;
+		snow[i].posX = randomise(marginRight - snow[i].size);
+		snow[i].posY = randomise(2 * marginBottom - marginBottom - 2 * snow[i].size);
+		snow[i].style.left = snow[i].posX + "px";
+		snow[i].style.top = snow[i].posY + "px";
+        snow[i].rotation = Math.random() * 360; // add a random initial rotation
+        snow[i].direction = Math.random() > 0.5 ? 1 : -1; // add a random direction
+    }
+
+	moveSnow();
+}
+
+function resize() {
+	marginBottom = window.screen.height - 5;
+	marginRight = document.body.clientWidth - 15;
+}
+
+function moveSnow() {
+	for (i = 0; i <= snowMax; i++) {
+		coords[i] += pos[i];
+		snow[i].posY += snow[i].sink;
+		snow[i].style.left = snow[i].posX + lefr[i] * Math.sin(coords[i]) + "px";
+		snow[i].style.top = snow[i].posY + "px";
+
+		if (snow[i].posY >= marginBottom - 2 * snow[i].size || parseInt(snow[i].style.left) > (marginRight - 3 * lefr[i])) {
+			snow[i].posX = randomise(marginRight - snow[i].size);
+			snow[i].posY = 0;
+		}
+        snow[i].rotation += snow[i].sink * snow[i].direction; // increment rotation based on direction
+        snow[i].style.transform = "rotate(" + snow[i].rotation + "deg)"; // rotate the snowflake
+    }
+
+	setTimeout("moveSnow()", snowRefresh);
+}
+
+for (i = 0; i <= snowMax; i++) {
+	document.write("<span id='flake" + i + "' style='" + snowStyles + "position:absolute;top:-" + snowMaxSize + "'>" + snowEntity + "</span>");
+}
+
+window.addEventListener('resize', resize);
+window.addEventListener('load', initSnow);