Complete Bejeweled game in less than 2KB – legible version
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Do you remember the Complete Bejeweled game in less than 2KB?
Putting a Bejeweled game into only 2K made the code look a bit unclear, but Brook Jordan shares his readable version with us.
Slightly more legible now, with proper variable names and comments.
package {
import flash.display.Sprite;
import flash.events.MouseEvent;
import flash.events.Event;
import flash.text.TextField;
public class bejewelled extends Sprite {
private var gems_array:Array=new Array();
private var aGem:Sprite;
private var selectorBox:Sprite=new Sprite();
private var selectorRow:int=-10;
private var selectorColumn:int=-10;
private var red:uint = 0xFF0000;
private var green:uint = 0xFF00;
private var blue:uint = 0xFF;
private var yellow:uint = 0xFFFF00;
private var cyan:uint = 0xFFFF;
private var magenta:uint = 0xFF00FF;
private var white:uint = 0xFFFFFF;
private var colours_array:Array=new Array(red,green,blue,yellow,cyan,magenta,white);
private var clickPossible:Boolean=false;
private var score_txt:TextField=new TextField();
private var hint_txt:TextField=new TextField();
private var score:uint=0;
private var inaRow:uint=0;
private var match:Boolean = true;
public function bejewelled() {
// Game initiation
// Create and style score text
addChild(score_txt);
score_txt.textColor=0xFFFFFF;
score_txt.x=500;
// Create and style hint text
addChild(hint_txt);
hint_txt.textColor=0xFFFFFF;
hint_txt.x=550;
// Create Gems in rows and columns
for (var i:uint=0; i<8; i++) {
gems_array[i]=new Array();
for (var j:uint=0; j<8; j++) {
do {
gems_array[i][j]=Math.floor(Math.random()*7);
}
while (rowLineLength(i,j)>2 || columnLineLength(i,j)>2);
aGem=new Sprite();
aGem.graphics.beginFill(colours_array[gems_array[i][j]]);
aGem.graphics.drawCircle(30,30,29);
aGem.graphics.endFill();
aGem.name=i+"_"+j;
aGem.x=j*60;
aGem.y=i*60;
addChild(aGem);
}
}
// Create and style selector box
addChild(selectorBox);
selectorBox.graphics.lineStyle(2,red,1);
selectorBox.graphics.drawRect(0,0,60,60);
selectorBox.visible=false;
// Listen for user input
stage.addEventListener(MouseEvent.CLICK,onClick);
addEventListener(Event.ENTER_FRAME,everyFrame);
}
// Every frame...
private function everyFrame(e:Event):void {
//Assume that gems are not falling
var gemsAreFalling:Boolean=false;
// Check each gem for space below it
for (var i:int=6; i>=0; i--) {
for (var j:uint=0; j<8; j++) {
// If a spot contains a gem, and has an empty space below...
if (gems_array[i][j] != -1 && gems_array[i+1][j]==-1) {
// Set gems falling
gemsAreFalling=true;
gems_array[i+1][j]=gems_array[i][j];
gems_array[i][j]=-1;
getChildByName(i+"_"+j).y+=60;
getChildByName(i+"_"+j).name=(i+1)+"_"+j;
break;
}
}
// If a gem is falling
if (gemsAreFalling) {
// don't allow any more to start falling
break;
}
}
// If no gems are falling
if (! gemsAreFalling) {
// Assume no new gems are needed
var needNewGem:Boolean=false;
// but check all spaces...
for (i=7; i>=0; i--) {
for (j=0; j<8; j++) {
// and if a spot is empty
if (gems_array[i][j]==-1) {
// now we know we need a new gem
needNewGem=true;
// pick a random color for the gem
gems_array[0][j]=Math.floor(Math.random()*7);
// create the gem
aGem=new Sprite();
aGem.graphics.beginFill(colours_array[gems_array[0][j]]);
aGem.graphics.drawCircle(30,30,29);
aGem.graphics.endFill();
// ID it
aGem.name="0_"+j;
// position it
aGem.x=j*60;
aGem.y=0;
// show it
addChild(aGem);
// stop creating new gems
break;
}
}
// if a new gem was created, stop checking
if (needNewGem) {
break;
}
}
// If no new gems were needed...
if (! needNewGem) {
// assume no more/new lines are on the board
var moreLinesAvailable:Boolean=false;
// check all gems
for (i=7; i>=0; i--) {
for (j=0; j<8; j++) {
// if a line is found
if (rowLineLength(i,j)>2 || columnLineLength(i,j)>2) {
// then we know more lines are available
moreLinesAvailable=true;
// creat a new array, set the gem type of the line, and where it is
var lineGems:Array=[i+"_"+j];
var gemType:uint=gems_array[i][j];
var linePosition:int;
// check t's a horizontal line...
if (rowLineLength(i,j)>2) {
// if so, find our how long it is and put all the line's gems into the array
linePosition=j;
while (sameGemIsHere(gemType,i,linePosition-1)) {
linePosition--;
lineGems.push(i+"_"+linePosition);
}
linePosition=j;
while (sameGemIsHere(gemType,i,linePosition+1)) {
linePosition++;
lineGems.push(i+"_"+linePosition);
}
}
// check t's a vertical line...
if (columnLineLength(i,j)>2) {
// if so, find our how long it is and put all the line's gems into the array
linePosition=i;
while (sameGemIsHere(gemType,linePosition-1,j)) {
linePosition--;
lineGems.push(linePosition+"_"+j);
}
linePosition=i;
while (sameGemIsHere(gemType,linePosition+1,j)) {
linePosition++;
lineGems.push(linePosition+"_"+j);
}
}
// for all gems in the line...
