47 lines
1.1 KiB
Go
47 lines
1.1 KiB
Go
package artist
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import "image/color"
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// Beveled is a pattern that has a highlight section and a shadow section.
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type Beveled [2]Pattern
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// AtWhen satisfies the Pattern interface.
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func (pattern Beveled) AtWhen (x, y, width, height int) (c color.RGBA) {
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return QuadBeveled {
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pattern[0],
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pattern[1],
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pattern[1],
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pattern[0],
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}.AtWhen(x, y, width, height)
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}
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// QuadBeveled is like Beveled, but with four sides. A pattern can be specified
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// for each one.
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type QuadBeveled [4]Pattern
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// AtWhen satisfies the Pattern interface.
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func (pattern QuadBeveled) AtWhen (x, y, width, height int) (c color.RGBA) {
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bottom := y > height / 2
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right := x > width / 2
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top := !bottom
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left := !right
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side := 0
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switch {
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case top && left:
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if x < y { side = 3 } else { side = 0 }
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case top && right:
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if width - x > y { side = 0 } else { side = 1 }
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case bottom && left:
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if x < height - y { side = 3 } else { side = 2 }
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case bottom && right:
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if width - x > height - y { side = 2 } else { side = 1 }
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}
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return pattern[side].AtWhen(x, y, width, height)
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}
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