source: other-projects/nz-flag-design/trunk/similarity-2d/flag-processing.js@ 29625

var progressVal = 0;


function drawImage(imageObj, canvasId) {
    "use strict";
    var imgCanvas = document.getElementById(canvasId),
        context, imageData, data,
        imageX = 0, imageY = 0,
        imageWidth = imageObj.width,
        imageHeight = imageObj.height;
    context = imgCanvas.getContext('2d');
    context.drawImage(imageObj, imageX, imageY, imageWidth, imageHeight);
    imageData = context.getImageData(imageX, imageY, imageWidth, imageHeight);
    //data = imageData.data;
    return imageData;
}


function displayFlags(img_list,$displayDiv,$progressArea,$progressBar)
{
    var img_list_len = img_list.length;
    var show_progress = 5;

    if (img_list_len==0) {
    return;
    }
    else if (img_list_len>show_progress) {
    $progressArea.slideDown();
    }

    var root_img_re = /^.*\/(.*?)\..*?$/;

    var progress_step = 100.0 / img_list_len;
    
    var callback_count = 0;
    
    var i;
    for (i=0; i<img_list.length; i++) {
    var img_url     = img_list[i];
    var img_matches = root_img_re.exec(img_url);
    var title       = img_matches[1];
    
    var imageObj = new Image();
    imageObj.onload = function () {
        callback_count++;
        progressVal += progress_step;   
        $progressBar.progressbar('value',progressVal);
        
        //image1Data = drawImage(this, "canvas1");
        
        if (callback_count == img_list_len) {
        if (img_list_len>show_progress) {
            $progressArea.slideUp();
        }
        }
    };
    
    imageObj.src   = img_url;
    imageObj.title = title;
    
    $displayDiv.append(imageObj);
    }
}