Images and Graphics . 495 //noactiveblockssousercannotmoveanythingwithbuttonsclearActive()
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494 . Chapter 23 // a shape is currently falling so move it one square downwards moveY() // call after speed milliseconds timerID = setTimeout(’play()’, speed) } // constructs an object representing a specific position function characteristics(x, y) { // create property to hold status (block or empty) this.state = state(x, y) // if block found in specified position if (state(x, y)) { // local variable to hold URL of image at specified location var src = document.images[computeIndex(x, y)].src // local variable to hold color (0, 1, 2, …, 6) var color = src.charAt(src.lastIndexOf(’/') + 2) } else // no color because no block found at specified position color = 1 // convert color from string to integer and assign to property this.color = parseInt(color) // create property to hold square’s current state (active or not, 1 or 0) this.activity = ar[x][y] } // contructs a map of entire board and status function fullMap() { for (varx=0;x<10; ++x) { this[x] = new Array(10) for (vary=0;y<19; ++y) { this[x][y] = new characteristics(x, y) } } this.shape = shape } // pause and unpause game function pause() { // if game is not paused if (!paused) { // stop timer clearTimeout(timerID) // game is now paused paused = true // create global map of board map = new fullMap() // flood board so player cannot see current status flood(1)
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Images and Graphics . 493 alert(”You are a champion!”) // scan screen from one line above the complete one to top of screen for (y = aLine 1; y >= 0; –y) { for (varx=0;x<10; ++x) { // if current square is on if (state(x, y)) // call function to warp it down warp(x, y, x, y + 1) else { // clear square below (similar to a warp because // initial square is off) setSquare(x, y + 1, 0) } } } // recursive call (maybe more than one line was completed) dropLines() } // no square should be active clearActive() } // main function responsible for game action function play() { // place values in form fields (display) document.lineslevel.lines.value = lines document.lineslevel.level.value = level // if no shape is falling if (noActive()) { // check for line completions and drop them dropLines() // insert a new shape (if shape is not able to enter) if (!insertShape()) 23{ // flood screen to black flood(1) // flood screen to blank flood(0) // display final results alert('Game over!rrlevel='+ level + 'rlines = '+ lines) // clear timeout clearTimeout(timerID) // timer is not running timerRunning = false // terminate function (and game) return } } else Chapter
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492 . Chapter 23 tempLevel = prompt(”Enter level to begin game (0 10):”, “0″) // if user cancelled prompt if (!tempLevel) // abort function return // tempLevel is the actual level level = tempLevel // clear states, blocks, and timer clearActive() flood(0) clearTimeout(timerID) // clear statistics for (vari=0;i<7; ++i) { statistics[i] = 0 } // convert input from string to integer level = parseInt(level) // calculate speed speed = 800 (level * 80) // game begins withno lines completed! lines = 0 // game starts timerRunning = true // game is not paused for sure paused = false // start actual playing play() } // check if lines have been completed and drop accordingly function dropLines() { // on line has been found var aLine = 1 // scan screen from top to bottom and stop when first complete line is found and assigned for (vary=0;y<19; ++y) { if (isLine(y)) { aLine = y break } } // if a complete line has been found if (aLine != 1) { // increment lines lines++ // if enoughlines have been made increment level if (lines > level * 10 + 9) level++ if (level == 11)
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Images and Graphics . 491 for (vary=0;y<19; ++y) { if (state == 0) document.images[computeIndex(x, y)].src = off.src else document.images[computeIndex(x, y)].src = on[3].src } } } // return true if no active squares are found and false otherwise function noActive() { // scan board from top to bottom for (vary=0;y<19; ++y) { for (varx=0;x<10; ++ x) { if (ar[x][y] == 1) return false } } // no active square found on the board return true } // return true if the line with the given coordinate is completed function isLine(y) { // horizontal scan of current line for (varx=0;x<10; ++x) { // if a square is off the line is not completed if (!state(x, y)) return false } // no square was found off return true } 23 // move block from one position to another function warp(startX, startY, endX, endY) { document.images[computeIndex(endX, endY)].src = document.images [computeIndex(startX, startY)].src document.images[computeIndex(startX, startY)].src = off.src // block in new position is now active ar[endX][endY] = 1 // previous position is no longer active ar[startX][startY] = 0 } // function that starts game (*works with global variables only*) function start() { // accept level from user (no validation to save space) Chapter
