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Adds the ability to draw an XY scatter plot. (#27)

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* works more or less

* updating comment

* removing debugging printf

* adding output

* tweaks

* missed a couple series validations

* testing auto coloring

* updated output.png

* color tests etc.

* sanity check tests.

* should not use unkeyed fields anyway.
This commit is contained in:
Will Charczuk 2017-03-05 16:54:40 -08:00 • committed by GitHub
parent 17b28beae8
commit b713ff85cc
22 changed files with 511 additions and 72 deletions
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4
sma_series.go
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@ -50,7 +50,7 @@ func (sma SMASeries) GetPeriod(defaults ...int) int {
// GetValue gets a value at a given index.
func (sma SMASeries) GetValue(index int) (x, y float64) {
if sma.InnerSeries == nil {
if sma.InnerSeries == nil || sma.InnerSeries.Len() == 0 {
return
}
px, _ := sma.InnerSeries.GetValue(index)
@ -62,7 +62,7 @@ func (sma SMASeries) GetValue(index int) (x, y float64) {
// GetLastValue computes the last moving average value but walking back window size samples,
// and recomputing the last moving average chunk.
func (sma SMASeries) GetLastValue() (x, y float64) {
if sma.InnerSeries == nil {
if sma.InnerSeries == nil || sma.InnerSeries.Len() == 0 {
return
}
seriesLen := sma.InnerSeries.Len()