rfac: Change global constant zeroPoint into a static property on Point and adjust everywhere where it was being used.

Author: odmir

Sources/AGGRenderer/AGGRenderer/AGGRenderer.swift

@@ -4,7 +4,7 @@ import SwiftPlot
 
 public class AGGRenderer: Renderer{
 
-    public var offset = zeroPoint
+    public var offset: Point = .zero
     public var imageSize: Size {
         willSet {
           delete_plot(agg_object);

Sources/QuartzRenderer/QuartzRenderer.swift

@@ -19,7 +19,7 @@ public class QuartzRenderer: Renderer {
     /// Whether or not this context was given to us. If `true`, we should never re-make `context`
     let isExternalContext: Bool
     var fontPath = ""
-    public var offset = zeroPoint
+    public var offset: Point = .zero
 
     public var fontSmoothing: Bool = false {
         didSet { context.setShouldSmoothFonts(fontSmoothing) }

Sources/SVGRenderer/SVGRenderer.swift

@@ -24,7 +24,7 @@ public class SVGRenderer: Renderer{
     static let gridHatch: String = #"<defs><pattern id="gridHatch" width="10" height="10" patternUnits="userSpaceOnUse"><line x1="0" y1="5" x2="10" y2="5" style="stroke:black; stroke-width:1" /><line x1="5" y1="0" x2="5" y2="10" style="stroke:black; stroke-width:1" /></pattern></defs>"#
     static let crossHatch: String = #"<defs><pattern id="crossHatch" width="10" height="10" patternUnits="userSpaceOnUse"><line x1="0" y1="0" x2="10" y2="10" style="stroke:black; stroke-width:1" /><line x1="0" y1="10" x2="10" y2="0" style="stroke:black; stroke-width:1" /></pattern></defs>"#
 
-    public var offset = zeroPoint
+    public var offset: Point = .zero
     public var imageSize: Size
 
     var hatchingIncluded = Array(repeating: false,

Sources/SwiftPlot/BarChart.swift

@@ -18,8 +18,8 @@ public class BarGraph<T:LosslessStringConvertible,U:FloatConvertible>: Plot {
     var stackSeries = [Series<T,U>]()
     var scaleY: Float = 1
     var scaleX: Float = 1
-    var barWidth : Int = 0
-    var origin = zeroPoint
+    var barWidth: Int = 0
+    var origin: Point = .zero
 
     public init(enableGrid: Bool = false){
         self.enableGrid = enableGrid
@@ -123,7 +123,7 @@ extension BarGraph: HasGraphLayout {
             }
 
             if (minimumY >= U(0)) {
-                origin = zeroPoint
+                origin = .zero
                 minimumY = U(0)
             }
             else{
@@ -208,7 +208,7 @@ extension BarGraph: HasGraphLayout {
             }
 
             if minimumX >= U(0) {
-                origin = zeroPoint
+                origin = .zero
                 minimumX = U(0)
             }
             else{

Sources/SwiftPlot/GraphLayout.swift

@@ -90,7 +90,7 @@ public struct GraphLayout {
     /// Calculates the region of the plot which is used for displaying the plot's data (inside all of the chrome).
     func calcBorder(sizes: Results.Sizes, renderer: Renderer) -> Rect {
         var borderRect = Rect(
-            origin: zeroPoint,
+            origin: .zero,
             size: self.plotSize
         )
         if let xLabel = sizes.xLabelSize {
@@ -179,7 +179,7 @@ public struct GraphLayout {
     // Drawing.
 
     func drawBackground(results: Results, renderer: Renderer) {
-        renderer.drawSolidRect(Rect(origin: zeroPoint, size: plotSize), fillColor: backgroundColor, hatchPattern: .none)
+        renderer.drawSolidRect(Rect(origin: .zero, size: plotSize), fillColor: backgroundColor, hatchPattern: .none)
         if let plotBackgroundColor = plotBackgroundColor {
             renderer.drawSolidRect(results.plotBorderRect, fillColor: plotBackgroundColor, hatchPattern: .none)
         }

Sources/SwiftPlot/Histogram.swift

@@ -16,7 +16,7 @@ public class Histogram<T:FloatConvertible>: Plot {
     var scaleX: Float = 1
     var barWidth: Float = 0
     var xMargin: Float = 5
-    var origin = zeroPoint
+    var origin: Point = .zero
 
     public init(isNormalized: Bool = false,
                 enableGrid: Bool = false){

Sources/SwiftPlot/Pair.swift

@@ -10,7 +10,10 @@ public struct Pair<T,U> {
 }
 
 public typealias Point = Pair<Float,Float>
-public let zeroPoint = Point(0.0, 0.0)
+
+extension Point {
+    public static let zero = Point(0.0, 0.0)
+}
 
 public func + (lhs: Point, rhs: Point) -> Point {
     return Point(lhs.x + rhs.x, lhs.y + rhs.y)
@@ -42,7 +45,7 @@ public struct Rect {
 }
 extension Rect {
 
-    public static let empty = Rect(origin: zeroPoint, size: .zero)
+    public static let empty = Rect(origin: .zero, size: .zero)
 
     public var normalized: Rect {
         let normalizedOrigin = Point(origin.x + (size.width < 0 ? size.width : 0),