test/graph-label-rotate.html

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<html>
    <head>
        <meta charset="utf-8">
        <script src="lib/simpleRequire.js"></script>
        <script src="lib/config.js"></script>
        <script src="lib/jquery.min.js"></script>
        <script src="lib/dat.gui.min.js"></script>
    </head>
    <body>
        <style>
            html, body, #main {
                width: 100%;
                height: 100%;
                margin: 0;
            }
        </style>
        <div id="main"></div>
        <script>

            require([
                'echarts',

                'extension/dataTool',
                'theme/vintage'
            ], function (echarts, dataTool) {
                var gexf = dataTool.gexf;
                var chart = echarts.init(document.getElementById('main'), 'vintage', {

                });

                var option = {
                    title: {
                        text: 'Graph Label Rotate'
                    },
                    tooltip: {},
                    animationDurationUpdate: 1500,
                    animationEasingUpdate: 'quinticInOut',
                    series : [
                        {
                            type: 'graph',
                            layout: 'none',
                            symbolSize: 50,
                            roam: true,
                            label: {
                                show: true,
                                rotate: 30,
                                fontWeight:5,
                                fontSize: 26,
                                color: "#000",
                                distance: 15,
                                position: 'inside',
                                verticalAlign: 'middle'
                            },
                            edgeSymbol: ['circle', 'arrow'],
                            edgeSymbolSize: [4, 10],
                            edgeLabel: {
                                normal: {
                                    textStyle: {
                                        fontSize: 20
                                    }
                                }
                            },
                            data: [{
                                name: 'rotate 30',
                                x: 300,
                                y: 300
                            }, {
                                name: 'rotate 45',
                                x: 500,
                                y: 600,
                                label: {
                                    rotate: -30
                                }
                            }],
                            emphasis: {
                                label: {
                                    rotate: 45
                                }
                            }
                        }
                    ]
                }

                chart.setOption(option);

            });
        </script>
    </body>
</html>