New overlapped drawing impl.

UnitTests/Views/GraphViewTests.cs

@@ -448,8 +448,8 @@ public class SeriesTests
         var gv = new GraphView ();
         gv.BeginInit ();
         gv.EndInit ();
-        gv.ColorScheme = new ColorScheme ();
         gv.Viewport = new Rectangle (0, 0, 50, 30);
+        gv.ColorScheme = new ColorScheme ();
 
         var fullGraphBounds = RectangleF.Empty;
         var graphScreenBounds = Rectangle.Empty;
@@ -477,6 +477,7 @@ public class SeriesTests
         // Even with a margin the graph should be drawn from 
         // the origin, we just get less visible width/height
         gv.LayoutSubviews ();
+        gv.SetNeedsDisplay ();
         gv.Draw ();
         Assert.Equal (new RectangleF (0, 0, 45, 28), fullGraphBounds);
 
@@ -535,6 +536,7 @@ public class SeriesTests
         // Even with a margin the graph should be drawn from 
         // the origin, we just get less visible width/height
         gv.LayoutSubviews ();
+        gv.SetNeedsDisplay ();
         gv.Draw ();
         Assert.Equal (new RectangleF (0, 0, 90, 140), fullGraphBounds);
 
@@ -672,6 +674,7 @@ public class MultiBarSeriesTests
         multibarSeries.AddBars ("hey", (Rune)'M', 0.5001f, 0.5001f);
         fakeXAxis.LabelPoints.Clear ();
         gv.LayoutSubviews ();
+        gv.SetNeedsDisplay ();
         gv.Draw ();
 
         Assert.Equal (4, fakeXAxis.LabelPoints.Single ());
@@ -680,6 +683,7 @@ public class MultiBarSeriesTests
         multibarSeries.AddBars ("bob", (Rune)'M', 1, 2);
         fakeXAxis.LabelPoints.Clear ();
         gv.LayoutSubviews ();
+        gv.SetNeedsDisplay ();
         gv.Draw ();
 
         Assert.Equal (3, fakeXAxis.LabelPoints.Count);
@@ -741,6 +745,7 @@ public class BarSeriesTests
                            );
 
         // redraw graph
+        graph.SetNeedsDisplay ();
         graph.Draw ();
 
         // since bars are horizontal all have the same X start cordinates
@@ -804,6 +809,7 @@ public class BarSeriesTests
         barSeries.Orientation = Orientation.Vertical;
 
         // redraw graph
+        graph.SetNeedsDisplay ();
         graph.Draw ();
 
         // bar should be drawn at BarEvery 1f + offset 0.5f = 3 screen units
@@ -845,6 +851,7 @@ public class BarSeriesTests
         barSeries.Orientation = Orientation.Vertical;
 
         // redraw graph
+        graph.SetNeedsDisplay ();
         graph.Draw ();
 
         // bar should not be drawn
@@ -869,11 +876,11 @@ public class BarSeriesTests
         var gv = new GraphView ();
         gv.BeginInit ();
         gv.EndInit ();
-        gv.ColorScheme = new ColorScheme ();
 
         // y axis goes from 0.1 to 1 across 10 console rows
         // x axis goes from 0 to 10 across 20 console columns
         gv.Viewport = new Rectangle (0, 0, 20, 10);
+        gv.ColorScheme = new ColorScheme ();
         gv.CellSize = new PointF (0.5f, 0.1f);
 
         gv.Series.Add (series = new FakeBarSeries ());
@@ -913,8 +920,8 @@ public class AxisTests
         GraphViewTests.InitFakeDriver ();
 
         var gv = new GraphView ();
-        gv.ColorScheme = new ColorScheme ();
         gv.Viewport = new Rectangle (0, 0, 50, 30);
+        gv.ColorScheme = new ColorScheme ();
 
         // graph can't be completely empty or it won't draw
         gv.Series.Add (new ScatterSeries ());
@@ -1109,9 +1116,7 @@ public class TextAnnotationTests
         var expected =
             @$"
  │
- ┤      {
-     CM.Glyphs.Dot
- }
+ ┤      {CM.Glyphs.Dot}
  ┤
 0┼┬┬┬┬┬┬┬┬
  0    5";
@@ -1146,6 +1151,7 @@ public class TextAnnotationTests
 
         // user scrolls up one unit of graph space
         gv.ScrollOffset = new PointF (0, 1f);
+        gv.SetNeedsDisplay ();
         gv.Draw ();
 
         // we expect the text annotation to go down one line since
@@ -1179,6 +1185,7 @@ public class TextAnnotationTests
                            );
 
         gv.LayoutSubviews ();
+        gv.SetNeedsDisplay ();
         gv.Draw ();
 
         // long text should get truncated
@@ -1252,6 +1259,7 @@ public class TextAnnotationTests
 
         // user scrolls up one unit of graph space
         gv.ScrollOffset = new PointF (0, 1f);
+        gv.SetNeedsDisplay ();
         gv.Draw ();
 
         // we expect no change in the location of the annotation (only the axis label changes)
@@ -1269,6 +1277,7 @@ public class TextAnnotationTests
 
         // user scrolls up one unit of graph space
         gv.ScrollOffset = new PointF (0, 1f);
+        gv.SetNeedsDisplay ();
         gv.Draw ();
 
         // we expect no change in the location of the annotation (only the axis label changes)
@@ -1527,6 +1536,7 @@ public class PathAnnotationTests
             // render view
             view.ColorScheme = new ColorScheme ();
             Assert.Equal (1, view.Height);
+            mount.SetNeedsDisplay ();
             mount.Draw ();
 
             // should have the initial text
@@ -1534,6 +1544,7 @@ public class PathAnnotationTests
 
             // change the text and redraw
             view.Text = "ff1234";
+            mount.SetNeedsDisplay ();
             mount.Draw ();
 
             // should have the new text rendered
@@ -1565,6 +1576,7 @@ public class PathAnnotationTests
         gv.MarginBottom = 1;
 
         gv.LayoutSubviews ();
+        gv.SetNeedsDisplay ();
         gv.Draw ();
 
         var expected =
@@ -1572,13 +1584,9 @@ public class PathAnnotationTests
    │
   2┤
    │
-  1┤{
-      CM.Glyphs.Dot
-  }
+  1┤{CM.Glyphs.Dot}
    │ 
-  0┼┬┬┬┬{
-      CM.Glyphs.Dot
-  }┬
+  0┼┬┬┬┬{CM.Glyphs.Dot}┬
    0    5
          
           ";
@@ -1607,18 +1615,15 @@ public class PathAnnotationTests
         gv.MarginLeft = 1;
 
         gv.LayoutSubviews ();
+        gv.SetNeedsDisplay ();
         gv.Draw ();
 
         var expected =
             @$"
  │
-1┤{
-    CM.Glyphs.Dot
-}
+1┤{CM.Glyphs.Dot}
  │ 
-0┼┬┬┬┬{
-    CM.Glyphs.Dot
-}┬┬┬
+0┼┬┬┬┬{CM.Glyphs.Dot}┬┬┬
  0    5   
           
           ";