Talking about Drag and Match game, Game development, HTML5, Javascript, Phaser and TypeScript.
When building the pure TypeScript class with no dependencies to handle Drag and Match games, my aim was to have the class manage as much as possible of these kind of games.
Now, I finally have a class which only requires you to handle input and animations, taking care about all the rest, object pooling included.
It also features multiple combos. Have a look at this example:
Drag rows and columns and try match some items.
The red rectangle represents the game area, while the green square highlights the dummy item which is used to make items wrap around rows and columns without actually wrapping them.
Everything is managed by the class, whose constructor allows you to create a game with a lot of options:
rows: amount of rows.
columns: amount of columns.
items: amount of different items.
match: amount of equal consecutive items to define a match. Normally we define a match when we have 3 or more consecutive items, but it’s up to you.
tileSize: tile size, in pixels. Useful to let the class calculate items movements and positions for you.
startX: horizontal coordinate of the top left item, in pixels.
startY: vertical coordinate of the top left item, in pixels.
minDragDistance: minimum input movement to say the player is trying to drag a row or a column.
You don’t have to set all values, in this case the class will use default values but obviously it’s recommended to set all values.
Once you created your Drag and Match instance, with items property you get an array of objects with item positions, ready to be placed to the canvas.
Each item has a data property you can use to store your custom information, such as a Phaser sprite or anything else you may want to bind to such item.
isInputInsideBoard method, given an input coordinate, returns true if the input is inside the board, false otherwise.
handleInputMovement method, given start input coordinate an current input coordinate, calculates item movements and returns all information you need to place both the actual items and the dummy item used to fake the wraparound effect.
handleInputStop method, given start input coordinate an current input coordinate, calculate item final destination and updated the game board, returning all item information.
items property returns an array with all game items.
matches property returns an array with all board matches.
thereAreMatches property returns true if there are matches in the board, false otherwise.
removeMatches method removes the matches, if any, from the game field and returns an array with all removed items. Internally, removed items are inserted into an object pool, so you don’t have to worry about recycling items.
arrangeboard method arranges the board after a match, making items fall down and replenishing the board with new items.
logValues method is a simple method to output game board values on the console, for a debugging purpose.
Let’s see the source code, which is made of one html file and 4 TypeScript files:
index.html
The web page which hosts the game, to be run inside thegame element.
<!DOCTYPE html>
<html>
<head>
<style type = "text/css">
* {
padding: 0;
margin: 0;
}
body{
background: #000;
}
canvas {
touch-action: none;
-ms-touch-action: none;
}
</style>
<script src = "main.js"></script>
</head>
<body>
<div id = "thegame"></div>
</body>
</html>
main.ts
This is where the game is created, with all Phaser related options.
// MAIN GAME FILE
// modules to import
import Phaser from 'phaser';
import { PreloadAssets } from './preloadAssets';
import { PlayGame } from './playGame';
// object to initialize the Scale Manager
const scaleObject : Phaser.Types.Core.ScaleConfig = {
mode : Phaser.Scale.FIT,
autoCenter : Phaser.Scale.CENTER_BOTH,
parent : 'thegame',
width : 1000,
height : 800
}
// game configuration object
const configObject : Phaser.Types.Core.GameConfig = {
type : Phaser.AUTO,
backgroundColor : 0x222222,
scale : scaleObject,
scene : [PreloadAssets, PlayGame]
}
// the game itself
new Phaser.Game(configObject);
preloadAssets.ts
Here we preload all assets to be used in the game.
// CLASS TO PRELOAD ASSETS
// this class extends Scene class
export class PreloadAssets extends Phaser.Scene {
// constructor
constructor() {
super({
key : 'PreloadAssets'
});
}
// method to be execute during class preloading
preload(): void {
this.load.spritesheet('items', 'assets/items.png', {
frameWidth : 100,
frameHeight : 100
});
}
// method to be called once the instance has been created
create(): void {
// call PlayGame class
this.scene.start('PlayGame');
}
}
playGame.ts
Main game file, where we handle input and visual effects. I highlighted the lines of code that use my class. As you can see, the whole game logic is managed in only 27 lines.
