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tomo-old/artist/chisel.go

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package artist
import "image/color"
// Chiseled is a pattern that has a highlight section and a shadow section.
type Chiseled struct {
Highlight Pattern
Shadow Pattern
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}
// AtWhen satisfies the Pattern interface.
func (chiseled Chiseled) AtWhen (x, y, width, height int) (c color.RGBA) {
var highlighted bool
// FIXME: this doesn't work quite right, the
// slope of the line is somewhat off.
bottomCorner :=
float64(x) < float64(y) *
(float64(width) / float64(height))
if bottomCorner {
highlighted = float64(x) < float64(height) - float64(y)
} else {
highlighted = float64(width) - float64(x) > float64(y)
}
if highlighted {
return chiseled.Highlight.AtWhen(x, y, width, height)
} else {
return chiseled.Shadow.AtWhen(x, y, width, height)
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}
}