AS3.0 realize the realistic fountain effect

The first step is to draw a drop of water, create a new movie clip element, with a radial fill to draw an ellipse, the left color is white, transparency 100%, right color mark slightly gray, transparency 50%. Set the ellipse in the property panel to be 2 pixels wide and 5 pixels high. Right-click the symbol in the library, open the Connection window, (CS4 open the Properties window), set a class name, I set the pall.
Next, go back to the main scene, open the Frame action panel, and we'll write the code.

Fountain is formed by a number of water droplets, how many? I've made 500:
var count:int = 500;
Gravity velocity vector:
var zl:number = 0.5;
Put these 500 drops in an array:
var Balls:array;
Balls = new Array ();
Use a For loop to place 500 drops of water in the array:
for (var i:int = 0; i < count; i++) {
var ball:pall = new Pall ();
Position the droplet to the nozzle of the droplet:
ball.x = 260;
BALL.Y = 200;
A velocity vector is also set in the x-axis direction so that the droplets are within a certain range of the x-axis and the velocity vector is stored in the custom attribute VX for each droplet:
ball["VX"]= math.random () * 2-1;
Here is the velocity vector in the y-axis direction, which is in the custom attribute VY:
ball["VY"] = Math.random () *-10-10;
Place the drops on the stage and into the array:
AddChild (ball);
Balls.push (ball);
Next listen for the Enter_frame event to achieve the fountain effect:
AddEventListener (Event.enter_frame, onenterframe);
Onenterframe function Content:
With a For loop the droplets in the array are combined with each speed vector:
for (var i:number = 0; i < balls.length; i++) {
var ball:pall = Pall (balls);
The first choice is to add a gravitational velocity vector to the jet velocity vector, so that each frame is added with a gravity, and the jet force does not change, so gravity will gradually exceed the jet force surface to drop the drops:
ball["VY"] + = ZL;
Add the x,y axis velocity vector to the water droplets:
ball.x +=ball["VX"];
Ball.y +=ball["VY"];
Next is to see if the water is beyond the stage, if the stage is exceeded, then reposition the water droplets to the nozzle, and set the speed vector to the initial state.
if (ball.x-ball.width/2> stage.stagewidth | |
ball.x + BALL.WIDTH/2 < 0 | |
BALL.Y-BALL.WIDTH/2 > Stage.stageheight | |
Ball.y + BALL.WIDTH/2 < 0) {
ball.x = 260;
BALL.Y = 200;
ball["VX"]= math.random () * 2-1;
ball["VY"] = Math.random () *-10-10;

Complete code:

var count:int = 500;
var zl:number = 0.5;
var Balls:array;
Balls = new Array ();
for (var i:int = 0; i < count; i++) {
var ball:pall = new Pall ();
ball.x = 260;
BALL.Y = 200;
ball["VX"]= math.random () * 2-1;
ball["VY"] = Math.random () *-10-10;
AddChild (ball);
Balls.push (ball);
}
AddEventListener (Event.enter_frame, onenterframe);
function Onenterframe (event:event): void {
for (var i:number = 0; i < balls.length; i++) {
var ball:pall = Pall (Balls[i]);
ball["VY"] + = ZL;
ball.x +=ball["VX"];
Ball.y +=ball["VY"];
if (ball.x-ball.width/2> stage.stagewidth | |
ball.x + BALL.WIDTH/2 < 0 | |
BALL.Y-BALL.WIDTH/2 > Stage.stageheight | |
Ball.y + BALL.WIDTH/2 < 0) {
ball.x = 260;
BALL.Y = 200;
ball["VX"]= math.random () * 2-1;
ball["VY"] = Math.random () *-10-10;
}
}
}

Look at the effect.