JavaScript - Background Animation Not Working

Hi,

I have created an animation exercise for an eLearning lesson in a program that uses JavaScript as the scripting for a Windows executable. A retired social worker who creates these eLearning materials as give-away's to help people in the community improve health, it would be a big help to reaching more people if instead of a Windows executable version, the animation could be developed in a web page. A lot more people could view the eLearning and try this exercise which trains people in pacing their breathing.

The animation has a 300X300 circle on the canvas with a couple of text input boxes and a start button. The JS < 50 lines of script, but since it was not developed for a web page, it has no tags and it depends on objects like the circle or button (or 2 audio files to create the inhale/exhale sounds) that were already placed on the canvas in the Windows executable program.

I'm not very skilled using Dreamweaver CS5, but with help, reading, references can try to convert this JS into a web version, if it's possible. Not sure how to do this and would appreciate any help.

I am adding a screenshot of the interface and the JS functions that are called by the start button.



//JS: ( bar1 is the variable entered by the use as breaths per minute-BPM; //time1 is the exercise length; the variables initially are set as follows: //time1=15,
//volume=100)

var time1

function minuteTimer()
{
breakLoop = false
stopLoop = false
fork (calcBreathing)

for (var i=0;i<time1;i++)
{
wait(60)
breakLoop = true
Submit.Show()
Text122.Show()
Text12.Show()
TextInput22.Show()
TextInput2.Show()
Submit2.Hide()
TextInput2.SetTransparency(0,false)
TextInput22.SetTransparency(0,false)
Text12.SetTransparency(0,false)
Text122.SetTransparency(0,false)
Text5.SetTransparency(0,false)
Frame12.SetTransparency(0,false)
Submit.SetTransparency(0,false)
TextInput2.Enable(true)
TextInput22.Enable(true)
Debug.trace("\n minutes elapsed "+(i+1)+"\n")
}
stopLoop = true
}
function calcBreathing()
{
var bar2 = 60/bar1

for (loop = 0;loop<bar1;loop++)
{
mySound.Play(1,volume)
Vector8.Scale(.5,.5, bar2*.3)
mySound.Stop()
wait (bar2*.05)
mySound2.Play(1,volume)
Vector8.Scale(-.5,-.5,bar2*.6)
mySound2.Stop()
wait (bar2*.05)
if (breakLoop) break
}

breakLoop = false
if (bar1 > 6) bar1--
if (!stopLoop) calcBreathing()
}

Any help appreciated. Thanks very much.

Kind Regards,

saratogacoach

I have a picture of a pinwheel on my website that I want to spin onMouseover. Can this be done with JavaScript?

I have created an animation API, which has an option for the 'effect' or animation type. Now i'm trying to produce a slow, fast slow effect using a sine wave but seem to be having some trouble!

The code below is supposed to get the steps to calculate each frame by diving the usable part of the sine wave into the total frames. The code should then go on to calculate insert the relevant values into the frame variables, after which multiply them all so that they are the correct scale so that when the animation is running it simply looks up the value and applies it, no need for any processing.

With an animation from 0 to 740 (px in this case) the function returns: 115, 228, 335, 434, 523, 598, 659, 703, 730, 740

Oh and just a quick addition the variable "end" will equal 740 in the case above, or whatever the end value is.

Code:

	case "SFS":

                var step = 90 / totalFrames;
		var pi = Math.PI;
		var raid = 0;
			
		for (var i = 1; i <= totalFrames; i++){
			raid = (i*step)*(pi/180);	
			queueFrameValue[topOfQueue][i] = Math.sin(raid);
		}
			
		var multiplier = end / queueFrameValue[topOfQueue][totalFrames];
		for (var i = 1; i <= totalFrames; i++){
			queueFrameValue[topOfQueue][i] = queueFrameValue[topOfQueue][i] * multiplier;
		}

              break;

Thanks!

Anyone got any suggestions on techniques? 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? Anyone know of a better way of doing things?

I have a site with a lot of animated gifs and I was wondering if there was a way to (on page load) stop all gif animations (only show first image frame). Then when you click a link, it will animate the animated gifs.

Hi,
I will really appreciate if someone could take a look at my code below and inform me where I'm going wrong, because I can't seem to tell.

The instructions a
-the file starts with the text "Avalon Books" on the left edge of the page.
-the text moves to the center of the page.
-After the text reaches the center, the image file kids.jpg appears
-Every two seconds thereafter, the image file is swapped with the next image file in the stack (there are 3 images in total).

