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// Copyright 2016 Zack Guo <zack.y.guo@gmail.com>. All rights reserved.
// Use of this source code is governed by a MIT license that can
// be found in the LICENSE file.
package termui
import "image"
// Align is the position of the gauge's label.
type Align uint
// All supported positions.
const (
AlignNone Align = 0
AlignLeft Align = 1 << iota
AlignRight
AlignBottom
AlignTop
AlignCenterVertical
AlignCenterHorizontal
AlignCenter = AlignCenterVertical | AlignCenterHorizontal
)
func AlignArea(parent, child image.Rectangle, a Align) image.Rectangle {
w, h := child.Dx(), child.Dy()
// parent center
pcx, pcy := parent.Min.X+parent.Dx()/2, parent.Min.Y+parent.Dy()/2
// child center
ccx, ccy := child.Min.X+child.Dx()/2, child.Min.Y+child.Dy()/2
if a&AlignLeft == AlignLeft {
child.Min.X = parent.Min.X
child.Max.X = child.Min.X + w
}
if a&AlignRight == AlignRight {
child.Max.X = parent.Max.X
child.Min.X = child.Max.X - w
}
if a&AlignBottom == AlignBottom {
child.Max.Y = parent.Max.Y
child.Min.Y = child.Max.Y - h
}
if a&AlignTop == AlignRight {
child.Min.Y = parent.Min.Y
child.Max.Y = child.Min.Y + h
}
if a&AlignCenterHorizontal == AlignCenterHorizontal {
child.Min.X += pcx - ccx
child.Max.X = child.Min.X + w
}
if a&AlignCenterVertical == AlignCenterVertical {
child.Min.Y += pcy - ccy
child.Max.Y = child.Min.Y + h
}
return child
}
func MoveArea(a image.Rectangle, dx, dy int) image.Rectangle {
a.Min.X += dx
a.Max.X += dx
a.Min.Y += dy
a.Max.Y += dy
return a
}
var termWidth int
var termHeight int
func TermRect() image.Rectangle {
return image.Rect(0, 0, termWidth, termHeight)
}
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