// THE GAME ITSELF
// we have three possible game states: waiting (for input), dragging (the board) and arranging (the board, after a match)
enum gameState {
WAITING,
DRAGGING,
ARRANGING
}
// modules to import
import { DragAndMatch } from './dragAndMatch';
// this class extends Scene class
export class PlayGame extends Phaser.Scene {
// drag and match instance
dragAndMatch : DragAndMatch;
// graphics object to highlight dummy item
dummyHighlight : Phaser.GameObjects.Graphics;
currentState : gameState;
// constructor
constructor() {
super({
key: 'PlayGame'
});
}
create() : void {
// current game state is "waiting for input"
this.currentState = gameState.WAITING;
// setting up a drag and match game with only some options
this.dragAndMatch = new DragAndMatch({
startX : 100,
startY : 100
});
// get all game items
this.dragAndMatch.items.map((item) => {
// create a sprite and place it to posX, posY, with a "value" frame
let sprite : Phaser.GameObjects.Sprite = this.add.sprite(item.posX, item.posY, 'items', item.value);
// set sprite registration point
sprite.setOrigin(0);
// is this the dummy item?
if (item.isDummy) {
// hide dummy item
sprite.setVisible(false);
}
// save sprite information into data custom property
item.data = sprite;
});
// input listeners
this.input.on('pointerdown', this.inputStart, this);
this.input.on('pointermove', this.inputMove, this);
this.input.on('pointerup', this.inputStop, this);
// just some graphics to show game area and highlight dummy item
// values are hardcoded so if you change game configuration, you need to change these values too.
// Anyway, this does not affect the game itself
let graphics : Phaser.GameObjects.Graphics = this.add.graphics();
graphics.lineStyle(4, 0xff0000, 1);
graphics.strokeRect(100, 100, 800, 600);
this.dummyHighlight = this.add.graphics();
this.dummyHighlight.lineStyle(4, 0x00ff00, 1);
this.dummyHighlight.strokeRect(0, 0, 100, 100);
this.dummyHighlight.setVisible(false);
}
// input start callback
inputStart(pointer : Phaser.Input.Pointer) : void {
// if current state is "waiting for player input" and the input is inside the board...
if (this.currentState == gameState.WAITING && this.dragAndMatch.isInputInsideBoard(pointer.position.x, pointer.position.y)) {
// let's start dragging
this.currentState = gameState.DRAGGING;
}
}
// input move callback
inputMove(pointer : Phaser.Input.Pointer) : void {
// is the player dragging?
if (this.currentState == gameState.DRAGGING) {
// handle input movement using only starting and current coordinates
this.dragAndMatch.handleInputMovement(pointer.downX, pointer.downY, pointer.position.x, pointer.position.y).map((item) => {
// set sprite position
item.data.setPosition(item.posX, item.posY)
// set sprite proper frame according to item value
item.data.setFrame(item.value);
// is this the dumm item?
if (item.isDummy) {
// place dummy highlight graphic object
this.dummyHighlight.setPosition(item.data.x, item.data.y);
// show dummy highlight graphic object
this.dummyHighlight.setVisible(true);
// show dummy item
item.data.setVisible(true);
}
});
}
}
// input stop callback
inputStop(pointer : Phaser.Input.Pointer) : void {
// is the player dragging?
if (this.currentState == gameState.DRAGGING) {
// game state changes to "arranging the board"
this.currentState = gameState.ARRANGING;
// handle input stop using only starting and current coordinates
this.dragAndMatch.handleInputStop(pointer.downX, pointer.downY, pointer.position.x, pointer.position.y).map((item) => {
// set item position
item.data.setPosition(item.posX, item.posY);
// is this the dummy item?
