wip

diff --git a/src/com/owncloud/android/datamodel/ThumbnailsCacheManager.java b/src/com/owncloud/android/datamodel/ThumbnailsCacheManager.java
index ce60cfe..e3144a4 100644 (file)
--- a/src/com/owncloud/android/datamodel/ThumbnailsCacheManager.java
+++ b/src/com/owncloud/android/datamodel/ThumbnailsCacheManager.java
@@ -379,10 +379,10 @@ public class ThumbnailsCacheManager {
     }
 
     public static Bitmap addVideoOverlay(Bitmap thumbnail){
-        Bitmap bitmap2 = BitmapFactory.decodeResource(MainApp.getAppContext().getResources(),
-                                                          R.drawable.view_play);
+        Bitmap playButton = BitmapFactory.decodeResource(MainApp.getAppContext().getResources(),
+                R.drawable.view_play);
 
-        Bitmap resized = Bitmap.createScaledBitmap(bitmap2,
+        Bitmap resizedPlayButton = Bitmap.createScaledBitmap(playButton,
                 (int) (thumbnail.getWidth() * 0.6),
                 (int) (thumbnail.getHeight() * 0.6), true);
 
@@ -392,13 +392,29 @@ public class ThumbnailsCacheManager {
 
         Canvas c = new Canvas(resultBitmap);
 
+        // compute visual center of play button, according to resized image
+        int x1 = resizedPlayButton.getWidth();
+        int y1 = resizedPlayButton.getHeight() / 2;
+        int x2 = 0;
+        int y2 = resizedPlayButton.getWidth();
+        int x3 = 0;
+        int y3 = 0;
+
+        double ym = ( ((Math.pow(x3,2) - Math.pow(x1,2) + Math.pow(y3,2) - Math.pow(y1,2)) * (x2 - x1)) - (Math.pow(x2,2) - Math.pow(x1,2) + Math.pow(y2,2) - Math.pow(y1,2)) * (x3 - x1) )  /  (2 * ( ((y3 - y1) * (x2 - x1)) - ((y2 - y1) * (x3 - x1)) ));
+        double xm = ( (Math.pow(x2,2) - Math.pow(x1,2)) + (Math.pow(y2,2) - Math.pow(y1,2)) - (2*ym*(y2 - y1)) ) / (2*(x2 - x1));
+
+        // offset to top left
+        double ox = - xm;
+        double oy = thumbnail.getHeight() - ym;
+
+
         c.drawBitmap(thumbnail, 0, 0, null);
 
         Paint p = new Paint();
         p.setAlpha(230);
 
-        c.drawBitmap(resized, (thumbnail.getWidth() - resized.getWidth()) / 2,
-                (thumbnail.getHeight() - resized.getHeight()) / 2, p);
+        c.drawBitmap(resizedPlayButton, (float) ((thumbnail.getWidth() / 2) - ox),
+                                        (float) ((thumbnail.getHeight() / 2) + ym), p);
 
         return resultBitmap;
     }