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I'm making a game in html5/js, there is a map with a fog of war on it. When you right click on the canvas you can save the canvas as an image and so, you can have the whole map in a jpg, but that map need to be hidden.
Is there any trick to disable this ?
I tried to create my fog of war in the same canvas than the map, it works but it's harder to move the fog since i need to create for every move the entire map.
Thank you.
372
Here’s how to moderately obfuscate your image:
It works by scrambling your map so the casual user cannot easily view it.
Obfuscating Demo: http://jsfiddle.net/m1erickson/wWbt5/
When you need the image, unscramble it into an in-memory canvas that the user can’t see, but which you can programatically use in your game.
De-obfuscating Demo: http://jsfiddle.net/m1erickson/UtN6g/
Code for obfuscating
<!doctype html>
<html>
<head>
<link rel="stylesheet" type="text/css" media="all" href="css/reset.css" /> <!-- reset css -->
<script type="text/javascript" src="http://code.jquery.com/jquery.min.js"></script>
<style>
body{ background-color: ivory; padding:20px;}
#obfuscated{border:1px solid blue;}
#canvas{border:1px solid red;}
</style>
<script>
$(function(){
var img=new Image();
img.onload=start;
img.crossOrigin="anonymous";
img.src="https://dl.dropboxusercontent.com/u/139992952/stackoverflow/obfuscated.png";
var verticalSlices=60;
var horizontalSlices=60;
var sliceCount=verticalSlices*horizontalSlices;
var sliceWidth,sliceHeight;
var slices=[];
var json;
function start(){
// vars for slice sizes
sliceWidth=img.width/verticalSlices;
sliceHeight=img.height/horizontalSlices;
// create a slices array to be used to scramble our image
for(var i=0;i<sliceCount;i++){ slices.push(i); }
slices=shuffle(slices);
// scramble the original image
var $obfuscatedImage=document.getElementById("obfuscated");
$obfuscatedImage.src=obfuscate(img,slices);
// create a JSON array used to descramble the image
slices.unshift(verticalSlices,horizontalSlices);
json=JSON.stringify(slices);
}
function obfuscate(img,slices){
var tempCanvas=document.createElement("canvas");
var tempCtx=tempCanvas.getContext('2d');
tempCanvas.width=img.width;
tempCanvas.height=img.height;
for(var i=0;i<slices.length;i++){
var s=slices[i];
var row=parseInt(s/verticalSlices);
var col=s-row*verticalSlices;
var x=col*sliceWidth;
var y=row*sliceHeight;
var canvasRow=parseInt(i/verticalSlices);
var canvasCol=i-canvasRow*verticalSlices;
var canvasX=canvasCol*sliceWidth;
var canvasY=canvasRow*sliceHeight;
tempCtx.drawImage(img,
x,y,sliceWidth,sliceHeight,
canvasX,canvasY,sliceWidth,sliceHeight);
}
return(tempCanvas.toDataURL());
}
function shuffle(array) {
var currentIndex = array.length,temporaryValue,randomIndex;
while (0 !== currentIndex) {
randomIndex = Math.floor(Math.random() * currentIndex);
currentIndex -= 1;
temporaryValue = array[currentIndex];
array[currentIndex] = array[randomIndex];
array[randomIndex] = temporaryValue;
}
return array;
}
}); // end $(function(){});
</script>
</head>
<body>
<p>Before scrambling</p>
<img src="https://dl.dropboxusercontent.com/u/139992952/stackoverflow/koolaidman.png"><br>
<p>After scrambling</p>
<img id="obfuscated" width=300 height=300>
</body>
</html>
Code for de-obfuscating
<!doctype html>
<html>
<head>
<link rel="stylesheet" type="text/css" media="all" href="css/reset.css" /> <!-- reset css -->
<script type="text/javascript" src="http://code.jquery.com/jquery.min.js"></script>
