在jQuery動畫的每一步捕獲鼠標座標

我想在jQuery動畫期間獲取鼠標座標，我這樣做是因爲我正在處理一個交互式插件，它將內部背景圖像一個div從cover css屬性到100%它的規模是當用戶瀏覽元素時。在jQuery動畫的每一步捕獲鼠標座標

我即將完成plug-in，但動畫是有問題的，因爲它工作在由jQuery的mousemove事件觸發的鼠標的最後位置。

確實存在某種避免該問題的方法嗎？

這是我的情況：

$(settings.selector).hover(function (e) { 
    $(this).bind('mousemove', setFollowMouse); 
}, function() { 
    $(this).unbind('mousemove', setFollowMouse); 
    zoomOut(); 
}); 

var setFollowMouse = function (e) { 
    var o = {offsetLeft:this.offsetLeft, offsetTop:this.offsetTop}; 
    if (!settings.bg.zooming_in && settings.bg.current_scale != 100) { 
    settings.bg.zooming_in = true; 
    zoomIn(e, o); 
    } else { 
     followMouse(e, o); 
    } 
} 

var zoomIn = function (e, o) { 

    $({scale:settings.bg.min_perc}).animate ({ 
     scale:100 
    },{ 
     easing:settings.zoom_in.easing, 
     duration:settings.zoom_in.duration, 
     step:function() { 
      settings.bg.current_scale = this.scale; 
      followMouse(e, o); 
     }, 
     complete:function() { 
      settings.bg.current_scale = 100; 
      settings.bg.zooming_in = false; 
      followMouse(e, o); 
     } 
    }); 
} 

var followMouse = function (e, o) { 

    var m_x = e.pageX - o.offsetLeft; 
    var m_y = e.pageY - o.offsetTop; 

    settings.bg.perc_pos_x = ((m_x * 100)/(a_w - bg_w)) + '%'; 
    settings.bg.perc_pos_y = ((m_y * 100)/(a_h - bg_h)) + '%'; 

    var bg_w = getScalePercent(settings.bg.width, settings.bg.current_scale); 
    var a_w = settings.container.width; 

    var bg_h = getScalePercent(settings.bg.height, settings.bg.current_scale); 
    var a_h = settings.container.height; 

    var bpx = - (bg_w - a_w) * m_x/a_w; 
    var bpy = - (bg_h - a_h) * m_y/a_h; 

    $(settings.selector).css({ 
     backgroundPosition:bpx + 'px ' + bpy + 'px' 
     ,backgroundSize:bg_w + 'px ' + bg_h + 'px' 
    }); 
}

正如你看到的，我用動畫來計算背景圖像的逐步擴展，並試圖與後續的鼠標方法計算它，但如果我STO移動鼠標，動畫與最後的mousemoveevent.pageX和Y鼠標位置一起工作。

我已經這樣做了，因爲如果我試圖用鼠標不斷改寫它，我的動畫方法會變得很流暢。

我應該按照一些不同的方式來避免這個錯誤嗎？

來源

2012-02-04 vitto

我剛剛解決了這個問題，這個簡單的編輯給我的代碼：

var setFollowMouse = function (e) { 

    settings.mouse.x = e.pageX - this.offsetLeft; 
    settings.mouse.y = e.pageY - this.offsetTop; 

    if (!settings.bg.zooming_in && settings.bg.current_scale != 100) { 
     settings.bg.zooming_in = true; 
     zoomIn(); 
    } else { 
     followMouse(); 
    } 
}

老一：

var setFollowMouse = function (e) { 

    var o = {offsetLeft:this.offsetLeft, offsetTop:this.offsetTop}; 

    if (!settings.bg.zooming_in && settings.bg.current_scale != 100) { 
     settings.bg.zooming_in = true; 
     zoomIn(e, o); 
    } else { 
     followMouse(e, o); 
    } 
}

這已刪除的錯誤行爲。

來源

2012-02-04 11:16:07 vitto

原諒我狡猾的數學;但這應該有所幫助！

<html> 
    <head> 
     <script type="text/javascript" charset="utf-8"> 
      window.onload = function() { 
       var img = new Image(); 
       img.src = 'http://wallpapers.free-review.net/wallpapers/23/Autumn_Theme_-_Windows_7_Backgrounds.jpg'; 

       var canvas = document.getElementById("canvas1"); 
       canvas.width = img.width; 
       canvas.height = img.height; 
       canvas.addEventListener('mousemove', onMouseMove, false); 

       var ctx = canvas.getContext("2d"); 
       var scale = 0.9; 

       var scaledwidth = canvas.width * scale; 
       var scaledheight = canvas.height * scale; 

       var scaledcenterX = scaledwidth /2; 
       var scaledcenterY = scaledheight /2; 

       var animloop = setInterval(function() { 
        ctx.clearRect(0, 0, canvas.width, canvas.height); 
        ctx.drawImage(img, scaledwidth, scaledheight, canvas.width - scaledcenterX, canvas.height - scaledcenterY, 0, 0, canvas.width, canvas.height); 
       }, .01); 

       function onMouseMove(e) { 
        mouseX = e.clientX - canvas.offsetLeft; 
        mouseY = e.clientY - canvas.offsetTop; 
        scale = mouseX/1000; 
        scaledwidth = canvas.width * scale; 
        scaledheight = canvas.height * scale;      
       } 

      }; 

     </script> 
     <style> 
      body { 
       background: #001; 
       background-size: cover; 
       overflow: hidden; 
      } 
      #canvas1 { 
       position: absolute; 
       top: 0; 
       left: 0; 
       padding: 0; 
       margin: 0; 
       height: 100% auto; 
      } 
     </style> 
    </head> 
    <body> 
     <canvas id="canvas1"></canvas> 
    </body> 
</html>

來源

2012-02-04 11:00:13

我真的很想和canvas一起工作，因爲現在我優先考慮完成「jQuery插件」的路徑，因爲現在已經完成了！ – vitto 2012-02-04 11:32:27

在jQuery動畫的每一步捕獲鼠標座標

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