I am only posting the few relevant functions where the problem could be. All the other functions are working properly.

I am new to JavaScript so any help will be really appreciated.
Thank you

This is the main file:
Code:

function placeObjects(){
  var W = (0.5)*winWidth(); //gets the width of user's browser.
  placeIt("avalon",0,0);        //placeIt function is working fine.
  placeIt("kids",W-75,100);
  placeIt("fiction",W-75,100);
  placeIt("nfiction",W-75,100);
  setZ("kids",3);                //setZ function is below.
  setZ("fiction",2);
  setZ("nfiction",1);
  moveAvalon();
}

function moveAvalon(){
  var x = xCoord("avalon");
  if(x <= (W-125)){
    shiftIt("avalon", 10, 0);
    setTimeout("moveAvalon()",50);
  }
  else swapImages();  //if x is greater than W-125
}

function swapImages(){
  showIt("kids");
  showIt("fiction");
  showIt("nfiction");

  setTimeout("swapIt(kids,fiction,nfiction)",2000); //syntax could be wrong here?
}

</script>
</head>

<body onload="placeObjects()"> //calls the first function on load.
...............
</body>
</html>

and here is the second file that contains all the functions (I am posting 2 of those functions):
Code:

function setZ(id, z){
  var object=document.getElementById(id);
  object.style.zIndex="z";
}

function swapIt(id1, id2, id3){
  var object1=getObject(id1);
  var object2=getObject(id2);
  var object3=getObject(id3);
  
  var z1;
  var z2;
  var z3;

  object1.style.zIndex="z1";
  object2.style.zIndex="z2";
  object3.style.zIndex="z3";

  object1.style.zIndex="z3";
  object2.style.zIndex="z1";
  object3.style.zIndex="z2";
}

Hello readers!
I made some animation code
Code:

	for (var i = 1; i < 8; i++) {
		var slc = ".s" + i;
		$(slc).css(
		{
			'position':'absolute',
			'top':'-300px',
			'left':30*i*5,
			'width':'100px',
			'height':'300px',
			'backgroundColor':'white'
		});
	};
	$('body').click(function() {
	for (var t = 1; t < 8; t++) {
	var asd = '.s' + t;
		$(asd).animate({
			'top':'0px'
		}, 100*t).animate({
			'top':'-300px'
		}, 100*t);
	};
	});

in html there are some div tags.
So, question is - How to normilize queue of animation? You see that first box moves fast and the last one moves very slow to the end.
I would like boxes to move proportionally in relation to the time.
Could you give some recommendations about this stuff?

Hi, I created JavaScript animation and the picture after animation finished disappear. Could anyone tell me or point me how to resolve this kind of issue? I tested it in IE as well as Firefox.. I could send the code but it is quite long for posting, but the screenshots from before and after animation is finished are as below.


thanks in advance for any help.
trotsky

I am having some difficulty with this project. It is supposed to be an animation of falling leaves. I am very new to arrays and JavaScript, so right off the bat I know that the arrays I have are not right, or are missing something else in order for it to function. Basically all I have for this project is a still picture of the leaves and that is it. If there is someone out there with some JavaScript expertise, could you tell me what I am doing wrong?
Here is the code so far, I think it is too long.


Code:

<script type="text/javascript">
/* <![CDATA[ */
grphcs=new Array(6)
Image0=new Image();
Image0.src=grphcs[0]="images/leaf1.gif";
Image1=new Image();
Image1.src=grphcs[1]="images/leaf2.gif";
Image2=new Image();
Image2.src=grphcs[2]="images/leaf3.gif";
Image3=new Image();
Image3.src=grphcs[3]="images/leaf4.gif";
Image4=new Image();
Image4.src=grphcs[4]="images/leaf5.gif";
Image5=new Image();
Image5.src=grphcs[5]="images/leaf6.gif";


var minSpeed = 5;
var maxSpeed = 30;
var randomSpeed = 5;
var randomSpeed2 = 10;
var randomSpeed3 = 15;
var randomSpeed4 = 20;
var randomSpeed5 = 25;
var randomSpeed6 = 30;
var minHorizontal = 200;
var maxHorizontal = screen.availWidth - 300;
var leftPosition = Math.floor(Math.random() * (maxHorizontal - 

