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painter.go: Optimize isTick function

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This reduces the loop frequency to one or two iterations in all cases.
I have been unable to find any single line equation that can produce this same behavior, but one likely exists.
This commit is contained in:
Mike Jensen 2023-05-04 17:59:11 -06:00
parent e7a49c2c21
commit 19173dfd37
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1 changed files with 5 additions and 3 deletions
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painter.go
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@ -617,10 +617,12 @@ func (p *Painter) TextFit(body string, x, y, width int, textAligns ...string) ch
func isTick(totalRange int, numTicks int, index int) bool { func isTick(totalRange int, numTicks int, index int) bool {
step := float64(totalRange-1) / float64(numTicks-1) step := float64(totalRange-1) / float64(numTicks-1)
for i := 0; i < numTicks; i++ { for i := int(float64(index) / step); i < numTicks; i++ {
value := float64(i) * step value := int((float64(i) * step) + 0.5)
if int(value + 0.5) == index { if value == index {
return true return true
} else if value > index {
break
} }
} }
return false return false