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ControlGroup.js
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ControlGroup.js
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/**
* The blocks that can be moved nby the user
* @param {Array} blocks - an array of [Block] of size 4 that can be operated on
* @param {Char} shape - the block type: i, o, j, l, s, z, t
* @param {function({Number}x, {Number}y)} isLegalCallback - a function that retursn true if a block can be moved
* to the new position
*/
function ControlGroup(blocks, shape, isLegalCallback) {
var i,
newX, newY,
shapeConf;
// place the blocks according to the shape
shapeConf = SHAPES[shape];
this.pos = shapeConf.pos;
this.spin = shapeConf.spin;
this.bottomed = false;
this.blocks = blocks;
this.baseX = shapeConf.startX;
this.baseY = shapeConf.startY;
this.shape = shape;
this.kickOffsets = WALL_KICK_OFFSETS[shapeConf.kickType];
this.dir = 0;
this.isIllegalStart = false;
this.isLegalCallback = isLegalCallback || function() {return true;};
this.lastWasSpin = false;
for (i = 0; i < blocks.length; i += 1) {
newX = this.baseX + this.pos[i].x;
newY = this.baseY + this.pos[i].y;
// see if the block placement is illegal before placing
if (!this.isLegalCallback(newX, newY)) {
this.isIllegalStart = true;
}
this.blocks[i].setPosition(newX, newY);
}
this.updateBottomedState();
}
/**
* if the position is legal
* @param {Number} x
* @param {Number} y
* @returns {Boolean} true iff the position is legal to move to
*/
ControlGroup.prototype.isLegalPosition = function (x, y) {
var i,
blocks = this.blocks;
// if it's a currently occupied, it must be legal
for (i = 0; i < 4; i += 1) {
if (blocks[i].isPosition(x, y)) {
return true;
}
}
// if it's still not proven legal, then defer to the game to decide
return this.isLegalCallback(x, y);
};
/**
* Shift the block left or right
* @param {Boolean} left - true to shift left false to shift right
* @returns {Boolean} true iff the shift was successful
*/
ControlGroup.prototype.shift = function(left) {
var dx = (left ? -1 : 1),
i;
for (i = 0; i < 4; i += 1) {
if (!this.isLegalPosition(this.blocks[i].getX()+dx, this.blocks[i].getY())) {
return false;
}
}
this.lastWasSpin = false;
this.baseX += dx;
for (i = 0; i < this.blocks.length; i += 1) {
this.blocks[i].moveBlock(dx, 0);
}
this.updateBottomedState();
return true;
};
ControlGroup.prototype.updateBottomedState = function() {
var i;
for (i = 0; i < this.blocks.length; i += 1) {
if (!this.isLegalPosition(this.blocks[i].getX(), this.blocks[i].getY() + 1)) {
this.bottomed = true;
return;
}
}
this.bottomed = false;
};
/**
* Drop the block by one
*/
ControlGroup.prototype.drop = function() {
var i;
// don't drop if bottomed
if (this.bottomed) {
return;
}
this.lastWasSpin = false;
this.baseY += 1;
for (i = 0; i < this.blocks.length; i += 1) {
this.blocks[i].moveBlock(0, 1);
}
this.updateBottomedState();
};
/**
* @returns {Boolean} true if the block is bottomed and another shoudl spawn
*/
ControlGroup.prototype.isBottomed = function() {
return this.bottomed;
};
/**
* Turns the block
* @param {Boolean} cw - true for clockwise, false for counter-clockwise
* @returns {Boolean} true iff the block was successfully turned
*/
ControlGroup.prototype.turn = function(cw) {
var kick,
newPos = null,
direction = cw ? 'cw' : 'ccw',
availableKicks = this.kickOffsets[this.dir][direction],
i;
// for possible each kick offset
for (i = 0; i < availableKicks.length; i += 1) {
kick = availableKicks[i];
newPos = this.tryTurn(cw, kick);
if (newPos) {
break;
}
}
// if there s still no valid rotation, fail
if (!newPos) {
return false;
}
this.lastWasSpin = true;
// must be legal at this point move the bocks
for (i = 0; i < 4; i += 1) {
this.blocks[i].setPosition(newPos[i].x, newPos[i].y);
}
this.baseX += kick.x;
this.baseY += kick.y;
// keep track of the direction
if (cw) {
this.dir += 1;
if (this.dir === 4) {
this.dir = 0;
}
} else {
this.dir -= 1;
if (this.dir === -1) {
this.dir = 3;
}
}
this.updateBottomedState();
return true;
};
/**
* Checks if the given rotation and kick is valid.