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490 . Chapter 23 if (shape == 4) if (curMap.length== 3) complexWarp(curMap.offsetX, curMap.offsetY + 1, curMap.offsetX, curMap.offsetY, curMap.offsetX + 2, curMap.offsetY, curMap.offsetX, curMap.offsetY 1) else complexWarp(curMap.offsetX, curMap.offsetY, curMap.offsetX + 2, curMap.offsetY + 1, curMap.offsetX, curMap.offsetY + 1, curMap.offsetX, curMap.offsetY + 2) if (shape == 5) if (curMap.length== 3 && state(curMap.offsetX, curMap.offsetY)) complexWarp(curMap.offsetX + 2, curMap.offsetY, curMap.offsetX + 1, curMap.offsetY 1) else if (curMap.length== 2 && state(curMap.offsetX + 1, curMap.offsetY)) complexWarp(curMap.offsetX + 1, curMap.offsetY + 2, curMap.offsetX + 2, curMap.offsetY + 1) else if (curMap.length== 3) complexWarp(curMap.offsetX, curMap.offsetY + 1, curMap.offsetX + 1, curMap.offsetY + 2) else complexWarp(curMap.offsetX, curMap.offsetY, curMap .offsetX 1, curMap.offsetY + 1) if (shape == 6) if (curMap.length== 3 && state(curMap.offsetX + 1, curMap.offsetY)) complexWarp(curMap.offsetX, curMap.offsetY, curMap.offsetX, curMap.offsetY + 1, curMap.offsetX + 2, curMap.offsetY + 1, curMap.offsetX + 1, curMap.offsetY + 1, curMap.offsetX + 2, curMap.offsetY, curMap.offsetX + 1, curMap.offsetY 1) else if (curMap.length== 2 && state(curMap.offsetX + 1, curMap.offsetY + 1)) complexWarp(curMap.offsetX, curMap.offsetY + 2, curMap.offsetX, curMap.offsetY, curMap.offsetX + 1, curMap.offsetY + 2, curMap.offsetX, curMap.offsetY + 1, curMap.offsetX + 1, curMap.offsetY, curMap.offsetX + 2, curMap.offsetY + 1) else if (curMap.length== 3) complexWarp(curMap.offsetX + 1, curMap.offsetY + 1, curMap.offsetX + 1, curMap.offsetY, curMap.offsetX + 2, curMap.offsetY + 1, curMap.offsetX, curMap.offsetY + 2) else complexWarp(curMap.offsetX, curMap.offsetY, curMap.offsetX + 1, curMap.offsetY + 1, curMap.offsetX + 1, curMap.offsetY, curMap.offsetX + 2, curMap.offsetY + 1, curMap.offsetX, curMap.offsetY + 2, curMap.offsetX + 2, curMap.offsetY + 2) } // flood entire screen withgiven state function flood(state) { for (varx=0;x<10; ++x) {
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Images and Graphics . 489 else complexWarp(curMap.offsetX, curMap.offsetY + 3, curMap.offsetX 1, curMap.offsetY + 2, curMap.offsetX, curMap.offsetY + 1, curMap.offsetX + 1, curMap.offsetY + 2, curMap.offsetX, curMap.offsetY, curMap.offsetX + 2, curMap.offsetY + 2) // if shape is square if (shape == 1) // do not rotate shape because square does not change appearance after rotation return // if shape is L if (shape == 2) // if shape is L tilted 90 degrees to the right if (state(curMap.offsetX, curMap.offsetY) && curMap.length== 3) complexWarp(curMap.offsetX, curMap.offsetY + 1, curMap.offsetX + 1, curMap.offsetY + 1, curMap.offsetX + 2, curMap.offsetY, curMap.offsetX + 1, curMap.offsetY 1, curMap.offsetX, curMap.offsetY, curMap.offsetX, curMap.offsetY 1) else // if shape is L tilted 180 degrees if (state(curMap.offsetX + 1, curMap.offsetY) && curMap.length== 2) complexWarp(curMap.offsetX + 1, curMap.offsetY + 2, curMap.offsetX, curMap.offsetY + 1, curMap.offsetX + 1, curMap.offsetY, curMap.offsetX + 2, curMap.offsetY, curMap.offsetX, curMap.offsetY, curMap.offsetX + 2, curMap.offsetY + 1) else // if L is tilted 90 degrees to the left if (curMap.length== 3) complexWarp(curMap.offsetX, curMap.offsetY + 1, curMap.offsetX + 1, curMap.offsetY, curMap.offsetX + 2, curMap.offsetY, curMap.offsetX + 2, curMap.offsetY + 2, curMap.offsetX + 2, curMap.offsetY + 1, curMap.offsetX + 1, curMap.offsetY + 2) // else L is not tilted else complexWarp(curMap.offsetX, curMap.offsetY, curMap.offsetX + 1, curMap.offsetY + 1, curMap.offsetX, curMap.offsetY + 2, curMap.offsetX 1, curMap.offsetY + 2, curMap.offsetX + 1, curMap.offsetY + 2, curMap.offsetX 1, curMap.offsetY + 1) if (shape == 3) if (curMap.length== 3) complexWarp(curMap.offsetX + 1, curMap.offsetY + 1, curMap.offsetX, curMap.offsetY + 1, curMap.offsetX + 2, curMap.offsetY + 1, curMap.offsetX + 1, curMap.offsetY 1) else complexWarp(curMap.offsetX, curMap.offsetY + 2, curMap.offsetX + 1, curMap.offsetY + 2, curMap.offsetX + 1, curMap.offsetY, curMap.offsetX + 2, curMap.offsetY + 2) Chapter
