Fix errors in a hint[Name]=on styleCheck=error styleCheck=usages (#182)

compilation mode (which seems reasonable to support).

Author: c-blake

src/ggplotnim.nim

@@ -3360,7 +3360,7 @@ proc determinePlotHeight(theme: Theme, filledScales: FilledScales, width, height
     let xS = if theme.xRange.isSome: theme.xRange.unsafeGet else: filledScales.xScale
     let xD = xS.high - xS.low
     let yS = if theme.yRange.isSome: theme.yRange.unsafeGet else: filledScales.yScale
-    let yD = ys.high - ys.low
+    let yD = yS.high - yS.low
     let ratio = yD / xD
     let spacingLR = add(layout.left, layout.right)
     doAssert spacingLR.unit == ukCentimeter

src/ggplotnim/ggplot_drawing.nim

@@ -336,7 +336,7 @@ proc drawRaster(view: var Viewport, fg: FilledGeom, df: DataFrame) =
     numY = (height / hv).round.int
     cMap = fg.colorScale
 
-  let α = if fg.geom.userstyle.alpha.isSome: fg.geom.userstyle.alpha.get else: 1.0
+  let α = if fg.geom.userStyle.alpha.isSome: fg.geom.userStyle.alpha.get else: 1.0
   let αU32 = clamp(α * 255.0, 0.0, 255.0).uint32
   var drawCb = proc(): seq[uint32] =
     result = newSeq[uint32](df.len)

src/ggplotnim/postprocess_scales.nim

@@ -362,13 +362,13 @@ proc fillOptFields(fg: var FilledGeom, fs: FilledScales, df: var DataFrame) =
     fg.invTrans = fs.invTransC
     ## Assign x / y scale of *raster* data
     block RasterScales:
-      let xCol = df[xs.getColName]
+      let xCol = df[xS.getColName]
       if xCol.kind in {colFloat, colInt}:
         fg.rasterXScale = (low: xCol.toTensor(float).min, high: xCol.toTensor(float).max)
       else:
         raise newException(ValueError, "The `x` data aesthetics for the raster plot is neither " &
           "`float` or `int` data. Instead it is: " & $xCol.kind)
-      let yCol = df[ys.getColName]
+      let yCol = df[yS.getColName]
       if yCol.kind in {colFloat, colInt}:
         fg.rasterYScale = (low: yCol.toTensor(float).min, high: yCol.toTensor(float).max)
       else: