マウスの方向に遅延して回転するオブジェクト|HTML5

マウスの方向に遅延して回転するオブジェクト|HTML5

マウスの方向に遅延して回転するオブジェクト|HTML5(HTML5, JavaScript, CSS3) : デモ

マウスの方向に遅延して回転するオブジェクト|HTML5(HTML5, JavaScript, CSS3) : ZIPファイル(4kb)

1.HTML

<!DOCTYPE html>
<html lang="jp">
    <head>
        <meta charset="UTF-8" />
        <title>遅延して回転するオブジェクト|Rotate with Mouse Slowly</title>
        <link href="css/base.css" rel="stylesheet" type="text/css">
        <script src="js/base.js"></script>
        <script src="js/devicecheck.js"></script>
    </head>
    <body>
        <div id="contents">
            <canvas id="canvas" width="300" height="300">
            </canvas>
            <div id="deg"></div>
        </div>
    </body>
</html>

2.CSS

@charset "utf-8";
  
body
{
    margin:0;
    padding:0;
    background-color: #fff;
    font-family:Helvetica, HiraKakuProN-W3, sans-serif; 
    font-size:12px;
    color:#000;
}
  
#contents
{
    position: absolute;
    top: 0;
    left: 0;
    width: 300px;
    height:300px;
    border: 1px solid #000;
    overflow:hidden;
}
  
#canvas
{
    position: absolute;
    top: 0;
    left: 0;
    width: 300px;
    height:300px;
}
 
#rad
{
    position: absolute;
    top: 10px;
    left: 10px;
    width: 10px;
    height:10px;
}

3.JavaScript

base.js

window.addEventListener("load", init, false);
  
var centerX;
var centerY;
var theCanvas;
var ctx;
var currentX0;
var currentY0;
var currentX1;
var currentY1;
var currentX2;
var currentY2;
var points = new Array();
var mouseX;
var mouseY;
var speed = 3;
var flag = false;
var mouseX1 = 0;
var mouseY1 = 0;
var mouseX=0;
var mouseY=0;
var rotate1 = 0;
var rotate2 = 0;
  
function init()
{
    document.getElementById('canvas').addEventListener('touchstart', function() 
    {
        event.preventDefault();
    });
    document.getElementById('canvas').addEventListener('touchmove', function() 
    {
        event.preventDefault();
    });
    document.getElementById('canvas').addEventListener('touchend', function() 
    {
        event.preventDefault();
    });
    //ボタンタイプ
    if(g_mobiledevice==true)
    {
        buttonStart = 'touchstart';
        buttonMove = 'touchmove';
        buttonEnd = 'touchend';
    }
    else
    {
        buttonStart = 'mousedown';
        buttonMove = 'mousemove';
        buttonEnd = 'mouseup';
    }
      
    theCanvas = document.getElementById("contents");
    centerX = (theCanvas.currentStyle || document.defaultView.getComputedStyle(theCanvas,'')).width;
    centerX = Number(centerX.replace('px',''));
    centerX =  centerX / 2;
    centerY = (theCanvas.currentStyle || document.defaultView.getComputedStyle(theCanvas,'')).height;
    centerY = Number(centerY.replace('px',''));
    centerY =  centerY / 2;
      
    theCanvas = document.getElementById("canvas");
      
    theCanvas.addEventListener(buttonMove, mouseDownHandler, false);
      
    function mouseDownHandler(e) 
    {
         
        if(g_mobiledevice)
        {
            var rect = event.currentTarget.getBoundingClientRect();
            mouseX = event.touches[0].pageX - rect.left-centerX;
            mouseY = event.touches[0].pageY - rect.top-centerY;
             
            mouseX1 =  event.touches[0].pageX - rect.left;
            mouseY1 =  event.touches[0].pageY - rect.top;
        }
        else
    if(g_browsername == 'MSIE' || g_browsername == 'Opera')
    {
        rect = document.getElementById("canvas").getBoundingClientRect();
        mouseX = event.clientX - rect.left - centerX;
        mouseY = event.clientY - rect.top - centerY;
                 
                mouseX1 =  event.clientX - rect.left;
            mouseY1 =  event.clientY - rect.top;
    }
    else
    if(g_browsername == 'Firefox')
    {
        rect = document.getElementById("canvas").getBoundingClientRect();
        mouseX = e.clientX - rect.left - centerX;
        mouseY = e.clientY - rect.top - centerY;
                 
                mouseX1 =  e.clientX - rect.left;
            mouseY1 =  e.clientY - rect.top;
    }
        else
        {
            rect = event.currentTarget.getBoundingClientRect();
            mouseX =  event.clientX - rect.left-centerX;
            mouseY =  event.clientY - rect.top-centerY;
             
            mouseX1 =  event.clientX - rect.left;
            mouseY1 =  event.clientY - rect.top;
        }
    }
    ctx =  theCanvas.getContext("2d");
      
    var x = Math.cos(18*Math.PI/180)*50*1.62;
    var y = Math.sin(18*Math.PI/180)*50*1.62;
  
    points.push({x:-(x/2),y:-y});
    points.push({x:x/2,y:0});
    points.push({x:-(x/2),y:y});
     
    currentX0 = points[0].x;
    currentY0 = points[0].y;
    currentX1 = points[1].x;
    currentY1 = points[1].y;
    currentX2 = points[2].x;
    currentY2 = points[2].y;
    mouseX=0;
    mouseY=0;
    mouseX1 = 300;
    mouseY1 = 150;
    set();
}
  
function set()
{
    var degree=0;
    var radian=0;
    var dx=0;
    var dy=0;
    var mx =0;
    var my=0;
     
