Actually adding snow

Snow.pde

@@ -0,0 +1,53 @@
+class Snow extends Effect{
+	// how fast the flakes should fall
+	float fallSpeed = .02;
+
+	//Array of points for the flakes
+	PVector[] flakes;
+
+	Snow(int _millis){
+		super(_millis);
+
+		//initialize the array to hold the flakes
+		flakes = new PVector[rows*cols/8];
+		for(int i=0; i<flakes.length; i++){
+			// put each new flake in a new location
+			flakes[i] = new PVector(floor(random(cols)), random(-5,rows/2));
+		}
+	}
+
+	void update(){
+		// do any commands in the Effect class update function
+		imageBuffer.beginDraw();
+
+		super.update();
+
+		// fade out the previous image to transparent
+		imageBuffer.background(0,0);
+
+        // move the flakes down
+        updateFlakes();	
+
+		// draw flakes to image buffer
+		imageBuffer.fill(255);
+		imageBuffer.noStroke();
+
+		for(PVector f : flakes){
+			imageBuffer.rect(f.x, f.y, 1, 1);
+		}
+
+        imageBuffer.endDraw();
+	}
+
+	// makes the flakes move down
+	void updateFlakes(){
+		for(int i =0; i<flakes.length; i++){
+			// if it goes past the end start somewhere new
+			if(flakes[i].y + fallSpeed > rows || random(1)<.01){
+				flakes[i] = new PVector(floor(random(cols)), random(-5, rows));
+			} else {
+				flakes[i].y += fallSpeed + random(.1);	
+			}
+		}
+	}
+}