44 lines
1007 B
Go
44 lines
1007 B
Go
package artist
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import "image/color"
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// Orientation specifies an eight-way pattern orientation.
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type Orientation int
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const (
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OrientationVertical Orientation = iota
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OrientationDiagonalRight
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OrientationHorizontal
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OrientationDiagonalLeft
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)
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// Split is a pattern that is divided in half between two sub-patterns.
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type Split struct {
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First Pattern
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Second Pattern
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Orientation
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}
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// AtWhen satisfies the Pattern interface.
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func (pattern Split) AtWhen (x, y, width, height int) (c color.RGBA) {
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var first bool
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switch pattern.Orientation {
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case OrientationVertical:
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first = x < width / 2
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case OrientationDiagonalRight:
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first = float64(x) / float64(width) +
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float64(y) / float64(height) < 1
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case OrientationHorizontal:
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first = y < height / 2
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case OrientationDiagonalLeft:
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first = float64(width - x) / float64(width) +
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float64(y) / float64(height) < 1
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}
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if first {
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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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}
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}
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