(minHorizontal + 1)) + minHorizontal);
var leftPosition2 = Math.floor(Math.random() * (maxHorizontal - 

(minHorizontal + 1)) + minHorizontal);
var leftPosition3 = Math.floor(Math.random() * (maxHorizontal - 

minHorizontal +1)) + minHorizontal);
var leftPosition4 = Math.floor(Math.random() * (maxHorizontal - 

minHorizontal + 1)) + minHorizontal);
var leftPosition5 = Math.floor(Math.random() * (maxHorizontal - 

minHorizontal + 1)) + minHorizontal);
var leftPosition6 = Math.floor(Math.random() * (maxHorizontal - 

minHorizontal + 1)) + minHorizontal);
var minVertical = 50;
var maxVertical = screen.availHeight - 300;
var topPosition = Math.floor(Math.random() * (maxVertical - 

(minVertical + 1)) + minVertical);
var topPosition2 = Math.floor(Math.random() * (maxVertical - 

(minVertical + 1)) + minVertical);
var topPosition3 = Math.floor(Math.random() * (maxVertical - 

(minVertical + 1)) + minVertical);
var topPosition4 = Math.floor(Math.random() * (maxVertical - 

(minVertical + 1)) + minVertical);
var topPosition5 = Math.floor(Math.random() * (maxVertical - 

(minVertical + 1)) + minVertical);
var topPosition6 = Math.floor(Math.rnadom() * (maxVertical - 

(minVertical + 1)) + minVertical);

function matchLeaf() {
      if (navigator.appName == "Microsoft Internet Explorer") {
          widthMax = document.documentElement.clientWidth;
          heightMax = document.documentElement.clientHeight;
      }
      else {
           widthMax = window.innerwidth - 14;
           heightMax = window.innerHeight;
      }
      autumnFall();
}

function autumnFall();
      var fallingLeaf1 = document.getElementById("leaf1");
      fallingLeaf1.style.left = leftPosition + "px";
      fallingLeaf1.style.top = topPosition + "px";
      fallingLeaf1.style.visibility = "visible";
      topPosition += parseInt(randomspeed);
      leftPosition += 0;
      if (topPosition >= screen.availHeight - 300) {
      topPosition = Math.floor(Math.random() * (maxVertical - 

(minVertical + 1)) + minVertical);
      leftPosition = Math.floor(Math.random() * (maxHorizontal - 

(minHorizontal + 1)) + minHorizontal);
      leaf1.src = "images/leaf" + Math.floor(Math.random() * 6 + 

".gif";
      randomSpeed = Math.floor(Math.random() * maxSpeed - 

(minSpeed + 1)) + minSpeed);
      }

       var fallingLeaf2 = document.getElementById("leaf2");
       fallingLeaf2.style.left = leftPosition2 + "px";
       fallingLeaf2.style.top = topPosition2 + "px";
       fallingLeaf2.style.visibility = "visible";
       topPosition2 += parseInt(randomSpeed3);
       leftPosition2 += 0;
       if (topPosition2 >= screenavailHeight - 300) {
       topPosition2 = Math.floor(Math.random() * (maxVertical - 

(minVertical + 1)) + minVertical);
       leftPosition2 = Math.floor(Math.random() * (maxHorizontal 

- (minHorizontal + 1)) + minHorizontal);
       leaf2.src = "images/leaf" + Math.floor(Math.random() * 6) 

+ "gif";
       randomSpeed2 = Math.floor(Math.random() * (maxSpeed - 

(minSpeed + 1)) + minSpeed);
       }

       var fallingLeaf3 = document.getElementById("leaf3");
       fallingLeaf3.style.left = leftPosition3 + "px";
       fallingLeaf3.style.top = topPosition3 + "px";
       fallingLeaf3.stye.visibility = "visible";
       topPosition3 += parseInt(randomSpeed3);
       leftPosition3 += 0;
       if (topPosition3 >= screen.availHeight - 300) {
       topPosition3 = Math.floor(Math.random() * (maxVertical - 

(minVertical + 1)) + minVertical);
       leftPosition3 = Math.floor(Math.random() * (maxHorizontal 

- (minHorizontal + 1)) + minHorizontal);
       leaf3.src = "images/leaf" + Math.floor(Math.random() * 6 

