ECharts-gl中三维图片旋转问题

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ECharts-gl中三维图片旋转问题

一开始用ECharts-gl库进行绘图的时候很多东西不是很熟，下面我稍微讲解下如何对三维图片进行旋转的操作以及代码的附上，有兴趣的读者可以自行测试。
主程序代码：

<div id='main' style="position: absolute;width: 80%;height: 80%;"></div>
//基于准备好的dom，初始化echarts实例
var myChart = echarts.init(document.getElementById('main'));
var hours = ['12a', '1a', '2a', '3a', '4a', '5a', '6a',
'7a', '8a', '9a','10a','11a',
'12p', '1p', '2p', '3p', '4p', '5p',
'6p', '7p', '8p', '9p', '10p', '11p'];
var days = ['Saturday', 'Friday', 'Thursday',
'Wednesday', 'Tuesday', 'Monday', 'Sunday'];

var data = [[0,0,5],[0,1,1],[0,2,0],[0,3,0],[0,4,0],[0,5,0],[0,6,0],[0,7,0],[0,8,0],[0,9,0],[0,10,0],[0,11,2],[0,12,4],[0,13,1],[0,14,1],[0,15,3],[0,16,4],[0,17,6],[0,18,4],[0,19,4],[0,20,3],[0,21,3],[0,22,2],[0,23,5],[1,0,7],[1,1,0],[1,2,0],[1,3,0],[1,4,0],[1,5,0],[1,6,0],[1,7,0],[1,8,0],[1,9,0],[1,10,5],[1,11,2],[1,12,2],[1,13,6],[1,14,9],[1,15,11],[1,16,6],[1,17,7],[1,18,8],[1,19,12],[1,20,5],[1,21,5],[1,22,7],[1,23,2],[2,0,1],[2,1,1],[2,2,0],[2,3,0],[2,4,0],[2,5,0],[2,6,0],[2,7,0],[2,8,0],[2,9,0],[2,10,3],[2,11,2],[2,12,1],[2,13,9],[2,14,8],[2,15,10],[2,16,6],[2,17,5],[2,18,5],[2,19,5],[2,20,7],[2,21,4],[2,22,2],[2,23,4],[3,0,7],[3,1,3],[3,2,0],[3,3,0],[3,4,0],[3,5,0],[3,6,0],[3,7,0],[3,8,1],[3,9,0],[3,10,5],[3,11,4],[3,12,7],[3,13,14],[3,14,13],[3,15,12],[3,16,9],[3,17,5],[3,18,5],[3,19,10],[3,20,6],[3,21,4],[3,22,4],[3,23,1],[4,0,1],[4,1,3],[4,2,0],[4,3,0],[4,4,0],[4,5,1],[4,6,0],[4,7,0],[4,8,0],[4,9,2],[4,10,4],[4,11,4],[4,12,2],[4,13,4],[4,14,4],[4,15,14],[4,16,12],[4,17,1],[4,18,8],[4,19,5],[4,20,3],[4,21,7],[4,22,3],[4,23,0],[5,0,2],[5,1,1],[5,2,0],[5,3,3],[5,4,0],[5,5,0],[5,6,0],[5,7,0],[5,8,2],[5,9,0],[5,10,4],[5,11,1],[5,12,5],[5,13,10],[5,14,5],[5,15,7],[5,16,11],[5,17,6],[5,18,0],[5,19,5],[5,20,3],[5,21,4],[5,22,2],[5,23,0],[6,0,1],[6,1,0],[6,2,0],[6,3,0],[6,4,0],[6,5,0],[6,6,0],[6,7,0],[6,8,0],[6,9,0],[6,10,1],[6,11,0],[6,12,2],[6,13,1],[6,14,3],[6,15,4],[6,16,0],[6,17,0],[6,18,0],[6,19,0],[6,20,1],[6,21,2],[6,22,2],[6,23,6]];
option = {
tooltip: {},
visualMap: {
max: 20,
inRange: {
color: ['#313695', '#4575b4', '#74add1', '#abd9e9', '#e0f3f8', '#ffffbf', '#fee090', '#fdae61', '#f46d43', '#d73027', '#a50026']
}
},
xAxis3D: {
type: 'category',
data: hours
},
yAxis3D: {
type: 'category',
data: days
},
zAxis3D: {
type: 'value'
},
grid3D: {
boxWidth: 200,
boxDepth: 80,
light: {
main: {
intensity: 1.2
},
ambient: {
intensity: 0.3
}
}
},
series: [{
type: 'bar3D',
data: data.map(function (item) {
return {
value: [item[1], item[0], item[2]]
}
}),
shading: 'color',

label: {
show: false,
textStyle: {
fontSize: 16,
borderWidth: 1
}
},

itemStyle: {
opacity: 0.4
},

emphasis: {
label: {
textStyle: {
fontSize: 20,
color: '#900'
}
},
itemStyle: {
color: '#900'
}

}
}]
}
// 使用刚指定的配置项和数据显示图表。
myChart.setOption(option);

直接运行代码，你将得到一个三维柱形图（图片就不附上了），那么接下来我们如何进行旋转呢？

首先，对于旋转我们要清晰两个概念①alpha：上下旋转角度，视角绕x轴旋转，针对上下视角；②beta：左右旋转角度，视角绕y轴旋转，针对左右视角。所以我们最终要进行的操作就是alpha和beta两个值，同时在ECharts-gl中也是有定义。下面来看看代码。

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