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tomo-old/artist/split.go

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2023-01-20 21:19:54 -07:00
package artist
import "image/color"
// Orientation specifies an eight-way pattern orientation.
type Orientation int
const (
OrientationVertical Orientation = iota
OrientationDiagonalRight
OrientationHorizontal
OrientationDiagonalLeft
)
// Split is a pattern that is divided in half between two sub-patterns.
type Split struct {
First Pattern
Second Pattern
Orientation
}
// AtWhen satisfies the Pattern interface.
func (pattern Split) AtWhen (x, y, width, height int) (c color.RGBA) {
var first bool
switch pattern.Orientation {
case OrientationVertical:
first = x < width / 2
case OrientationDiagonalRight:
first = float64(x) / float64(width) +
float64(y) / float64(height) < 1
case OrientationHorizontal:
first = y < height / 2
case OrientationDiagonalLeft:
first = float64(width - x) / float64(width) +
float64(y) / float64(height) < 1
}
if first {
return pattern.First.AtWhen(x, y, width, height)
} else {
return pattern.Second.AtWhen(x, y, width, height)
}
}