go-chart/tick.go
2016-07-13 11:50:22 -07:00

44 lines
912 B
Go

package chart
// GenerateTicksWithStep generates a set of ticks.
func GenerateTicksWithStep(ra Range, step float64, vf ValueFormatter) []Tick {
var ticks []Tick
min, max := ra.Min, ra.Max
for cursor := min; cursor <= max; cursor += step {
ticks = append(ticks, Tick{
Value: cursor,
Label: vf(cursor),
})
// this guard is in place in case step is super, super small.
if len(ticks) > DefaultTickCountSanityCheck {
return ticks
}
}
return ticks
}
// Tick represents a label on an axis.
type Tick struct {
Value float64
Label string
}
// Ticks is an array of ticks.
type Ticks []Tick
// Len returns the length of the ticks set.
func (t Ticks) Len() int {
return len(t)
}
// Swap swaps two elements.
func (t Ticks) Swap(i, j int) {
t[i], t[j] = t[j], t[i]
}
// Less returns if i's value is less than j's value.
func (t Ticks) Less(i, j int) bool {
return t[i].Value < t[j].Value
}