Using Translate To Move Canvas Around (Animation)
Jul 12, 2011
The main one I find is to use translate to move the canvas around, which just seems odd to me. I don't even fully understand how it works. But the one I was looking at used clearRect. In examples given looked as though it had to redraw the canvas every frame. I'm just mucking around with a simple poker game, figured I'd have the table in one layer and anything that moves on a top layer? By doing that I could only clear each card as it moved around...yes?
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May 6, 2010
I'm new to Javascript, and having an issue with getInterval. For my programming languages class we have to create a simulation of waves breaking on a shore from above. I've decided to use a canvas object and Javascript for this animation, but am getting stuck on refreshing the frames.
Here is the code I have so far:
var shoreline = new Array();
var waves = new Array();
var canWidth = 600;
var canHeight = 400;
var waveNum = 0;
var count = 0; .....
As you can see, the idea is that each 5-pixel wide node of the shore and wave are stored in arrays so that the position of each node can differ. The wave() function initializes all the required data, and then calls setInterval on update(). The function update() draws the water, shore, and wave, and then updates the wave position node-by-node. Ideally, setInterval would cause this to happen repeatedly, so that the wave would appear to move closer to the shore every 1000ms.
However, this is not the case. It appears as though setInterval is working for one pass of update(), but fails after the first pass. You can tell that this is happening because the wave appears at its starting position, but does not continue to move. I read somewhere that setInterval can be broken by one-time functions, but I'm not sure. If you'd like to see what it's currently doing in a browser, I've hosted it here [URL]. Once I've got this animating properly I can continue my project, but I've hit a roadblock.
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May 18, 2010
My application is based on client-server architecture. It is a E-Learning Application. I am using ruby on rails server, javascript,canvas,SVG element. I have an idea of an interface to allow the teacher to build any type of animation for students using Cake javascript API. I wanted to save the animation build using the canvas element on the rails server either in database or as a file. Later I have to use that animation to be played to students. Any way to do it on any language except proprietary languages like flash but from that language communication can be done with rails server.
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Aug 30, 2011
I have a script that runs a sprite animation on the canvas, adapted from here: [URL] After wondering why it wouldn't work on Safari or older versions of Firefox, I saw this: [URL] and implemented the suggested shim. However, I'm still getting some errors that I can't explain for the life of me. To make this easy for everyone, I threw it in a jsfiddle: [URL]
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Mar 9, 2011
My question explains everything, I have a div inside a parent div. I need to move it inside another div and on the UI show the animation of it moving.
The only way I can think of is, select the element, copy the html(), copy the offset() position and remove element from original container. then add a copy of previously removed element to page/document set the position to the copied offset and animate()
After animation is complete, remove it from the page and add it to the secondary container.
Is there any better and easier way of doing this ? any plugin may be ?
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Mar 30, 2010
This is meant to be a very simple animation. Everything seems to be correct, but it doesn't seem to run. Basically it is a system where the image is 50px taller than the box it is being displayed in. When you hover over the image, the image is meant to move up via jquery to show the bottom (previously hidden) 50px and cut off the top 50px.
Here is my Site: [URL]
Here is my HTML:
Code:
<div id="container"><div>
<a class="none" href="<?php the_permalink() ?>"><img src="/themes/smo/portfolio/<?php echo get_post_meta($post->ID, 'portfolio_img',true).".gif"; ?>" alt="" /></a>
</div></div>
Here is the Jquery:
Code:
$(function(){
$("div.container div a").hover(function(){
$("img", this).stop().animate({top:"-51px"},{queue:false,duration:200});
}, function() {
$("img", this).stop().animate({top:"0px"},{queue:false,duration:200});
});
I think its something to do with the container class.
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Jul 12, 2011
I want to delete some lines on the canvas that i have created in HTML5 (with the <canvas> tag). I know one solution and that is using clearRect() (give this function the HEIGHT and WIDTH of the canvas and you clears the whole canvas.).But i don't want to clear the whole canvas, i only want to delete a few lines made by the function lineTo().
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Mar 16, 2009
I have a menu in which is applied typeface script. Typeface 0.11 version doesn't support hover on links. There is an experimental version but doesn't work very well for me, so i tried to implement hover by myself.
Problem is: hover works pretty well changing canvas context property fillColor and then calling fill(), but the stroke on hovered voice remains on another color. Difficult to explain, so i put some test code online: TEST CODE As you can see, passing with mouse on the menu voices triggers the hover and the element change, but remains bordered in red.
[Code]...
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Jul 23, 2005
I need to translate the messages of mine scripts, as I can make
professionally this working with the pair php and javascript?
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Oct 31, 2010
I have 2 functions in asp that I need translated to javascript
the first checks that there is no email in the textbox. the second checks that there is no phone number code...
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Mar 19, 2009
After i setup a module for the Google Translate for my site:[url], I found [url]
then i change the code little bit:
First it was :
Then I made it as:
But still i've 1 error:[url]
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May 25, 2009
Write a function translate() that will translate a text into "r�varspr�ket". That is, double every consonant and place an occurrence of "o" in between.
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May 18, 2011
I need to translate this php code in javascript if possible:
<?php
function ShakeIt($string)
{[code].....
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Apr 14, 2009
function snippet that would take a date like 14-04-2009 and translate it into a Julian date? This is what I have so far, but it doesn't give the correct result:
[Code]....
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Feb 17, 2011
I am trying to create an Image menu for a site I'm working on that is rather simple in essence. When the user hovers over a button I have the menu will move left or right depending. I have not got a great deal into it yet as I have become stuck, as I'm new I figured it would be easier to troubleshoot if I build up the program bit by bit.
