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I was born in 1981 in one little city. Since I was 10y/o I programmed in different languages. My first languages were basic, then C++/MFC, after .Net (C#, VB.Net, J#, ASP.Net), XSL+XML processing). In the last 5 years I worked with web languages (HTML, CSS, PHP, SQL, XML, XSL, JavaScript). After university I worked in several different companies, eventually becoming a blogger. This is my hobby too. Andrey is a DZone MVB and is not an employee of DZone and has posted 111 posts at DZone. You can read more from them at their website. View Full User Profile

HTML5 Face Builder

12.12.2011
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HTML5 Face Builder


This is another interesting application of HTML5. Today I have developed a little ‘toy’. This little toy can be enhanced into something big. Welcome to test new HTML5 tool – Face Builder (canvas). This tool will allow your members (visitors) to compose their faces, you can select through predefined elements (face, eyes, nose, mouth), and in end – you can ‘export’ result into image (like crop tool).

Here are our demo and downloadable package:

Live Demo

download in package

Ok, download the source files and lets start coding !

Step 1. HTML

Small code with canvas element and blank image (for future exported image)

index.html
<!DOCTYPE html>
<html lang="en" >
    <head>
        <meta charset="utf-8" />
        <title>HTML5 Face Builder | Script Tutorials</title>

        <link href="css/main.css" rel="stylesheet" type="text/css" />
        <script src="http://code.jquery.com/jquery-latest.min.js"></script>
        <script type="text/javascript" src="js/script.js"></script>
    </head>
    <body>
        <header>
            <h2>HTML5 image crop tool</h2>
            <a href="http://www.script-tutorials.com/html5-face-builder/" class="stuts">Back to original tutorial on <span>Script Tutorials</span></a>
        </header>
        <div class="container">
            <canvas id="scene" width="500" height="500"></canvas>
            <div id="results">
                <h2>Use arrow keys to select your face details (up-down to select category, left-right to switch them), then click Spacebar to export as image.</h2>
                <img id="face_result" />
            </div>
        </div>
    </body>
</html>

Step 2. HTML5 JS

js/script.js
// inner variables
var canvas, ctx;
var oHead, oEye, oNose, oMouth;
var iSel = 0;
// -------------------------------------------------------------

// objects :
function Head(x, y, x2, y2, w, h, image) {
    this.x = x;
    this.y = y;
    this.x2 = x2;
    this.y2 = y2;
    this.w = w;
    this.h = h;
    this.image = image;
    this.iSpr = 0;
}
function Eye(x, y, x2, y2, w, h, image) {
    this.x = x;
    this.y = y;
    this.x2 = x2;
    this.y2 = y2;
    this.w = w;
    this.h = h;
    this.image = image;
    this.iSpr = 0;
}
function Nose(x, y, x2, y2, w, h, image) {
    this.x = x;
    this.y = y;
    this.x2 = x2;
    this.y2 = y2;
    this.w = w;
    this.h = h;
    this.image = image;
    this.iSpr = 0;
}
function Mouth(x, y, x2, y2, w, h, image) {
    this.x = x;
    this.y = y;
    this.x2 = x2;
    this.y2 = y2;
    this.w = w;
    this.h = h;
    this.image = image;
    this.iSpr = 0;
}
// -------------------------------------------------------------

// draw functions :
function clear() { // clear canvas function
    ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
}

function drawScene() { // main drawScene function
    clear(); // clear canvas

    // draw head
    ctx.drawImage(oHead.image, oHead.x2 + oHead.iSpr*oHead.w, oHead.y2, oHead.w, oHead.h, oHead.x, oHead.y, oHead.w, oHead.h);

    // draw eyes
    ctx.drawImage(oEye.image, oEye.x2 + oEye.iSpr*oEye.w, oEye.y2, oEye.w, oEye.h, oEye.x, oEye.y, oEye.w, oEye.h);

    // draw nose
    ctx.drawImage(oNose.image, oNose.x2 + oNose.iSpr*oNose.w, oNose.y2, oNose.w, oNose.h, oNose.x, oNose.y, oNose.w, oNose.h);

    // draw mouth
    ctx.drawImage(oMouth.image, oMouth.x2 + oMouth.iSpr*oMouth.w, oMouth.y2, oMouth.w, oMouth.h, oMouth.x, oMouth.y, oMouth.w, oMouth.h);