if (item.isDummy) {
// hide dummy item
item.data.setVisible(false);
// hide dummy highlight graphic object
this.dummyHighlight.setVisible(false);
}
});
// call a method to remove the matches
this.removeMatches();
}
}
// method to remove the matches
removeMatches() : void {
if (this.dragAndMatch.thereAreMatches) {
// here we place the sprites to remove
let spritesToRemove : Phaser.GameObjects.Sprite[] = [];
// removeMatches method gives you a list of items to remove, and we loop through them
this.dragAndMatch.removeMatches().map((item) => {
// insert item data (the sprite) in spritesToRemove array
spritesToRemove.push(item.data);
});
// let's fade them out, the call arrangeBoard method
this.tweens.add({
targets : spritesToRemove,
alpha : 0,
duration : 150,
callbackScope : this,
onComplete : this.arrangeBoard
});
}
// no sprites to remove?
else {
// set game state to "waiting for player input"
this.currentState = gameState.WAITING;
}
}
// method to arrange the board
arrangeBoard() : void {
// here we place the sprites to be moved
let spritesToMove : Phaser.GameObjects.Sprite[] = [];
// arrangeBoard gives you a list of items to be moved
this.dragAndMatch.arrangeBoard().map((item) => {
// get item sprite, stored in data property
let sprite : Phaser.GameObjects.Sprite = item.data as Phaser.GameObjects.Sprite;
// make it visible
sprite.alpha = 1;
// set sprite position
sprite.setPosition(item.movement.startX, item.movement.startY);
// set sprite frame
sprite.setFrame(item.value);
// set some custom data, such as new vertical position and tween duration
sprite.setData({
newY : item.movement.endY,
tweenDuration : 150 * item.movement.deltaRow
});
spritesToMove.push(sprite);
});
// move the sprites with a tween
this.tweens.add({
targets : spritesToMove,
props : {
y : {
getEnd: function(target : Phaser.GameObjects.Sprite) {
return target.getData('newY');
},
duration : function(target : Phaser.GameObjects.Sprite) {
return target.getData('tweenDuration');
}
},
},
callbackScope : this,
// once the movement is complete, let's see if there are new matches to remove
onComplete : this.removeMatches
});
}
}
dragAndMatch.ts
The class responsible of everything, the one you can use in your projects
interface DragAndMatchConfig {
rows? : number;
columns? : number;
items? : number;
match? : number;
tileSize? : number;
startX? : number;
startY? : number;
minDragDistance? : number;
[otherOptions : string] : unknown;
}
interface GameConfig {
rows : number;
columns : number;
items : number;
match : number;
tileSize : number;
startX : number;
startY : number;
minDragDistance : number;
}
enum directionType {
NONE,
HORIZONTAL,
VERTICAL
}
interface DragAndMatchTile {
empty : boolean;
value : number;
item : DragAndMatchItem;
}
interface DragAndMatchMatch {
startRow : number;
startColumn : number;
endRow : number;
endColumn : number;
direction : directionType;
length : number;
value : number;
}
export class DragAndMatch {
static readonly DEFALUT_VALUES : GameConfig = {
rows : 6,
columns : 8,
items : 6,
match : 3,
tileSize : 100,
startX : 0,
startY : 0,
minDragDistance : 30
}
config : GameConfig;
gameArray : DragAndMatchTile[][];
dragDirection : directionType;
dummyItem : DragAndMatchItem;
itemPool : DragAndMatchItem[];
constructor(options? : DragAndMatchConfig) {
this.config = {
rows : (options === undefined || options.rows === undefined) ? DragAndMatch.DEFALUT_VALUES.rows : options.rows,
columns : (options === undefined || options.columns === undefined) ? DragAndMatch.DEFALUT_VALUES.columns : options.columns,
items : (options === undefined || options.items === undefined) ? DragAndMatch.DEFALUT_VALUES.items : options.items,
match : (options === undefined || options.match === undefined) ? DragAndMatch.DEFALUT_VALUES.match : options.match,