     
     
    function animation()
    {
        ctx.clearRect(0,0,300,300); 
       
        dx = (mouseX1-centerX);
        dy = (mouseY1-centerY);
 
        rotate2 = Math.atan2(dy,dx)*180/Math.PI;
        var offset = rotate2-rotate1;
        offset -= Math.floor(offset/360)*360;
        if(offset>180)
        {
            offset-=360;
        }
         
        if(offset<-180)
        {
            offset+=360;
        }
         
        var difference = offset*0.1;
         
        rotate1+=difference;
         
        radian = rotate1*Math.PI/180;
         
        currentX0 = Math.cos(radian)*points[0].x-Math.sin(radian)*points[0].y;
        currentY0 = Math.sin(radian)*points[0].x+Math.cos(radian)*points[0].y;
        currentX1 = Math.cos(radian)*points[1].x-Math.sin(radian)*points[1].y;
        currentY1 = Math.sin(radian)*points[1].x+Math.cos(radian)*points[1].y;
        currentX2 = Math.cos(radian)*points[2].x-Math.sin(radian)*points[2].y;
        currentY2 = Math.sin(radian)*points[2].x+Math.cos(radian)*points[2].y;
        //document.getElementById('deg').innerHTML=radian*180/Math.PI;
         
         
        draw(currentX0,currentY0,currentX1,currentY1,currentX2,currentY2);
    }
    setInterval(animation, 1000/30);
}
  
function draw(currentX0,currentY0,currentX1,currentY1,currentX2,currentY2)
{
    ctx.strokeStyle="#000000";
    ctx.lineWidth=1;
    ctx.beginPath();
    ctx.moveTo(centerX+currentX0, centerY+currentY0);
    ctx.lineTo(centerX+currentX1, centerY+currentY1);
    ctx.lineTo(centerX+currentX2, centerY+currentY2);
    ctx.lineTo(centerX+currentX0, centerY+currentY0);
    ctx.stroke();
}

devicecheck.js

var g_mobiledevice = false; //iPhone、iPad、Androidのときtrue
var g_browsername = 'unknown';
var g_browserver = -1;
 
if(checkUserAgent() == false)
{
    window.alert('このブラウザは対象外です');
}
 
function checkUserAgent()
{
    var ua = navigator.userAgent;
 
    //iPhoneか?  
    var mstr = ua.match(/iPhone OS \d+/);
    if(mstr != null){
        var vstr = mstr[0].match(/\d+/);
        if(parseInt(vstr[0]) >= 3) 
        {
            g_mobiledevice = true;
            g_browsername = 'iPhone';
            //alert('major-version ' + vstr);
            return true;
        }
    }
    //iPadか?
    if(ua.indexOf('iPad') > -1)
    {
        mstr = ua.match(/CPU OS \d+/);
        if(mstr != null)
        {
            var vstr = mstr[0].match(/\d+/);
            if(parseInt(vstr[0]) >= 3) {
                g_mobiledevice = true;
                g_browsername = 'iPad';
                //alert('major-version ' + vstr);
                return true;
            }       
        }       
    }   
    //Androidか? 
    var mstr = ua.match(/Android \d+\.\d+/);
    if(mstr != null)
    {
        g_browsername = 'Android';
        var vstr = mstr[0].match(/\d+\.\d+/);
        g_browserver = parseFloat(vstr[0]);
        g_mobiledevice = true;
        if(pg_browserver > 2.1) 
        {
            //alert('version ' + vstr);
            return true;
        }
    }
    //Chromeか?
    mstr = ua.match(/Chrome\/\d+/);
    if(mstr != null)
    {
        g_browsername = 'Chrome';
        var vstr = mstr[0].match(/\d+/);
        g_browserver = parseInt(vstr[0]);
        if(g_browserver >= 9) 
        {
            //alert('major-version ' + vstr);
             
            return true;
        }       
    }
    //Safariか?
    if(ua.indexOf('Safari') > -1)
    {
        mstr = ua.match(/Version\/\d+/);
        if(mstr != null){
            var vstr = mstr[0].match(/\d+/);
            if(parseInt(vstr[0]) >= 5) 
            {
                g_browsername = 'Safari';
                //alert('major-version ' + vstr);
                return true;
            }       
        }       
    }
    //Internet Explorerか?
    mstr = ua.match(/MSIE \d+/);
    if(mstr != null)
    {
        var vstr = mstr[0].match(/\d+/);
        if(parseInt(vstr[0]) >= 9) 
        {
            g_browsername = 'MSIE';
            //alert('major-version ' + vstr);
            return true;
        }       
    }
    //Firefoxか?
    mstr = ua.match(/Firefox\/\d+/);
    if(mstr != null){
        var vstr = mstr[0].match(/\d+/);
        if(parseInt(vstr[0]) >= 4) 
        {
            g_browsername = 'Firefox';
            //alert('major-version ' + vstr);
            return true;
        }       
    }
    //Operaか?
    if(ua.indexOf('Opera') > -1)
    {
        mstr = ua.match(/Version\/\d+/);
        if(mstr != null){
            var vstr = mstr[0].match(/\d+/);
            if(parseInt(vstr[0]) >= 11) 
            {
                g_browsername = 'Opera';
                //alert('major-version ' + vstr);
                return true;
            }       
        }       
    }
     
    return false;
}

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