<style>
body{ background-color: ivory; padding:20px; }
#obfuscated{border:1px solid red;}
#clarify{margin:10px;}
canvas{border:1px solid blue;}
p{margin:10px;}
</style>
<script>
$(function(){
// this json would be downloaded from the server
// first 2 elements are images width,height
// next 2 elements are #vertical,#horizontal slices
var 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540,3173,2424,3212,1340,2732,2640,2329,2718,912,548,2289,2769,2225,3593,3562,2242,641,3251,1774,1507,3561,557,2600,1335,3452,999,2200,1307,722,2385,3573,512,1347,1880,465,3340,1324,480,3397,1947,1489,939,2229,2132,2472,2615,3030,2378,617,1537,2460,2970,484,2227,908,3509,256,3171,2620,1160,2493,2127,315,2428,731,3122,1318,127,3456,3111,242,1191,1095,2751,1899,781,3514,1800,3413,2868,556,2897,1453,3500,1167,2547,2686,2158,417,3100,2124,3126,2057,3067,3095,1544,1634,3589,2963,3475,1456,2341,3247,3244,193,1176,1034,2571,3077,174,2355,1793,1161,3230,1156,2043,3161,1232,2931,3282,1213,119,2858,2479,2971,1093,57,1720,1756,482,2599,2852,337,3278,93,2731,1278,1618,1379,1679,848,497,1327,1166,2402,3245,1235,1637,1331,3118,3301,3390,2009,3519,1152,1838,1563,3449,3478,1183,3349,2961,1341,3467,2448,1439,3277,3352,2888,397,486,2662,2144,1518,751,2604,2690,714,299,3246,172,2172,1945,2302,3545,2778,27,1633,2866,2567,2854,1315,3159,741,1867,118,442,120,2749,2918,3012,2989,352,1124,145,1322,660,618,1225,31,1281,876,943,3341,1949,1001,861,1103,2836,1846,2184,2613,3437,2492,1533,1754,3191,110,3324,2849,2490,3291,3093,3287,2756,3139,1044,1224,2708,2478,1194,1388,3039,3438,364,609,3234,3279,3290,3553,1482,3436,1851,228,3020,2237,1539,2840,1303,1403,2588,1956,2617,3285,1391,2768,2177,1121,1250,971,3001,2083,1958,1402,1837,2831,2910,1473,3394,1826,1487,1237,245,1273,2207,822,49,953,782,399,552,1119,3085,1321,1892,428,1222,1467,2427,2597,1842,3027,3103,1588,1209,3065,2630,3116,1147,783,3087,3584,2160,237,390,3357,1259,2833,1792,1576,3485,2804,2435,538,1948,136,1098,2468,501,1012,3131,3376,168,853,1660,2972,529,202,1629,2376,3284,711,420,3069,866,3,3265,2315,1662,602,1898,2203,438,2031,3259,3386,3539,2192,1558,1433,1438,1173,2683,1074,1375,1122,351,2382,2665,329,2032,16,1575,2674,3591,3298,616,1129,944,2791,1814,555,717,2825,346,545,2023,2618,3057,2287,875,1316,2168,1897,3062,647,1111,392,83,1667,3401,1484,1062,1666,1700,880,2321,1079,3481,2635,1862,3205,2173,89,2387,2072,248,1131,1048,3424,1169,584,2357,3492,2393,3000,3585,3091,836,833,1276,7,966,190,1125,2404,123,2317,1816,369,3314,2805,2137,927,2399,2071,1954,661,1600,1928,3183,1277,2633,2592,1729,1251,2340,1876,628,401,1612,2624,2969,561,872,1661,752,1593,2324,2161,595,693,3273,1463,1180,1579,1529,2186,2726,3271,720,750,2851,933,3023,2601,2982,1411,2288,1933,2692,1941,700,3015,2345,2947,1264,121,141,2556,2120,719,2409,2440,577,448,603,1246,1485,3169,3016,1577,2359,207,1016,2078,2916,2038,291,1513,70,2301,705,1797,2886,2024,2394,1457,2654,2934,2456,2197,3125,2351,646,2865,2039,2658,2373,3090,799,3097,2166,1936,114,3577,678,3572,1767,2553,2923,2827,2500,621,2979,2454,2847,585,2980,937,769,3249,3569,2925,1287,784,2789,893,1096,2367,2102,1407,2086,809,3184,881,2167,330,1971,1778,3359,3346,2275,954,3530,645,2748,1613,1940,1903,2801,2333,910,1367,1953,2187,3123,2299,2414,2214,936,2152,3200,3358,1583,3101,1301,2463,1977,1718,3580,1813,2381,965,3034,877,2055,1603,2709,1416,3576,226,1535,2619,922,1384,3422,2436,3155,1528,1658,3297,1768,3196,1437,78,790,1026,2248,1853,3426,1434,747,2477,3305,2533,2295,3453,2675,1421