| /* |
| title: Large Scale Candlestick |
| category: candlestick |
| titleCN: 大数据量K线图 |
| difficulty: 3 |
| */ |
| |
| var upColor = '#ec0000'; |
| var upBorderColor = '#8A0000'; |
| var downColor = '#00da3c'; |
| var downBorderColor = '#008F28'; |
| |
| var dataCount = 2e5; |
| var data = generateOHLC(dataCount); |
| |
| var option = { |
| dataset: { |
| source: data |
| }, |
| title: { |
| text: 'Data Amount: ' + echarts.format.addCommas(dataCount) |
| }, |
| tooltip: { |
| trigger: 'axis', |
| axisPointer: { |
| type: 'line' |
| } |
| }, |
| toolbox: { |
| feature: { |
| dataZoom: { |
| yAxisIndex: false |
| }, |
| } |
| }, |
| grid: [ |
| { |
| left: '10%', |
| right: '10%', |
| bottom: 200 |
| }, |
| { |
| left: '10%', |
| right: '10%', |
| height: 80, |
| bottom: 80 |
| } |
| ], |
| xAxis: [ |
| { |
| type: 'category', |
| scale: true, |
| boundaryGap: false, |
| // inverse: true, |
| axisLine: {onZero: false}, |
| splitLine: {show: false}, |
| splitNumber: 20, |
| min: 'dataMin', |
| max: 'dataMax' |
| }, |
| { |
| type: 'category', |
| gridIndex: 1, |
| scale: true, |
| boundaryGap: false, |
| axisLine: {onZero: false}, |
| axisTick: {show: false}, |
| splitLine: {show: false}, |
| axisLabel: {show: false}, |
| splitNumber: 20, |
| min: 'dataMin', |
| max: 'dataMax' |
| } |
| ], |
| yAxis: [ |
| { |
| scale: true, |
| splitArea: { |
| show: true |
| } |
| }, |
| { |
| scale: true, |
| gridIndex: 1, |
| splitNumber: 2, |
| axisLabel: {show: false}, |
| axisLine: {show: false}, |
| axisTick: {show: false}, |
| splitLine: {show: false} |
| } |
| ], |
| dataZoom: [ |
| { |
| type: 'inside', |
| xAxisIndex: [0, 1], |
| start: 10, |
| end: 100 |
| }, |
| { |
| show: true, |
| xAxisIndex: [0, 1], |
| type: 'slider', |
| bottom: 10, |
| start: 10, |
| end: 100 |
| } |
| ], |
| visualMap: { |
| show: false, |
| seriesIndex: 1, |
| dimension: 6, |
| pieces: [{ |
| value: 1, |
| color: upColor |
| }, { |
| value: -1, |
| color: downColor |
| }] |
| }, |
| series: [ |
| { |
| type: 'candlestick', |
| itemStyle: { |
| color: upColor, |
| color0: downColor, |
| borderColor: upBorderColor, |
| borderColor0: downBorderColor |
| }, |
| encode: { |
| x: 0, |
| y: [1, 4, 3, 2] |
| } |
| }, |
| { |
| name: 'Volumn', |
| type: 'bar', |
| xAxisIndex: 1, |
| yAxisIndex: 1, |
| itemStyle: { |
| color: '#7fbe9e' |
| }, |
| large: true, |
| encode: { |
| x: 0, |
| y: 5 |
| } |
| } |
| ] |
| }; |
| |
| function generateOHLC(count) { |
| var data = []; |
| |
| var xValue = +new Date(2011, 0, 1); |
| var minute = 60 * 1000; |
| var baseValue = Math.random() * 12000; |
| var boxVals = new Array(4); |
| var dayRange = 12; |
| |
| for (var i = 0; i < count; i++) { |
| baseValue = baseValue + Math.random() * 20 - 10; |
| |
| for (var j = 0; j < 4; j++) { |
| boxVals[j] = (Math.random() - 0.5) * dayRange + baseValue; |
| } |
| boxVals.sort(); |
| |
| var openIdx = Math.round(Math.random() * 3); |
| var closeIdx = Math.round(Math.random() * 2); |
| if (closeIdx === openIdx) { |
| closeIdx++; |
| } |
| var volumn = boxVals[3] * (1000 + Math.random() * 500); |
| |
| // ['open', 'close', 'lowest', 'highest', 'volumn'] |
| // [1, 4, 3, 2] |
| data[i] = [ |
| echarts.format.formatTime('yyyy-MM-dd\nhh:mm:ss', xValue += minute), |
| +boxVals[openIdx].toFixed(2), // open |
| +boxVals[3].toFixed(2), // highest |
| +boxVals[0].toFixed(2), // lowest |
| +boxVals[closeIdx].toFixed(2), // close |
| volumn.toFixed(0), |
| getSign(data, i, +boxVals[openIdx], +boxVals[closeIdx], 4) // sign |
| ]; |
| } |
| |
| return data; |
| |
| function getSign(data, dataIndex, openVal, closeVal, closeDimIdx) { |
| var sign; |
| if (openVal > closeVal) { |
| sign = -1; |
| } |
| else if (openVal < closeVal) { |
| sign = 1; |
| } |
| else { |
| sign = dataIndex > 0 |
| // If close === open, compare with close of last record |
| ? (data[dataIndex - 1][closeDimIdx] <= closeVal ? 1 : -1) |
| // No record of previous, set to be positive |
| : 1; |
| } |
| |
| return sign; |
| } |
| } |