tileSize : (options === undefined || options.tileSize === undefined) ? DragAndMatch.DEFALUT_VALUES.tileSize : options.tileSize,
startX : (options === undefined || options.startX === undefined) ? DragAndMatch.DEFALUT_VALUES.startX : options.startX,
startY : (options === undefined || options.startY === undefined) ? DragAndMatch.DEFALUT_VALUES.startY : options.startY,
minDragDistance : (options === undefined || options.minDragDistance === undefined) ? DragAndMatch.DEFALUT_VALUES.minDragDistance : options.minDragDistance,
}
this.dragDirection = directionType.NONE;
this.gameArray = [];
for (let i : number = 0; i < this.config.rows; i ++) {
this.gameArray[i] = [];
for (let j : number = 0; j < this.config.columns; j ++) {
let randomValue : number = this.safeValue(i, j);
this.gameArray[i][j] = {
empty : false,
value : randomValue,
item : new DragAndMatchItem(i, j, randomValue, this.config.startX + j * this.config.tileSize, this.config.startY + i * this.config.tileSize, false)
}
}
}
this.dummyItem = new DragAndMatchItem(0, 0, 0, 0, 0, true);
}
/* get all game items */
get items() : DragAndMatchItem[] {
let items : DragAndMatchItem[] = [];
for (let i : number = 0; i < this.config.rows; i ++) {
for (let j : number = 0; j < this.config.columns; j ++) {
items.push(this.gameArray[i][j].item);
}
}
items.push(this.dummyItem);
return items;
}
/* remove the matches */
removeMatches() : DragAndMatchItem[] {
this.itemPool = [];
let items : DragAndMatchItem[] = [];
let matches : DragAndMatchMatch[] = this.matches;
matches.forEach((match) => {
switch (match.direction) {
case directionType.VERTICAL :
for (let i : number = match.startRow; i <= match.endRow; i ++) {
if (!this.gameArray[i][match.startColumn].empty) {
this.gameArray[i][match.startColumn].empty = true;
items.push(this.gameArray[i][match.startColumn].item);
this.itemPool.push(this.gameArray[i][match.startColumn].item);
}
}
break;
case directionType.HORIZONTAL :
for (let i : number = match.startColumn; i <= match.endColumn; i ++) {
if (!this.gameArray[match.startRow][i].empty) {
this.gameArray[match.startRow][i].empty = true;
items.push(this.gameArray[match.startRow][i].item);
this.itemPool.push(this.gameArray[match.startRow][i].item);
}
}
break;
}
});
return items;
}
/* arrange the board after a match */
arrangeBoard() : DragAndMatchItem[] {
let result : DragAndMatchItem[] = [];
for (let i = this.config.rows - 2; i >= 0; i --) {
for (let j = 0; j < this.config.columns; j ++) {
let emptySpaces = this.emptySpacesBelow(i, j);
if (!this.gameArray[i][j].empty && emptySpaces > 0) {
let item : DragAndMatchItem = this.gameArray[i][j].item;
item.row += emptySpaces;
let movement : DragAndMatchMovement = new DragAndMatchMovement(item.posX, item.posY, item.posX, item.posY + emptySpaces * this.config.tileSize, emptySpaces);
item.posY += emptySpaces * this.config.tileSize;
item.movement = movement;
result.push(item);
let tempTile : DragAndMatchTile = this.gameArray[i + emptySpaces][j];
this.gameArray[i + emptySpaces][j] = this.gameArray[i][j];
this.gameArray[i][j] = tempTile;
}
}
}
for (let i : number = 0; i < this.config.columns; i ++) {
if (this.gameArray[0][i].empty) {
let emptySpaces : number = this.emptySpacesBelow(0, i) + 1;
for (let j : number = emptySpaces - 1; j >=0; j --) {
let randomValue : number = Math.floor(Math.random() * this.config.items);
let item : DragAndMatchItem = this.itemPool.shift() as DragAndMatchItem;
item.value = randomValue;
item.row = j;
item.column = i;
let movement : DragAndMatchMovement = new DragAndMatchMovement(this.config.startX + i * this.config.tileSize, this.config.startY - (emptySpaces - j) * this.config.tileSize, this.config.startX + i * this.config.tileSize, this.config.startY + j * this.config.tileSize, emptySpaces);
item.posY = this.config.startY + j * this.config.tileSize;
item.posX = this.config.startX + i * this.config.tileSize;
item.movement = movement;
