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render.go
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render.go
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/*
* Copyright (c) 2022, nwillc@gmail.com
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package typeface
import (
"fmt"
"github.com/gdamore/tcell/v2"
"github.com/nwillc/genfuncs"
)
var blockOff = style(tcell.ColorBlack, tcell.ColorBlack)
// RenderRune renders the FontRune for a specified rune in a Font at a given location.
func RenderRune(s tcell.Screen, r rune, font Font, c tcell.Color, x int, y int) *genfuncs.Result[int] {
fontRune, ok := font[r]
if !ok {
return genfuncs.NewError[int](fmt.Errorf("no font char for rune %c", r))
}
blockOn := style(c, tcell.ColorBlack)
for yy, line := range fontRune {
for xx, point := range line {
style := blockOff
if point {
style = blockOn
}
s.SetCell(x+xx, y+yy, style, 0x2588)
}
}
return genfuncs.NewResult(len(fontRune))
}
func style(foreground tcell.Color, background tcell.Color) tcell.Style {
return tcell.StyleDefault.Foreground(foreground).Background(background)
}