124 lines
2.5 KiB
Go
124 lines
2.5 KiB
Go
package buf2d
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import (
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"strings"
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)
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// Buffer is a 2-dimensional buffer
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type Buffer[T any] struct {
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data [][]T
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width int
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height int
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parent *Buffer[T]
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StringFunc func(T) string
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}
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// NewBuffer makes a new buffer with the given dimensions
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func NewBuffer[T any](width, height int, defaultValue T) *Buffer[T] {
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b := make([][]T, height)
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for y := range b {
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b[y] = make([]T, width)
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for x := range b[y] {
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b[y][x] = defaultValue
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}
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}
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return &Buffer[T]{
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data: b,
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width: width,
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height: height,
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parent: nil,
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StringFunc: MakeDefaultStringFunc[T](),
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}
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}
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func (b *Buffer[T]) x(x int) int {
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return limit(x, 0, b.width-1)
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}
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func (b *Buffer[T]) y(y int) int {
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return limit(y, 0, b.height-1)
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}
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// Set sets the value at position (x,y) to c
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func (b *Buffer[T]) Set(x, y int, v T) {
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b.data[b.y(y)][b.x(x)] = v
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}
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// Get returns the value at position (x,y)
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func (b *Buffer[T]) Get(x, y int) T {
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return b.data[y][x]
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}
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// Size returns width and height of b
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func (b *Buffer[T]) Size() (w, h int) {
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return b.width, b.height
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}
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// Width returns the width of b
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func (b *Buffer[T]) Width() int {
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return b.width
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}
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// Height returns the height of b
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func (b *Buffer[T]) Height() int {
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return b.height
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}
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// ForEach calls f for every value in this buffer
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func (b *Buffer[T]) ForEachLine(f func(line int, content []T)) {
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for line, content := range b.data {
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f(line, content)
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}
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}
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// ForEach calls f for every value in this buffer
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func (b *Buffer[T]) ForEach(f func(x, y int, v T)) {
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for y, col := range b.data {
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for x, v := range col {
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f(x, y, v)
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}
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}
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}
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func (b *Buffer[T]) String() string {
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s := new(strings.Builder)
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for ci, col := range b.data {
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for _, v := range col {
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s.WriteString(b.StringFunc(v))
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}
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if ci != len(b.data)-1 {
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s.WriteRune('\n')
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}
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}
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return s.String()
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}
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// Sub returns a buffer which is completely contained in this buffer
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// Modifying the main buffer or the sub buffer will modify the other one as well
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// This method can be used recursively
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// If the given dimensions don't fit in the parent buffer, it will be truncated
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func (b *Buffer[T]) Sub(x, y, w, h int) *Buffer[T] {
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// sanitize inputs
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x = limit(x, 0, b.width-1)
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y = limit(y, 0, b.height-1)
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w = limit(w, 1, b.width-x)
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h = limit(h, 1, b.height-y)
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// make slice references
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data := make([][]T, h)
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for dy := 0; dy < h; dy++ {
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col := b.data[y+dy]
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data[dy] = col[x : x+w]
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}
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// make buffer
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return &Buffer[T]{
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data: data,
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width: w,
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height: h,
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parent: b,
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StringFunc: b.StringFunc,
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}
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}
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