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package field
func (f Field) Get(x, y int) int {
if y >= f.y && y < f.y+f.ly {
l := f.lines[y-f.y]
if x >= l.x && x < l.x+l.l {
return l.columns[x-l.x]
}
}
return ' '
}
func (f Field) isIn(x, y int) bool {
return x >= f.x && x < f.x+f.lx && y >= f.y && y < f.y+f.ly
}
func (f *Field) Set(x, y, v int) {
if v == ' ' {
f.Blank(x, y)
return
}
if y >= f.y {
if y < f.y+f.ly {
l := &f.lines[y-f.y]
if l.l == 0 {
// an empty line is a special case
l.x = x
l.l = 1
l.columns = append(l.columns, v)
} else if x >= l.x {
if x < l.x+l.l {
// just set the value
l.columns[x-l.x] = v
} else {
// append columns
newL := x - l.x + 1
for i := l.l; i < newL-1; i++ {
l.columns = append(l.columns, ' ')
}
l.columns = append(l.columns, v)
l.l = newL
if f.lx-f.x < l.l-l.x {
f.lx = l.l - l.x
}
}
} else {
// prepend columns
newL := l.l + l.x - x
c := make([]int, newL)
c[0] = v
for i := 1; i < l.x-x; i++ {
c[i] = ' '
}
for i := l.x - x; i < newL; i++ {
c[i] = l.columns[i-l.x+x]
}
l.columns = c
l.x = x
l.l = newL
if f.x > x {
f.lx = f.lx + f.x - x
f.x = x
}
}
} else {
// append lines
newLy := y - f.y + 1
for i := f.ly; i < newLy-1; i++ {
f.lines = append(f.lines, Line{})
}
f.lines = append(f.lines, Line{x: x, l: 1, columns: []int{v}})
f.ly = newLy
if f.x > x {
f.lx = f.lx + f.x - x
f.x = x
}
if f.lx-f.x < x {
f.lx = x - f.x
}
}
} else {
// prepend lines
newLy := f.ly + f.y - y
lines := make([]Line, newLy)
lines[0] = Line{x: x, l: 1, columns: []int{v}}
for j := f.y - y; j < newLy; j++ {
lines[j] = f.lines[j-f.y+y]
}
f.lines = lines
f.y = y
f.ly = newLy
if f.x > x {
f.lx = f.lx + f.x - x
f.x = x
}
if f.lx-f.x < x {
f.lx = x - f.x + 1
}
}
}
func (f Field) Dump() (int, int, int, int) {
return f.x, f.y, f.lx, f.ly
}
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