1 files changed, 101 insertions, 0 deletions
diff --git a/src/com/android/camera/ui/focus/AutoFocusRing.java b/src/com/android/camera/ui/focus/AutoFocusRing.java
new file mode 100644
index 000000000..ff09ebc65
--- /dev/null
+++ b/src/com/android/camera/ui/focus/AutoFocusRing.java
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.camera.ui.focus;
+
+import android.graphics.Canvas;
+import android.graphics.Paint;
+
+import com.android.camera.ui.motion.InterpolateUtils;
+import com.android.camera.ui.motion.Invalidator;
+
+/**
+ * Passive focus ring animation renderer.
+ */
+class AutoFocusRing extends FocusRingRenderer {
+    private static final String TAG = "AutoFocusRing";
+
+    /**
+     * The auto focus ring encapsulates the animation logic for visualizing
+     * a focus event when triggered by the camera subsystem.
+     *
+     * @param invalidator the object to invalidate while running.
+     * @param ringPaint the paint to draw the ring with.
+     * @param enterDurationMillis the fade in time in milliseconds.
+     * @param exitDurationMillis the fade out time in milliseconds.
+     */
+    public AutoFocusRing(Invalidator invalidator, Paint ringPaint, float enterDurationMillis,
+          float exitDurationMillis) {
+        super(invalidator, ringPaint, enterDurationMillis, exitDurationMillis);
+    }
+
+    @Override
+    public void draw(long t, long dt, Canvas canvas) {
+        float ringRadius = mRingRadius.update(dt);
+        processStates(t);
+
+        if (!isActive()) {
+            return;
+        }
+
+        mInvalidator.invalidate();
+        int ringAlpha = 255;
+
+        if (mFocusState == FocusState.STATE_ENTER) {
+            float rFade = InterpolateUtils.unitRatio(t, mEnterStartMillis, mEnterDurationMillis);
+            ringAlpha = (int) InterpolateUtils
+                  .lerp(0, 255, mEnterOpacityCurve.valueAt(rFade));
+        } else if (mFocusState == FocusState.STATE_FADE_OUT) {
+            float rFade = InterpolateUtils.unitRatio(t, mExitStartMillis, mExitDurationMillis);
+            ringAlpha = (int) InterpolateUtils
+                  .lerp(255, 0, mExitOpacityCurve.valueAt(rFade));
+        } else if (mFocusState == FocusState.STATE_HARD_STOP) {
+            float rFade = InterpolateUtils
+                  .unitRatio(t, mHardExitStartMillis, mHardExitDurationMillis);
+            ringAlpha = (int) InterpolateUtils
+                  .lerp(255, 0, mExitOpacityCurve.valueAt(rFade));
+        } else if (mFocusState == FocusState.STATE_INACTIVE) {
+            ringAlpha = 0;
+        }
+
+        mRingPaint.setAlpha(ringAlpha);
+        canvas.drawCircle(getCenterX(), getCenterY(), ringRadius, mRingPaint);
+    }
+
+    private void processStates(long t) {
+        if (mFocusState == FocusState.STATE_INACTIVE) {
+            return;
+        }
+
+        if (mFocusState == FocusState.STATE_ENTER && t > mEnterStartMillis + mEnterDurationMillis) {
+            mFocusState = FocusState.STATE_ACTIVE;
+        }
+
+        if (mFocusState == FocusState.STATE_ACTIVE && !mRingRadius.isActive()) {
+            mFocusState = FocusState.STATE_FADE_OUT;
+            mExitStartMillis = t;
+        }
+
+        if (mFocusState == FocusState.STATE_FADE_OUT && t > mExitStartMillis + mExitDurationMillis) {
+            mFocusState = FocusState.STATE_INACTIVE;
+        }
+
+        if (mFocusState == FocusState.STATE_HARD_STOP
+              && t > mHardExitStartMillis + mHardExitDurationMillis) {
+            mFocusState = FocusState.STATE_INACTIVE;
+        }
+    }
+}