mirror of https://github.com/cjbassi/gotop.git
100 lines
2.3 KiB
Go
100 lines
2.3 KiB
Go
package termui
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import (
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"image"
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)
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// Cell is a rune with assigned Fg and Bg.
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type Cell struct {
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Ch rune
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Fg Color
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Bg Color
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}
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// Buffer is a renderable rectangle cell data container.
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type Buffer struct {
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Area image.Rectangle // selected drawing area
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CellMap map[image.Point]Cell
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}
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// NewCell returne a new Cell given all necessary fields.
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func NewCell(ch rune, Fg, Bg Color) Cell {
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return Cell{ch, Fg, Bg}
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}
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// NewBuffer returns a new empty Buffer.
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func NewBuffer() *Buffer {
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return &Buffer{
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CellMap: make(map[image.Point]Cell),
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Area: image.Rectangle{},
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}
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}
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// NewFilledBuffer returns a new Buffer filled with the given Cell.
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func NewFilledBuffer(x0, y0, x1, y1 int, c Cell) *Buffer {
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buf := NewBuffer()
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buf.Area.Min = image.Pt(x0, y0)
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buf.Area.Max = image.Pt(x1, y1)
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buf.Fill(c)
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return buf
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}
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// SetCell assigns a Cell to (x,y).
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func (self *Buffer) SetCell(x, y int, c Cell) {
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self.CellMap[image.Pt(x, y)] = c
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}
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// SetString assigns a string to a Buffer starting at (x,y).
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func (self *Buffer) SetString(x, y int, s string, fg, bg Color) {
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for i, char := range s {
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self.SetCell(x+i, y, Cell{char, fg, bg})
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}
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}
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// At returns the cell at (x,y).
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func (self *Buffer) At(x, y int) Cell {
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return self.CellMap[image.Pt(x, y)]
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}
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// SetArea assigns a new rect area to self.
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func (self *Buffer) SetArea(r image.Rectangle) {
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self.Area.Max = r.Max
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self.Area.Min = r.Min
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}
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// SetAreaXY sets the Buffer bounds from (0,0) to (x,y).
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func (self *Buffer) SetAreaXY(x, y int) {
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self.Area.Min.Y = 0
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self.Area.Min.X = 0
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self.Area.Max.Y = y
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self.Area.Max.X = x
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}
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// Merge merges the given buffers onto the current Buffer.
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func (self *Buffer) Merge(bs ...*Buffer) {
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for _, buf := range bs {
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for p, c := range buf.CellMap {
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self.SetCell(p.X, p.Y, c)
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}
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self.SetArea(self.Area.Union(buf.Area))
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}
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}
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// MergeWithOffset merges a Buffer onto another with an offset.
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func (self *Buffer) MergeWithOffset(buf *Buffer, xOffset, yOffset int) {
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for p, c := range buf.CellMap {
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self.SetCell(p.X+xOffset, p.Y+yOffset, c)
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}
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rect := image.Rect(xOffset, yOffset, buf.Area.Max.X+xOffset, buf.Area.Max.Y+yOffset)
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self.SetArea(self.Area.Union(rect))
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}
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// Fill fills the Buffer with a Cell.
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func (self *Buffer) Fill(c Cell) {
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for x := self.Area.Min.X; x < self.Area.Max.X; x++ {
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for y := self.Area.Min.Y; y < self.Area.Max.Y; y++ {
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self.SetCell(x, y, c)
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}
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}
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}
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