[Code]...
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Jun 25, 2009
I have alot of home videos I want to put on my website, and it seems that the easiest way to do it would be to embed it onto my website using HTML script. Problem is, I have no clue how to convert in into HTML scrip
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Jan 10, 2012
I have a button which is animated with a rollover effect, obtained through jQuery of course. I wish to open a lightbox clicking that button and I tried with a simple, self-made lightbox and with FancyBox but in either case the lightbox is displayed without animation.I post the code for my buttons and the lightboxHTML for buttons:
<ul> <li><div id="fader0"> <div class="from"><a class="products" href="#inline"><img src="images/tabproducts.png" alt="Our products" /></a></div> <div class="to"><a class="products" href="#inline"><img src="images/tabproductsHover.png" alt="Our products"
[code]....
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Aug 27, 2011
I've been messing with this code to make a fade in animation with setTimout. The only thing is addition isn't working on the fade in. A subtraction on a negative works though. This seems strange to me.
changeit.style.opacity -= -0.01; works but when it's changed to changeit.style.opacity += 0.01; there's no fade in. It's the only thing I change. My intuition says to me it should work with addition, but maybe there's something I'm not understanding.
<html>
changeit.style.opacity -= -0.01; if this is set to changeit.style.opacity += 0.01; it doesn't work. What?
Of course this is all just for Firefox for now. If I put this in something useful I'll change it so it'll work in other browsers later.
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Dec 2, 2010
How do you translate this to JQUERY?
window.onerror = ftnJavascriptErrorNotification;
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Jun 22, 2006
I am trying to catch keypresses in my canvas tag, but it appears that
that is not valid.
I may try to just create a hidden input box that will allow me to catch
keypresses.
I am trying to write a very simple asteroids game for a presentation on
Ajax in July, to show that javascript can do more than it was able to a
couple of years ago.
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Aug 16, 2010
I am working with the new canvas element. I have simplified my request.
Can I add a class to the canvas JS? Currently the fill colour is set with 'context.fillStyle="red";' I would love have this in a class as I want to change the colour of the fill with jQuery.
<!DOCTYPE html><html><head><meta charset=utf-8"><title>Canvas</title></head><body>
<canvas id="myCanvas"></canvas>
<script type="text/javascript">
var canvas=document.getElementById('myCanvas');
[Code]....
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Feb 23, 2010
Why doesn�t the following code work in IE, I use excanvas.js as told in other articles? excanvas is in the same dir as the html-file.
Code:
<html>
<head>
<title></title>[code].....
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Nov 3, 2011
Why won't my canvas graphics get rendered?
[Code]...
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Feb 13, 2011
I'm writing a script that graphs data in different colors and shapes and I'm encountering two problems:(1) I can't specify different colors for the graph I'm rendering. If I use fillStyle="red"; then the entire chart becomes red. It seems to use the last color specified as the color for everything on the chart.(2) The shapes are overlapping in strange ways. The fills are not covering the lines of shapes behind them so it's unclear which shape is in front and which is behind. It's like they aren't being treated as separate shapes but instead one shape where boundaries are unclear. I don't know how else to explain it.
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Jan 1, 2011
I have make a javascript program that uses HTML canvas and I can't get it to work in Internet Explorer. I tried using excanvas and jqcanvas but had trouble getting them to work.
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Apr 7, 2009
Before the canvas tag you had to write a script to make a gradient for html element backgrounds. Now you can use canvas and it's as easy as ... well messing with canvas. I have this script. At one point I had the gradient img objects resizing so the gradient would not get skewed. it was simple. just set the height% at the opposite ratio of the canvas width/height. But I went to make some changes and the next thing i knew that no longer worked. I don't remember how I did it!! I'm going to have to start over if I can't figure it out. Here's the script. Canvas only.
I haven't adapted with excanvas for IE yet, but that's coming when I can figure out how I had the thing working right. It's a css issue. I had thought I put the img objects in divs that were sized and positioned and then set the images to width 100% height= 100%*((canvas.width-canvas.height)/canvas.width) So in my example, the canvas was 100 x 30 and the factor is 7 so it would resize the image 700% and the height would grow by the relative amount to the setting I had it. I'll try to figure it out, but there's the script working somewhat. I want to figure out a way to resize the img objects when the user resizes the page, but I want the img to always maintain aspect ratio. [URL]
<script>
/*ORIGINAL SCRIPT FOUND AT [URL]*/
window.onload = function () {
var canvas = document.getElementById('c');
var ctx = canvas.getContext('2d');
var g = ctx.createLinearGradient(0, 0, 100, 50);
g.addColorStop(0, 'rgba(255, 255, 0, 0.5)');
g.addColorStop(0.5, '#0ff');
g.addColorStop(1, '#00f');
ctx.fillStyle = g;
ctx.fillRect(0, 0, 100, 50);
var data = canvas.toDataURL();
document.getElementById('i').src = data;
document.getElementById('EIMG').src = data;
var canvas2 = document.getElementById('c2');
var ctx2 = canvas2.getContext('2d');
var g2 = ctx2.createLinearGradient(0, 0, 100, 50);
g2.addColorStop(0, 'rgba(255, 0, 255, 0.5)');
g2.addColorStop(0.5, '#0ff');
g2.addColorStop(1, '#00f');
ctx2.fillStyle = g2;
ctx2.fillRect(0, 0, 100, 50);
var data2 = canvas2.toDataURL();
document.getElementById('i2').src = data2;
document.getElementById('DIMG').src = data2; .....
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