Added Buffer interface, and clear method

application.go

@@ -4,7 +4,7 @@ import "image"
 
 // Application represents an application.
 type Application struct {
-	Buffer
+	DamageBuffer
 	
 	title string
 	icons []image.Image
@@ -22,7 +22,7 @@ func (application *Application) Run () (
 	width, height := application.Size()
 	if width  < 1 { width  = 80 }
 	if height < 1 { height = 20 }
-	application.Buffer.SetSize(width, height)
+	application.DamageBuffer.SetSize(width, height)
 
 	application.config.load()
 

buffer.go

@@ -53,11 +53,22 @@ func (cell Cell) Rune () (content rune) {
 	return
 }
 
-// Buffer is a two dimensional text buffer that stores a grid of cells, as well
-// as information stating whether each cell is clean or dirty. Cells are dirty
-// by default, are only clean when marked as clean, and become dirty again when
-// they are altered in some way.
-type Buffer struct {
+// Buffer represents a two dimensional text buffer.
+type Buffer interface {
+	Size     () (with, height int)
+	Cell     (x, y int) (cell Cell)
+	SetColor (x, y int, color Color)
+	SetSize  (with, height int)
+	SetStyle (x, y int, style Style)
+	SetRune  (x, y int, content rune)
+	Clear    ()
+}
+
+// DamageBuffer is a two dimensional text buffer that stores a grid of cells, as
+// well as information stating whether each cell is clean or dirty. Cells are
+// dirty by default, are only clean when marked as clean, and become dirty again
+// when they are altered in some way.
+type DamageBuffer struct {
 	content []Cell
 	clean   []bool
 	
@@ -73,7 +84,7 @@ type Buffer struct {
 	lock sync.RWMutex
 }
 
-func (buffer *Buffer) isOutOfBounds (x, y int) (outOfBounds bool) {
+func (buffer *DamageBuffer) isOutOfBounds (x, y int) (outOfBounds bool) {
 	outOfBounds =
 		x < 0 ||
 		y < 0 ||
@@ -83,7 +94,7 @@ func (buffer *Buffer) isOutOfBounds (x, y int) (outOfBounds bool) {
 }
 
 // Size returns the width and height of the buffer.
-func (buffer *Buffer) Size () (width, height int) {
+func (buffer *DamageBuffer) Size () (width, height int) {
 	buffer.lock.RLock()
 	defer buffer.lock.RUnlock()
 	
@@ -94,14 +105,14 @@ func (buffer *Buffer) Size () (width, height int) {
 
 // SetDot sets the buffer's text insertion position relative to the buffer
 // origin point (0, 0).
-func (buffer *Buffer) SetDot (x, y int) {
+func (buffer *DamageBuffer) SetDot (x, y int) {
 	buffer.dot.x = x
 	buffer.dot.y = y
 }
 
 // Cell returns the cell at the specified x and y coordinates. If the
 // coordinates are out of bounds, this method will return a blank cell.
-func (buffer *Buffer) Cell (x, y int) (cell Cell) {
+func (buffer *DamageBuffer) Cell (x, y int) (cell Cell) {
 	buffer.lock.RLock()
 	defer buffer.lock.RUnlock()
 	
@@ -111,7 +122,7 @@ func (buffer *Buffer) Cell (x, y int) (cell Cell) {
 }
 
 // SetColor sets the color of the cell at the specified x and y coordinates.
-func (buffer *Buffer) SetColor (x, y int, color Color) {
+func (buffer *DamageBuffer) SetColor (x, y int, color Color) {
 	buffer.lock.RLock()
 	defer buffer.lock.RUnlock()
 	
@@ -123,7 +134,7 @@ func (buffer *Buffer) SetColor (x, y int, color Color) {
 
 // SetSize sets the width and height of the buffer. This clears all data in the
 // buffer. If the width or height is negative, this method does nothing.
-func (buffer *Buffer) SetSize (width, height int) {
+func (buffer *DamageBuffer) SetSize (width, height int) {
 	buffer.lock.Lock()
 	defer buffer.lock.Unlock()
 	
@@ -138,7 +149,7 @@ func (buffer *Buffer) SetSize (width, height int) {
 }
 
 // SetStyle sets the style of the cell at the specified x and y coordinates.
-func (buffer *Buffer) SetStyle (x, y int, style Style) {
+func (buffer *DamageBuffer) SetStyle (x, y int, style Style) {
 	buffer.lock.RLock()
 	defer buffer.lock.RUnlock()
 	
@@ -149,14 +160,27 @@ func (buffer *Buffer) SetStyle (x, y int, style Style) {
 }
 
 // SetRune sets the rune of the cell at the specified x and y coordinates.
-func (buffer *Buffer) SetRune (x, y int, content rune) {
+func (buffer *DamageBuffer) SetRune (x, y int, content rune) {
 	buffer.lock.RLock()
 	defer buffer.lock.RUnlock()
 	
 	buffer.setRune(x, y, content)
 }
 
-func (buffer *Buffer) setRune (x, y int, content rune) {
+// Clear resets the entire buffer.
+func (buffer *DamageBuffer) Clear () {
+	buffer.lock.RLock()
+	defer buffer.lock.RUnlock()
+
+	for index := 0; index < len(buffer.content); index ++ {
+		buffer.clean[index] = false
+		buffer.content[index] = Cell {
+			color: ColorForeground,
+		}
+	}
+}
+
+func (buffer *DamageBuffer) setRune (x, y int, content rune) {
 	if buffer.isOutOfBounds(x, y) { return }
 	index := x + y * buffer.width
 	buffer.clean[index] = buffer.content[index].content == content
@@ -165,7 +189,7 @@ func (buffer *Buffer) setRune (x, y int, content rune) {
 
 // Write writes data stored in a byte slice to the buffer at the current dot
 // position. This makes Buffer an io.Writer.
-func (buffer *Buffer) Write (bytes []byte) (bytesWritten int, err error) {
+func (buffer *DamageBuffer) Write (bytes []byte) (bytesWritten int, err error) {
 	buffer.lock.RLock()
 	defer buffer.lock.RUnlock()
 	
@@ -183,7 +207,7 @@ func (buffer *Buffer) Write (bytes []byte) (bytesWritten int, err error) {
 
 // Clean returns whether or not the cell at the specified x and y coordinates is
 // clean.
-func (buffer *Buffer) Clean (x, y int) (clean bool) {
+func (buffer *DamageBuffer) Clean (x, y int) (clean bool) {
 	buffer.lock.RLock()
 	defer buffer.lock.RUnlock()
 	
@@ -193,7 +217,7 @@ func (buffer *Buffer) Clean (x, y int) (clean bool) {
 }
 
 // MarkClean marks the cell at the specified x and y coordinates as clean.
-func (buffer *Buffer) MarkClean (x, y int) {
+func (buffer *DamageBuffer) MarkClean (x, y int) {
 	buffer.lock.RLock()
 	defer buffer.lock.RUnlock()
 	

config.go

@@ -64,9 +64,9 @@ func (config *Config) load () {
 		// green
 		color.RGBA { R: 0x00, G: 0xFF, B: 0x00, A: 0xFF },
 		// blue
-		color.RGBA { R: 0x00, G: 0x00, B: 0xFF, A: 0xFF },
+		color.RGBA { R: 0x00, G: 0x80, B: 0xFF, A: 0xFF },
 		// purple
-		color.RGBA { R: 0x80, G: 0x00, B: 0xFF, A: 0xFF },
+		color.RGBA { R: 0x80, G: 0x40, B: 0xFF, A: 0xFF },
 	}
 	config.fontName = ""
 	config.fontSize = 11