Adding Crop, Rotate, Flip.

Bug: 7224232
Bug: 7218935

Adding geometry manipulation UI features.

Change-Id: If924313c18121e6d192a1934e76691bd578d8eb0

1 files changed, 161 insertions, 0 deletions

diff --git a/src/com/android/gallery3d/filtershow/imageshow/ImageRotate.java b/src/com/android/gallery3d/filtershow/imageshow/ImageRotate.java
new file mode 100644
index 000000000..c0999e3d0
--- /dev/null
+++ b/src/com/android/gallery3d/filtershow/imageshow/ImageRotate.java
@@ -0,0 +1,161 @@
+/*
+ * Copyright (C) 2012 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.gallery3d.filtershow.imageshow;
+
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Matrix;
+import android.graphics.Paint;
+import android.graphics.Path;
+import android.graphics.RectF;
+import android.util.AttributeSet;
+import android.util.Log;
+
+public class ImageRotate extends ImageGeometry {
+    private static final float MATH_PI = (float) Math.PI;
+
+    private float mBaseAngle = 0;
+    private float mAngle = 0;
+
+    private RectF mLocalBoundsCopy = null;
+    private boolean mSnapToNinety = true;
+    private static final String LOGTAG = "ImageRotate";
+
+    public ImageRotate(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public ImageRotate(Context context) {
+        super(context);
+    }
+
+    private float angleFor(float dx, float dy) {
+        return (float) (Math.atan2(dx, dy) * 180 / MATH_PI);
+    }
+
+    private int snappedAngle(float angle) {
+        float remainder = angle % 90;
+        int current = (int) (angle / 90); // truncates
+        if (remainder < -45) {
+            --current;
+        } else if (remainder > 45) {
+            ++current;
+        }
+        return current * 90;
+    }
+
+    private static final Paint gPaint = new Paint();
+
+    private void computeValue() {
+        if (mCurrentX == mTouchCenterX && mCurrentY == mTouchCenterY) {
+            return;
+        }
+        float dX1 = mTouchCenterX - mCenterX;
+        float dY1 = mTouchCenterY - mCenterY;
+        float dX2 = mCurrentX - mCenterX;
+        float dY2 = mCurrentY - mCenterY;
+
+        float angleA = angleFor(dX1, dY1);
+        float angleB = angleFor(dX2, dY2);
+        float angle = (angleB - angleA) % 360;
+        mAngle = (mBaseAngle - angle) % 360;
+    }
+
+    @Override
+    protected void setActionDown(float x, float y) {
+        super.setActionDown(x, y);
+        mBaseAngle = mAngle = getLocalRotation();
+    }
+
+    @Override
+    protected void setActionMove(float x, float y) {
+        super.setActionMove(x, y);
+        computeValue();
+        setLocalRotation(mAngle % 360);
+    }
+
+    @Override
+    protected void setActionUp() {
+        super.setActionUp();
+        if (mSnapToNinety) {
+            setLocalRotation(snappedAngle(mAngle % 360));
+        }
+    }
+
+    @Override
+    public void resetParameter() {
+        super.resetParameter();
+        mLocalBoundsCopy = getLocalCropBounds();
+    }
+
+    @Override
+    protected void gainedVisibility() {
+        mLocalBoundsCopy = getLocalCropBounds();
+    }
+
+    @Override
+    protected void lostVisibility() {
+    }
+
+    @Override
+    protected int getLocalValue() {
+        return (int) getLocalRotation();
+    }
+
+    @Override
+    protected void drawShape(Canvas canvas, Bitmap image) {
+        gPaint.setAntiAlias(true);
+        gPaint.setFilterBitmap(true);
+        gPaint.setDither(true);
+        gPaint.setARGB(255, 255, 255, 255);
+
+        drawRegularFlippedBitmap(canvas, image, gPaint);
+
+        RectF cropBounds = getCropBoundsDisplayed(mLocalBoundsCopy);
+
+        Matrix m0 = new Matrix();
+        m0.setRotate(getLocalRotation(), mCenterX, mCenterY);
+        float[] corners = getCornersFromRect(cropBounds);
+        m0.mapPoints(corners);
+
+        gPaint.setARGB(255, 255, 255, 255);
+        gPaint.setStrokeWidth(3);
+        gPaint.setStyle(Paint.Style.STROKE);
+        drawClosedPath(canvas, gPaint, corners);
+
+        canvas.save();
+        canvas.rotate(getLocalRotation(), mCenterX, mCenterY);
+        RectF displayRect = getLocalDisplayBounds();
+        float dWidth = displayRect.width();
+        float dHeight = displayRect.height();
+        RectF boundsRect = cropBounds;
+        gPaint.setARGB(128, 0, 0, 0);
+        // TODO: move style to xml
+        gPaint.setStyle(Paint.Style.FILL);
+        canvas.drawRect(0, 0, dWidth, boundsRect.top, gPaint);
+        canvas.drawRect(0, boundsRect.bottom, dWidth, dHeight, gPaint);
+        canvas.drawRect(0, boundsRect.top, boundsRect.left, boundsRect.bottom,
+                gPaint);
+        canvas.drawRect(boundsRect.right, boundsRect.top, dWidth,
+                boundsRect.bottom, gPaint);
+        canvas.rotate(-getLocalRotation(), mCenterX, mCenterY);
+        canvas.restore();
+
+    }
+
+}