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Share example code for making faces using HTML5 Canvas

零下一度

May 04, 2017 pm 03:26 PM

Here we mainly use the Canvas of HTML5 for drawing. Example code for making faces using html5.

Let’s first look at the face rendering we want to draw:

用 HTML5 绘制人脸

Here we mainly use HTML5 Canvas for drawing.

Let’s start the entire drawing process:

1. HTML (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>
        <p class="container">
            <canvas id="scene" width="500" height="500"></canvas>

            <p 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" />
            </p>

        </p>
    </body>
</html>

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2. 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 = &#39;center&#39;;
    ctx.fillStyle = &#39;#000&#39;;

    ctx.font = &#39;30px Verdana&#39;;
    if (iSel == 0)
        ctx.font = &#39;bold 30px Verdana&#39;;
    ctx.fillText(&#39;< Head >&#39;, 400, 80);

    ctx.font = &#39;30px Verdana&#39;;
    if (iSel == 1)
        ctx.font = &#39;bold 30px Verdana&#39;;
    ctx.fillText(&#39;< Eye >&#39;, 400, 180);

    ctx.font = &#39;30px Verdana&#39;;
    if (iSel == 2)
        ctx.font = &#39;bold 30px Verdana&#39;;
    ctx.fillText(&#39;< Nose >&#39;, 400, 280);

    ctx.font = &#39;30px Verdana&#39;;
    if (iSel == 3)
        ctx.font = &#39;bold 30px Verdana&#39;;
    ctx.fillText(&#39;< Mouth >&#39;, 400, 380);
}

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

// initialization
$(function(){
    canvas = document.getElementById(&#39;scene&#39;);
    ctx = canvas.getContext(&#39;2d&#39;);

    // initialization of dragon
    var oHeadImage = new Image();
    oHeadImage.src = &#39;images/image.png&#39;;
    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(&#39;canvas&#39;);
                temp_ctx = temp_canvas.getContext(&#39;2d&#39;);
                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();
                $(&#39;#face_result&#39;).attr(&#39;src&#39;, vData);
                break;
        }
    }); 

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

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【Related Recommended】

1. Free h5 online video tutorial

2. HTML5 full version manual

3. php.cn original html5 video tutorial

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