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javascript – kineticjs表现缓慢

2019-10-07 01:36:51 作者：互联网

对不起,如果已经提出这个问题,我试图找不到它.

我有一个画布,最终应该显示大约400-500个矩形20-30像素的高度/宽度.它们中的每一个都应该在鼠标移开时向上和向后移动一个像素,以创建一些选定的行为.
现在,我的代码在少量形状下工作得很好,但是对于其中的500个,它开始显着减慢.
从互联网上的一些例子中我看到我可以创建“动画层”并移动我需要在那里制作动画的对象.但是,这仍然需要我重绘主图层以从之前的位置移除移动的项目…
这是代码：

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,
    }
}

以及呈现画布的代码：

<!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>

我觉得我在这里做了一些非常错误的事情,但不幸的是,我对kineticjs并不熟悉.
有人能指出我正确的方向吗？

提前致谢,
丹尼

解决方法:

好吧,这是一个很好的挑战.我认为问题出在形状事件中,但那里的改进是如此之小.

通过搜索模型的坐标直到一个匹配当前的鼠标坐标,将KineticJS中的事件应用于特定的屏幕形状.因此,通过只有一个图层,我们增加要搜索的数组的大小.

修复是使用多个层.我为每一行添加了一个图层.

以下代码中的一些其他更改包括：

>不要在图层之间移动形状.它会导致数组拼接和索引转换.
>对于小班次,使用相对移动(x,y)方法而不是setX()setY()方法.
>您在教程中阅读的动画层概念用于在定时帧间隔上执行实际动画.我们正在对事件进行正常的形状移动.
>小JS改进;返回对象以隐藏私有数据和方法时,请勿使用new来创建对象.

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,
};
}

标签：kineticjs,javascript,canvas
来源： https://codeday.me/bug/20191007/1863752.html