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JavaScript - Javascript Mouse Position/circle Collision
so basically I have a div that contains the image of a circle and I need to check if the mouse is touching the circle.
what approach should I take to this? I need to call another function when the mouse leaves the circle (which will be a square speaking physically) I would assume it has to do with radius, but I am not really sure how to do this with a circle shape. thanks a ton! Similar TutorialsHello, I'm making a simple javascript game. There is a square stage with a bouncing ball in it. The user can move a paddle along the bottom of the square using the arrow keys to hit the ball, and make it continue bouncing. If the user's paddle doesn't reach the ball in time, it falls to ground, game over. However, my collision isn't working. The ball falls right through my paddle. What am I doing wrong? Code is he <!DOCTYPE HTML PUBLIC> <html> <head> <title>Bask-A-Bounce!</title> <style> #stage{ position: absolute; top: 100; left: 100; border: 3px solid black; width: 500; height: 500; background-color: #E0FFFF; } #paddle{ position: absolute; top: 470; left: 228; width: 64; height: 16; } #ball{ position: absolute; top: 4; left: 200; width: 16; height: 16; } #score{ position: absolute; top: 486; left: 0; width: 500; height: 14; background-color: rgb(32,128,64); } </style> <script language="JavaScript"> //get info, process data, update screen objects //instance vars var ball; var paddle; var score; //initial speeds var dx = 5; var dy = 5; var currentScore = 0; var timer; //set initial conditions for ball and paddle var paddleLeft = 228; var ballLeft = 300; var ballTop = 4; function init(){ //instantiate HTML object instance vars ball = document.getElementById('ball'); paddle = document.getElementById('paddle'); score = document.getElementById('score'); //register key listener with document object document.onkeydown = keyListener; //start the game loop start(); } function keyListener(e){ if(!e){ //for IE e = window.event; } if(e.keyCode==37 && paddleLeft > 0){ //keyCode 37 is left arrow paddleLeft -= 4; paddle.style.left = paddleLeft + 'px'; } if(e.keyCode==39 && paddleLeft < 436){ //keyCode 39 is right arrow paddleLeft += 4; paddle.style.left = paddleLeft + 'px'; } } function start(){ //game loop detectCollisions(); render(); //end conditions if(ballTop < 470){ //still in play - keep the loop going timer = setTimeout('start()',50); } else{ gameOver(); } } function detectCollisions(){ //just reflect the ball on a collision //a more robust engine could change trajectory of ball based //on where the ball hits the paddle if(collisionX()) dx = dx * -1; if(collisionY()) dy = dy * -1; } function collisionX(){ //check left and right boundaries if(ballLeft < 4 || ballLeft > 462) return true; return false; } function collisionY(){ //check if at top of playing area if(ballTop < 4) return true; //check to see if ball collided with paddle if(ballTop > 470){ if(ballLeft > paddleLeft && ballLeft < paddleLeft + 64) return true; } return false; } function render(){ moveBall(); updateScore(); } function moveBall(){ ballLeft += dx; ballTop += dy; ball.style.left = ballLeft; ball.style.top = ballTop; } function updateScore(){ currentScore += 5; score.innerHTML = 'Sco ' + currentScore; } function difficulty(){ //as the game progresses, increase magnitude of the vertical speed if(currentScore % 1000 == 0){ if(dy > 0) dy += 1; else dy -= 1; } } function gameOver(){ //end the game by clearing the timer, modifying the score label clearTimeout(timer); score.innerHTML += " Game Over"; score.style.backgroundColor = 'rgb(128,0,0)'; } </script> </head> <body onLoad="init()"> <h1>Bask-A-Bounce</h1> <div id="stage"> <div id="paddle"> <img src="paddle1.gif"> </div> <div id="ball"> <img src="ball.gif"> </div> <div id="score"> Sco 0 </div> </div> <embed name="SJT" src="SJT.mp3" loop="false" hidden="true" autostart="true"> </embed> </body> </html> i have a simple collision if statement in the main interval in a javascript game. The problem is, it only sometime works, as in i have to shoot at zombies multiple times for them to disappear, when it should only take 1 bullet. i have arrays for the players bullets x and y values, and 5 zombies x and y values(4 total arrays). The collision code is at the bottom of the main() function. here is the code: Code: var missed = 0;
