SkAR Java: Animation support

Bug: skia:
Change-Id: Ia43ccd7d9969e5167e6cd6f561b2d6d604e700a1
Reviewed-on: https://skia-review.googlesource.com/141100
Reviewed-by: Mike Reed <reed@google.com>

2 files changed, 39 insertions, 0 deletions

diff --git a/platform_tools/android/apps/skar_java/src/main/java/com/google/ar/core/examples/java/helloskar/DrawManager.java b/platform_tools/android/apps/skar_java/src/main/java/com/google/ar/core/examples/java/helloskar/DrawManager.java
index 00243193cd..c448ffeb42 100644
--- a/platform_tools/android/apps/skar_java/src/main/java/com/google/ar/core/examples/java/helloskar/DrawManager.java
+++ b/platform_tools/android/apps/skar_java/src/main/java/com/google/ar/core/examples/java/helloskar/DrawManager.java
@@ -75,6 +75,22 @@ public class DrawManager {
         canvas.restore();
     }
 
+    // Sample function for drawing an animated round rect
+    public void drawAnimatedRoundRect(Canvas canvas, float radius) {
+        if (modelMatrices.isEmpty()) {
+            return;
+        }
+        Paint p = new Paint();
+        p.setColorFilter(lightFilter);
+        p.setARGB(180, 100, 0, 100);
+
+        canvas.save();
+        canvas.setMatrix(SkARMatrix.createPerspectiveMatrix(modelMatrices.get(0),
+                viewMatrix, projectionMatrix, viewportWidth, viewportHeight));
+        canvas.drawRoundRect(0,0, 0.5f, 0.5f, radius, radius, p);
+        canvas.restore();
+    }
+
     // Sample function for drawing a rect
     public void drawRect(Canvas canvas) {
         if (modelMatrices.isEmpty()) {
diff --git a/platform_tools/android/apps/skar_java/src/main/java/com/google/ar/core/examples/java/helloskar/HelloSkARActivity.java b/platform_tools/android/apps/skar_java/src/main/java/com/google/ar/core/examples/java/helloskar/HelloSkARActivity.java
index b2d3cfd534..7bd4085ff8 100644
--- a/platform_tools/android/apps/skar_java/src/main/java/com/google/ar/core/examples/java/helloskar/HelloSkARActivity.java
+++ b/platform_tools/android/apps/skar_java/src/main/java/com/google/ar/core/examples/java/helloskar/HelloSkARActivity.java
@@ -16,6 +16,8 @@
 
 package com.google.ar.core.examples.java.helloskar;
 
+import android.animation.PropertyValuesHolder;
+import android.animation.ValueAnimator;
 import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.PorterDuff;
@@ -94,6 +96,11 @@ public class HelloSkARActivity extends AppCompatActivity implements GLSurfaceVie
     // Anchors created from taps used for object placing.
     private final ArrayList<Anchor> anchors = new ArrayList<>();
 
+    // Animation fields
+    float radius;
+    String PROPERTY_RADIUS = "radius";
+    ValueAnimator animator;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -115,6 +122,21 @@ public class HelloSkARActivity extends AppCompatActivity implements GLSurfaceVie
         glSurfaceView.setRenderMode(GLSurfaceView.RENDERMODE_CONTINUOUSLY);
 
         installRequested = false;
+
+        // Animator set up
+        PropertyValuesHolder propertyRadius = PropertyValuesHolder.ofFloat(PROPERTY_RADIUS, 0, 0.5f);
+        animator = new ValueAnimator();
+        animator.setValues(propertyRadius);
+        animator.setDuration(1000);
+        animator.setRepeatCount(ValueAnimator.INFINITE);
+        animator.setRepeatMode(ValueAnimator.REVERSE);
+        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
+            @Override
+            public void onAnimationUpdate(ValueAnimator animation) {
+                radius = (float) animation.getAnimatedValue(PROPERTY_RADIUS);
+            }
+        });
+        animator.start();
     }
 
     @Override
@@ -359,6 +381,7 @@ public class HelloSkARActivity extends AppCompatActivity implements GLSurfaceVie
 
             drawManager.drawRect(canvas);
             drawManager.drawCircle(canvas);
+            drawManager.drawAnimatedRoundRect(canvas, radius);
             drawManager.drawText(canvas, "HelloSkAR");
         }
     }