DC sampler improvements

src/components/Chart.vue

@@ -100,8 +100,8 @@ export default {
             if (this._hook_xlocked) this.ce('?x-locked', state)
         },
         calc_interval() {
-            if (this.ohlcv.length < 2) return
             let tf = Utils.parse_tf(this.forced_tf)
+            if (this.ohlcv.length < 2 && !tf) return
             this.interval_ms = tf || Utils.detect_interval(this.ohlcv)
             this.interval = this.$props.ib ? 1 : this.interval_ms
             Utils.warn(

src/helpers/dc_core.js

@@ -190,12 +190,16 @@ export default class DCCore extends DCEvents {
         let tick = data['price']
         let volume = data['volume'] || 0
         let tf = this.tv.$refs.chart.interval_ms
-        let t_next = last[0] + tf
+        if (!tf) {
+            return console.warn('Define the main timeframe')
+        }
         let now = data.t || Utils.now()
+        if (!last) last = [now - now % tf]
+        let t_next = last[0] + tf
 
         let t = now >= t_next ? (now - now % tf) : last[0]
 
-        if (t >= t_next && tick !== undefined) {
+        if ((t >= t_next || !ohlcv.length) && tick !== undefined) {
             // And new zero-height candle
             let nc = [t, tick, tick, tick, tick, volume]
             this.agg.push('ohlcv', nc, tf)
@@ -484,7 +488,9 @@ export default class DCCore extends DCEvents {
 
     scroll_to(t) {
         if (this.tv.$refs.chart.cursor.locked) return
-        let tl = this.tv.$refs.chart.last_candle[0]
+        let last = this.tv.$refs.chart.last_candle
+        if (!last) return
+        let tl = last[0]
         let d = this.tv.getRange()[1] - tl
         if (d > 0) this.tv.goto(t + d)
     }

src/helpers/dc_events.js

@@ -282,7 +282,7 @@ export default class DCEvents {
     }
 
     set_loading(flag) {
-        let skrr = dc.get('.').filter(x => x.settings.$props)
+        let skrr = this.get('.').filter(x => x.settings.$props)
         for (var s of skrr) {
             this.merge(`${s.id}`, { loading: flag })
         }

test/tests/DataHelper/stream.js

@@ -13,7 +13,7 @@ export default function Stream(url) {
             data = JSON.parse(data.data)
             cb(data)
         } catch(e) {
-            console.log(e.toString())
+            console.log(e)
         }
     }