var score = 0;
var on = 1;
var bulletx = [];
var bullety = [];
var zombiex = [700,600,800,1000,900];
var zombiey = [0,100,300,200,50];
function draw(image, x, y){
var canvas = document.getElementById("game");
var context = canvas.getContext("2d");
var imageObj = new Image();
imageObj.onload = function() {
context.drawImage(imageObj, x, y);
};
imageObj.src = image;
}
document.onkeydown = checkKey;
function checkKey(e) {
if(on === 1){
if(on === 1){
e = e || window.event;
if (e.keyCode == '40') {
down();
}else if (e.keyCode == '38') {
up();
}else if(e.keyCode == '32'){
bullety.push(y+50);
bulletx.push(100);
score = score - 1;
}
}
}
}
var y = 300;
function down(){
y = y+50;
draw("player.png", 0, y);
}
function up(){
y = y-50;
draw("player.png", 0, y);
}
draw("player.png",0,y);
function main(){
draw("background.png",0,0);
draw("player.png",0,y);
for(i = 0; i < 5; i++){
draw("zombie.png",zombiex[i],zombiey[i]);
zombiex[i] = zombiex[i] - 5;
if(zombiex[i] < -100){
zombiex[i] = 600;
zombiey[i] = Math.random()*450
missed = missed+1;
}
}
if(missed === 5){
clearInterval(mainint);
alert("5 zombies passed you, and America has fallen");
alert("sco "+score);
on = 0;
}
for(i = 0; i < bulletx.length; i++){
draw("background.png",0,0);
draw("bullet.png",bulletx[i],bullety[i]);
bulletx[i] = bulletx[i]+30;
if(bulletx[i] > 700){
bulletx.splice(i,1);
bullety.splice(i,1);
}
if(bulletx[i] > zombiex[i] && bullety[i] > zombiey[i]-20 && bullety[i] < zombiey[i]+70){
zombiex[i] = 600;
zombiey[i] = Math.random()*450
score = score + 10;
}
}
}
var mainint = setInterval(function(){main();}, 50);
hey guys i'm making a lunar lander game using javascript.i want the player to land the spaceship on a black line i've drawn. but i have problems getting it right.when the player lands it properly in the line i want it to display a dialogue box which says u landed it perfectly.but the problem is even if i land it outside the line it gives me that message.so after spending sometime with it i figured out that my if statement is not working properly.it doesn't take the value from my x axis and only considers the value from my y axis.for eg lets say i drew the line from 560px to 600px on the x axis and its located at 700px on the y axis and this is my if statement if((TopPos>695)&&(rightPos>560)&&(rightPos<600)) { alert('you landed perfectly') } this is supposed to work but if i go above 600px but still maintains the height above 695 it says i have won.i have included the code could some point me out where i'm making the mistake thank you . Code: <html>
<head>
<title>Lunar lander</title>
<script language="JavaScript">
var TopPos=100;
var fuel = 300;
var gravity = 0.0001;
var speed = 0.0005;
var moveBy = 366;
var Xpix = 1000;
function animation(){
TopPos +=gravity
document.getElementById("divlander").style.top = TopPos + "px";
if ((TopPos>604)&&(Xpix<526)){
alert('win');
}
else if ((moveBy<100)&&(moveBy>500)){
alert('crashed');
}
if(TopPos<610)
window.setTimeout("animation()",30);
gravity +=0.03;
gravity += speed;
var f = document.game.fuel.value;
f--;
document.game.fuel.value = f;
if (f<=0){
document.game.fuel.value ="0";
gravity=10;
gr=0;
speed=10;
f=1;
alert('out of fuel');
}
}
function moveObj(name, Xpix, Ypix)
{
obj = document.getElementById(name);
px = parseInt(obj.style.left) + Xpix;
py = parseInt(obj.style.top) + Ypix;
obj.style.left = px;
obj.style.top = py;
}
function ProcessKeypress(e)
{
var myObj = "divlander";
var moveBy = 10;
if (e.keyCode) keycode=e.keyCode;
else keycode=e.which;
ch=String.fromCharCode(keycode);
if(ch=='a') moveObj(myObj, -moveBy, 0);
else if(ch=='d') moveObj(myObj, moveBy, 0);
else if(ch=='w') gravity = -1;
}
</script>
<form name='game'>
<body onKeyPress="ProcessKeypress(event);">
<body onload ="animation();">
<input type=button value='200' name="fuel">
<p><img id="divlander" style="z-index: 0; left: 1000px; position: absolute; top: 100px" img src="lunar_lander_72dpi2.png"></p>
<img src="Serenity2.jpg";>
<p><<body>
</body>
</form>
</html>
is it possible to make the mouse be at a given position on the screen using javascript for example i am writing a element resize script and i would like to have it so when u click on the resize button the cursor moves to the bottom right corner of the element for the starting position
