Yuk Belajar Programming

Jumat, 20 September 2013

Window Debug Javascript - IE, Firefox, Chrome

Ada kalanya program html5 kita error, dan tak bisa berjalan sesuai yang kita ingikan.
Untuk itu, kita bisa menampilkan Window Debug Javascript di Browser.
Error di program kita pun bisa di deteksi.

Ini shortcut nya:
1. Chrome : Ctrl + Shift + J
2. Firefox : Ctrl + Shift + J
3. IE : F12

semoga bermanfaat :)

sumber:
http://stackoverflow.com/questions/9464545/debugging-firefox-extension-from-add-on-builder
http://stackoverflow.com/questions/66420/how-do-you-launch-the-javascript-debugger-in-google-chrome
https://developers.google.com/chrome-developer-tools/docs/javascript-debugging
http://stackoverflow.com/questions/10191099/debugging-javascript-in-ie

Kamis, 19 September 2013

resize_canvas - setelah di modifikasi untuk Firefox

function resize_canvas(){
var t = getViewport();

innerWidth = t[0];//window.innerWidth;
innerHeight = t[1];//window.innerHeight;

sizeDiffW = innerWidth-canvasWidth;
sizeDiffH = innerHeight-canvasHeight;
chkscaleW = innerWidth/canvasWidth;
chkscaleH = innerHeight/canvasHeight;
scaleFix = Math.min(chkscaleW,chkscaleH);

canvas.width=canvasWidth*scaleFix;
canvas.height=canvasHeight*scaleFix;
context.scale(scaleFix, scaleFix);

canvas.style.left="100px";
canvas.style.top="100px";
canvas.style.marginLeft="100px";
canvas.style.marginTop="100px";

canvas.style.left=((innerWidth-canvasWidth*scaleFix)/2)+"px";
canvas.style.top=((innerHeight-canvasHeight*scaleFix)/2)+"px";

canvas.style.marginLeft=""+((innerWidth-canvasWidth*scaleFix)/2)+"px";
canvas.style.marginTop=""+((innerHeight-canvasHeight*scaleFix)/2)+"px";

}

getViewport - window.style.left - di Firefox

HTML5 - error di firefox

Kemarin ada error di html5 yang saya buat, ketika dijalankan dengan Firefox.

akhirnya googling deh ...
ketemu: http://www.lynnnayko.com/2012/06/declaration-of-character-encoding-in.html

Ini dia Error nya:
Error: The character encoding of the HTML document was not declared. The document will render with garbled text in some browser configurations if the document contains characters from outside the US-ASCII range. The character encoding of the page must be declared in the document or in the transfer protocol.

Nah begini caranya supaya menghilangkan error tersebut:

Letakkan :
<meta http-equiv="Content-Type" content="text/html" charset="utf-8" />

di <head>
seperti ini:

!DOCTYPE HTML>
<html>
<head>
<title>Animasi PNG Sequence</title>

<meta http-equiv="Content-Type" content="text/html" charset="utf-8" />
<style>
body {
margin: 0px;
padding: 0px;
}

</style>
.........
</html>

Rabu, 18 September 2013

resize_canvas html5

Selasa, 17 September 2013

Menjalankan animasi png sequence dengan html5

Menjalankan animasi png sequence dengan html5
Png sequence adalah urutan file png dengan index, yang sudah dipersiapkan sebelumnya.

Ini dia programnya :

<!DOCTYPE HTML>
<html>
<head>
<style>
body {
margin: 0px;
padding: 0px;
}
</style>
</head>
<body>
<canvas id="myCanvas" width="480" height="800"></canvas>
<script>
window.requestAnimFrame = (function(callback) {
return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame ||
function(callback) {
window.setTimeout(callback, 1000 / 60);
};
})();
var iframe = 1;
var maxframe = 10;
var ArrImage = new Array();
for(var i=1;i<=10;i++){
if(i<10) ArrImage[i] = 'images/images000'+i+'.png';
else if(i<100) ArrImage[i] = 'images/images00'+i+'.png';
}

var imageObj = new Image();
var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');

function animate() {

// update

// clear
//context.clearRect(0, 0, canvas.width, canvas.height);

// draw stuff
imageObj.onload = function() {
context.drawImage(imageObj, 0, 0);
};
imageObj.src = ArrImage[Math.floor(iframe)];

if(iframe<maxframe) iframe+=0.1;
else iframe=maxframe;

// request new frame
requestAnimFrame(function() {
animate();
});
}

animate();

</script>
</body>
</html>

mohon koreksi jika ada kekeliruan di program saya
maklum, masih belajar :)

semoga bermanfaat

sumber:
http://www.html5canvastutorials.com/tutorials/html5-canvas-image-loader/

Senin, 16 September 2013

get timer di javascript

t0 = new Date().getTime();
ts = new Date().getTime() - t0;

ts adalah renggang waktu;

sumber:
http://www.w3schools.com/jsref/jsref_gettime.asp