Press tab to view the end result in the readout instead!

draw.go

@@ -11,6 +11,13 @@ func clear (x, y, width, height int) {
 	}}
 }
 
+func fillColor (x, y, width, height int, color stone.Color) {
+	for yy := 0; yy < height; yy ++ {
+	for xx := 0; xx < width;  xx ++ {
+		application.SetColor(xx + x, yy + y, color)
+	}}
+}
+
 func redraw () {
 	width, _ := application.Size()
 	showLeftColumn = width > 44
@@ -60,13 +67,30 @@ func drawInput () {
 
 func drawNumberReadouts () {
 	_, height := application.Size()
+
+	indicatorY := height - 12
+	application.SetDot(0, indicatorY)
+	fmt.Fprint(application, "sel fin")
+	fillColor(0, indicatorY, 10, 1, stone.ColorDim)
+
+	if showEndResult {
+		fillColor(4, indicatorY, 3, 1, stone.ColorBlue)
+	} else {
+		fillColor(0, indicatorY, 3, 1, stone.ColorBlue)
+	}
 	
 	clear(0, height - 10, 25, 10)
 		
 	var number int64
 	var err error
-	if selectedExpression != nil {
+	if showEndResult {
-		number, err = selectedExpression.Solution()
+		if expressionRoot != nil {
+			number, err = expressionRoot.Solution()
+		}
+	} else {
+		if selectedExpression != nil {
+			number, err = selectedExpression.Solution()
+		}
 	}
 
 	if err != nil {

main.go

@@ -15,10 +15,11 @@ var application = &stone.Application { }
 var expressionRoot Expression
 var inputBuffer stone.DamageBuffer
 var showLeftColumn bool
+var showEndResult  bool
 
 func main () {
 	application.SetTitle("MathPan")
-	application.SetSize(64, 10)
+	application.SetSize(64, 12)
 
 	icon, _, err := image.Decode(bytes.NewReader(iconBytes))
 	if err != nil { panic(err) }
@@ -80,6 +81,11 @@ func onPress (button stone.Button, modifiers stone.Modifiers) {
 		redraw()
 		application.Draw()
 
+	case stone.KeyTab:
+		showEndResult = !showEndResult
+		redraw()
+		application.Draw()
+
 	case stone.KeyDelete:
 		if selectedExpression == nil { break }
 		parent := selectedExpression.Parent()