Error: Code: Error ``TypeError: window.event is undefined'' [x-] in file ``file:///C:/Users/Martyn%20Ball/Desktop/test.php#'', line 6, character 0. Code: Code: <html>
<head>
<title>Testing Javascript</title>
<script type="text/javascript">
function test() {
alert(window.event.clientX);
}
function doSomething(e) {
var posx = 0;
var posy = 0;
if (!e) var e = window.event;
if (e.pageX || e.pageY) {
posx = e.pageX;
posy = e.pageY;
}
else if (e.clientX || e.clientY) {
posx = e.clientX + document.body.scrollLeft
+ document.documentElement.scrollLeft;
posy = e.clientY + document.body.scrollTop
+ document.documentElement.scrollTop;
}
// posx and posy contain the mouse position relative to the document
// Do something with this information
}
</script>
</head>
<body>
X Position: <div id="x"></div>
Y Position: <div id="y"></div>
<br />
<a href="#" onMouseOver="test()">Test Link</a><br />
<a href="#" onClick="doSomething('y')">Type of Event</a>
</body>
</html>
(Taken from external website so I can understand how it works). Hi I have a control on the left side of the page which sits inside a div. The control reacts to where the mouse is positioned within the div. This works fine in IE but I cant get it working in Firefox. Heres what I have: Code: <div id="divcon" class="boxContentLeft" OnMouseMove="SetValues(event);">
function SetValues(event)
{
var ev=(!event)?window.event:event; //Moz:IE
if (ev.pageX) { //Mozilla or compatible
/* The absolute position of the control */
var MarqPos = GetAbsPosition(divcon);
alert('MarqPos x = '+MarqPos.x+'\nMarqPos y = '+MarqPos.y);
/* Relative to this div */
MousePointerDivX = ev.pageX-MarqPos.x;
MousePointerDivY = ev.pageY-MarqPos.y;
alert('MousePointerDivX = '+MousePointerDivX+'\nMousePointerDivY = '+MousePointerDivY);
/* Relative to the top left of the viewable area */
MousePointerClientX = ev.pageX;
MousePointerClientY = ev.pageY;
alert('MousePointerClientX = '+MousePointerClientX+'\nMousePointerClientY = '+MousePointerClientY);
}
else if(ev.clientX) { //IE or compatible
/* Relative to this div */
MousePointerDivX = window.event.x;
MousePointerDivY = window.event.y;
alert('MousePointerDivX = '+MousePointerDivX+'\nMousePointerDivY = '+MousePointerDivY);
/* Relative to the top left of the viewable area */
//MousePointerClientX = window.event.clientX;
//MousePointerClientY = window.event.clientY;
//alert('MousePointerClientX = '+MousePointerClientX+'\nMousePointerClientY = '+MousePointerClientY);
/* The absolute position of the control */
var MarqPos = GetAbsPosition(divcon);
alert('MarqPos x = '+MarqPos.x+'\nMarqPos y = '+MarqPos.y);
/* The mouse position relative to top left of page */
//MousePointerX = mouseX(window.event);
//MousePointerY = mouseY(window.event);
//alert('MousePointerX = '+MousePointerX+'\nMousePointerY = '+MousePointerY);
/* The control relative to the top left of the parent control */
//var OffsetLeft = marquees.offsetLeft;
//var OffsetTop = marquees.offsetTop;
//alert('OffsetLeft = '+OffsetLeft+'\nOffsetTop = '+OffsetTop);
}
else { //old browsers
return false;
}
setInterval("",20);
}
// Calculates the object's absolute position, and width and height
function GetAbsPosition(object) {
var position = new Object;
position.x = 0;
position.y = 0;
if( object ) {
position.x = object.offsetLeft;
position.y = object.offsetTop;
if( object.offsetParent ) {
var parentpos = GetAbsPosition(object.offsetParent);
position.x += parentpos.x;
position.y += parentpos.y;
}
}
position.cx = object.offsetWidth;
position.cy = object.offsetHeight;
return position;
}
Using IE only I didnt need to find out the position of the DIV within the page as I could just use 'window.event.x' which would return the x coordinate within the DIV. I dont think you can do that with Firefox so you have to get the coordinate of the mouse and then subtract the coordinates of the DIV. But when Im calling GetAbsPosition(divcon) I get Error: divcon is not defined. Can somebody please tell me why I can call GetAbsPosition from IE and it works but I get an error calling the same thing in Firefox. Thanks it works great in chrome and strangely enough internet explorer 8 but doesn't work in firefox Code: // Detect if the browser is IE or not.
