Method charStartPos

texteditor/render.go:91–114

charStartPos returns the starting (top left) render coords for the given position -- makes no attempt to rationalize that pos (i.e., if not in visible range, position will be out of range too)

(pos lexer.Pos)

// position -- makes no attempt to rationalize that pos (i.e., if not in
// visible range, position will be out of range too)
func (ed *Editor) charStartPos(pos lexer.Pos) math32.Vector2 {
	spos := ed.renderStartPos()
	spos.X += ed.LineNumberOffset
	if pos.Ln >= len(ed.offsets) {
		if len(ed.offsets) > 0 {
			pos.Ln = len(ed.offsets) - 1
		} else {
			return spos
		}
	} else {
		spos.Y += ed.offsets[pos.Ln]
	}
	if pos.Ln >= len(ed.renders) {
		return spos
	}
	rp := &ed.renders[pos.Ln]
	if len(rp.Spans) > 0 {
		// note: Y from rune pos is baseline
		rrp, _, _, _ := ed.renders[pos.Ln].RuneRelPos(pos.Ch)
		spos.X += rrp.X
		spos.Y += rrp.Y - ed.renders[pos.Ln].Spans[0].RelPos.Y // relative
	}
	return spos
}

// charStartPosVisible returns the starting pos for given position
// that is currently visible, based on bounding boxes.