result.push(item);
this.gameArray[j][i].item = item;
this.gameArray[j][i].value = randomValue;
this.gameArray[j][i].empty = false;
}
}
}
return result;
}
/* output board values in console */
logValues() : void {
let output : string = '';
for (let i : number = 0; i < this.config.rows; i ++) {
for (let j : number = 0; j < this.config.columns; j ++) {
output += (this.gameArray[i][j].empty ? '.' : this.gameArray[i][j].value) + ' ';
}
output += '\n';
}
console.log(output);
}
/* check if input is inside game board */
isInputInsideBoard(x : number, y : number) : boolean {
let column : number = Math.floor((x - this.config.startX) / this.config.tileSize);
let row : number = Math.floor((y - this.config.startY) / this.config.tileSize);
return this.validPick(row, column);
}
/* handle input movement */
handleInputMovement(startX : number, startY : number, currentX : number, currentY : number) : DragAndMatchItem[] {
let distanceX : number = currentX - startX;
if (Math.abs(distanceX % this.config.tileSize) == 0) {
distanceX += 0.001;
}
let distanceY : number = currentY - startY;
if (Math.abs(distanceY % this.config.tileSize) == 0) {
distanceY += 0.001;
}
if (this.dragDirection == directionType.NONE && Math.abs(distanceX) + Math.abs(distanceY) > this.config.minDragDistance) {
this.dragDirection = (Math.abs(distanceX) > Math.abs(distanceY)) ? directionType.HORIZONTAL : directionType.VERTICAL;
}
let items : DragAndMatchItem[] = [];
switch (this.dragDirection) {
case directionType.HORIZONTAL :
let row : number = Math.floor((startY - this.config.startY) / this.config.tileSize);
items = this.getItemsAtRow(row);
items.forEach((item) => {
let newPosX : number = item.column * this.config.tileSize + distanceX;
let limitX : number = this.config.columns * this.config.tileSize;
newPosX = newPosX >= 0 ? newPosX % limitX : (newPosX % limitX + limitX) % limitX;
item.posX = this.config.startX + newPosX;
});
this.dummyItem.posY = this.config.startY + row * this.config.tileSize;
this.dummyItem.posX = distanceX >= 0 ? (this.config.startX + Math.abs(distanceX) % this.config.tileSize - this.config.tileSize) : (this.config.startX - Math.abs(distanceX) % this.config.tileSize);
let columnOffset : number = Math.floor(distanceX / this.config.tileSize);
let newColumnReference : number = columnOffset >= 0 ? (this.config.columns - 1 - columnOffset % this.config.columns) : (((1 + columnOffset) * -1) % this.config.columns);
this.dummyItem.value = this.gameArray[row][newColumnReference].value;
items.push(this.dummyItem);
break;
case directionType.VERTICAL :
let column : number = Math.floor((startX - this.config.startX) / this.config.tileSize);
items = this.getItemsAtColumn(column);
items.forEach((item) => {
let newPosY : number = item.row * this.config.tileSize + distanceY;
let limitY : number = this.config.rows * this.config.tileSize;
newPosY = newPosY >= 0 ? newPosY % limitY : (newPosY % limitY + limitY) % limitY;
item.posY = this.config.startY + newPosY;
});
this.dummyItem.posX = this.config.startX + column * this.config.tileSize;
this.dummyItem.posY = distanceY >= 0 ? (this.config.startY + Math.abs(distanceY) % this.config.tileSize - this.config.tileSize) : (this.config.startY - Math.abs(distanceY) % this.config.tileSize);
let rowOffset : number = Math.floor(distanceY / this.config.tileSize);
let newRowReference : number = rowOffset >= 0 ? (this.config.rows - 1 - rowOffset % this.config.rows) : (((1 + rowOffset) * -1) % this.config.rows);
this.dummyItem.value = this.gameArray[newRowReference][column].value;
items.push(this.dummyItem);
break;
}
return items;
}
/* handle stop input movement */
handleInputStop(startX : number, startY : number, currentX : number, currentY : number) : DragAndMatchItem[] {
let items: DragAndMatchItem[] = [];
let tempItemArray : DragAndMatchItem[];
let tempValueArray : number[];
