动态改样式

使用PointSimplifier结合动画展示不同样式下的海量点效果。

源代码编辑器
<!-- 重点：getRenderOptions -->
<!doctype html>
<html lang="zh-CN">

<head>
    <!-- 原始地址：//webapi.amap.com/ui/1.1/ui/misc/PointSimplifier/examples/animation.html -->
    <base href="//webapi.amap.com/ui/1.1/ui/misc/PointSimplifier/examples/" />
    <meta charset="utf-8">
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
    <title>动态改样式</title>
    <style>
    html,
    body,
    #container {
        width: 100%;
        height: 100%;
        margin: 0px;
    }
    
    #loadingTip {
        position: absolute;
        z-index: 9999;
        top: 0;
        right: 0;
        padding: 3px 10px;
        background: red;
        color: #fff;
        font-size: 13px;
    }
    </style>
</head>

<body>
    <div id="container"></div>
    <script type="text/javascript" src='//webapi.amap.com/maps?v=2.0&key=您申请的key值'></script>
    <!-- UI组件库 1.0 -->
    <script src="//webapi.amap.com/ui/1.1/main.js?v=1.1.1"></script>
    <script type="text/javascript">
    //创建地图
    var map = new AMap.Map('container', {
        zoom: 4
    });

    //just some colors
    var colors = [
        "#3366cc", "#dc3912", "#ff9900", "#109618", "#990099", "#0099c6", "#dd4477", "#66aa00",
        "#b82e2e", "#316395", "#994499", "#22aa99", "#aaaa11", "#6633cc", "#e67300", "#8b0707",
        "#651067", "#329262", "#5574a6", "#3b3eac"
    ];


    AMapUI.load(['ui/misc/PointSimplifier', 'lib/$'], function(PointSimplifier, $) {

        if (!PointSimplifier.supportCanvas) {
            alert('当前环境不支持 Canvas！');
            return;
        }

        var pointSimplifierIns = new PointSimplifier({
            zIndex: 115,
            autoSetFitView: false,
            map: map, //所属的地图实例

            getPosition: function(item) {
                if (!item) {
                    return null;
                }

                var parts = item.split(',');

                return [parseFloat(parts[0]), parseFloat(parts[1])];
            },
            getHoverTitle: function(dataItem, idx) {
                return '序号: ' + idx;
            },
            //使用GroupStyleRender
            renderConstructor: PointSimplifier.Render.Canvas.GroupStyleRender,
            renderOptions: {
                //点的样式
                pointStyle: {
                    fillStyle: 'red',
                    width: 5,
                    height: 5
                },
                getGroupId: function(item, idx) {

                    var parts = item.split(',');

                    //按纬度区间分组
                    return Math.abs(Math.round(parseFloat(parts[1]) / 3));
                },
                groupStyleOptions: function(gid) {

                    return {
                        pointStyle: {
                            fillStyle: colors[gid % colors.length]
                        }
                    };
                }

            }
        });

        function startAnim() {

            var renderOptions = pointSimplifierIns.getRenderOptions();

            //获得pointStyle
            var pointStyle = renderOptions.pointStyle;

            var size = pointStyle.width,
                range = [2, 10],
                step = size < range[1] ? 1 : -1;

            //pointSimplifierIns.getRender().getLayer().set('alwaysRender', true);

            function anim() {

                size += step;

                //修改pointStyle
                pointStyle.width = pointStyle.height = size;

                //重新绘制
                pointSimplifierIns.render();

                if (size >= range[1]) {
                    step = -1;
                } else if (size <= range[0]) {
                    step = 1;
                }

                //window.requestAnimationFrame(anim);
                //
                setTimeout(anim, 100);
            }

            anim();
        }


        $('<div id="loadingTip">加载数据，请稍候...</div>').appendTo(document.body);
        $.get('http://a.amap.com/amap-ui/static/data/10w.txt', function(csv) {

            var data = csv.split('\n');

            pointSimplifierIns.setData(data);

            $('#loadingTip').remove();

            startAnim();
        });
    });
    </script>
</body>

</html>
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