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488 . Chapter 23 } // return true because shape was able to enter screen return true } // warp several squares if possible // initial x1, initial y1, destination x1, destination y1, initial x2, initial // y2, destination x2, destination y2, etc. function complexWarp() { // loop through arguments checking that each warp is valid for (vari=0;i< arguments.length; i += 4) { // if warp is not valid if (!checkWarp(arguments[i], arguments[i + 1], arguments[i + 2], arguments[i + 3])) // terminate the function --no squares warped return } // loop through arguments again --warp squares for (var i = 0; i < arguments.length; i += 4) { // call function to warp the current square corresponding to argument // coordinates warp(arguments[i], arguments[i + 1], arguments[i + 2], arguments[i + 3]) } } // check if warp is valid (used by complexWarp function) function checkWarp(startX, startY, endX, endY) { // if a destination coordinate is invalid or destination square is off // state(endX, endY) must be last due to short-circuit evaluation if (endX<0|| endX>9|| endY<0|| endY > 18 || state(endX, endY)) // return false because warp is invalid return false // return true because warp has not been proved to be invalid (it is valid) return true } // rotate the current active shape function rotate() { // create instance of shapeMap object (similar to minimum 2D array // reflecting active shape) var curMap = new shapeMap() // note: all arguments handed to complexWarp are explained in that function // if shape is4×1 line if (shape == 0) // if line is in horizontal state if (curMap.length== 4) complexWarp(curMap.offsetX, curMap.offsetY, curMap.offsetX + 1, curMap.offsetY + 1, curMap.offsetX + 2, curMap.offsetY, curMap.offsetX + 1, curMap.offsetY 1, curMap.offsetX + 3, curMap.offsetY, curMap.offsetX + 1, curMap.offsetY 2) // else line is in vertical state
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Images and Graphics . 487 { if (state(4, 2) || state(5, 2) || state(4, 3) || state(5, 3)) return false setSquare(4, 2, 1) setSquare(5, 2, 1) setSquare(4, 3, 1) setSquare(5, 3, 1) } else if (shape == 2) { if (state(3, 2) || state(4, 2) || state(5, 2) || state(3, 3)) return false setSquare(3, 2, 1) setSquare(4, 2, 1) setSquare(5, 2, 1) setSquare(3, 3, 1) } else if (shape == 3) { if (state(3, 2) || state(4, 2) || state(4, 3) || state(5, 3)) return false setSquare(3, 2, 1) setSquare(4, 2, 1) setSquare(4, 3, 1) setSquare(5, 3, 1) } else if (shape == 4) { if (state(4, 2) || state(5, 2) || state(3, 3) || state(4, 3)) return false setSquare(4, 2, 1) setSquare(5, 2, 1) setSquare(3, 3, 1) setSquare(4, 3, 1) } else if (shape == 5) { 23 if (state(3, 2) || state(4, 2) || state(5, 2) || state(4, 3)) return false setSquare(3, 2, 1) setSquare(4, 2, 1) setSquare(5, 2, 1) setSquare(4, 3, 1) } else if (shape == 6) { if (state(3, 2) || state(4, 2) || state(5, 2) || state(5, 3)) return false setSquare(3, 2, 1) setSquare(4, 2, 1) setSquare(5, 2, 1) setSquare(5, 3, 1) Chapter
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486 . Chapter 23 this.offsetX = minX this.offsetY = minY // construct minimum array containing all active squares respectively for (x = 0; x <= maxX minX; ++x) { this[x] = new Array() for (y = 0; y <= maxY minY; ++y) { this[x][y] = ar[x + minX][y + minY] } } } // random function to return an integer between 0 and 6 function getRandom() { // use random number method to find integer between 0 and 8 var randomNum = Math.round(Math.random() * 8) // call function again if random number is 0 or 8. if (randomNum == 0 || randomNum == 8) return getRandom() // 1to7=>0to6 randomNum- // update selected shape’s statistics statistics[randomNum]++ // update statistics display form (update *all* fields so user cannot // enter any value in fields) for (var shape = 0; shape < 7; ++shape) { document.stats[shape].value = statistics[shape] } // return the random number return randomNum } // inserts a shape when there is no active shape function insertShape() { // initialize *global* variable shape = getRandom() // The following segment checks if the selected shape has room to enter. // If there is no room, the game is over (function return false). // If there is room, the function inserts the shape by setting its initial coordinates. if (shape == 0) { if (state(3, 2) || state(3, 2) || state(3, 2) || state(3, 2)) return false setSquare(3, 2, 1) setSquare(4, 2, 1) setSquare(5, 2, 1) setSquare(6, 2, 1) } else if (shape == 1)
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