Resolving hiqua's comments

uhabits-core/src/jvmMain/java/org/isoron/uhabits/core/models/Entry.kt

@@ -27,7 +27,7 @@ data class Entry(
         /**
          * Value indicating that the habit is not applicable for this timestamp.
          */
-        const val SKIP = -2
+        const val SKIP = 3
 
         /**
          * Value indicating that the user has performed the habit at this timestamp.

uhabits-core/src/jvmMain/java/org/isoron/uhabits/core/ui/screens/habits/show/views/HistoryCard.kt

@@ -153,15 +153,11 @@ class HistoryCardPresenter(
             val series = if (habit.isNumerical) {
                 entries.map {
                     when {
-                        it.value == SKIP -> {
-                            HistoryChart.Square.HATCHED
-                        }
-                        it.value > 0 -> {
-                            HistoryChart.Square.ON
-                        }
-                        else -> {
-                            HistoryChart.Square.OFF
-                        }
+                        it.value == Entry.UNKNOWN -> OFF
+                        it.value == SKIP -> HATCHED
+                        (habit.targetType == AT_MOST) && (it.value / 1000.0 <= habit.targetValue) -> ON
+                        (habit.targetType == AT_LEAST) && (it.value / 1000.0 >= habit.targetValue) -> ON
+                        else -> GREY
                     }
                 }
             } else {