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tomo-old/artist/striped.go

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package artist
import "image/color"
// Striped is a pattern that produces stripes of two alternating colors.
type Striped struct {
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First Stroke
Second Stroke
Orientation
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}
// AtWhen satisfies the Pattern interface.
func (pattern Striped) AtWhen (x, y, width, height int) (c color.RGBA) {
position := 0
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switch pattern.Orientation {
case OrientationVertical:
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position = x
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case OrientationDiagonalRight:
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position = x + y
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case OrientationHorizontal:
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position = y
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case OrientationDiagonalLeft:
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position = x - y
}
phase := pattern.First.Weight + pattern.Second.Weight
position %= phase
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if position < 0 {
position += phase
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}
if position < pattern.First.Weight {
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return pattern.First.AtWhen(x, y, width, height)
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} else {
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return pattern.Second.AtWhen(x, y, width, height)
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}
}