* @param {Boolean} cw - true if cw, false if ccw
* @param {Object} kick - the kick offset x/y object to try
* @returns {Array} and array of x/y objects if valid, null if not valid
*/
ControlGroup.prototype.tryTurn = function (cw, kick) {
var newX, newY,
oldX, oldY,
i,
newPos = [],
curPos;
if (this.spin === 'block') {
for (i = 0; i < this.blocks.length; i += 1) {
newX = (cw ? -1 : 1) * (this.blocks[i].blockY - this.baseY) + this.baseX + kick.x;
newY = (cw ? 1 : -1) * (this.blocks[i].blockX - this.baseX) + this.baseY + kick.y;
newPos[i] = {x: newX, y: newY};
}
} else {
// point turning
for (i = 0; i < this.blocks.length; i += 1) {
oldX = this.blocks[i].blockX - this.baseX;
oldY = this.blocks[i].blockY - this.baseY;
if (oldX >= 0) { oldX += 1; }
if (oldY >= 0) { oldY += 1; }
newX = (cw ? -1 : 1) * oldY;
newY = (cw ? 1 : -1) * oldX;
if (newX > 0) { newX -= 1; }
if (newY > 0) { newY -= 1; }
newPos[i] = {x: newX + this.baseX + kick.x, y: newY + this.baseY + kick.y};
}
}
// for each block
for (i = 0; i < 4; i += 1) {
curPos = newPos[i];
if (!this.isLegalPosition(curPos.x, curPos.y)) {
return null;
}
}
return newPos;
};
/**
* Gets the positions that the block will use when it falls
* @returns {Object} {dist:{Number}, positions: {[Object]} array of hashs of {x: Number, y: Number}}
*/
ControlGroup.prototype.getFallPositions = function () {
var res = [],
dist = 0,
i,
curBlock,
notDone = true;
while (notDone) {
dist += 1;
// for each block
for (i = 0; i < 4 && notDone; i += 1) {
curBlock = this.blocks[i];
// if it's not a legal position
if (!this.isLegalPosition(curBlock.getX(), curBlock.getY() + dist)) {
// back up one and stop dropping
dist -= 1;
notDone = false;
}
}
}
// for each block
for (i = 0; i < 4; i += 1) {
curBlock = this.blocks[i];
res.push({x: curBlock.getX(), y: curBlock.getY() + dist});
}
return {dist: dist, positions: res};
};
/**
* makes the block fall all the way to the bottom
* forces the next cycle to be recognized as bottomed
* @returns {Number} the distance fallen
*/
ControlGroup.prototype.fall = function() {
var fall = this.getFallPositions(),
positions = fall.positions,
dist = fall.dist,
i, curPos;
if (dist !== 0) {
this.lastWasSpin = false;
}
// for each block
for (i = 0; i < 4; i += 1) {
curPos = positions[i];
this.blocks[i].setPosition(curPos.x, curPos.y);
}
this.bottomed = true;
return dist;
};
/**
* Sets the preview blocks to the approproriate positions
* @param {[Block]} previews - the 4 blocks to be modified to be put into position as preview blocks
*/
ControlGroup.prototype.configurePreviewBlocks = function(previews) {
var positions = this.getFallPositions().positions,
i;
for (i = 0; i < 4; i += 1) {
previews[i].setPosition(positions[i].x, positions[i].y);
}
};
ControlGroup.prototype.getShape = function () {
return this.shape;
};
ControlGroup.prototype.getBlocks = function () {
return this.blocks;
};
/*
* Gets the type of T spin that the group is in
* @returns {String} 'mini' for a mini-t, 'normal' for a normal t, null for not a t spin
*/
ControlGroup.prototype.getTSpin = function() {
var i,
testPoints = [{x:-1,y:-1},{x:1,y:-1},{x:1,y:1},{x:-1,y:1}],
count = 0,
mini = false,
curPoint;
if (!this.lastWasSpin) {
return null;
}
// make sure it's actually a t
if (this.shape !== 't') {
return null;
}
// t-spin mini tests
if (this.dir === 0) {
testPoints[0].miniCheck = true;
testPoints[1].miniCheck = true;
} else if (this.dir === 1) {
testPoints[1].miniCheck = true;
testPoints[2].miniCheck = true;
} else if (this.dir === 2) {
testPoints[2].miniCheck = true;
testPoints[3].miniCheck = true;
} else if (this.dir === 3) {
testPoints[3].miniCheck = true;
testPoints[0].miniCheck = true;
}
// 3 point t test
for (i = 0; i < 4; i += 1) {
curPoint = testPoints[i]
if (!this.isLegalPosition(this.baseX + curPoint.x, this.baseY + curPoint.y)) {
count += 1;
} else if (curPoint.miniCheck) {
mini = true;
}
}
if (count >= 3) {
if (mini) {
return 'mini';
}
return 'normal';
}
return null;
};