,1011,2325,1311,3272,1611,2297,1552,1689,461,449,2736,956,2857,3469,3006,787,657,92,3172,3342,527,217,1297,2596,2992,1910,850,15,1,2314,2520,2892,2088,3380,2213,3330,9,287,3276,3326,310,400,1284,1404,178,2819,749,1082,1922,3493,3463,1271,2848,1483,863,2061,3497,942,985,2631,574,1794,1086,204,2331,244,1212,1475,422,573,3441,104,566,634,97,1135,2390,205,1323,3188,1955,423,41,1436,2366,981,273,666,171,3306,1509,3362,2570,1359,2103,1983,2334,2832,845,2006,1522,2712,1866,3209,2703,1332,52,1412,873,1339,1075,1045,22,3147,3058,2266,1815,150,3124,378,3597,1334,191,322,1719,1179,2286,321,258,1090,1454,2891,2627,1181,1203,314,1531,1749,474,1462,311,2130,1877,39,3109,1744,2074,3221,3307,2450,2841,1976,2007,2884,3482,2073,1007,2485,684,2487,185,1638,1690,80,1652,175,2466,2407,1650,957,2081,2720,2612,451,1875,3225,3598,478,948,1937,490,824,868,358,1962,2968,2981,2154,1362,3133,466,2121,945,1994,2779,2557,2611,325,2725,3435,2915,2370,1915,2138,3202,1267,1819,1443,2058,1077,2181,2304,1773,1071,2374,1288,627,2591,715,111,3594,3168,3007,2555,3003,476,1785,1895,260,336,2439,709,766,1210,772,916,671,1675,467,3143,3137,2182,1227,1452,2348,2053,1394,587,1257,1554,101,3329,1376,1609,2641,2911,1357,1441,398,1479,1038,3063,2201,2080,2609,2420,2719,2360,3544,182,2668,925,2,327,271,1258,2224,2937,1480,2559,2437,3484,3132,1178,998,3369,3242,2494,266,96,2772,2252,3049,1219,34,1709,2877,3461,3022,1110,2855,1171,960,403,1964,890,1905,2777,1623,2395,3043,137,1930,3051,2069,3348,2338,1677,1648,3211,1742,1294,1556,746,415,1772,3502,1113,3498,2054,994,3400,1762,1734,441,3236,1076,2430,58,50,1506,1673,36,1469,1559,2117,3073,2452,156,1828,3465,3053,3566,2639,1500,344,1262,1428,1254,1157,1557,1163,1870,3547,431,493,1882,1694,2241,3522,2701,3194,1776,2311,2518,2084,539,1349,3045,452,1298,2389,2626,663,742,2689,955,1831,23,979,1836,642,1581,3323,509,716,429,1426,496,1589,1888,591,3540,348,157,1333,764,802,1963,2476,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var keys=JSON.parse(json);
$button=document.getElementById("clarify");
$button.style.display="none";
var img=new Image();
img.onload=function(){
$button.style.display="block";
}
img.src="https://dl.dropboxusercontent.com/u/139992952/stackoverflow/obfuscated.png";
function deobfuscate(obfuscatedImage,keys){
var tempCanvas=document.createElement("canvas");
var tempCtx=tempCanvas.getContext('2d');
tempCanvas.width=obfuscatedImage.width;
tempCanvas.height=obfuscatedImage.height;
var verticalSlices=keys.shift();
var horizontalSlices=keys.shift();
var sliceWidth=tempCanvas.width/verticalSlices;
var sliceHeight=tempCanvas.height/horizontalSlices;
for(var i=0;i<keys.length;i++){
var s=keys[i];
var row=parseInt(s/verticalSlices);
var col=s-row*verticalSlices;
var x=col*sliceWidth;
var y=row*sliceHeight;
var canvasRow=parseInt(i/verticalSlices);
var canvasCol=i-canvasRow*verticalSlices;
var canvasX=canvasCol*sliceWidth;
var canvasY=canvasRow*sliceHeight;
tempCtx.drawImage(obfuscatedImage,
canvasX,canvasY,sliceWidth,sliceHeight,
x,y,sliceWidth,sliceHeight);
}
return(tempCanvas);
}
$("#clarify").click(function(){
var canvas=deobfuscate(img,keys);
document.body.appendChild(canvas);
});
}); // end $(function(){});
</script>
</head>
<body>
<button id="clarify">De-obfuscate</button>
<p>The obfuscated image</p>
<img id="obfuscated" src="https://dl.dropboxusercontent.com/u/139992952/stackoverflow/obfuscated.png">
<p>The de-obfuscated canvas</p><br>
</body>
</html>
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