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Luis Fernando Molina committed 2018-03-03 12:24:50 +01:00
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commit 6d7da20eb1
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.vs/AAWebPlatform/v15/.suo
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ChartUtilities.js
-95
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@@ -148,98 +148,3 @@ function recalculatePeriod(zoomLevel) {
return ONE_DAY_IN_MILISECONDS;
}
}
function checkIfMoreTradesAreNeeded(trades, container, timeLineCoordinateSystem, marketTrades, callBackFunction) {
/*
To know when to load more trades, we will see were the first candle is in relation to the viewport.
If we are too close to the visible area, we will request more trades, so as to have more candles ready.
If we are to far, we will request a new set of trades with fewer than the ones we have, so as to have les candles.
*/
let firstTrade = trades[0];
let lastTrade = trades[trades.length - 1];
let firstTradePoint = {
x: firstTrade.datetime.valueOf(),
y: 0
};
let lastTradePoint = {
x: lastTrade.datetime.valueOf(),
y: 0
};
firstTradePoint = timeLineCoordinateSystem.inverseTransform(firstTradePoint, container.frame.height);
firstTradePoint = transformThisPoint(firstTradePoint, container);
lastTradePoint = timeLineCoordinateSystem.inverseTransform(lastTradePoint, container.frame.height);
lastTradePoint = transformThisPoint(lastTradePoint, container);
let totalDistance = lastTradePoint.x - firstTradePoint.x; // Is the screen distance between the first and last trade.
let tradesDistance = lastTrade.id - firstTrade.id; // It is the distance in Id between the first and last trade.
let viewPortWidth = viewPort.visibleArea.bottomRight.x - viewPort.visibleArea.bottomLeft.x;
/*
Knowing the distance in the screen and the distance in Ids from the first and last trade, can leads us to know the distance in ids, from
where the first trade is, to where it should be.
To do that we will first calculate how many trades are currently fitting in the viewport.
*/
let viewPortTrades = Math.round(viewPortWidth * tradesDistance / totalDistance);
let estimatedFisrtTradeId = firstTrade.id;
let estimatedLastTradeId = lastTrade.id;
let needToRequestMoreTrades = false;
if (firstTradePoint.x > viewPort.visibleArea.bottomLeft.x - viewPortWidth) {
/* We need more trades before the first one. The first trade should be less than 2 times the view port width. Lets estimate an Id for a trade just there. */
estimatedFisrtTradeId = firstTrade.id - viewPortTrades;
needToRequestMoreTrades = true;
}
if (firstTradePoint.x < viewPort.visibleArea.bottomLeft.x - viewPortWidth * 2) {
/* We need more get rid of some trades after the first one. */
estimatedFisrtTradeId = firstTrade.id + viewPortTrades;
needToRequestMoreTrades = true;
}
if (lastTradePoint.x < viewPort.visibleArea.bottomRight.x + viewPortWidth) {
/* We need more trades after the last one. */
estimatedLastTradeId = lastTrade.id + viewPortTrades;
needToRequestMoreTrades = true;
}
if (lastTradePoint.x > viewPort.visibleArea.bottomRight.x + viewPortWidth * 2) {
/* We need more get rid of some trades before the last one. */
estimatedLastTradeId = lastTrade.id - viewPortTrades;
needToRequestMoreTrades = true;
}
if (needToRequestMoreTrades === true) {
marketTrades.getTradesById(estimatedFisrtTradeId, estimatedLastTradeId, callBackFunction);
}
}