jQuery汽车车速表效果js代码

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以下是 jQuery汽车车速表效果js代码的示例演示效果:

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HTML代码(index.html):

<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>jQuery汽车车速表效果</title>
    <script src="jquery-1.4.min.js"></script>
    <script src="jquery.speedometer.js"></script>
    <script src="jquery.jqcanvas-modified.js"></script>
    <script src="excanvas-modified.js"></script>
    <script>
        $(function () {
            $('#test').speedometer();

            $('.changeSpeedometer').click(function () {
                $('#test').speedometer({ percentage: $('.speedometer').val() || 0 });
            });

        });
    </script>
</head>

<body>
    <center>
        <br><br><br>
        <input type="text" class="speedometer" value="90"></input>
        <button class="changeSpeedometer">Submit</button><br />
        <div id="test">90 </div>
    </center>
</body>
</html>

JS代码(jquery.jqcanvas-modified.js):

/*The MIT LicenseCopyright (c) 2008 David Kwast <david _dot_ kwast _at_ gmail>Permission is hereby granted,free of charge,to any person obtaining a copyof this software and associated documentation files (the "Software"),to dealin the Software without restriction,including without limitation the rightsto use,copy,modify,merge,publish,distribute,sublicense,and/or sellcopies of the Software,and to permit persons to whom the Software isfurnished to do so,subject to the following conditions:The above copyright notice and this permission notice shall be included inall copies or substantial portions of the Software.THE SOFTWARE IS PROVIDED "AS IS",WITHOUT WARRANTY OF ANY KIND,EXPRESS ORIMPLIED,INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THEAUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,DAMAGES OR OTHERLIABILITY,WHETHER IN AN ACTION OF CONTRACT,TORT OR OTHERWISE,ARISING FROM,OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS INTHE SOFTWARE.*/
//keeps closure(function ($){
	var binded = false,verifySizeList = [],//jakemod:this variable used to be declared inside $.fn.jqcanvas->this.eachjqcanvas_id = $('canvas').size();
	$.fn.jqcanvas = function (callback,options){
	this.each(function (){
	var opts = $.extend({
}
,$.fn.jqcanvas.defaults,options),$this = $(this),top = $this.offset().top,left = $this.offset().left,width = getMasterWidth($this),height = getMasterHeight($this);
	/* jakemod:this variable used to assign ID based purely on number of canvas elements,but introduced bug if we are dynamically removing and inserting new canvases. Duplicate IDs were being generated,and un-targeted canvases would disappear since they shared an ID. */
//var jqcanvas_id = $('canvas').size();
	//jakemod:Simple increment ensures unique ID for every canvas elementjqcanvas_id += 1;
	var canvas_id = "jqcanvas_"+jqcanvas_id;
	$this.data("callback",callback);
	$this.data("top",top);
	$this.data("left",left);
	$this.data("width",width);
	$this.data("extraWidth",opts.extraWidth);
	$this.data("height",height);
	$this.data("jqcanvas_id",canvas_id);
	var canvas = $(create_canvas(canvas_id,top,left,width,height,$this,name,options));
	canvas.each(function (){
	redraw($this,this,options);
	//this == canvas element (not jquery obj)}
);
	if ( opts.verifySize ){
	verifySizeList.push($this);
	if ( !(binded) ){
	//Only bind this events once binded = true;
	setInterval(verifyResize,$.fn.jqcanvas.global_options.verifyResizeInterval);
	$(window).resize(verifyResize);
}
}
}
);
	return $(this);
}
;
	$.fn.jqcanvas.defaults ={
	extraWidth:0,verifySize:true}
$.fn.jqcanvas.global_options ={
	verifyResizeInterval:1000}
function hasMoved(master){
	var offset = master.offset();
	if (offset.top != master.data("top")){
	return true}
else if (offset.left != master.data("left")){
	return true}
else{
	return false}
;
}
function create_canvas(canvas_id,top,left,width,height,$this,name,options){
	var border_left = parseInt($this.css('borderLeftWidth')) || 0;
	var border_top = parseInt($this.css('borderTopWidth')) || 0;
	var position_left = parseInt(left);
	var position_top = parseInt(top);
	var new_position_left = (position_left+border_left).toString() + 'px' var new_position_top = (position_top+border_top).toString() + 'px' var canvasCSS ={
	zIndex:options.z || 1,position:"static"//,//left:new_position_left,// top:new_position_top}
;
	var new_width = width + $this.data("extraWidth");
	// Maybe we can refactor here var el = document.createElement('canvas');
	el.setAttribute('id',canvas_id);
	el.setAttribute('width',new_width);
	el.setAttribute('height',height);
	if($.browser.msie){
	G_vmlCanvasManager.initElement(el);
}
;
	var canvas = $(el);
	$this.prepend(canvas);
	canvas.data("classes",options.className);
	canvas.addClass("jqcanvas " + options.className );
	// canvas.width(width);
	// canvas.height(height);
	canvas.css(canvasCSS);
	return el;
}
function redraw(master,canvas,options){
	var width = getMasterWidth(master);
	var height = getMasterHeight(master);
	// Remove previous canvas and create it again with new width and height var canvas_id = master.data("jqcanvas_id");
	var name = $('#'+canvas_id).data('classes');
	$('#'+canvas_id).remove();
	canvas = create_canvas(canvas_id,master.data("top"),master.data("left"),width,height,master,name,options);
	master.data("jqcanvas",$(canvas));
	// Canvas size can be different from its master element size master.data("callback")(canvas,$(canvas).width(),$(canvas).height());
}
function move(master,canvas,top,left){
	$(canvas).css({
	top:top,left:left}
);
	// if($.browser.msie){
	// redraw(master,canvas);
	//}
}
function verifyMove(master,canvas){
	if (hasMoved(master)){
	var offset = master.offset();
	canvas.each(function(){
	move(master,this,offset.top,offset.left);
	//this == canvas element (not jquery obj)}
);
	master.data("top",offset.top);
	master.data("left",offset.left);
}
}
function getMasterWidth(master){
	return parseInt(master.css("padding-right")) + parseInt(master.css("padding-left")) + master.width()}
function getMasterHeight(master){
	return parseInt(master.css("padding-bottom")) + parseInt(master.css("padding-top")) + master.height()}
function hasResized(master){
	var width = getMasterWidth(master) var height = getMasterHeight(master) if (width != master.data("width")){
	return true}
else if (height != master.data("height")){
	return true}
else{
	return false}
;
}
function verifyResize(){
	jQuery.map(verifySizeList,function(master){
	var canvas = master.data("jqcanvas");
	verifyMove(master,canvas);
	if (hasResized(master)){
	canvas.each(function(){
	redraw(master,this);
	//this == canvas element (not jquery obj)}
);
	master.data("width",getMasterWidth(master));
	master.data("height",getMasterHeight(master));
}
}
);
}
}
)(jQuery);

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