Fix #1829 #1813 #1831

src/arr/trove/charts-util.arr

@@ -0,0 +1,71 @@
+provide:
+  data StackType,
+  data PointShape,
+  data TrendlineType,
+  data AxisType
+end
+
+data StackType:
+  | absolute
+  | relative
+  | percent
+  | grouped
+end
+
+
+
+fun check-positive-degree(v :: Number) -> Boolean block: 
+  when v < 0: 
+    raise("degree: degree must be non-negative")
+  end
+  true
+end
+
+data TrendlineType:
+  | no-trendline
+  | tl-linear
+  | tl-exponential
+  | tl-polynomial(degree :: NumInteger%(check-positive-degree))
+end
+
+fun check-positive-sides(v :: Number) -> Boolean block: 
+  when v < 0: 
+    raise("regular-polygon-shape: number of sides must be non-negative")
+  end
+  true
+end
+
+fun check-valid-dent(v :: Number) -> Boolean block: 
+  when (v < 0) or (v > 1): 
+    raise("regular-polygon-shape: dent must be between 0 and 1")
+  end
+  true
+end
+
+data PointShape: 
+  | circle-shape
+  | regular-polygon-shape(sides :: NumInteger%(check-positive-sides), dent :: Number%(check-valid-dent))
+end
+
+
+fun check-non-neg-base(n :: Number) -> Boolean block:
+  when n <= 0:
+    raise("Axis scale: exponential and logarithmic scales must have positive base")
+  end
+  true
+end
+
+
+fun check-non-neg-power(n :: Number) -> Boolean block:
+  when n <= 0:
+    raise("Axis scale: power must be positive")
+  end
+  true
+end
+
+data AxisType:
+  | at-linear
+  | at-power(pow :: Number%(check-non-neg-power))
+  | at-log(base :: Number%(check-non-neg-base))
+  | at-symlog(constant :: Number%(check-non-neg-base))
+end