+ "gif";
       randomSpeed3 = Math.floor(Math.random() * (maxSpeed - 

(minSpeed + 1)) + minSpeed);
       }

       var fallingLeaf4 = document.getElementById("leaf4");
       fallingLeaf4.style.left = leftPosition4 + "px";
       fallingLeaf4.style.top = topPosition4 + "px";
       fallingLeaf4.style.visibility = "visible";
       topPosition4 += parseInt(randomSpeed4);
       leftPosition4 += 0;
       if (topPosition4 >= screen.availHeight - 300) {
       topPosition4 = Math.floor(Math.random() * (maxVertical - 

(minVertical + 1)) + minVertical);
       leftPosition4 = Math.floor(Math.random() * (maxHorizontal 

- (minHorizontal + 1)) + minHorizontal);
       leaf4.src = "images/leaf" + Math.floor(Math.random() * 6 

+ "gif";
       randomSpeed4 = Math.floor(Math.random() * (maxSpeed - 

(minSpeed + 1)) + minSpeed);
       }

       var fallingLeaf5 = document.getElementById("leaf5");
       fallingLeaf5.style.left = leftPosition5 + "px";
       fallingLeaf5.style.top = topPosition5 + "px";
       fallingLeaf5.style.visibility = "visible";
       topPosition5= parseInt(randomSpeed5);
       leftPosition5 += 0;
       if (topPosition5 >= screen.availHeight - 300) {
       topPosition5 = Math.floor(Math.random() * (maxVertical - 

(minVertical + 1)) + minVertical);
       leftPosition5 = Math.floor(Math.random() * (maxHorizontal 

- (minHorizontal + 1)) + minHorizontal);
       leaf5.src = "images/leaf + Math.floor(Math.random() * 6 + 

"gif";
       randomSpeed5 = Math.floor(Math.random() * (maxSpeed - 

(minSpeed + 1)) + minSpeed);
       }

       var fallingLeaf6 = document.getElementById("leaf6");
       fallingLeaf6.style.left = leftPosition6 + "px";
       fallingLeaf6.style.top = topPosition6 + "px";
       fallingLeaf6.style.visibility = "visible";
       topPosition6 = parseInt(randomSpeed6);
       leftPosition6 += 0;
       if (topPosition6 >= screen.availHeight - 300) {
       topPosition6 = Math.floor(Math.random() * (maxVertical - 

(minVertical + 1)) + minVertical);
       leftPosition6 = Math.floor(Math.random() * (maxHorizontal 

- (minHorizontal + 1)) + minHorizontal);
       leaf6.src = "images/leaf + Math.floor(Math.random() * 6 + 

"gif";
       randomSpeed6 = Math.floor(math.random() * (maxSpeed - 

(minSpeed + 1)) + minSpeed);
       }
}
/* ]]> */
</script>
</head>

<body onload="setInterval('matchLeaf()', 100);">

     <img id="leaf1" src="images/leaf1.gif" alt="leafone" 

style="position:absolute; left:100px; top:100px;" />
     <img id="leaf2" src="images/leaf2.gif" alt="leaftwo" 

style="position:absolute; left:100px; top:100px;" />
     <img id ="leaf3" src="images/leaf3.gif" alt="leafthree" 

style="position:absolute; left:100px; top:100px;" />
     <img id="leaf4" src="images/leaf4.gif" alt="leaffour" 

style="position:absolute; left:100px; top:100px;" />
     <img id="leaf5" src="images/leaf5.gif" alt="leaffive" 

style="position:absolute; left:100px; top:100px;" />
     <img id="leaf6" src="images/leaf6.gif" alt="leafsix" 

style="position:absolute; left:100px; top:100px;" />

I'm attempting to write a function that will cause a small red dot to slide from off-screen, to it's position, 15 px into the page. However every time I run it, it does nothing, and I get a message on Firebug reading "dot 1 is null" on line 4 of the function.

Below is the function:
Code:

function openingAnim() {
	var dot1 = null;

	dot1 = document.getElementById('m-dot1');
	dot1.style.left = '0px';
	doMove();


	function doMove() {
		while (dot1.style.left < 15) {
			setTimeout("dot1.style.left = parseInt(dot1.style.left)+1+'px';",20);
		}
	}
}

And here is the id of the dot graphic from my CSS file:
Code:

#m-dot1 {
	position:absolute;
	background:url(../images/m-dot1.png);
	width:50px;
	height:50px;
	outline:none;
	left:-50px;
	top:89px;
	z-index:15
}

Can anyone tell me what I'm doing wrong?