// If it is not IE, we assume that the browser is NS.
var IE = document.all?true:false;
// If NS -- that is, !IE -- then set up for mouse capture
if (!IE) document.captureEvents(Event.MOUSEMOVE)
// Set-up to use getMouseXY function onMouseMove
document.onmousemove = DRAG;
// Temporary variables to hold mouse x-y pos.s
// Main function to retrieve mouse x-y pos.s
var tempX = 0;
var tempY = 0;
function DRAG(e)
{
if (!IE)
{ // grab the x-y pos.s if browser is NS
tempX = e.pageX;
tempY = e.pageY;
}
else
{ // grab the x-y pos.s if browser is IE
tempX = event.clientX + document.body.scrollLeft
tempY = event.clientY + document.body.scrollTop
}
// catch possible negative values in NS4
if (tempX < 0){ tempX = 0; }
if (tempY < 0){ tempY = 0; }
// show the position values in the form named Show
// in the text fields named MouseX and MouseY
var w = getW();
var h = getH();
if(tempX > (w-32)){tempX = w-32;}
if(tempY > (h - 32)){tempY = h-32; }
var newX = tempX-id.offsetWidth;
var newY = tempY-header.offsetHeight-id.offsetHeight;
if(newX < 0){newX = 0; }
if(newY < 0){newY = 0; }
document.getElementById('myx').innerHTML = newX;
document.getElementById('myy').innerHTML = newY;
id.style.left = newX+"px";
id.style.top = newY+"px";
Hi all, I tried to create a mouse over effect using jquery. When user hovers #box1_trigger link, the #service_box1 div should change it's background position. The code i created is the following it's not working for some reason. html: Code: <div class="service_box box1" id="service_box1">
<a href="#" id="box1_trigger">
<h3>bla bla</h3>
<p>bla bla bla bla bla</p>
</a>
</div>
javascript: Code: <script type="text/javascript">
$(document).ready(function() {
$("#box1_trigger").hover(
function() {
$("#service_box1").stop().animate({backgroundPosition:"(0 -250px)"}, "slow");
},
function() {
$("#service_box1").stop().animate({backgroundPosition: "0 0"}, "slow");
}
);
});
</script>
css: Code: #service_box1{
width:318px; height:282px;
float:left;
background:url(images/services_panel.png) 0 0 no-repeat;
}
a#box1_trigger{
width:100%; height:100%;
float:left;
display:block;
}
Could you help me fix this please?? Hi; I'd like to ask you a question; why my mouse cursor does not sit in the position of the leftmost and topmost of a bbcode form. Thanks. my form as following; bbcode form PHP Code: <form action="story_verify1.php" method="post" name="editform" onsubmit="return checkForm(this)"> <table id="editform"> <tr> <td id="story">My story</td> </tr> <tr> <td> <input type="button" class="button" value="bold" name="bold" onclick="javascript:tag('b', '[b]', 'bold*', '[/b]', 'bold', 'bold');" onmouseover="helpline('bold')" /> <input type="button" class="button" value="italic" name="italic" onclick="javascript:tag('i', '[i]', 'italic*', '[/i]', 'italic', 'italic');" onmouseover="helpline('italic')" /> <input type="button" class="button" value="underline" name="underline" onclick="javascript:tag('u', '[u]', 'underline*', '[/u]', 'underline', 'underline');" onmouseover="helpline('underline')" /> <input type="button" class="button" value="quote" name="quote" onclick="javascript:tag('q', '[quote]', 'quote*', '[/quote]', 'quote', 'quote');" onmouseover="helpline('quote')" /> <input type="button" class="button" value="code" name="code" onclick="javascript:tag('c', '[code]', 'code*', '[/code]', 'code', 'code');" onmouseover="helpline('code')" /> <input type="button" class="button" value="url" name="url" onclick="javascript:tag('url', '[url]', 'url*', '[/url]', 'url', 'url');" onmouseover="helpline('url')" /> <input type="button" class="button" value="img" name="img" onclick="javascript:tag('img', '[img]', 'img*', '[/img]', 'img', 'img');" onmouseover="helpline('img')" /> <br /> Font size: <select name="fontsize" onchange="font('[size=' + this.form.fontsize.options[this.form.fontsize.selectedIndex].value + ']', '[/size]'); this.selectedIndex=2;" onmouseover="helpline('fontsize')" class="form_elements_dropdown"> <option value="50%" >Tiny</option> <option value="75%" >Small</option> <option value="100%" selected="selected" >Normal</option> <option value="150%" >Large</option> <option value="200%" >Huge</option> </select> Font color: <select name="fontcolor" onchange="font('[color=' + this.form.fontcolor.options[this.form.fontcolor.selectedIndex].value + ']', '[/color]'); this.selectedIndex=0;" onmouseover="helpline('fontcolor')" class="form_elements_dropdown" > <option value="black" style="color:black">Black</option> <option value="silver" style="color:silver">Silver</option> <option value="gray" style="color:gray">Gray</option> <option value="maroon" style="color:maroon">Maroon</option> <option value="red" style="color:red">Red</option> <option value="purple" style="color:purple">Purple</option> <option value="fuchsia" style="color:fuchsia">Fuchsia</option> <option value="navy" style="color:navy">Navy</option> <option value="blue" style="color:blue">Blue</option> <option value="aqua" style="color:aqua">Aqua</option> <option value="teal" style="color:teal">Teal</option> <option value="lime" style="color:lime">Lime</option> <option value="green" style="color:green">Green</option> <option value="olive" style="color:olive">Olive</option> <option value="yellow" style="color:yellow">Yellow</option> <option value="white" style="color:white">White</option> </select> <br /> <input type="text" name="helpbox" size="75" class="helpbox" readonly="readonly"/> </td> </tr> <tr> <td> Post:***<br /> <textarea rows="10" cols="50" name="Content" class="form_elements_text" id="thread"> <?php echo trim(stripslashes($_SESSION['story_content'])); ?> </textarea> </td> </tr> <tr> <td colspan="2" class="security_check"> <?php $_SESSION['fvalue']=rand(0,9); echo $_SESSION['fvalue']; ?> + <?php $_SESSION['svalue']=rand(0,9); echo $_SESSION['svalue']; ?> = <input type="text" name="result" /> ** </td> </tr> <tr> <td colspan="2" id="post"> <input type="submit" name="Post" value="Post" class="button" /> <input type="submit" name="preview" value="Preview" class="button"/> <input type="reset" value="Reset" class="button" onclick="javascript:confirm_reset();"/> </td> </tr> </table> </form> bbcode.js PHP Code: //Variables for controlling opening and closing tags (function tag) var b = 2; var i = 2; var u = 2; var q = 2; var mail = 2; var url = 2; var img = 2; //Function for creating non-font tags function tag(v, tagadd, newbut, tagclose, oldbut, name) { var r = document.selection.createRange().text; rr = tagadd + r + tagclose; if(r) { document.selection.createRange().text = rr; } else { if (eval(v)%2 == 0) { eval("window.document.editform."+name+".value = newbut;"); var content = window.document.editform.content.value; window.document.editform.content.value = content + tagadd; window.document.editform.content.focus(); } else { eval("window.document.editform."+name+".value = oldbut;"); var content = window.document.editform.content.value; window.document.editform.content.value = content + tagclose; window.document.editform.content.focus(); } eval(v+"++;"); } } //Function for adding font color and size tags function font(bbopen, bbclose) { var r = document.selection.createRange().text; rr = bbopen + r + bbclose; if(r) { document.selection.createRange().text = rr; }else{ var post = document.editform.post; post.value += bbopen +r+ bbclose; post.focus(); } return; } function smilie (tag) { var myField; tag = ' ' + tag + ' '; if (document.getElementById('thread') && document.getElementById('thread').type == 'textarea') { myField = document.getElementById('thread'); } else { return false; } if (document.selection) { myField.focus(); sel = document.selection.createRange(); sel.text = tag; myField.focus(); } else if (myField.selectionStart || myField.selectionStart == '0') { var startPos = myField.selectionStart; var endPos = myField.selectionEnd; var cursorPos = endPos; myField.value = myField.value.substring(0, startPos) + tag + myField.value.substring(endPos, myField.value.length); cursorPos += tag.length; myField.focus(); myField.selectionStart = cursorPos; myField.selectionEnd = cursorPos; } else { myField.value += tag; myField.focus(); } } //Helpbox messages bold_help = "Bold text: [b]text[/b]"; italic_help = "Italic text: [i]text[/i]"; underline_help = "Underline text: [u]text[/u]"; quote_help = "Quote text: [quote]text[/quote] or [quote=name]text[/quote]"; code_help = "Code display: [code]code[/code]"; img_help = "Insert image: [img]http://image_url[/img]"; url_help = "Insert URL: [url]http://url[/url] or [url=http://url]URL text[/url]"; fontcolor_help = "Font color: [color=red]text[/color] Tip: you can also use