feat: Implement horizontal bar chart feature

Package.swift

@@ -110,6 +110,10 @@ let package = Package(
             name: "BarChartFilledCircleHatchedExample",
             dependencies: ["AGGRenderer", "SVGRenderer", "SwiftPlot"],
             path: "examples/BarChartFilledCircleHatched"),
+  .target(
+            name: "BarChartOrientationHorizontalExample",
+            dependencies: ["AGGRenderer", "SVGRenderer", "SwiftPlot"],
+            path: "examples/BarChartOrientationHorizontal"),
         //.testTarget(
         //  name: "swiftplotTests",
         //  dependencies: ["swiftplot"]),

examples/BarChartOrientationHorizontal/main.swift

@@ -0,0 +1,22 @@
+import SwiftPlot
+import AGGRenderer
+import SVGRenderer
+
+var filePath = "examples/Reference/"
+let fileName = "_08_bar_chart"
+
+let x:[String] = ["2008","2009","2010","2011"]
+let y:[Float] = [320,-100,420,500]
+
+var agg_renderer: AGGRenderer = AGGRenderer()
+var svg_renderer: SVGRenderer = SVGRenderer()
+
+var plotTitle: PlotTitle = PlotTitle()
+
+var barGraph: BarGraph = BarGraph()
+barGraph.addSeries(x, y, label: "Plot 1", color: .orange, graphOrientation: .horizontal)
+plotTitle.title = "BAR CHART"
+barGraph.plotTitle = plotTitle
+
+barGraph.drawGraphAndOutput(fileName: filePath+"agg/"+fileName, renderer: agg_renderer)
+barGraph.drawGraphAndOutput(fileName: filePath+"svg/"+fileName, renderer: svg_renderer)

framework/SVGRenderer/SVGRenderer.swift

@@ -67,7 +67,7 @@ public class SVGRenderer: Renderer{
             let h: Float = abs(p2.y - p3.y)
             var y = max(p1.y,p2.y,p3.y,p4.y) + (0.1*plotDimensions.subHeight) - yOffset
             y = plotDimensions.subHeight - y
-            let x = p1.x + xOffset + (0.1*plotDimensions.subWidth)
+            let x = min(p1.x, p2.x, p3.x, p4.x) + xOffset + (0.1*plotDimensions.subWidth)
             let rect: String = "<rect x=\"\(x)\" y=\"\(y)\" width=\"\(w)\" height=\"\(h)\" style=\"fill:rgb(\(fillColor.r*255.0),\(fillColor.g*255.0),\(fillColor.b*255.0));stroke-width:0;stroke:rgb(0,0,0);opacity:\(fillColor.a)\" />"
             image = image + "\n" + rect
             drawHatchingRect(x: x, y: y, width: w, height: h, hatchPattern: hatchPattern)