new playAnimationUntil that stops animation when notify channel receives message

matrix.go

@@ -60,7 +60,7 @@ var DefaultConfig = HardwareConfig{
 }
 
 type RunTimeConfig struct {
-	gpio_slowdown int
+	Gpio_slowdown int
 }
 
 // HardwareConfig rgb-led-matrix configuration
@@ -110,7 +110,7 @@ func (c *HardwareConfig) geometry() (width, height int) {
 
 func (c *RunTimeConfig) rt_options() *C.struct_RGBLedRuntimeOptions {
 	rt := &C.struct_RGBLedRuntimeOptions{}
-	rt.gpio_slowdown = C.int(c.gpio_slowdown)
+	rt.gpio_slowdown = C.int(c.Gpio_slowdown)
 
 	return rt
 }

toolkit.go

@@ -64,7 +64,6 @@ func (tk *ToolKit) PlayAnimation(a Animation) error {
 			return err
 		}
 	}
-
 	if err == io.EOF {
 		return nil
 	}
@@ -72,6 +71,35 @@ func (tk *ToolKit) PlayAnimation(a Animation) error {
 	return err
 }
 
+func (tk *ToolKit) PlayAnimationUntil(a Animation, notify <-chan bool) error {
+
+	var err error
+	var i image.Image
+	var n <-chan time.Time
+	var outerError error
+	for outerError == nil {
+		select {
+		case <-notify:
+			return nil
+		default:
+			i, n, err = a.Next()
+			if err != nil {
+				outerError = err
+				break
+			}
+			if err := tk.PlayImageUntil(i, n); err != nil {
+				return err
+			}
+		}
+	}
+	if outerError == io.EOF {
+		return nil
+	}
+
+	return err
+
+}
+
 // PlayImageUntil draws the given image until is notified to stop
 func (tk *ToolKit) PlayImageUntil(i image.Image, notify <-chan time.Time) error {
 	defer func() {