color=#FF0000"; fontsize_help = "Font size: [size=50%]small text[/size]"; //Function for displaying help information // Shows the help messages in the helpline window function helpline(help) { var helpbox = document.editform.helpbox; helpbox.value = eval(help + "_help"); } //Function to confirm reset function confirm_reset () { if(confirm("If you continue you will loose everything you have entered so far. \n \n" + "Click OK to proceed and start again. \n \n Alternatively click cancel to continue " + "working on your post.")) { return true; } else { return false; } } //Check the form submission for errors function checkForm() { var subject = document.editform.subject; var post = document.editform.post; //Check to make sure post lengths are sensible if (subject.value.length < 2 && post.value.length < 2) { alert("This is a short post!" + " \n \n " + "We require that each post (and subject) \n" + "be at least 2 characters long. \n \n" + "Go back and try again."); return false; } else { if (subject.value.length < 2) { alert("We require that the subject \n" + "be at least 2 characters long. \n \n" + "Go back and try again."); return false; } else { if (post.value.length < 2) { alert("We require that each post \n" + "be at least 2 characters long. \n \n" + "Go back and try again."); return false; } else { return true; } } } } I'm new to javascript and am not sure why this works in firefox and not chrome. I am trying to create a script that keeps an object fixed horizontally while bing positioned absolute vertically. if I replace the toPP variable in document.getElementById('fire').style.top = toPP; with say '50px' it will move the element down 50 pxs, but how I have it currently it doesn't do anything in chrome Code: <script type="text/javascript" >
window.onscroll = function()
{
if( window.XMLHttpRequest ) {
var x = 0 -document.documentElement.scrollTop;
var toP = String(x);
var toPP = toP + "px";
document.getElementById('fire').style.position = 'fixed';
document.getElementById('fire').style.top = toPP;
}
}
</script>
Hi all, I am looking to create this in JS/DHTML/CSS that I found in a flash script you can view he http://www.melodicmedia.com/dev/expa...ash_flash.html I want the red expanding and contracting circle to be on top of a image so it only shows the parts of the image that the circle is around. Any help you have would be much appreciated =) Thank you =) Light and Love and Healing to you, -Patrick Arden McNally Hey everyone, I've got a section on my website where I have 2 images placed on top of each other when the user rollovers the image, the image ontop fades out revealing the image underneath. You can then click on this underneath image to open a fancybox window and scroll through pictures. My problem is that sometimes the fade out gets 'stuck' and after closing the fancybox window, the image reamins half faded out etc and the rollover doesn't work anymore. here's my code: Code: <style type="text/css" media="screen">
.js #animators { position: relative; height: 100px}
.js #animators div.container { position: absolute; left: 0; top: 0
</style>
<script type="text/javascript">
document.documentElement.className += " js"; // Add js class to the HTML element
$(function(){
var $containers = $("#animators > div").hide();
$('#show').show();
$('tr td a.c').each(function(i,el){
var idx = i;
$(this).click(function(e){
var $target = $containers.filter(':eq(' + idx + ')');
if($containers.filter(':visible').not($target).length){
$containers.filter(':visible').fadeOut();
}
$target.not(':visible').fadeIn();
e.preventDefault();
})
})
});
</script>
<div class="thumbnail" style="margin-top:5%; margin-right:2%;">
<div class="visible-image">
<img src="images/illustrationslabel.jpg" />
</div>
<div class="appearing-image"><img onclick='$("a.illustrations:first").trigger("click");' src="images/illustrations.jpg" />
</div>
</div>
mc im making a sniper game where you shoot apples, and i need to check when the crosshairs are on the apple whenever the user clicks the canvas (note that the onclick listener is in the html, thats why you dont see it, and ive checked that it works). This code doesnt work Code: var crosshair = [250, 200];
var appley = [-100,-400,0,-250];
var applex = [0,200,400,500];
var canvas = document.getElementById("game");
function getMousePos(canvas, evt) {
