Create a Flash game like Snowflakes – AS3 version
As announced in Create a Flash game like Snowflakes, here it is the AS3 version.
I used the same comments to help you understanding the conversion.
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import flash.display.Sprite;
import flash.ui.Mouse;
import flash.events.*;
public class snowflakesas3 extends Sprite {
// max stars on stage
var max_stars = 20;
// current stars on stage
var stars_on_stage = 0;
// gravity
var gravity = 0.1;
// this is the influence distance
// using influence and real_influence I perform the square root only once
// when the distance from the mouse and the star is less than real_influence
// then the star is affected by the mouse
var influence = 625;
var real_influence = Math.sqrt(influence);
// friction
var friction = 0.9;
// divider, to make stars move slowly
var divider = 50;
// mouse speed
var mouse_speed = 0;
var playersprite:pointer = new pointer();
public function snowflakesas3() {
// mouse cursor replacement
Mouse.hide();
playersprite.addEventListener(Event.ENTER_FRAME,playersprite_enterframe);
addChild(playersprite);
addEventListener(Event.ENTER_FRAME,main_enterframe);
}
// function to be executed by the mouse pointer
public function playersprite_enterframe(event:Event) {
// calculating the distance from the last point the mouse was spotted
// and the current mouse position
var dist_x = playersprite.x-mouseX;
var dist_y = playersprite.y-mouseY;
mouse_speed = Math.sqrt(dist_x*dist_x+dist_y*dist_y);
// minimum speed = minimum force applied
if (mouse_speed<0.2) {
mouse_speed = 0.2;
}// updating pointer position
playersprite.x = mouseX;
playersprite.y = mouseY;
}
// main function
public function main_enterframe(event:Event) {
// should I add a star?
if (stars_on_stage<max_stars) {
//adding a star
stars_on_stage++;
var starsprite: star = new star();
starsprite.xspeed = 0;
starsprite.yspeed = 0;
starsprite.x = Math.random()*450+25;
starsprite.y = Math.random()*50-100;
starsprite.addEventListener(Event.ENTER_FRAME,starsprite_enterframe);
addChild(starsprite);
}
}
// function the star will execute at every frame
public function starsprite_enterframe(event:Event) {
var current_star:star = (event.currentTarget as star);
// gravity
current_star.yspeed += gravity;
// calculating the distance from the star and the mouse
// without square roots
var dist_x = current_star.x-mouseX;
var dist_y = current_star.y-mouseY;
var distance = dist_x*dist_x+dist_y*dist_y;
// if we are in the radius of influence...
if (distance<influence) {
// ...apply a force to the star
// force is determined by mouse distance and speed
var xforce = mouse_speed*dist_x/divider;
var yforce = mouse_speed*dist_y/divider;
current_star.xspeed += xforce;
current_star.yspeed += yforce;
}
// adding friction
current_star.xspeed *= friction;
current_star.yspeed *= friction;
// updating position
current_star.y += current_star.yspeed;
current_star.x += current_star.xspeed;
// make the star rotate
current_star.rotation += (current_star.xspeed+current_star.yspeed);
// if the star reaches the bottom of the stage, remove it
if (current_star.y>300) {
stars_on_stage--;
current_star.removeEventListener(Event.ENTER_FRAME,starsprite_enterframe);
removeChild(current_star);
}
}
}
} |
There is no better way in learning a new language than porting your old projects into the new language.
I’ll write a post about it… meanwhile download the source code.
They can be easily customized to meet the unique requirements of your project.















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