JAL-1161 conditional parameters for controlling clipping

[jalview.git] / src / jalview / renderer / AnnotationRenderer.java

diff --git a/src/jalview/renderer/AnnotationRenderer.java b/src/jalview/renderer/AnnotationRenderer.java
index 7598f5f..fcdd77d 100644 (file)
--- a/src/jalview/renderer/AnnotationRenderer.java
+++ b/src/jalview/renderer/AnnotationRenderer.java
@@ -142,7 +142,22 @@ public class AnnotationRenderer
    * width of image to render in panel
    */
   private int imgWidth;
-
+  /**
+   * offset to beginning of visible area
+   */
+  private int sOffset;
+  /**
+   * offset to end of visible area
+   */
+  private int visHeight;
+  /**
+   * indicate if the renderer should only render the visible portion of the annotation given the current view settings
+   */
+  private boolean useClip=false;
+  /**
+   * master flag indicating if renderer should ever try to clip. not enabled for jalview 2.8.1 
+   */
+  private boolean canClip=false;
   // public void updateFromAnnotationPanel(FontMetrics annotFM, AlignViewportI
   // av)
   public void updateFromAwtRenderPanel(AwtRenderPanelI annotPanel,
@@ -152,6 +167,22 @@ public class AnnotationRenderer
     annotationPanel = annotPanel;
     fadedImage = annotPanel.getFadedImage();
     imgWidth = annotPanel.getFadedImageWidth();
+    // visible area for rendering
+    int[] bounds=annotPanel.getVisibleVRange();
+    if (bounds!=null)
+    {
+      sOffset = bounds[0];
+      visHeight = bounds[1];
+      if (visHeight==0)
+      {
+        useClip=false;
+      } else {
+        useClip=canClip;
+      }
+    } else {
+      useClip=false;
+    }
+
     updateFromAlignViewport(av);
   }
 
@@ -280,6 +311,9 @@ public class AnnotationRenderer
     // column.
     Font ofont = g.getFont();
     // \u03B2 \u03B1
+    // debug ints
+    int yfrom=0,f_i=0,yto=0,f_to=0;
+    boolean clipst=false,clipend=false;
     for (int i = 0; i < aa.length; i++)
     {
       AlignmentAnnotation row = aa[i];
@@ -293,6 +327,17 @@ public class AnnotationRenderer
       scaleColLabel = row.scaleColLabel;
       lastSS = ' ';
       lastSSX = 0;
+      
+      if (!useClip || ((y-charHeight)<visHeight && (y+row.height+charHeight*2)>=sOffset)) 
+      {// if_in_visible_region
+        if (!clipst)
+        {
+          clipst=true;
+          yfrom=y;
+          f_i=i;
+        }
+        yto = y;
+        f_to=i;
       if (row.graph > 0)
       {
         if (row.graphGroup > -1 && graphGroupDrawn.get(row.graphGroup)) {
@@ -617,7 +662,12 @@ public class AnnotationRenderer
                   row.graphMin, row.graphMax, y);
         }
       }
-
+    } else {
+      if (clipst && !clipend)
+      {
+        clipend = true;
+      }
+    }// end if_in_visible_region
       if (row.graph > 0 && row.hasText)
       {
         y += charHeight;
@@ -628,6 +678,20 @@ public class AnnotationRenderer
         y += aa[i].height;
       }
     }
+    if (canClip)
+    {
+      if (clipst)
+      {
+        System.err.println("Start clip at : " + yfrom + " (index " + f_i
+                + ")");
+      }
+      if (clipend)
+      {
+        System.err
+                .println("End clip at : " + yto + " (index " + f_to + ")");
+      }
+    }
+    ;
     return !usedFaded;
   }