Changeset 1979

Timestamp:

05/31/09 20:12:04 (15 years ago)

Author:

mstoeger

Message:

added bitmap-snapshot function.
fixed auto-zoom bug that caused a "zoom level too high" error when a data row contained only one value. #498

File:

• trunk/sources/HeuristicLab.Visualization/3.2/LineChart.cs (modified) (2 diffs)

trunk/sources/HeuristicLab.Visualization/3.2/LineChart.cs

@@ -72 +72 @@
       UpdateLayout();
       ZoomToFullView();
+    }
+
+    public Bitmap Snapshot() {
+      UpdateLayout();
+      Bitmap bmp = new Bitmap(Width, Height);
+      using (Graphics g = Graphics.FromImage(bmp)) {
+        canvas.Draw(g);
+      }
+      return bmp;
     }
 
@@ -392 +401 @@
 
       foreach (RowEntry rowEntry in rowEntries) {
-        YAxisDescriptor yAxisDescriptor = rowEntry.DataRow.YAxis;
-
-        SetClipY(rowEntry,
-                 yAxisDescriptor.MinValue - ((yAxisDescriptor.MaxValue - yAxisDescriptor.MinValue)*0.05),
-                 yAxisDescriptor.MaxValue + ((yAxisDescriptor.MaxValue - yAxisDescriptor.MinValue)*0.05));
+        YAxisDescriptor yAxis = rowEntry.DataRow.YAxis;
+
+        double padding = (yAxis.MaxValue - yAxis.MinValue)*0.05;
+
+        double ymin = yAxis.MinValue - padding;
+        double ymax = yAxis.MaxValue + padding;
+
+        if (Math.Abs(ymin-ymax) < double.Epsilon*5) {
+          ymin -= 0.1;
+          ymax += 0.1;
+        }
+
+        SetClipY(rowEntry, ymin, ymax);
       }