fix: #287 Compare page

src/views/Compare/Dashboard/index.vue

@@ -406,8 +406,8 @@ export default {
           };
           primeVueSetOption.scales.x.min = minX;
           primeVueSetOption.scales.x.max = maxX;
-          const {resultStepSize: YTickStepSize, unitToUse} = getStepSizeOfYTicks(maxY); // Stepsize only needs to be calculated once
           primeVueSetOption.scales.y.ticks.callback = function (value, index, ticks) {
+            const {resultStepSize: YTickStepSize, unitToUse} = getStepSizeOfYTicks(maxY, ticks.length); // Stepsize only needs to be calculated once
             return getYTicksByIndex(YTickStepSize, index, unitToUse); 
           }
           break;
@@ -738,6 +738,178 @@ export default {
           },
       };       
     },
+    /**
+     * 建立Compare頁面的折線圖，並且避免同一個畫面中的設定值彼此覆蓋
+     * @param { object } chartData chart data
+     * @param { object } content titels 標題文字
+     * @param { string } yUnit y 軸單位 'date' | 'count'，可傳入以上任一。
+     * @returns { [primeVueSetData, primeVueSetOption] } 這兩者為符合 primeVue 圖表格式的數據資料
+     */
+     getLineChart(chartData, content, yUnit) {
+      let datasetsPrimary;
+      let datasetsSecondary;
+      let minX = chartData.x_axis.min;
+      let maxX = chartData.x_axis.max;
+      let maxY = chartData.y_axis.max;
+      let xLabelData;
+      let labelPrimary = chartData.data[0].label;
+      let labelSecondary = chartData.data[1].label;
+      let primeVueSetData = {};
+      let primeVueSetOption = {};
+      const getMoment = (time)=> {
+        return this.$moment(time).format('YYYY/M/D hh:mm:ss')
+      };
+      const getSimpleTimeLabel = simpleTimeLabel;
+      const getFollowTimeLabel = followTimeLabel;
+
+      // fabricate x label according to y unit
+      switch (yUnit) {
+        case 'date':
+          datasetsPrimary = setLineChartData(chartData.data[0].data, chartData.x_axis.max, chartData.x_axis.min, false,
+          chartData.y_axis.max, chartData.y_axis.min);
+          datasetsSecondary = setLineChartData(chartData.data[1].data, chartData.x_axis.max, chartData.x_axis.min, false,
+          chartData.y_axis.max, chartData.y_axis.min);
+          xLabelData = this.setXLabelsData(chartData.x_axis);
+          break;
+        case 'count': // 次數 10 個點
+          datasetsPrimary = chartData.data[0].data;
+          datasetsSecondary = chartData.data[1].data;
+          xLabelData = chartData.data[0].data.map(item => new Date(item.x).getTime());
+          break;
+      }
+
+      // Customize X axis ticks due to different differences between min and max of data group
+      // Compare page and Performance page share the same logic
+      const formatToSet = setTimeStringFormatBaseOnTimeDifference(minX, maxX);
+      const ticksOfXAxis = mapTimestampToAxisTicksByFormat(xLabelData, formatToSet);
+
+      primeVueSetData = {
+        labels: xLabelData,
+        datasets: [
+          {
+            label: labelPrimary,
+            data: datasetsPrimary,
+            fill: false,
+            tension: 0, // 貝茲曲線張力
+            borderColor: this.colorPrimary,
+            pointBackgroundColor: this.colorPrimary,
+          },
+          {
+            label: labelSecondary,
+            data: datasetsSecondary,
+            fill: false,
+            tension: 0, // 貝茲曲線張力
+            borderColor: this.colorSecondary,
+            pointBackgroundColor: this.colorSecondary,
+          }
+        ]
+      };
+      primeVueSetOption = {
+        responsive: true,
+        maintainAspectRatio: false,
+        layout: {
+          padding: {
+            top: 16,
+            left: 8,
+            right: 8,
+          }
+        },
+        plugins: {
+          legend: false, // 圖例
+          tooltip: {
+            // displayColors: false,
+            mode: 'index',
+            titleFont: {weight: 'normal'},
+            callbacks: {
+              title: function(context) {
+                return `${content.x}: ${getMoment(context[0].parsed.x)}`;
+              },
+            },
+          },
+          title: {
+            display: false,
+          },
+        },
+        scales:  {
+          x: {
+            min: minX,
+            max: maxX,
+            type: 'time',
+            title: {
+              display: true,
+              color: '#334155',
+              font: {
+                size: 12,
+                lineHeight: 2
+              },
+              text: content.x,              
+            },
+            time: {
+              displayFormats: {
+                second: 'h:mm:ss', // ex: 1:11:11
+                minute: 'M/d h:mm', // ex: 1/1 1:11
+                hour: 'M/d h:mm', // ex: 1/1 1:11
+                day: 'M/d h', // ex: 1/1 1
+                month: 'y/M/d', // ex: 1911/1/1
+              },
+              round: true
+            },
+            ticks: {
+              padding: 8,
+              display: true,
+              maxRotation: 0, // 不旋轉 lable 0~50
+              color: '#64748b',
+              source: 'labels', // 依比例彈性顯示 label 數量
+              callback: function(value, index) {
+                return ticksOfXAxis[index];
+              },
+            },
+            border: {
+              color: '#64748b',
+            },
+          },
+          y: {
+            beginAtZero: true, // scale 包含 0
+            title: {
+              display: true,
+              color: '#334155',
+              font: {
+                size: 12,
+                lineHeight: 2
+              },
+              text: content.y
+            },
+            grid: {
+              color: '#64748b',
+            },
+            border: {
+              display: false, // 隱藏左側多出來的線
+            },
+            ticks: {
+              
+              color: '#64748b',
+              padding: 8,
+              callback: function (value, index, ticks) {
+                // resultStepSize: Y 軸一個刻度的高度的純數值部分，unitToUse則可能是 d,h,m,s 四者之一
+                const {resultStepSize, unitToUse} = getStepSizeOfYTicks(maxY, ticks.length);
+                return getYTicksByIndex(resultStepSize, index, unitToUse);
+              },
+            }
+          },
+        },
+        plugins: {
+          tooltip: {
+            callbacks:{
+              label:function(context) {
+                return `${content.y}: ${getSimpleTimeLabel(context.parsed.y, 2)}`;
+              },
+            },
+          },
+        },
+      };
+
+      return [primeVueSetData, primeVueSetOption];
+    },
   },
   async created() {
     this.isLoading = true; // moubeted 才停止 loading