Be my fan on FacebookNew tile based platform engine – AS3 version
First, I would like to say the engine is not finished as I have a lot of tile types to add.
This is the AS3 version of part 6.
I am fixing some glitches and preparing another post about the theory of platform games
This is the code
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import flash.display.Sprite;
import flash.ui.Mouse;
import flash.events.Event;
import flash.events.KeyboardEvent;
public class newplat06_as3 extends Sprite {
var over = "";
var bonus_speed = 0;
var press_left = false;
var press_right = false;
var press_up = false;
var press_down = false;
var press_space = false;
var x_pos = 0;
var y_pos = 0;
var tile_size = 20;
var ground_acceleration = 1;
var ground_friction = 0.8;
var air_acceleration = 0.5;
var air_friction = 0.7;
var ice_acceleration = 0.15;
var ice_friction = 0.95;
var treadmill_speed = 2;
var max_speed = 3;
var xspeed = 0;
var yspeed = 0;
var falling = false;
var gravity = 0.5;
var jump_speed = 6;
var climbing = false;
var climb_speed = 0.8;
var level = new Array();
var player = new Array(5,1);
var h:hero = new hero();
public function newplat06_as3() {
level[0] = [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1];
level[1] = [1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1];
level[2] = [1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 1, 0, 0, 0, 0, 1];
level[3] = [1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 1];
level[4] = [1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 1];
level[5] = [1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 1];
level[6] = [1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 1, 0, 0, 0, 0, 0, 1];
level[7] = [1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 1];
level[8] = [1, 1, 1, 1, 0, 0, 0, 0, 0, 5, 5, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 1];
level[9] = [1, 1, 1, 1, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 4, 4, 4, 4, 1, 1];
create_level(level);
addEventListener(Event.ENTER_FRAME,on_enter_frame);
stage.addEventListener(KeyboardEvent.KEY_DOWN, key_down);
stage.addEventListener(KeyboardEvent.KEY_UP, key_up);
}
public function key_down(event:KeyboardEvent) {
if (event.keyCode == 32) {
press_space = true;
}
if (event.keyCode == 37) {
press_left = true;
}
if (event.keyCode == 38) {
press_up = true;
}
if (event.keyCode == 39) {
press_right = true;
}
if (event.keyCode == 40) {
press_down = true;
}
}
public function key_up(event:KeyboardEvent) {
if (event.keyCode == 32) {
press_space = false;
}
if (event.keyCode == 37) {
press_left = false;
}
if (event.keyCode == 38) {
press_up = false;
}
if (event.keyCode == 39) {
press_right = false;
}
if (event.keyCode == 40) {
press_down = false;
}
}
public function create_level(l) {
var level_container:Sprite = new Sprite();
var level_height = l.length;
var level_width = l[0].length;
addChild(level_container);
for (j=0; j<level_height; j++) {
for (i=0; i<level_width; i++) {
if (l[j][i] != 0) {
var t:tile = new tile();
t.x = i*tile_size;
t.y = j*tile_size;
t.gotoAndStop(l[j][i]);
level_container.addChild(t);
}
}
}
x_pos = player[0]*tile_size+tile_size/2;
y_pos = player[1]*tile_size+tile_size/2+1;
h.x = x_pos;
h.y = y_pos;
level_container.addChild(h);
}
public function on_enter_frame(event:Event) {
ground_under_feet();
walking = false;
climbing = false;
if (press_left) {
xspeed-=speed;
walking = true;
}
if (press_right) {
xspeed += speed;
walking = true;
}
if (press_up) {
get_edges();
if (top_right == 6 || bottom_right == 6 || top_left == 6 || bottom_left == 6) {
jumping = false;
falling = false;
climbing = true;
climbdir = -1;
}
}
if (press_down) {
get_edges();
if (over == "ladder") {
jumping = false;
falling = false;
climbing = true;
climbdir = 1;
}
}
if (press_space) {
get_edges();
if (!falling && !jumping) {
jumping = true;
yspeed = -jump_speed;
}
}
if (!walking) {
xspeed *= friction;
if (Math.abs(xspeed)<0.5) {
xspeed = 0;
}
}
if (xspeed>max_speed) {
xspeed = max_speed;
}
if (xspeed<max_speed*-1) {
xspeed = max_speed*-1;
}
if (falling || jumping) {
yspeed += gravity;
}
if (climbing) {
yspeed = climb_speed*climbdir;
}
if (!falling && !jumping && !climbing) {
yspeed = 0;
}
xspeed += bonus_speed;
check_collisions();
h.x = x_pos;
h.y = y_pos;
xspeed -= bonus_speed;
}
public function ground_under_feet() {
bonus_speed = 0;
var left_foot_x = Math.floor((x_pos-6)/tile_size);
var right_foot_x = Math.floor((x_pos+5)/tile_size);
var foot_y = Math.floor((y_pos+9)/tile_size);
var left_foot = level[foot_y][left_foot_x];
var right_foot = level[foot_y][right_foot_x];
if (left_foot != 0) {
current_tile = left_foot;
} else {
current_tile = right_foot;
}
switch (current_tile) {
case 0 :
speed = air_acceleration;
friction = air_friction;
falling = true;
break;
case 1 :
over = "ground";
speed = ground_acceleration;
friction = ground_friction;
break;
case 2 :
over = "ice";
speed = ice_acceleration;
friction = ice_friction;
break;
case 3 :
over = "treadmill";
speed = ground_acceleration;
friction = ground_friction;
bonus_speed = -treadmill_speed;
break;
case 4 :
over = "treadmill";
speed = ground_acceleration;
friction = ground_friction;
bonus_speed = treadmill_speed;
break;
case 5 :
over = "cloud";
speed = ground_acceleration;
friction = ground_friction;
break;
case 6 :
over = "ladder";
speed = ground_acceleration;
friction = ground_friction;
break;
}
}
public function check_collisions() {
y_pos += yspeed;
get_edges();
// collision to the bottom
if (yspeed>0) {
if ((bottom_right != 0 && bottom_right != 6) || (bottom_left != 0 && bottom_left != 6)) {
if (bottom_right != 5 && bottom_left != 5) {
y_pos = bottom*tile_size-9;
yspeed = 0;
falling = false;
jumping = false;
} else {
if (prev_bottom<bottom) {
y_pos = bottom*tile_size-9;
yspeed = 0;
falling = false;
jumping = false;
}
}
}
}
// collision to the top
if (yspeed<0) {
if ((top_right != 0 && top_right != 5 && top_right != 6) || (top_left != 0 && top_left != 5 && top_left != 6)) {
y_pos = bottom*tile_size+1+8;
yspeed = 0;
falling = false;
jumping = false;
}
}
x_pos += xspeed;
get_edges();
// collision to the left
if (xspeed<0) {
if ((top_left != 0 && top_left != 5 && top_left != 6) || (bottom_left != 0 && bottom_left != 5 && bottom_left != 6)) {
x_pos = (left+1)*tile_size+6;
xspeed = 0;
}
}
// collision to the right
if (xspeed>0) {
if ((top_right != 0 && top_right != 5 && top_right != 6) || (bottom_right != 0 && bottom_right != 5 && bottom_right != 6)) {
x_pos = right*tile_size-6;
xspeed = 0;
}
}
prev_bottom = bottom;
}
function get_edges() {
// right edge
right = Math.floor((x_pos+5)/tile_size);
// left edge
left = Math.floor((x_pos-6)/tile_size);
// bottom edge
bottom = Math.floor((y_pos+8)/tile_size);
// top edge
top = Math.floor((y_pos-9)/tile_size);
// adjacent tiles
top_right = level[top][right];
top_left = level[top][left];
bottom_left = level[bottom][left];
bottom_right = level[bottom][right];
}
}
} |
The result is the same, so no need to publish it… just download the source code.
Rate this post: 
(8 votes, average: 3.75 out of 5)
(8 votes, average: 3.75 out of 5)
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9 Responses to “New tile based platform engine – AS3 version”
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Introduction to AS3 classes : Emanuele Feronato on
October 28th, 2008 11:16 am
[...] taken it from New tile based platform engine – AS3 version. PLAIN TEXT [...]
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haha, i did nearly the exact same thing last night and was going to send as comment but no need. nice work.
How is this supposed to work? While file do you compile?
make sure its not in a temp directory. extract elements to desktop or folder and run the as file. worked fine for me. you might want to explain the code/platform tile engines more than you did but it was well written. gl john
did you delete comment? there was question but seems it got deleted… i have a version of a engine ive been wokring on that allows the user to change the enviorment as they play. i can upload if u want
I never delete comments.
I am working on the same thing you are working on… for a game I am about to release.
If you want me to publish it, send it by email at info@emanueleferonato.com
You’re trying to manage too many separate tasks in a single class which is never a good idea. Try to break tasks into categories like map management, a player movement controller, and maybe a game drawing class.
Your enter frame function should look something like this:
playerController.update();
mapSystem.update();
collisionManager.check();
gfx.draw();
Thanks for the AS3 version! I was looking for something like this! ;-)
what other tiles are you working on Emanuele?