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<html>
    <head>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1" />
        <script src="lib/simpleRequire.js"></script>
        <script src="lib/config.js"></script>
        <script src="../dist/echarts.js"></script>
        <script src="lib/jquery.min.js"></script>
        <script src="lib/facePrint.js"></script>
        <script src="lib/testHelper.js"></script>
        <link rel="stylesheet" href="lib/reset.css" />
    </head>
    <body>
        <style>
        </style>


        <div id="main-cluster-step"></div>


        <script>

        require(['echarts', 'ecStat'], function (echarts, ecStat) {

            var originalData = [[3.275154, 2.957587], [-3.344465, 2.603513], [0.355083, -3.376585], [1.852435, 3.547351], [-2.078973, 2.552013], [-0.993756, -0.884433], [2.682252, 4.007573], [-3.087776, 2.878713], [-1.565978, -1.256985], [2.441611, 0.444826], [-0.659487, 3.111284], [-0.459601, -2.618005], [2.17768, 2.387793], [-2.920969, 2.917485], [-0.028814, -4.168078], [3.625746, 2.119041], [-3.912363, 1.325108], [-0.551694, -2.814223], [2.855808, 3.483301], [-3.594448, 2.856651], [0.421993, -2.372646], [1.650821, 3.407572], [-2.082902, 3.384412], [-0.718809, -2.492514], [4.513623, 3.841029], [-4.822011, 4.607049], [-0.656297, -1.449872], [1.919901, 4.439368], [-3.287749, 3.918836], [-1.576936, -2.977622], [3.598143, 1.97597], [-3.977329, 4.900932], [-1.79108, -2.184517], [3.914654, 3.559303], [-1.910108, 4.166946], [-1.226597, -3.317889], [1.148946, 3.345138], [-2.113864, 3.548172], [0.845762, -3.589788], [2.629062, 3.535831], [-1.640717, 2.990517], [-1.881012, -2.485405], [4.606999, 3.510312], [-4.366462, 4.023316], [0.765015, -3.00127], [3.121904, 2.173988], [-4.025139, 4.65231], [-0.559558, -3.840539], [4.376754, 4.863579], [-1.874308, 4.032237], [-0.089337, -3.026809], [3.997787, 2.518662], [-3.082978, 2.884822], [0.845235, -3.454465], [1.327224, 3.358778], [-2.889949, 3.596178], [-0.966018, -2.839827], [2.960769, 3.079555], [-3.275518, 1.577068], [0.639276, -3.41284]];
            var DIM_CLUSTER_INDEX = 2;
            var DATA_DIM_IDX = [0, 1];
            var CENTER_DIM_IDX = [3, 4];

            var step = ecStat.clustering.hierarchicalKMeans(originalData, {
                clusterCount: 6,
                outputType: 'single',
                outputClusterIndexDimension: DIM_CLUSTER_INDEX,
                outputCentroidDimensions: CENTER_DIM_IDX,
                stepByStep: true
            });

            var colorAll = [
                '#bbb', '#37A2DA', '#e06343', '#37a354', '#b55dba', '#b5bd48', '#8378EA', '#96BFFF'
            ];
            var ANIMATION_DURATION_UPDATE = 1500;

            function renderItemPoint(params, api) {
                var coord = api.coord([api.value(0), api.value(1)]);
                var clusterIdx = api.value(2);
                if (clusterIdx == null || isNaN(clusterIdx)) {
                    clusterIdx = 0;
                }
                var isNewCluster = clusterIdx === api.value(3);

                var extra = {
                    transition: []
                };

                var contentColor = colorAll[clusterIdx];
                // addColorTransition(extra, contentColor, 'content');

                return {
                    type: 'circle',
                    x: coord[0],
                    y: coord[1],
                    shape: {
                        cx: 0,
                        cy: 0,
                        r: 10
                    },
                    extra: extra,
                    style: {
                        fill: contentColor,
                        stroke: '#333',
                        lineWidth: 1,
                        shadowColor: contentColor,
                        shadowBlur: isNewCluster ? 12 : 0,
                        transition: ['shadowBlur', 'fill']
                    }
                };
            }