switch (this.dragDirection) {
case directionType.HORIZONTAL :
let row : number = Math.floor((startY - this.config.startY) / this.config.tileSize);
let distanceX : number = currentX - startX;
let columnOffset : number = Math.round(distanceX / this.config.tileSize);
tempItemArray = this.getItemsAtRow(row);
tempValueArray = this.getValuesAtRow(row);
for (let i : number = 0; i < this.config.columns; i ++) {
let destinationColumn : number = i - columnOffset;
let wrappedDestinationColumn : number = this.wrapValues(destinationColumn, this.config.columns);
let item : DragAndMatchItem = tempItemArray[wrappedDestinationColumn];
item.column = i;
item.posX = this.config.startX + i * this.config.tileSize;
this.gameArray[row][i].item = item;
this.gameArray[row][i].value = tempValueArray[wrappedDestinationColumn];
}
items = this.getItemsAtRow(row);
break;
case directionType.VERTICAL :
let column : number = Math.floor((startX - this.config.startX) / this.config.tileSize);
let distanceY : number = currentY - startY;
let rowOffset : number = Math.round(distanceY / this.config.tileSize);
tempItemArray = this.getItemsAtColumn(column);
tempValueArray = this.getValuesAtColumn(column);
for (let i : number = 0; i < this.config.rows; i ++) {
let destinationRow : number = i - rowOffset;
let wrappedDestinationRow : number = this.wrapValues(destinationRow, this.config.rows);
let item : DragAndMatchItem = tempItemArray[wrappedDestinationRow];
item.row = i;
item.posY = this.config.startY + i * this.config.tileSize;
this.gameArray[i][column].item = item;
this.gameArray[i][column].value = tempValueArray[wrappedDestinationRow];
}
items = this.getItemsAtColumn(column);
break;
}
items.push(this.dummyItem);
this.dragDirection = directionType.NONE;
return items;
}
/* get all matches */
get matches() : DragAndMatchMatch[] {
let matches : DragAndMatchMatch[] = [];
for (let i : number = 0; i < this.config.rows; i ++) {
matches = matches.concat(this.getHorizontalMatches(i));
}
for (let i : number = 0; i < this.config.columns; i ++) {
matches = matches.concat(this.getVerticalMatches(i));
}
return matches;
}
/* are there matches? */
get thereAreMatches() : boolean {
return this.matches.length > 0;
}
/* get all matches in a row */
private getHorizontalMatches(row : number) : DragAndMatchMatch[] {
let matches : DragAndMatchMatch[] = [];
let combo : number = 1;
let currentValue : number = this.gameArray[row][0].value;
let comboStart : number = 0;
for (let i : number = 1; i < this.config.columns; i ++) {
let value : number = this.gameArray[row][i].value;
if (value == currentValue) {
combo ++;
}
if (value != currentValue || i == this.config.columns - 1) {
if (combo >= this.config.match) {
matches.push({
startRow : row,
startColumn : comboStart,
endRow : row,
endColumn : comboStart + combo - 1,
direction : directionType.HORIZONTAL,
length : combo,
value : currentValue
});
}
combo = 1;
comboStart = i;
currentValue = value;
}
}
return matches;
}
/* just a function to wap values */
private wrapValues(value : number, limit : number) : number {
return value >= 0 ? value % limit : (value % limit + limit) % limit;
}
/* get all items in a row */
private getItemsAtRow(row : number) : DragAndMatchItem[] {
let items : DragAndMatchItem[] = [];
for (let i : number = 0; i < this.config.columns; i ++) {
items.push(this.gameArray[row][i].item as DragAndMatchItem);
}
return items;
}
/* get all values in a row */
private getValuesAtRow(row : number) : number[] {
let values : number[] = [];
for (let i : number = 0; i < this.config.columns; i ++) {
values.push(this.gameArray[row][i].value);
}
return values;
}
/* get all items in a column */
private getItemsAtColumn(column : number) : DragAndMatchItem[] {
let items : DragAndMatchItem[] = [];
for (let i : number = 0; i < this.config.rows; i ++) {
items.push(this.gameArray[i][column].item as DragAndMatchItem);