var rect = canvas.getBoundingClientRect();
return {
x: evt.clientX - rect.left,
y: evt.clientY - rect.top
};
}
var context = canvas.getContext('2d');
canvas.addEventListener('mousemove', function(evt) {
var mousePos = getMousePos(canvas, evt);
crosshair[0] = mousePos.x;
crosshair[1] = mousePos.y;
}, false);
function draw(x, y, image){
var context = canvas.getContext("2d");
var imageObj = new Image();
imageObj.onload = function() {
context.drawImage(imageObj, x, y);
};
imageObj.src = image;
}
function shoot(){
for(i = 0; i < 4; i++){
if(crosshair[0]-400 > applex[i] && crosshair[0]-400 < applex[i]+80 && // THIS IS THE COLLISION
crosshair[1]-300 > appley[i] && crosshair[1]-300 < appley[i]+80){
appley = 500;
alert("hit");
}
}
}
function main(){
draw(0,0,"background.jpg");
for(i = 0; i < 4; i++){
draw(applex[i],appley[i],"apple.png");
appley[i] = appley[i]+10;
if(appley[i] > 450){
appley[i] = -50;
applex[i] = Math.floor((Math.random() * 5) + 1)*100;
}
}
draw(crosshair[0]-400, crosshair[1]-300, "crosshair.png");
}
var mainint = setInterval(function(){main();}, 100);
help plz I've got to have a typo somewhere, but i can't seem to find it. I need a new pair of eyes to point it out for me. background: trying to code a mouseover link for a nav bar. everything is working( hyperlink, normal image shows up) but when i mouse over the image swap doesn't happen. I have 2 parts of code. 1st preloads images and does the swap function. loads in <head> See below: Code: <SCRIPT language="javascript" type="text/javascript">
if (document.images)
{
/* preload images */
var subcontractorsOn = new Image ();
subcontractorsOn.scr = "subcontractorsOn.gif";
var subcontractorsOff = new Image ();
subcontractorsOff.scr = "subcontractorsOff.gif";
}
function mouseOn (imgName)
{
if (document.images)
document [imgName].scr = eval (imgName + "On.scr");
}
function mouseOff (imgName)
{
if (document.images)
document [imgName].scr = eval (imgName + "Off.scr");
}
</SCRIPT>
2nd just calls the functions to preform the swap. this is in the <body> see code below Code:
<a href="subcontractors.htm" onMouseOut="mouseOn('subcontractors')"
onMouseOver="mouseOff('subcontractors')">
<img src="subcontractorsOff.gif" height="40" width="133" name="subcontractors" id="subcontractors" border="0" alt="subcontractors"></a>
any insight would be great. regards, Fatmann66 want to get selected text and image values .Since there is an randomly changed text and image on my page.I used window.getSelection() but this will return only selected text values not images ..so please guide me to solve this problem.
I am having troubles getting two polygons to collide and react properly. For now, I just have two boxes. One box is stationary in the center of my canvas while another one is controlled by the keypad arrow keys and flies around. I have no problem detecting when my flying box intersects the stationary box. However, what I am having troubles with is getting the flying box to hit the stationary box and react as if it was an actual object blocking it's path. For now I just need to have my flying box be able to hit the stationary box on any side and have the stationary box block the flying box's motion. At some point, however, I will likely need to do this same kind of reaction between multiple edged 2d polygons. Can anyone help me with this simple box example and also help me track down a more complex scenario similar to this: http://www.codeproject.com/Articles/...sion-Detection This article seems to be exactly what I am looking for but it is in C#. The way the flying object just slides along the edge of the intersecting polygon is all I need my flying object to do. However, I need an example in javascript so that I can incorporate it into an HTML5 canvas object. i cant get collission detection to work. i tryed but it always caused an infinite loop. heres the code. Code: <html>
<!-- main file.-->
<head>
<title>lightning generator</title>
</head>
<body>
<canvas id='world' width='500' height='500' style='border: 1px solid black; padding:0;'></canvas>
<script type="text/javascript" src='world.js'></script>
<script type='text/javascript' src='eC.js'></script>
<script type='text/javascript' src='world.ground.js'></script>
<script type='text/javascript'>
world.bolt = {
}
;
world.bolt.paths = [];