for (i=0; i0&&mouseY<480&&mouseY>0) {
// Find which row and column were clicked
var clickedRow:uint=Math.floor(mouseY/60);
var clickedColumn:uint=Math.floor(mouseX/60);
// Check if the clicked gem is adjacent to the selector
// If not...
if (!(((clickedRow==selectorRow+1 || clickedRow==selectorRow-1)&&clickedColumn==selectorColumn)||((clickedColumn==selectorColumn+1 || clickedColumn==selectorColumn-1) && clickedRow==selectorRow))) {
// Find row and colum the selector should move to
selectorRow=clickedRow;
selectorColumn=clickedColumn;
// Move it to the chosen position
selectorBox.x=60*selectorColumn;
selectorBox.y=60*selectorRow;
// If hidden, show it.
selectorBox.visible=true;
}
// If it is not next to it...
else {
// Swap the gems;
swapGems(selectorRow,selectorColumn,clickedRow,clickedColumn);
// If they make a line...
if (rowLineLength(selectorRow,selectorColumn)>2 || columnLineLength(selectorRow,selectorColumn)>2||rowLineLength(clickedRow,clickedColumn)>2 || columnLineLength(clickedRow,clickedColumn)>2) {
// remove the hint text
hint_txt.text="";
// dis-allow a new move until cascade has ended (removes glitches)
clickPossible=false;
// move and rename the gems
getChildByName(selectorRow+"_"+selectorColumn).x=clickedColumn*60;
getChildByName(selectorRow+"_"+selectorColumn).y=clickedRow*60;
getChildByName(selectorRow+"_"+selectorColumn).name="t";
getChildByName(clickedRow+"_"+clickedColumn).x=selectorColumn*60;
getChildByName(clickedRow+"_"+clickedColumn).y=selectorRow*60;
getChildByName(clickedRow+"_"+clickedColumn).name=selectorRow+"_"+selectorColumn;
getChildByName("t").name=clickedRow+"_"+clickedColumn;
match = true;
}
// If not...
else {
// Switch them back
swapGems(selectorRow,selectorColumn,clickedRow,clickedColumn);
match = false;
}
if (match) {
// Move the selector position to default
selectorRow=-10;
selectorColumn=-10;
// and hide it
selectorBox.visible=false;
}
else {
// Set the selector position
selectorRow=clickedRow;
selectorColumn=clickedColumn;
// Move the box into position
selectorBox.x=60*selectorColumn;
selectorBox.y=60*selectorRow;
match = false;
// If hidden, show it.
selectorBox.visible=true;
}
}
}
// If the click is outside the game area
else {
// For gems in all rows...
for (var i:uint=0; i<8; i++) {
// and columns...
for (var j:uint=0; j<8; j++) {
// if they're not too close to the side...
if (i<7) {
// swap them horizontally
swapGems(i,j,i+1,j);
// check if they form a line
if ((rowLineLength(i,j)>2||columnLineLength(i,j)>2||rowLineLength(i+1,j)>2||columnLineLength(i+1,j)>2)) {
// if so, name the move made
selectorBox.x = j*60;
selectorBox.y = i*60;
selectorBox.visible = true;
hint_txt.text = (i+1).toString()+","+(j+1).toString()+"->"+(i+2).toString()+","+(j+1).toString();
}
// swap the gems back
swapGems(i,j,i+1,j);
}
// then if they're not to close to the bottom...
if (j<7) {
// swap it vertically
swapGems(i,j,i,j+1);
// check if it forms a line
if ((rowLineLength(i,j)>2||columnLineLength(i,j)>2||rowLineLength(i,j+1)>2||columnLineLength(i,j+1)>2) ) {
// if so, name it
selectorBox.x = j*60;
selectorBox.y = i*60;
selectorBox.visible = true;
hint_txt.text = (i+1).toString()+","+(j+1).toString()+"->"+(i+1).toString()+","+(j+2).toString();
}
// swap the gems back
swapGems(i,j,i,j+1);
}
}
}
}
}
}
//Swap given gems
private function swapGems(fromRow:uint,fromColumn:uint,toRow:uint,toColumn:uint):void {
//Save the original position
var originalPosition:uint=gems_array[fromRow][fromColumn];
//Move original gem to new position
gems_array[fromRow][fromColumn]=gems_array[toRow][toColumn];
//move second gem to saved, original gem's position
gems_array[toRow][toColumn]=originalPosition;
}
//Find out if there us a horizontal line
private function rowLineLength(row:uint,column:uint):uint {
var gemType:uint=gems_array[row][column];
var lineLength:uint=1;
var checkColumn:int=column;
//check how far left it extends
while (sameGemIsHere(gemType,row,checkColumn-1)) {
checkColumn--;
lineLength++;
}
checkColumn=column;
//check how far right it extends
while (sameGemIsHere(gemType,row,checkColumn+1)) {
checkColumn++;
lineLength++;
}
// return total line length
return (lineLength);
}
//Find out if there us a vertical line
private function columnLineLength(row:uint,column:uint):uint {
var gemType:uint=gems_array[row][column];
var lineLength:uint=1;
var checkRow:int=row;
//check how low it extends
while (sameGemIsHere(gemType,checkRow-1,column)) {
checkRow--;
lineLength++;
}
//check how high it extends
checkRow=row;
while (sameGemIsHere(gemType,checkRow+1,column)) {
checkRow++;
lineLength++;
}
// return total line length
return (lineLength);
}
private function sameGemIsHere(gemType:uint,row:int,column:int):Boolean {
//Check there are gems in the chosen row
if (gems_array[row]==null) {
return false;
}
//If there are, check if there is a gem in the chosen slot
if (gems_array[row][column]==null) {
return false;
}
//If there is, check if it's the same as the chosen gem type
return gemType==gems_array[row][column];
}
}
}
And the final size? 2.711 bytes, a 33% larger than the original code.
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