Buffer, DamageBuffer, and Application are io.Writers

backends/pixel/pixel.go

@@ -19,6 +19,7 @@ type Backend struct {
 	backgroundStamper *imdraw.IMDraw
 	fontAtlas         *text.Atlas
 	textDrawer        *text.Text
+	showBounds        bool
 
 	metrics struct {
 		cellWidth  int
@@ -176,15 +177,18 @@ func (backend *Backend) draw () {
 			backend.textDrawer.Draw(backend.window, pixel.IM)
 		}
 	}
-	
-	backend.backgroundStamper.Clear()
-	backend.backgroundStamper.Color =
-		backend.config.Color(stone.ColorBackground)
-	backend.backgroundStamper.Push (
-		backend.vectorAtPosition(0, 0),
-		backend.vectorAtPosition(width, height))
-	backend.backgroundStamper.Rectangle(1)
-	backend.backgroundStamper.Draw(backend.window)
+
+	// draw a rectangle around the buffer if we are showing bounds
+	if backend.showBounds {
+		backend.backgroundStamper.Clear()
+		backend.backgroundStamper.Color =
+			backend.config.Color(stone.ColorBackground)
+		backend.backgroundStamper.Push (
+			backend.vectorAtPosition(0, 0),
+			backend.vectorAtPosition(width, height))
+		backend.backgroundStamper.Rectangle(1)
+		backend.backgroundStamper.Draw(backend.window)
+	}
 
 	backend.window.SwapBuffers()
 }

buffer.go

@@ -43,6 +43,10 @@ type Buffer struct {
 	content []Cell
 	width  int
 	height int
+	Dot struct {
+		X int
+		Y int
+	}
 }
 
 func (buffer *Buffer) Size () (width, height int) {
@@ -74,6 +78,27 @@ func (buffer *Buffer) SetRune (x, y int, content rune) {
 	buffer.content[x + y * buffer.width].content = content
 }
 
+func (buffer *Buffer) Write (bytes []byte) (bytesWritten int, err error) {
+	text := string(bytes)
+	bytesWritten = len(bytes)
+	
+	for _, character := range text {
+		buffer.SetRune(buffer.Dot.X, buffer.Dot.Y, character)
+		buffer.Dot.X ++
+		if buffer.Dot.X > buffer.width {
+			buffer.Dot.X = 0
+			buffer.Dot.Y --
+		}
+	}
+	
+	return
+}
+
+func (buffer *Buffer) ResetDot () {
+	buffer.Dot.X = 0
+	buffer.Dot.Y = 0
+}
+
 type DamageBuffer struct {
 	Buffer
 	clean []bool
@@ -99,6 +124,22 @@ func (buffer *DamageBuffer) SetRune (x, y int, content rune) {
 	buffer.clean[x + y * buffer.width] = false
 }
 
+func (buffer *DamageBuffer) Write (bytes []byte) (bytesWritten int, err error) {
+	text := string(bytes)
+	bytesWritten = len(bytes)
+	
+	for _, character := range text {
+		buffer.SetRune(buffer.Dot.X, buffer.Dot.Y, character)
+		buffer.Dot.X ++
+		if buffer.Dot.X > buffer.width {
+			buffer.Dot.X = 0
+			buffer.Dot.Y --
+		}
+	}
+	
+	return
+}
+
 func (buffer *DamageBuffer) Clean (x, y int) (clean bool) {
 	clean = buffer.clean[x + y * buffer.width]
 	return

examples/hello/main.go

@@ -1,5 +1,7 @@
 package main
 
+import "fmt"
+import "time"
 import "git.tebibyte.media/sashakoshka/stone"
 import _ "git.tebibyte.media/sashakoshka/stone/backends/pixel"
 
@@ -9,30 +11,31 @@ func main () {
 }
 
 func run (application *stone.Application) {
+	currentTime := time.Time { }
+	frameDelay  := time.Second / 2
+	
 	for {
-		if application.Resized() {
-			application.SetRune(0, 0, 'h')
-			application.SetRune(1, 0, 'e')
-			application.SetRune(2, 0, 'l')
-			application.SetRune(3, 0, 'l')
-			application.SetRune(4, 0, 'o')
-			application.SetRune(5, 0, 'r')
-			application.SetRune(6, 0, 'l')
-			application.SetRune(7, 0, 'd')
-			application.SetRune(8, 0, '!')
-			application.SetRune(4, 1, ':')
-			application.SetRune(5, 1, '3')
-			application.SetRune(0, 2, 'A')
-			application.SetRune(1, 2, 'A')
-			application.SetRune(2, 2, 'A')
-			application.SetRune(3, 2, 'A')
-			application.SetRune(4, 2, 'A')
-			application.SetRune(5, 2, 'A')
-			application.SetRune(6, 2, 'A')
-			application.SetRune(7, 2, 'A')
-			application.SetRune(8, 2, 'A')
+		if application.Resized() || time.Since(currentTime) > frameDelay {
+			currentTime = time.Now()
+
+			application.ResetDot()
+			fmt.Fprintln(application, "hellorld!")
+
+			hour   := currentTime.Hour()
+			minute := currentTime.Minute()
+			second := currentTime.Second()
+
+			application.SetRune(0, 1, rune(hour / 10 + 48))
+			application.SetRune(1, 1, rune(hour % 10 + 48))
+			application.SetRune(2, 1, ':')
+			application.SetRune(3, 1, rune(minute / 10 + 48))
+			application.SetRune(4, 1, rune(minute % 10 + 48))
+			application.SetRune(5, 1, ':')
+			application.SetRune(6, 1, rune(second / 10 + 48))
+			application.SetRune(7, 1, rune(second % 10 + 48))
+			
 		}
 		
-		if !application.Await(0) { break }
+		if !application.Await(frameDelay) { break }
 	}
 }