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div我试图在jQuery 动画期间获取鼠标坐标，我这样做是因为我正在开发一个交互式插件，cover当100%用户越过元素。

我快要完成了，plug-in但是动画有问题，因为它在mousemovejQuery 事件触发的鼠标的最后一个位置上工作。

是否存在某种避免该问题的方法？

这是我的情况：

$(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'
    });
}

如您所见，我使用动画来计算背景图像的渐进缩放，并尝试使用跟随鼠标方法进行计算，但如果我停止移动鼠标，动画将使用最后一个mousemove event.pageX鼠标Y位置。

我这样做是因为如果我试图用鼠标连续重写动画方法，我会遇到问题。

我应该遵循一些不同的方法来避免这个错误吗？

4

2 回答 2

0

原谅我狡猾的数学；但这应该有帮助！

<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>
于 2012-02-04T11:00:13.323 回答
0

我刚刚通过对代码的这个简单编辑解决了这个问题：

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();
    }
}

旧的：

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);
    }
}

这消除了错误行为。

于 2012-02-04T11:16:07.190 回答