path: root/vendor/github.com/gizak/termui/pos.go

// Copyright 2017 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)
}