    // draw controls
    ctx.textAlign = 'center';
    ctx.fillStyle = '#000';

    ctx.font = '30px Verdana';
    if (iSel == 0)
        ctx.font = 'bold 30px Verdana';
    ctx.fillText('< Head >', 400, 80);

    ctx.font = '30px Verdana';
    if (iSel == 1)
        ctx.font = 'bold 30px Verdana';
    ctx.fillText('< Eye >', 400, 180);

    ctx.font = '30px Verdana';
    if (iSel == 2)
        ctx.font = 'bold 30px Verdana';
    ctx.fillText('< Nose >', 400, 280);

    ctx.font = '30px Verdana';
    if (iSel == 3)
        ctx.font = 'bold 30px Verdana';
    ctx.fillText('< Mouth >', 400, 380);
}

// -------------------------------------------------------------

// initialization
$(function(){
    canvas = document.getElementById('scene');
    ctx = canvas.getContext('2d');

    // initialization of dragon
    var oHeadImage = new Image();
    oHeadImage.src="images/image.png";
    oHeadImage.onload = function() {};

    oHead = new Head(0, 0, 0, 755, 300, 405, oHeadImage);
    oEye = new Eye(40, 70, 0, 120, 235, 80, oHeadImage);
    oNose = new Nose(70, 120, 0, 276, 180, 140, oHeadImage);
    oMouth = new Mouth(60, 260, 0, 546, 170, 120, oHeadImage);

    $(window).keydown(function(event){
        switch (event.keyCode) {
            case 38: // Up key
                iSel--;
                if (iSel < 0) {
                    iSel = 3;
                }
                break;
            case 40: // Up key
                iSel++;
                if (iSel >= 4) {
                    iSel = 0;
                }
                break;
            case 37: // Left key

                // update sprite positions
                if (iSel == 0) {
                    oHead.iSpr--;
                    if (oHead.iSpr < 0) {
                        oHead.iSpr = 3;
                    }
                }
                if (iSel == 1) {
                    oEye.iSpr--;
                    if (oEye.iSpr < 0) {
                        oEye.iSpr = 4;
                    }
                }
                if (iSel == 2) {
                    oNose.iSpr--;
                    if (oNose.iSpr < 0) {
                        oNose.iSpr = 4;
                    }
                }
                if (iSel == 3) {
                    oMouth.iSpr--;
                    if (oMouth.iSpr < 0) {
                        oMouth.iSpr = 4;
                    }
                }
                break;
            case 39: // Right key

                // update sprite positions
                if (iSel == 0) {
                    oHead.iSpr++;
                    if (oHead.iSpr >= 4) {
                        oHead.iSpr = 0;
                    }
                }
                if (iSel == 1) {
                    oEye.iSpr++;
                    if (oEye.iSpr >= 5) {
                        oEye.iSpr = 0;
                    }
                }
                if (iSel == 2) {
                    oNose.iSpr++;
                    if (oNose.iSpr >= 5) {
                        oNose.iSpr = 0;
                    }
                }
                if (iSel == 3) {
                    oMouth.iSpr++;
                    if (oMouth.iSpr >= 5) {
                        oMouth.iSpr = 0;
                    }
                }
                break;

            case 32: // Spacebar key - export results
                var temp_ctx, temp_canvas;
                temp_canvas = document.createElement('canvas');
                temp_ctx = temp_canvas.getContext('2d');
                temp_canvas.width = 360;
                temp_canvas.height = 410;

                // draw head
                temp_ctx.drawImage(oHead.image, oHead.iSpr*oHead.w, oHead.y2, oHead.w, oHead.h, oHead.x, oHead.y, oHead.w, oHead.h);

                // draw eyes
                temp_ctx.drawImage(oEye.image, oEye.iSpr*oEye.w, oEye.y2, oEye.w, oEye.h, oEye.x, oEye.y, oEye.w, oEye.h);

                // draw nose
                temp_ctx.drawImage(oNose.image, oNose.iSpr*oNose.w, oNose.y2, oNose.w, oNose.h, oNose.x, oNose.y, oNose.w, oNose.h);

                // draw mouth
                temp_ctx.drawImage(oMouth.image, oMouth.iSpr*oMouth.w, oMouth.y2, oMouth.w, oMouth.h, oMouth.x, oMouth.y, oMouth.w, oMouth.h);

                var vData = temp_canvas.toDataURL();
                $('#face_result').attr('src', vData);
                break;
        }
    }); 

    setInterval(drawScene, 40); // loop drawScene
});

Most of code is already commented. So I will hope that you will understand all this code. If not – you always can ask me any related questions.

 

Source: http://www.script-tutorials.com/html5-face-builder/

 

 

 

Published at DZone with permission of Andrey Prikaznov, author and DZone MVB.

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