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If a line is completed, then we iterate through all its ten columns to remove it. in .NET Produce code128b in .NET If a line is completed, then we iterate through all its ten columns to remove it.

If a line is completed, then we iterate through all its ten columns to remove it. using barcode printer for .net vs 2010 control to generate, create code 128 code set a image in .net vs 2010 applications. WinForms fieldArray[i][j]=0;. This clears the game field bringing back fieldArray[i][j] element at 0. removeChild(getChild VS .NET Code 128 Code Set A ByName("r"+i+"c"+j));. And this removes the corresponding DisplayObject, easily located by its name. Now, we have to manage "floating" lines..

Managing remaining lines When a line is remov ed, probably there are some tetrominoes above it, just like in the previous picture. Obviously you can"t leave the game field as is, but you have to make the above pieces fall down to fill the removed lines. The idea: Check all pieces above the removed line and move them down to fill the gap left by the removed line.

The development: We can do it by simply moving down one tile, all tetrominoes pieces above the line we just deleted, and updating fieldArray array consequently. Change checkForLines function this way:. private function che Code 128 Code Set C for .NET ckForLines():void { for (var i:int=0; i<20; i++) { if (fieldArray[i].indexOf(0)==-1) { for (var j:int=0; j<10; j++) { fieldArray[i][j]=0; removeChild(getChildByName("r"+i+"c"+j)); } for (j=i; j>=0; j--) { [ 175 ].

Tetris for (var k:in t=0; k<10; k++) { if (fieldArray[j][k]==1) { fieldArray[j][k]=0; fieldArray[j+1][k]=1; getChildByName("r"+j+"c"+k).y+=TS; getChildByName("r"+j+"c"+k).name="r"+(j+1)+"c"+k; } } } } } }.

Let"s see what we ar VS .NET barcode code 128 e going to do:. for (j=i; j>=0; j--) { ...

}. This is the most imp Code 128 Code Set A for .NET ortant loop. It ranges from i (the row we just cleared) back to zero.

In other words, we are scanning all rows above the row we just cleared, including it.. for (var k:int=0; k& lt;10; k++) { ...

}. This for loop iterates trough all 10 elements in the j-th row. if (fieldArray[j][k] ==1) { ...

}. Checks if there is a tetromino piece in the k-th column of the j-th row. fieldArray[j][k]=0;. Sets the k-th column of the j-th row to 0. fieldArray[j+1][k]=1;. Sets the k-th column of the (j+1)-th row to 1. This way we are shifting down an entire line. getChildByName("r"+j +"c"+k).y+=TS;. Moves down the corresponding DisplayObject by TS pixels. getChildByName("r"+j +"c"+k).name="r"+(j+1)+"c"+k;. Changes the correspo VS .NET Code 128 nding DisplayObject name according to its new position. Test the game and try to remove one or more lines.

Everything will work properly.. [ 176 ]. 5 . Now, to make the player"s life harder, we can make tetrominoes fall down by themselves. Making tetrominoes fall One major feature st ill lacking in this prototype is the gravity that makes tetrominoes fall down at a given interval of time. With the main engine already developed and working, it"s just a matter of adding a timer listener and doing the same thing as the player presses DOWN arrow key. The idea: After a given amount of time, make the tetromino controlled by the player move down by one line.

The development: First, add a new class level variable.. private private priv barcode standards 128 for .NET ate private private private private private private private private const TS:uint=24; var fieldArray:Array; var fieldSprite:Sprite; var tetrominoes:Array = new Array(); var colors:Array=new Array(); var tetromino:Sprite; var currentTetromino:uint; var currentRotation:uint; var tRow:int; var tCol:int; var timeCount:Timer=new Timer(500);. timeCount is the variable that will trigger the event listener every 500 milliseconds. The timer listener will be added once a new tetromino is generated. [ 177 ]. Tetris Modify generateTetro mino function this way:. private function gen Code 128 Code Set C for .NET erateTetromino():void { ..

. timeCount.addEventListener(TimerEvent.

TIMER, onTime); timeCount.start(); }. You already know how this listener works so this was easy, and writing onTime function will be even easier as it"s just a copy/paste of the code to execute when the player presses DOWN arrow key (case 40).. private function onT visual .net Code 128C ime(e:TimerEvent):void { if (canFit(tRow+1,tCol,currentRotation)) { tRow++; placeTetromino(); } else { landTetromino(); generateTetromino(); } }. The listener also ne eds to be removed once the tetromino lands, to let the script create a brand new one when a new tetromino is placed on the game field. Remove it in landTetromino function this way:. private function lan visual .net Code 128C dTetromino():void { var ct:uint=currentTetromino; var landed:Sprite; for (var i:int=0; i<tetrominoes[ct][currentRotation].length; i++) { .

.. } removeChild(tetromino); timeCount.

removeEventListener(TimerEvent.TIMER, onTime); timeCount.stop(); checkForLines(); }.

Test the movie, and tetrominoes will fall down one row every 500 milliseconds. Now you have to think quickly, or you"ll stack tetrominoes until you reach the top of the game field..

[ 178 ]. 5 . Checking for game over Finally it"s time to tell the player the game is over. The idea: If the tetromino that just appeared on the top of the game field collides with tetrominoes pieces, the game is over. The development: First we need a new class level variable:.

private private priv Code-128 for .NET ate private private private private private private private private private const TS:uint=24; var fieldArray:Array; var fieldSprite:Sprite; var tetrominoes:Array = new Array(); var colors:Array=new Array(); var tetromino:Sprite; var currentTetromino:uint; var currentRotation:uint; var tRow:int; var tCol:int; var timeCount:Timer=new Timer(500); var gameOver:Boolean=false;. gameOver variable wi ll tell us if the game is over (true) or not (false). At the beginning obviously, the game is not over..

What should happen w barcode standards 128 for .NET hen the game is over First, the player shouldn"t be able to move the current tetromino, so change onKDown function this way:. private function onK Down(e:KeyboardEvent):void { if (! gameOver) { ...

} }. Then, no more tetrom VS .NET Code-128 inoes should be generated. Change generateTetromino function this way:.

private function gen erateTetromino():void { if (! gameOver) { currentTetromino=Math.floor(Math.random()*7); currentRotation=0; tRow=0; if (tetrominoes[currentTetromino][0][0].

indexOf(1)==-1) { tRow=-1; } tCol=3; drawTetromino(); [ 179 ]. Tetris if (canFit(tR Code 128A for .NET ow,tCol,currentRotation)) { timeCount.addEventListener(TimerEvent.

TIMER, onTime); timeCount.start(); } else { gameOver=true; } } }. The first if statement:. if (! gameOver) { ...

}. executes the whole f unction only if gameOver variable is false. Then the event listener is added only if canFit function applied to the tetromino in its starting position returns true. If not, this means the tetromino cannot fit even in its starting position, so the game is over, and gameOver variable is set to true.

Test the movie and try to stack tetrominoes until you reach the top of the game field, and the game will stop.. In the previous pict .net vs 2010 barcode 128 ure, when the "T" tetromino is added, it"s game over. Last but not least, we must show which tetromino will appear when the player lands the current one.

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