}
return items;
}
/* get all values in a column */
private getValuesAtColumn(column : number) : number[] {
let values : number[] = [];
for (let i : number = 0; i < this.config.rows; i ++) {
values.push(this.gameArray[i][column].value);
}
return values;
}
/* check a pick is in a valid row and column */
private validPick(row : number, column : number) : boolean {
return row >= 0 && row < this.config.rows && column >= 0 && column < this.config.columns && this.gameArray[row] != undefined && this.gameArray[row][column] != undefined;
}
/* get all matches in a column */
private getVerticalMatches(column : number) : DragAndMatchMatch[] {
let matches : DragAndMatchMatch[] = [];
let combo : number = 1;
let currentValue : number = this.gameArray[0][column].value;
let comboStart : number = 0;
for (let i : number = 1; i < this.config.rows; i ++) {
let value : number = this.gameArray[i][column].value;
if (value == currentValue) {
combo ++;
}
if (value != currentValue || i == this.config.rows - 1) {
if (combo >= this.config.match) {
matches.push({
startRow : comboStart,
startColumn : column,
endRow : comboStart + combo - 1,
endColumn : column,
direction : directionType.VERTICAL,
length : combo,
value : currentValue
})
}
combo = 1;
comboStart = i;
currentValue = value;
}
}
return matches;
}
/* calculate how many empty spaces there are below (row, column) */
private emptySpacesBelow(row : number, column : number) : number {
let result : number = 0;
if (row != this.config.rows) {
for (let i : number = row + 1; i < this.config.rows; i ++) {
if (this.gameArray[i][column].empty) {
result ++;
}
}
}
return result;
}
/* generate a safe value, which can't return a match in the game */
private safeValue(row : number, column : number) : number {
let safeValues : number[] = Array.from(Array(this.config.items).keys());
if (row >= this.config.match - 1) {
let possibleMatch : boolean = true;
let prevValue : number = -1;
let value : number = -1;
for (let i : number = row - 1; i > row - this.config.match; i --) {
value = this.gameArray[i][column].value;
possibleMatch = possibleMatch && (value == prevValue || prevValue == -1);
prevValue = value;
}
if (possibleMatch) {
let index = safeValues.indexOf(value);
if (index > -1) {
safeValues.splice(index, 1);
}
}
}
if (column >= this.config.match - 1) {
let possibleMatch : boolean = true;
let prevValue : number = -1;
let value : number = -1;
for (let i : number = column - 1; i > column - this.config.match; i --) {
value = this.gameArray[row][i].value;
possibleMatch = possibleMatch && (value == prevValue || prevValue == -1);
prevValue = value;
}
if (possibleMatch) {
let index = safeValues.indexOf(value);
if (index > -1) {
safeValues.splice(index, 1);
}
}
}
return safeValues[Math.floor(Math.random() * safeValues.length)]
}
}
class DragAndMatchItem {
row : number;
column : number;
value : number;
data : any;
posX : number;
posY : number;
isDummy : boolean;
movement : DragAndMatchMovement;
constructor(row : number, column : number, value: number, posX: number, posY: number, isDummy : boolean) {
this.row = row;
this.column = column;
this.value = value;
this.posX = posX;
this.posY = posY;
this.isDummy = isDummy;
}
}
class DragAndMatchMovement {
startX : number;
startY : number;
endX : number;
endY : number;
deltaRow : number;
constructor(startX: number, startY : number, endX : number, endY : number, deltaRow : number) {
this.startX = startX;
this.startY = startY;
this.endX = endX;
this.endY = endY;
this.deltaRow = deltaRow;
}
}
And now you can finally have your Drag and Match game running in just a few lines. Now, I am working on a little hyper casual game which will show you how easy is to build Drag and Match games with this class. Download the source code of the entire project.
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