Better floating point readout

draw.go

@@ -136,13 +136,32 @@ func drawNumberReadoutsFloat () {
 		application.SetDot((25 - len(err.Error())) / 2, height - 6)
 		fmt.Fprint(application, err.Error())
 	} else {
-		// TODO: display floats in these radixes. ignore the whole
-		// signs thing. floats are always signed so we need to always
-		// display a sign.
-		// drawHexadecimal (0, height - 10, uint64(number))
-		// drawDecimal     (0, height - 8,  uint64(number))
-		// drawOctal       (0, height - 6,  uint64(number))
-		drawBinary      (0, height - 4,  math.Float64bits(number))
+		firstHalf  := int64(math.Floor(number))
+		secondHalf := (number - math.Floor(number))
+
+		application.SetDot(0, height - 7)
+		fmt.Fprint(application, "10")
+		application.SetColor(0, height - 7, stone.ColorBlue)
+		application.SetColor(1, height - 7, stone.ColorBlue)
+
+		application.SetDot(3, height - 7)
+		fmt.Fprintf(application, "%+d", firstHalf)
+		application.SetRune(3, height - 6, '.')
+
+		for index := 4; index < 25; index ++ {
+			secondHalf *= 10
+			secondHalf = math.Mod(secondHalf, 10)
+			digit := rune(secondHalf) + '0'
+			application.SetRune(index, height - 6, digit)
+		}
+		
+		drawBinary(0, height - 4,  math.Float64bits(number))
+
+		if math.Signbit(number) {
+			application.SetColor(3, height - 7, stone.ColorRed)
+		} else {
+			application.SetColor(3, height - 7, stone.ColorGreen)
+		}
 	}
 }