Added chart example #14

examples/charts/.gitignore

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+main
+nimcache

examples/charts/charts.nimble

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+[Package]
+bin           = "main"
+name          = "charts"
+version       = "0.1.0"
+author        = "Filippo Cucchetto"
+description   = "charts"
+license       = "MIT"
+
+[Deps]
+Requires: "nim >= 0.12.1, nimqml >= 0.5.0"

examples/charts/main.nim

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+import NimQml, mylistmodel
+
+proc mainProc() =
+  echo "Starting"
+  var app = newQApplication()
+  defer: app.delete
+
+  var myListModel = newMyListModel();
+  defer: myListModel.delete
+
+  var engine = newQQmlApplicationEngine()
+  defer: engine.delete
+
+  var variant = newQVariant(myListModel)
+  defer: variant.delete
+
+  engine.setRootContextProperty("myListModel", variant)
+  engine.load("main.qml")
+
+  app.exec()
+
+when isMainModule:
+  mainProc()
+  GC_fullcollect()

examples/charts/main.nim.cfg

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+--path:"../../src"

examples/charts/main.qml

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+import QtQuick 2.7
+import QtCharts 2.2
+import QtQuick.Window 2.3
+
+Window {
+    width: 400
+    height: 300
+    title: "Charts"
+
+    Component.onCompleted: visible = true
+
+    ChartView {
+        id: view
+
+        anchors.fill: parent
+
+        VXYModelMapper {
+            id: mapper
+            model: myListModel
+            series: lineSeries
+            xColumn: 0
+            yColumn: 1
+        }
+
+        LineSeries {
+            id: lineSeries
+            name: "LineSeries"
+        }
+    }
+}

examples/charts/mylistmodel.nim

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+import NimQml, Tables
+
+type
+  Point = object
+    x: int
+    y: int
+
+QtObject:
+  type
+    MyListModel* = ref object of QAbstractListModel
+      points*: seq[Point]
+
+  proc delete(self: MyListModel) =
+    self.QAbstractListModel.delete
+
+  proc setup(self: MyListModel) =
+    self.QAbstractListModel.setup
+
+  proc newMyListModel*(): MyListModel =
+    new(result, delete)
+    result.points = @[Point(x: 10, y: 20), Point(x: 20, y: 30)]
+    result.setup
+
+  method rowCount(self: MyListModel, index: QModelIndex = nil): int =
+    if index == nil or not index.isValid:
+      return self.points.len
+    return 0
+
+  method columnCount(self: MyListModel, index: QModelIndex = nil): int =
+    if index == nil or not index.isValid:
+      return 2
+    return 0
+
+  method data(self: MyListModel, index: QModelIndex, role: int): QVariant =
+    result = nil
+    if not index.isValid:
+      return 
+    if index.row < 0 or index.row >= self.points.len:
+      return
+    if index.column < 0 or index.column >= 2:
+      return
+    let point = self.points[index.row]
+    if index.column == 0:
+      return newQVariant(point.x)
+    elif index.column == 1:
+      return newQVariant(point.y)
+    else:
+      return