22 lines
1.1 KiB
Go
22 lines
1.1 KiB
Go
package influxql
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// linearFloat computes the the slope of the line between the points (previousTime, previousValue) and (nextTime, nextValue)
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// and returns the value of the point on the line with time windowTime
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// y = mx + b
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func linearFloat(windowTime, previousTime, nextTime int64, previousValue, nextValue float64) float64 {
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m := (nextValue - previousValue) / float64(nextTime-previousTime) // the slope of the line
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x := float64(windowTime - previousTime) // how far into the interval we are
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b := previousValue
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return m*x + b
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}
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// linearInteger computes the the slope of the line between the points (previousTime, previousValue) and (nextTime, nextValue)
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// and returns the value of the point on the line with time windowTime
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// y = mx + b
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func linearInteger(windowTime, previousTime, nextTime int64, previousValue, nextValue int64) int64 {
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m := float64(nextValue-previousValue) / float64(nextTime-previousTime) // the slope of the line
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x := float64(windowTime - previousTime) // how far into the interval we are
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b := float64(previousValue)
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return int64(m*x + b)
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}
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