Jigsaw Puzzle Game in HTML5

Download JigsawPuzzleGameIn-Html5.zip (773.2 KB)

 

Introduction

HTML5 is getting famous day by day. Some fantastic and amazing games have been building using HTML5. So I thought to create Jigsaw game using HTML 5. It is very famous game to arrange a blocks to complete image. I used HTML5 canvas which is very handy and efficient way to render image.

Create Image Blocks

For saving information of each block, create imageBlock class, which will contain the information of each block. For drawing the image block in the canvas, we will simply get block information from array and draw it accordingly.

 function imageBlock(no, x, y) {

    this.no = no;
    this.x = x;
    this.y = y;
    this.isSelected = false;
 }
    

For breaking image into the parts, we need to push each imageBlock into the array and set the random x and y coordinates for each block. We also prepare final destination array having coordinates for each block. This array helps us to get information on drop of the image block and also checking how many image blocks has right position.

 function SetImageBlock() {

    var total = TOTAL_PIECES;
    imageBlockList = new Array();
    blockList = new Array();

    var x1 = BLOCK_IMG_WIDTH + 20;
    var x2 = canvas.width - 50;
    var y2 = BLOCK_IMG_HEIGHT;

    for (var i = 0; i < total; i++) {

        var randomX = randomXtoY(x1, x2, 2);
        var randomY = randomXtoY(0, y2, 2);
       
        var imgBlock = new imageBlock(i, randomX, randomY);

        imageBlockList.push(imgBlock);

        var x = (i % TOTAL_COLUMNS) * BLOCK_WIDTH;
        var y = Math.floor(i / TOTAL_COLUMNS) * BLOCK_HEIGHT;

        var block = new imageBlock(i, x, y);
        blockList.push(block);

    }

 }
    

Get all image Blocks information from array and if block is not selected then simply draw it.

 function drawAllImages() {

    for (var i = 0; i < imageBlockList.length; i++) {
        var imgBlock = imageBlockList[i];
        if (imgBlock.isSelected == false) {

            drawImageBlock(imgBlock);
        }
    }
 }
    

Use drawImage method of the canvas for drawing block. Calculate source x and y coordinates based on block number and pass them to the ctx.drawImage(...) method to draw image block. This method read image based on provided information and draw it into canvas on given destination coordinates.

 function drawImageBlock(imgBlock) {
         
    drawFinalImage(imgBlock.no, imgBlock.x, imgBlock.y, BLOCK_WIDTH, BLOCK_HEIGHT);
 
 }

 function drawFinalImage(index, destX, destY, destWidth, destHeight) {

    ctx.save();

    var srcX = (index % TOTAL_COLUMNS) * IMG_WIDTH;
    var srcY = Math.floor(index / TOTAL_COLUMNS) * IMG_HEIGHT;

    ctx.drawImage(image1, srcX, srcY, IMG_WIDTH, IMG_HEIGHT, destX, destY, destWidth, destHeight);

    ctx.restore();
 }

Drag Image Block

For drag image block, register mouse down, up and move event of canvas.

 // register events
 canvas.onmousedown = handleOnMouseDown;
 canvas.onmouseup = handleOnMouseUp;
 canvas.onmouseout = handleOnMouseOut;
 canvas.onmousemove = handleOnMouseMove;

On mouse down simple find imageBlock in the collection lay between click positions of mouse. If item found then assign it to the selectedBlock object.

 function handleOnMouseDown(e) {

    // remove old selected
    if (selectedBlock != null) {

        imageBlockList[selectedBlock.no].isSelected = false;

    }

    selectedBlock = GetImageBlock(imageBlockList, e.pageX, e.pageY);

    if (selectedBlock) {
        imageBlockList[selectedBlock.no].isSelected = true;
    }

 }

On mouse move if it has selectedBlock then set new x and y position of the selected block and redraw the canvas.

 function handleOnMouseMove(e) {

    if (selectedBlock) {

        selectedBlock.x = e.pageX  - 25;
        selectedBlock.y = e.pageY  - 25;

        DrawGame();
    }
 }

On mouse up check if it is on the block and block does not has image then set source image coordinates accordingly and redraw the canvas. If game is finished with this move then make it finish.

 function handleOnMouseUp(e) {

    if (selectedBlock) {
        var index = selectedBlock.no;
     
        var block = GetImageBlock(blockList, e.pageX, e.pageY);
        if (block) {

            var blockOldImage = GetImageBlockOnEqual(imageBlockList, block.x, block.y);
            if (blockOldImage == null) {
                imageBlockList[index].x = block.x;
                imageBlockList[index].y = block.y;
            }
        }
        else {
            imageBlockList[index].x = selectedBlock.x;
            imageBlockList[index].y = selectedBlock.y;
        }

        imageBlockList[index].isSelected = false;
        selectedBlock = null;
        DrawGame();

        if (isFinished()) {
            OnFinished();
        }
    }
 }

Play Audio on Finish

On the finish of the game for playing music simply creates audio object using javaScript and set its source and play it.

 function OnFinished() {

    var audioElement = document.createElement('audio');
    audioElement.setAttribute('src', 'Audio/finish.mp3');
    audioElement.play();

    .
    .
    .
 }