            function renderBoundary(params, api) {
                var xVal = api.value(0);
                var yVal = api.value(1);
                var maxDist = api.value(2);
                var center = api.coord([xVal, yVal]);
                var size = api.size([maxDist, maxDist]);
                var renderProgressStart;

                return {
                    type: 'ellipse',
                    shape: {
                        cx: isNaN(center[0]) ? 0 : center[0],
                        cy: isNaN(center[1]) ? 0 : center[1],
                        rx: isNaN(size[0]) ? 0 : size[0] + 15,
                        ry: isNaN(size[1]) ? 0 : size[1] + 15
                    },
                    extra: {
                        renderProgress: ++targetRenderProgress,
                        enterFrom: {
                            renderProgress: 0
                        },
                        transition: 'renderProgress'
                    },
                    style: {
                        fill: null,
                        stroke: 'rgba(0,0,0,0.2)',
                        lineDash: [4, 4],
                        lineWidth: 4
                    },
                    during: function (apiDuring) {
                        var currProgress = apiDuring.getExtra('renderProgress');
                        renderProgressStart == null && (renderProgressStart = currProgress);
                        var opacity = (currProgress - renderProgressStart)
                            / (targetRenderProgress - renderProgressStart);
                        apiDuring.setStyle('opacity', opacity);
                    }
                };
            }

            function makeStepOption(option, data, centroids) {
                var newCluIdx = centroids ? centroids.length - 1 : -1;
                var maxDist = 0;
                for (var i = 0; i < data.length; i++) {
                    var line = data[i];
                    if (line[DIM_CLUSTER_INDEX] === newCluIdx) {
                        var dist0 = Math.pow(line[DATA_DIM_IDX[0]] - line[CENTER_DIM_IDX[0]], 2);
                        var dist1 = Math.pow(line[DATA_DIM_IDX[1]] - line[CENTER_DIM_IDX[1]], 2);
                        maxDist = Math.max(maxDist, dist0 + dist1);
                    }
                }
                var boundaryData = centroids
                    ? [
                        [
                            centroids[newCluIdx][0],
                            centroids[newCluIdx][1],
                            Math.sqrt(maxDist)
                        ]
                    ]
                    : [];

                option.options.push({
                    series: [{
                        type: 'custom',
                        encode: {
                            tooltip: [0, 1]
                        },
                        renderItem: renderItemPoint,
                        data: data
                    }, {
                        type: 'custom',
                        renderItem: renderBoundary,
                        animationDuration: 3000,
                        silent: true,
                        data: boundaryData
                    }]
                });
            }

            var targetRenderProgress = 0;

            var option = {
                timeline: {
                    top: 'center',
                    right: 50,
                    height: 300,
                    width: 10,
                    inverse: true,
                    autoPlay: false,
                    playInterval: 2500,
                    symbol: 'none',
                    orient: 'vertical',
                    axisType: 'category',
                    label: {
                        formatter: 'step {value}',
                        position: 10
                    },
                    checkpointStyle: {
                        color: '#555',
                        borderWidth: 0,
                        animationDuration: ANIMATION_DURATION_UPDATE
                    },
                    data: []
                },
                baseOption: {
                    animationDurationUpdate: ANIMATION_DURATION_UPDATE,
                    tooltip: {
                    },
                    xAxis: {
                        type: 'value'
                    },
                    yAxis: {
                        type: 'value'
                    },
                    series: [{
                        type: 'scatter'
                    }]
                },
                options: []
            };

            makeStepOption(option, originalData);
            option.timeline.data.push('0');
            for (var i = 1, stepResult; !(stepResult = step.next()).isEnd; i++) {
                makeStepOption(
                    option,
                    echarts.util.clone(stepResult.data),
                    echarts.util.clone(stepResult.centroids)
                );
                option.timeline.data.push(i + '');
            }

            var chart = testHelper.create(echarts, 'main-cluster-step', {
                title: [
                    'Cluster algorithm visualization'
                ],
                height: 600,
                option: option
            });


        });

        </script>


    </body>
</html>