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58 lines
1.1 KiB
Go

package app
import (
"github.com/gdamore/tcell/v2"
"github.com/jordanorelli/astro-domu/internal/math"
)
// buffer is a rect of tiles
type buffer struct {
width int
height int
tiles []tile
}
func newBuffer(width, height int) *buffer {
b := &buffer{width: width, height: height}
b.clear()
return b
}
func (b *buffer) set(x, y int, t tile) bool {
n := y*b.width + x
if n >= len(b.tiles) {
return false
}
b.tiles[n] = t
return true
}
func (b *buffer) get(x, y int) (tile, bool) {
n := y*b.width + x
if n >= len(b.tiles) {
return tile{}, false
}
return b.tiles[n], true
}
func (b *buffer) writeString(s string, start math.Vec, style tcell.Style) {
for i, r := range []rune(s) {
if !b.set(start.X+i, start.Y, tile{r: r, style: style}) {
break
}
}
}
func (b *buffer) clear() { b.tiles = make([]tile, b.width*b.height) }
func (b *buffer) blit(s tcell.Screen, offset math.Vec) {
for x := 0; x < b.width; x++ {
for y := 0; y < b.height; y++ {
t, ok := b.get(x, y)
if ok {
s.SetContent(x+offset.X, y+offset.Y, t.r, nil, t.style)
}
}
}
}