// main obj inits
world.bolt.draw = function(){
var x, y;
for( var id = 0; id <= world.bolt.draw.num; id ++ ){
world.ctx.moveTo( world.bolt.paths[id].x[world.bolt.paths[id].x.length-1], world.bolt.paths[id].y[world.bolt.paths[id].y.length-1] );
var mdx=Math.floor(Math.random()*world.bolt.paths[id].mdx);
x = world.bolt.paths[id].x[world.bolt.paths[id].iters] + ((Math.random()<Math.random())?mdx:-mdx);
y = ++ world.bolt.paths[id].iters;
world.bolt.paths[id].x.push( x );
world.bolt.paths[id].y.push( y );
world.ctx.strokeStyle = world.bolt.paths[id].color;
world.ctx.lineTo( x, y );
world.ctx.stroke();
//world.ctx.beginPath();
} if(x%3==0){ world.ctx.fillStyle=world.skyColor;
world.ctx.fillRect(0,0,world.w,world.h);}
}
world.bolt.draw.num=-1;
world.bolt.cpath = function( x, y, mdx, srate, id, color ){
world.bolt.paths[id] = {
}
;
world.bolt.paths[id].iters = 0;
world.bolt.paths[id].x = [];
world.bolt.paths[id].y = [];
world.bolt.paths[id].x[0] = x;
world.bolt.paths[id].y[0] = y;
world.bolt.paths[id].mdx = mdx;
world.bolt.paths[id].srate = srate;
world.bolt.paths[id].color = color;
world.bolt.draw.num += 1;
}
world.bolt.cpath(250,0, 5,5,0,'rgba(255,255,150,.5)');
window.setInterval(world.bolt.draw,100)
window.setTimeout('world.bolt.cpath(125,0,5,5,1,"rgba(255,10,0,.5)")',1000);
</script>
</body>
</html>
Code: //world.js
var world = {
skyColor:'rgba(0,0,100,.009)'
}
;
world.canvas = document.getElementById( 'world' )
world.canvas.cstyle = document.defaultView.getComputedStyle( world.canvas, null )
world.w = parseInt( world.canvas.cstyle.width, 10 );
world.h = parseInt( world.canvas.cstyle.height, 10 );
world.ctx = world.canvas.getContext( '2d' );
finally, Code: // world.ground.js
world.ground = {
}
;
world.ground.level = [];
world.ground.make = function( GArray, length ){
world.ctx.strokeStyle = '#000000';
world.ground.level = [];
world.ctx.fillStyle = '#FFF';
world.ctx.fillRect( 0, 0, world.w, world.h );
world.ground.level = GArray;
for ( world.ground.make.i = 0; world.ground.make.i <= length; world.ground.make.i ++ ){
if ( GArray[world.ground.make.i + 1] === undefined ){
GArray[world.ground.make.i + 1] = GArray[world.ground.make.i];
}
world.ctx.moveTo( world.ground.make.i, ( world.h ) );
world.ctx.lineTo( world.ground.make.i, ( world.h - GArray[world.ground.make.i] ) );
}
world.ctx.stroke();
world.ctx.beginPath();
}
;
world.ground.create = function( func, width ){
func = ec( func );
if( func === false ){
alert( 'Pass equation as a string without the "y=", "f(x)=", "g(x)=" or similar.' );
return world;
}
if( func == 'perspicaciousness' ){
return world;
}
var temp = [];
for( var x = 0; x <= width; x ++ ){
temp[x] = eval( func );
}
world.ground.make( temp, width );
}
;
world.ground.create.test='4';
world.ground.create( world.ground.create.test, 500 );
in the end of world.bolt.cpath,there should be a way to use the local varis X and Y, and world.ground.js's world.ground.level[] to detect it. sorry for the gigantic length. thanks in advanced. the jsnerd Using onclick=window.open function in js to open a pdf file link in a new popup window. Works fine to display the file onscreen, but not if the user wants to save the file client-side to their computer. The right-hand-button context menu for the mouse will allow the user to download, but the file saved will be a html dump file for the webpage and the name of the file will be that for the webpage. Of course I can use the easy <a href> method for download links and the mouse context menu options will be as expected, but I can only use target="-blank" or target="_self" . I need a popup window to open. Could use : oncontextmenu="alert('Left click the link to open, and then SAVE from with the pdf viewer') to advise users how to save the file, and could use "javascript: void(0)" to eliminate most mouse context menu options, so the user won't bother try. So how can I get a link to a file which can be viewed in a popup window and downloaded using mouse right-hand context menu? Any advice massively appreciated! Hello I am hoping to position some JavaScript on a Web page. Would I use something like this: CSS Code: #diagram {
margin-left: 200px;
margin-top: 100px;
}
HTML
<script>JavaScript code here</script>
<div id="diagram"
</div>
Thanks for any advice. |
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