ginger/gim/line.go
2018-06-08 00:17:49 +00:00

32 lines
862 B
Go

package main
import (
"github.com/mediocregopher/ginger/gim/geo"
"github.com/mediocregopher/ginger/gim/terminal"
)
type line struct {
from, to *box
fromI, toI int
bodyBuf *terminal.Buffer
}
func (l line) draw(buf *terminal.Buffer, flowDir, secFlowDir geo.XY) {
from, to := *(l.from), *(l.to)
start := from.rect().Edge(flowDir, secFlowDir)[0].Add(secFlowDir.Scale(l.fromI*2 + 1))
end := to.rect().Edge(flowDir.Inv(), secFlowDir)[0]
end = end.Add(flowDir.Inv())
end = end.Add(secFlowDir.Scale(l.toI*2 + 1))
buf.SetPos(start)
buf.WriteRune(terminal.SingleLine.Perpendicular(flowDir))
buf.DrawLine(start.Add(flowDir), end.Add(flowDir.Inv()), flowDir, terminal.SingleLine)
buf.SetPos(end)
buf.WriteRune(terminal.SingleLine.Arrow(flowDir))
// draw the body
if l.bodyBuf != nil {
buf.DrawBufferCentered(start.Midpoint(end), l.bodyBuf)
}
}