#2: Implement Grid Sheet demo

Demo/GridSheet.playground/Contents.swift

@@ -0,0 +1,48 @@
+import SwiftyHaru
+
+func createLabelSequence(stride: Int) -> AnySequence<String> {
+
+    let seq = sequence(first: 0, next: { $0 + stride }).lazy.map(String.init)
+
+    return "" + AnySequence(seq).dropFirst()
+}
+
+let document = PDFDocument()
+let page = document.addPage(width: 400, height: 600)
+
+let topLabelParameters =
+    Grid.LabelParameters(sequence: createLabelSequence(stride: 50),
+                         frequency: 5,
+                         offset: Vector(x: 0, y: -6))
+
+let bottomLabelParameters =
+    Grid.LabelParameters(sequence: createLabelSequence(stride: 50),
+                         frequency: 5,
+                         offset: Vector(x: 0, y: 6))
+
+let leftLabelParameters =
+    Grid.LabelParameters(sequence: createLabelSequence(stride: 10),
+                         frequency: 1,
+                         offset: Vector(x: 6, y: 0))
+
+let labels = Grid.Labels(top: topLabelParameters,
+                         bottom: bottomLabelParameters,
+                         left: leftLabelParameters,
+                         right: nil)
+
+let verticalSerifParameters = Grid.SerifParameters(frequency: 1)
+let horizontalSerifParameters = Grid.SerifParameters(frequency: 5)
+
+let serifs = Grid.Serifs(top: horizontalSerifParameters,
+                         bottom: horizontalSerifParameters,
+                         left: verticalSerifParameters,
+                         right: nil)
+
+let grid = Grid(width: page.width,
+                height: page.height,
+                labels: labels,
+                serifs: serifs)
+
+page.draw(object: grid, position: .zero)
+
+document.display()

Demo/GridSheet.playground/Sources/ViewConfiguration.swift

@@ -0,0 +1,17 @@
+import Quartz
+import PlaygroundSupport
+import SwiftyHaru
+
+public extension SwiftyHaru.PDFDocument {
+
+    public func display() {
+
+        let view = PDFView(frame: NSRect(x: 0, y: 0, width: 480, height: 640))
+
+        view.document = PDFDocument(data: getData())
+
+        view.scaleFactor = 0.75
+
+        PlaygroundPage.current.liveView = view
+    }
+}

Demo/GridSheet.playground/contents.xcplayground

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='5.0' target-platform='macos'>
+    <timeline fileName='timeline.xctimeline'/>
+</playground>