Tetris
/**
* Copyright flashrod ( http://wonderfl.net/user/flashrod )
* MIT License ( http://www.opensource.org/licenses/mit-license.php )
* Downloaded from: http://wonderfl.net/c/d3L4
*/
package {
import flash.display.Sprite;
import flash.text.TextField;
import flash.events.Event;
import flash.events.KeyboardEvent;
public class Tetris extends Sprite {
private const W:int = 10;
private const H:int = 20;
private const UNIT:int = 16;
private const COLOR:Array =[0x000000, 0x00FFFF, 0xFFFF00, 0x22FF22, 0xFF2222, 0x4444FF, 0xFF8844, 0xFF22FF];
private const PAT:Array =[[[1, 1, 1, 1]],
[[0, 2, 0], [2, 2, 2]],
[[3, 3, 0], [0, 3, 3]],
[[0, 4, 4], [4, 4, 0]],
[[5, 5], [5, 0], [5, 0]],
[[6, 6], [0, 6], [0, 6]],
[[7, 7], [7, 7]]];
private const SPEED:Array = [30, 20, 10, 5];
private const VK_H:int = 72; // h
private const VK_J:int = 74; // j
private const VK_K:int = 75; // k
private const VK_L:int = 76; // l
private const VK_SPC:int = 32; // space
private var field:Array = [];
private var piece:Array;
private var next:Array;
private var text:TextField = new TextField();
private var keytable:Array = [];
private var count:int = 0;
private var step:int = 0;
private var px:int;
private var py:int;
public function Tetris() {
text.x = W*UNIT;
text.text="Next:";
addChild(text);
var t:TextField = new TextField();
t.x = W * UNIT;
t.y = 8 * UNIT;
t.text = "usage: h,j,k,l,SPACE";
addChild(t);
field = new Array(H).map(function():*{
return new Array(W).map(function():*{
return 0;
})
});
keytable[VK_H] = function():void {px -= space(px-1, py, piece)};
keytable[VK_J] = function():void {rotate(true)};
keytable[VK_K] = function():void {rotate(false)};
keytable[VK_L] = function():void {px += space(px+1, py, piece)};
keytable[VK_SPC] = function():void {drop(); pick();};
stage.addEventListener(KeyboardEvent.KEY_DOWN, function(e:KeyboardEvent):void {
if (keytable[e.keyCode]) {
keytable[e.keyCode]();
repaint();
}
});
pick();
pick();
addEventListener(Event.ENTER_FRAME, function(e:Event):void {
if (--step < 0) {
step=SPEED[int(count/10)];
if (space(px, py+1, piece)) {
++py;
repaint();
} else {
drop();
pick();
}
}
});
}
private function rotate(clock:Boolean):void {
var r:Array = new Array(piece[0].length).map(function():*{return [];});
for (var j:int = 0; j<piece.length; ++j)
for (var i:int = 0; i < r.length; ++i)
if (clock)
r[i][piece.length-1-j] = piece[j][i];
else
r[r.length-1-i][j] = piece[j][i];
if (space(px, py, r))
piece = r;
}
private function repaint():void {
graphics.clear();
for (var j:int = 0; j < H; ++j)
for (var i:int = 0; i < W; ++i) {
var g:int = 0;
if (py <= j && j < (py+piece.length) && px <= i && i < (px+piece[0].length))
g = piece[j-py][i-px];
if (g == 0)
g = field[j][i];
graphics.beginFill(COLOR[g]);
graphics.drawRect(i*UNIT, j*UNIT, UNIT, UNIT);
}
for (j = 0; j < next.length; ++j)
for (i = 0; i < next[j].length; ++i) {
graphics.beginFill(COLOR[next[j][i]]);
graphics.drawRect((i+W+1)*UNIT, (j+2)*UNIT, UNIT, UNIT);
}
}
private function space(x:int, y:int, p:Array):int {
for (var j:int = 0; j < p.length; ++j) {
if (0 > (y+j) || (y+j) >= H)
return 0;
for (var i:int = 0; i < p[j].length; ++i) {
if (0 > (x+i) || (x+i) >= W)
return 0;
if (p[j][i] && field[y+j][x+i])
return 0;
}
}
return 1;
}
private function drop():void {
for (; space(px, py+1, piece); py++)
;
for (var j:int = 0; j < piece.length; ++j)
for (var i:int = 0; i < piece[j].length; ++i)
if (piece[j][i])
field[py+j][px+i] = piece[j][i];
for (j=0; j<H; ++j)
if (field[j].indexOf(0) < 0) {
field.splice(j, 1);
field.unshift([]);
for (i=0; i<W; ++i)
field[0][i] = 0;
}
count++;
if (count/10 >= SPEED.length)
count = 0;
}
private function pick():void {
piece = next;
if (piece != null) {
px = (W-piece[0].length)/2;
py = 0;
if (!space(px, py, piece))
text.text="GAME OVER";
}
next = PAT[int(Math.random()*PAT.length)];
}
}
}