性能kineticjs慢(Performance slow with kineticjs)

很抱歉，如果这个问题被问了，我已经试过用不能找到它。

我有一个画布应该最终400-500矩形20-30像素的高度/宽度。他们每个人都应该对鼠标和背部鼠标向左移动一个像素和高达了创建某种选择的行为。现在，我的代码的伟大工程，具有形状量小，但对他们的500它开始显着放缓。从互联网上的一些例子中，我看到了，我可以创造“动画层”和移动，我需要有动画的对象。但是，这仍然需要我重新绘制主层从它原来的位置......下面的代码删除移动的项目：

var seatMap = {};

seatMap.seatTypes = {
    economy: {
        width: 20,
        height: 20,
        fill: 'red',
        stroke: 'black',
        strokeWidth: 4,
        cornerRadius: 5
    },
    business: {
        width: 22,
        height: 22,
        fill: 'red',
        stroke: 'black',
        strokeWidth: 4,
        cornerRadius: 5
    },
    first: {
        width: 25,
        height: 25,
        fill: 'red',
        stroke: 'black',
        strokeWidth: 4,
        cornerRadius: 5
    }
};

seatMap.Map = function (params) {
    var stage = new Kinetic.Stage({
        container: params.container,
        width: params.width,
        height: params.height
    });

    var mainLayer = new Kinetic.Layer();
    var animationLayer = new Kinetic.Layer();

    stage.add(mainLayer);
    stage.add(animationLayer);

    var addSeat = function (object) {
        object.seat.mainLayerRef = mainLayer;
        object.seat.animationLayerRef = animationLayer;

        mainLayer.add(object.seat);
    };

    var refresh = function () {
        mainLayer.draw();
    }

    return {
        refresh: refresh,
        addSeat: addSeat
    }
}

seatMap.Seat = function (params) {

    var seatType = params.seatType == null ? seatMap.seatTypes.economy : params.seatType;

    var seat = new Kinetic.Rect({
        width: seatType.width,
        height: seatType.height,
        x: params.x,
        y: params.y,
        fill: seatType.fill,
        stroke: seatType.stroke,
        strokewidth: seatType.strokewidth,
        cornerRadius: seatType.cornerRadius,
        listening: true
    });
    seat.staticXPosition = params.x;
    seat.staticYPosition = params.y;

    seat.on('mouseover', function (event) {
        event.shape.moveTo(event.shape.animationLayerRef);
        event.shape.setX(event.shape.staticXPosition - 2);
        event.shape.setY(event.shape.staticYPosition - 2);
        event.shape.animationLayerRef.draw();
        event.shape.mainLayerRef.draw();
    });
    seat.on('mouseout', function (event) {
        event.shape.setX(event.shape.staticXPosition);
        event.shape.setY(event.shape.staticYPosition);
        event.shape.moveTo(event.shape.mainLayerRef);
        event.shape.animationLayerRef.draw();
        event.shape.mainLayerRef.draw();
    });

    return {
        seat: seat,
    }
}

和代码呈现在画布上：

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
    <script type="text/javascript" src="scripts/jquery-1.8.0.js"></script>
    <script type="text/javascript" src="scripts/kinetic-v3.10.5.min.js"></script>
    <script type="text/javascript" src="scripts/local/seatMapKineticExtender.js"></script>
    <!--<script type="text/javascript" src="scripts/local/app.js"></script>-->
    <script>
        $(function () {
            var map = new seatMap.Map({
                container: 'stage',
                width: 1000,
                height: 420
            });

            for (var i = 0; i < 800; i += 30) {
                for (var j = 0; j < 500; j+=30) {
                    var seat = new seatMap.Seat({
                        seatType: seatMap.seatTypes.business,
                        x: i,
                        y: j
                    });
                    map.addSeat(seat);
                }
            }
            //var seat = new seatMap.Seat({
            //    seatType: seatMap.seatTypes.business,
            //    x: 200,
            //    y: 200
            //});

            //map.addSeat(seat);
            map.refresh();
        });
    </script>
</head>
<body>
    <div id="stage" style="width: 1000px; height: 420px; margin: 0 auto; border: 1px solid black; position: relative">
        <div style="position: absolute; top: 0; z-index: 1000">
            <button id="zoomIn" type="button">Zoom In</button>
            <button id="zoomOut" type="button">Zoom Out</button>
        </div>

    </div>
</body>
</html>

我觉得我做一些大错，但不幸的是我不熟悉不够kineticjs。任何人都可以点我朝着正确的方向？

在此先感谢，丹尼

Answer 1:

好吧，这是一个很好的挑战。我认为这个问题是在形状事件，但改善有过如此之小。

在KineticJS该事件通过模型的坐标搜索，直到一个当前鼠标的坐标匹配应用到特定的屏幕的形状。因此，通过仅具有一个层，我们增加数组的大小进行搜索。

解决方法是用很多层。我加了一个层的每一行。

一些在下面的代码中的其他变化是：

不要层之间移动的形状。它会导致阵列剪接和索引移位。
使用相对move(x,y)的方法，而不是setX() setY()为较小的变化的方法。
你在一个教程读取的动画层概念用于在定时帧间隔做实际的动画。我们只是在做对事件的正常形状的举动。
JS轻微改善; 当返回一个对象来隐藏私有数据和方法，不使用new创建的对象。

页

<script>
    $(function () {
        var map = seatMap.Map({
            container: 'stage',
            width: 1000,
            height: 420
        });

        for (var i = 0; i < 800; i += 30) {
            var layer = map.createLayer();
            for (var j = 0; j < 500; j+=30) {
                var seat = seatMap.Seat({
                    seatType: seatMap.seatTypes.business,
                    x: i,
                    y: j
                });
                map.addSeat(seat, layer);
            }
            layer.draw();
        }
        //var seat = new seatMap.Seat({
        //    seatType: seatMap.seatTypes.business,
        //    x: 200,
        //    y: 200
        //});

        //map.addSeat(seat);
        map.refresh();
    });
</script>

码

seatMap.Map = function (params) {
var stage = new Kinetic.Stage({
    container: params.container,
    width: params.width,
    height: params.height
});

var addSeat = function (object, layer) {
    object.seat.layer = layer;
    layer.add(object.seat);     
};

var refresh = function () {
    mainLayer.draw();
};

var createLayer = function() {
    var layer = new Kinetic.Layer();
    stage.add(layer);
    return layer;
};
return {
    createLayer : createLayer,
    refresh: refresh,
    addSeat: addSeat
};
}

seatMap.Seat = function (params) {

var seatType = params.seatType == null ? seatMap.seatTypes.economy : params.seatType;

var seat = new Kinetic.Rect({
    width: seatType.width,
    height: seatType.height,
    x: params.x,
    y: params.y,
    fill: seatType.fill,
    stroke: seatType.stroke,
    strokewidth: seatType.strokewidth,
    cornerRadius: seatType.cornerRadius,
    listening: true
});
seat.staticXPosition = params.x;
seat.staticYPosition = params.y;

seat.on('mouseover', function (event) {
    event.shape.move(-3,-3);
    event.shape.layer.draw();
});
seat.on('mouseout', function (event) {

    event.shape.move(3,3);
    event.shape.layer.draw();
});

return {
    seat: seat,
};
}