Hi all,
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:

Code:

var shoreline = new Array();
var waves = new Array();
var canWidth = 600;
var canHeight = 400;
var waveNum = 0;
var count = 0;

function wave() {
	setupShore();
	var canvas = document.getElementById("canvas");
	canvas.setAttribute("width",canWidth);
	canvas.setAttribute("height",canHeight);
	var ctx = canvas.getContext("2d");
	createWave();
	setInterval(update(ctx), 1000);
}
	
function update(ctx) {
	if(waves.length != 0) {
		drawWater(ctx);
		drawShore(ctx);
		drawWaves(ctx);
		updateWaves();	
	}
}

function drawElement(ctx, x, y, width, height, fillcolor) {
	ctx.fillStyle = fillcolor;
	ctx.fillRect(x, y, width, height);
}

function setupShore() {
	for(var i = 0; i <= canWidth/5; i++) {
		shoreline[i] = Math.round(canHeight/5); // + Math.floor(Math.random()*101);
	}
}

function createWave() {
	/*	Wave array setup:
		[ [waveID1, [node1, node2, ..., nodeN]], 
		[waveID2, [node1, node2, ..., nodeN] ] */
	waves.push([waveNum, []]);
	for(var c = 0; c <= canWidth/5; c++){
		waves[waves.length-1][1].push(canHeight);
	}
	waveNum = waveNum + 1;
}

function destroyWave() {
	waves.shift();
}

function drawWater(ctx) {
	drawElement(ctx, 0, 0, canWidth, canHeight, "#336699");
}

function drawShore(ctx) {
	for(var s = 0; s <= shoreline.length; s++) {
		drawElement(ctx, s*5, 0, 5, shoreline[s], "#FFCC00");
	}
}

function updateWaves() {
	for(var u = 0; u < waves.length; u++) {
		var limit = waves[u][1].length;
		for(var v = 0; v < limit; v++){
			var temp = waves[u][1][v]-5;
			waves[u][1][v] = temp;
			if(waves[u][1][v] <= shoreline[v]){
				destroyWave();
			}
		}
	}
}

function drawWaves(ctx) {
	for(var w = 0; w < waves.length; w++) {
		for(var n = 0; n <= waves[w][1].length; n++){
			y = waves[w][1][n];
			drawElement(ctx, n*5, y, 5, 5, "Purple");
		}
	}
}

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.

Any idea why this is happening? 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.

Once I've got this animating properly I can continue my project, but I've hit a roadblock. Thanks in advance for your help, I'm really stuck.

Marcus

Hi everyone!
I'm new to coding and need help on my school project. I have to animate a ball and make it move up and down the page using the if statement and the or logic.

I understand the concepts of the if statement but when it comes to actually writing it in code, I fail miserably at it.

Heres the code...
Code:

<html>
<body>
<center><button type="button"onClick="first()">Click to move ball down!</button>
<button type="button"onclick="second()">Click to return ball to top!</button></center>
<IMG ID="ball"STYLE="position:absolute;left:50;top:50;width:100;height:100;"SRC="ball.jpg">
<script language="JavaScript">
var myElement=document.getElementById("ball");
var loc= 50;
function first()
	{
		loc +=50;
		myElement.style.top=loc;
	}
setInterval("first()",50);	

function move()
	{
		if(loc>500 || loc<0)
		{
			loc=-loc;
		}
		myBall.style.top=loc;
	}
</script>
</body>
</html>

..
so what is happening is the ball will continuously fall without stopping.

Can someone help me get the ball bounce from the edge of the screen back to the top and continue to do it.

Thanks.

How can I make a image where the first image "rolls" up and another (different) image "rolls" up from the bottom? I know how to code it except for the animation sequence. All images are 200 width and 50 height.\

Thanks in advance!

(Would like to use jQuery if possible)

Hi, can someone look at my code and tell me why the animated GIF doesn't display? It is a rollover button and it's done in javascript. The mouseover file is profileani.gif. The image displays but it doesn't do the animation. The site is http://www.creationindex.com/indextest22.html If you just move the mouse around on the screen you'll see the rollover. Thank you.

I have just completed my JS studies and wish to try 3 things to test what I have learned, first I wish to create a simple animation, then I'll attempt my own slideshow and last a specific script. First, can I try the animation on this specific forum? If not then is there another forum for this on this board or do I have to go to an animation specific site please?