From bf4ae898f0b9a725ccdc831cca1ad58258ad3c38 Mon Sep 17 00:00:00 2001
From: Sindhu Somasundaram <56774226+sindhuvahinis@users.noreply.github.com>
Date: Mon, 9 Sep 2024 18:09:43 -0700
Subject: [PATCH] add drawMarks to android BitMapImageFactory (#3460)

* add drawMarks to android BitMapImageFactory

* change signature of drawBoundingBoxes
---
 .../djl/android/core/BitmapImageFactory.java  | 36 ++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)

diff --git a/android/core/src/main/java/ai/djl/android/core/BitmapImageFactory.java b/android/core/src/main/java/ai/djl/android/core/BitmapImageFactory.java
index c208b6ae431..8142edfa5af 100644
--- a/android/core/src/main/java/ai/djl/android/core/BitmapImageFactory.java
+++ b/android/core/src/main/java/ai/djl/android/core/BitmapImageFactory.java
@@ -25,6 +25,7 @@
 import ai.djl.modality.cv.output.DetectedObjects;
 import ai.djl.modality.cv.output.Joints;
 import ai.djl.modality.cv.output.Mask;
+import ai.djl.modality.cv.output.Point;
 import ai.djl.modality.cv.output.Rectangle;
 import ai.djl.modality.cv.util.NDImageUtils;
 import ai.djl.ndarray.NDArray;
@@ -241,7 +242,7 @@ public List<BoundingBox> findBoundingBoxes() {
 
         /** {@inheritDoc} */
         @Override
-        public void drawBoundingBoxes(DetectedObjects detections) {
+        public void drawBoundingBoxes(DetectedObjects detections, float opacity) {
             Bitmap mutableBitmap = bitmap.copy(Bitmap.Config.ARGB_8888, true);
             Canvas canvas = new Canvas(mutableBitmap);
             // set the paint configure
@@ -282,6 +283,29 @@ public void drawBoundingBoxes(DetectedObjects detections) {
             oldBitmap.recycle();
         }
 
+        /** {@inheritDoc} */
+        @Override
+        public void drawMarks(List<Point> points, int radius) {
+            Bitmap mutableBitmap = bitmap.copy(Bitmap.Config.ARGB_8888, true);
+            Canvas canvas = new Canvas(mutableBitmap);
+
+            // set the paint configure
+            Paint paint = new Paint();
+            paint.setStrokeWidth(2);
+            paint.setStyle(Paint.Style.FILL);
+            paint.setAntiAlias(true);
+
+            paint.setColor(darker(randomColor()));
+            for (Point point : points) {
+                int[][] star = createStar(point, radius);
+                drawPolygon(canvas, paint, star);
+            }
+
+            Bitmap oldBitmap = bitmap;
+            bitmap = mutableBitmap;
+            oldBitmap.recycle();
+        }
+
         /** {@inheritDoc} */
         @Override
         public void drawJoints(Joints joints) {
@@ -395,5 +419,15 @@ private void drawMask(Bitmap image, Mask mask) {
             Canvas canvas = new Canvas(image);
             canvas.drawBitmap(maskedImage, x, y, null);
         }
+
+        private void drawPolygon(Canvas canvas, Paint paint, int[][] polygon) {
+            android.graphics.Path polygonPath = new android.graphics.Path();
+            polygonPath.moveTo(polygon[0][0], polygon[1][0]);
+            for (int i = 1; i < polygon[0].length; i++) {
+                polygonPath.lineTo(polygon[0][i], polygon[1][i]);
+            }
+            polygonPath.close();
+            canvas.drawPath(polygonPath, paint);
+        }
     }
 }