tesseract.js/main_dev.js

function builddemo(id, val){
    var demo = document.getElementById(id)
    var prog = demo.querySelector('.prog')
    var out = demo.querySelector('.out')

    var disp = demo.querySelector('.display')
    var dctx = disp.getContext('2d')
    disp.width = 0
    disp.height = 0

    demo.querySelector('.runbutton').onclick = function(){
        setrunning(0)
        run(editor)
    }

    function show_progress(p){

        setrunning(0)
        console.log(p)
        if(p.loaded_lang_model) prog.value = p.loaded_lang_model
        if(p.recognized) prog.value = p.recognized
        out.innerText = JSON.stringify(p)
        out.innerText = JSON.stringify(p)

    }

    function setrunning(v){
        if (v == 1) {
            demo.querySelector('.running').style.display = 'none'
            demo.querySelector('.notrunning').style.display = 'block'
            // out.style.visibility = 'hidden'
        }
        else {
            demo.querySelector('.running').style.display = 'block'
            demo.querySelector('.notrunning').style.display = 'none'
        }
    }

    function display(result) {

        React.render(React.createElement(Node, { node: result, expanded: true, label: "output_of_above_demo_plz_click_stuff"}), document.getElementById("explorer"));

        setrunning(1)

        out.innerText = "Lightning Speeeeeeed"
        prog.value = 0

        console.log(result)

        disp.width = demo.querySelector('.to_ocr').naturalWidth
        disp.height = demo.querySelector('.to_ocr').naturalHeight

        disp.style.width = demo.querySelector('.to_ocr').offsetWidth
        disp.style.height = demo.querySelector('.to_ocr').offsetHeight


        dctx.shadowColor = "rgba(255,255,255,.1)"
        dctx.shadowOffsetX = 0;
        dctx.shadowOffsetY = 0;
        dctx.shadowBlur = 10;

        dctx.fillRect(0,0,disp.width, disp.height)

        var m  = result.words.map(function(w){
            
            var b = w.bbox
            dctx.font = '20px Times'
            var font = 20*(b.x1-b.x0)/dctx.measureText(w.text).width+"px Times"

            
            var k = function(){
                dctx.font = font
                dctx.fillText(w.text, b.x0, w.baseline.y0);
                return font
            }

            return k
        })

        var times = 0
        var maxtimes = m.length + 100
        function draw(i){

            times++
            // dctx.fillStyle="rgba(30, 29, 49, .8)"
            dctx.fillStyle="rgba(0, 219, 157, "+Math.min(i/100,1)+")"
            // dctx.globalAlpha = .1;
            dctx.clearRect(0,0,disp.width, disp.height)
            dctx.fillRect(0,0,disp.width, disp.height)

            for (var j = 0; j < Math.min(i,m.length); j++) {
                var asdf = Math.min(Math.max(i - j,0), 100)
                dctx.fillStyle = "rgba(255,255,255,"+asdf*.01+")"
                m[j]()
            };

            if(i<maxtimes){
                setTimeout(function(){
                    draw(i+1)
                },10)                   
            }
            else{
                console.log('done')
            }
        }
        draw(0)
        result.words.forEach(function(word, index){
            var wdiv = document.createElement('div')
            wdiv.innerText = word.text+' '
            wdiv.style['font-family'] = "Times"
            wdiv.style.position = 'absolute'
            var to_ocr = document.querySelector('.to_ocr')
            var scale = to_ocr.offsetHeight / to_ocr.naturalHeight
            wdiv.style['font-size'] = parseFloat(m[index]().split('px')[0]) * scale
            wdiv.style.color = "rgba(0,0,0,0)"
            wdiv.style.top = word.bbox.y0 * scale
            wdiv.style.left = word.bbox.x0 * scale
            wdiv.style.height = (word.bbox.y1 - word.bbox.y0)*scale
            wdiv.style.width = (word.bbox.x1 - word.bbox.x0)*scale
            document.querySelector('.ocroutput').appendChild(wdiv)
        })
    }

    window.addEventListener('resize', function() {
        disp.style.width = demo.querySelector('.to_ocr').offsetWidth
        disp.style.height = demo.querySelector('.to_ocr').offsetHeight
    })

    function run(c){
        eval(c.getValue())
    }

    var editor = CodeMirror(demo.querySelector('.editor'),{
        // lineNumbers: true,
        viewportMargin: Infinity,
        value: val
    });

    var sc = demo.querySelector('.demoheader')
    var scdiv = document.createElement('div')
    sc.appendChild(scdiv)
    scdiv.className = 'CodeMirror cm-s-default'
    // scdiv.className = 'cm-s-default'
    CodeMirror.runMode('<script src="http://localhost:1234/master/lib/Tesseract_dev.js"></script>', {
        name: 'xml',
        htmlMode: true
    }, scdiv)

    // var scripttag = CodeMirror(,{
    //  mode: {name: 'xml', htmlMode: true},
    //  readOnly: 'nocursor',
    //  value: 
    // });
    editor.clear = function(){
        dctx.clearRect(0,0,disp.width, disp.height)
        document.querySelector('.ocroutput').innerHTML = ''

    }

    editor.img = demo.querySelector('.to_ocr')

    editor.run = function(){

        if (editor.img.complete) {
            run(editor)
        } else{
            editor.img.onload = function(){
                run(editor)
            }
        }
    }

    return editor
}

setTimeout(function(){
    document.getElementById('wow').className += ' opaque'
}, 100) 

var wow = builddemo('wow', 
"var img = demo.querySelector('img.to_ocr')\n\n\
Tesseract\n\
  .recognize( img, {\n\
    progress: show_progress} )\n\
  .then( display ) // scroll down for full output ")

wow.run()


var tabs = Array.prototype.slice.call(document.querySelectorAll('.langlabel'))
var ltabs = Array.prototype.slice.call(document.querySelectorAll('.ltab'))
var langs = ['eng', 'chi_sim', 'rus', 'meme']

function setlang(i){
    tabs.forEach(function(t){
        t.className = 'langlabel'
    })
    tabs[i].className = 'langlabel selected'
    console.log(tabs[i])
    wow.setValue( 
         "var img = demo.querySelector('img.to_ocr')\n\n" 
        +"Tesseract\n" 
        +"  .recognize( img, {\n"
        +"    progress: show_progress, lang: '"+langs[i]+"'} )\n" 
        +"  .then( display ) // scroll down for full output ")
    wow.img.src = 'img/'+langs[i]+'.png'
    wow.clear()

}


ltabs.forEach(function(ltab,i){
    ltab.onclick = function(){
        setlang(i)
    }
})


tabs.forEach(function(tab,i){
    tab.onclick = function(){
       setlang(i)
    }
})
// document.querySelector('.getStarted')[0].onclick = function(){
//  location.href = '#'
//  location.href = '#get_started'
// }

// builddemo('demo2',
// "var img = demo.querySelector('img.to_ocr')\n\n\
// Tesseract\n\
//   .recognize( img, {progress: show_progress, lang:'chi_sim'} )\n\
//   .then( display )")