1 files changed, 341 insertions, 0 deletions
diff --git a/core/java/android/gesture/Gesture.java b/core/java/android/gesture/Gesture.java
new file mode 100755
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--- /dev/null
+++ b/core/java/android/gesture/Gesture.java
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+/*
+ * Copyright (C) 2008-2009 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 android.gesture;
+
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.graphics.Path;
+import android.graphics.RectF;
+import android.os.Parcel;
+import android.os.Parcelable;
+import android.util.Log;
+
+import java.io.IOException;
+import java.io.DataOutputStream;
+import java.io.DataInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.ByteArrayInputStream;
+import java.util.ArrayList;
+
+/**
+ * A gesture can have a single or multiple strokes
+ */
+
+public class Gesture implements Parcelable {
+    private static final long GESTURE_ID_BASE = System.currentTimeMillis();
+
+    private static final int BITMAP_RENDERING_WIDTH = 2;
+
+    private static final boolean BITMAP_RENDERING_ANTIALIAS = true;
+    private static final boolean BITMAP_RENDERING_DITHER = true;
+
+    private static int sGestureCount = 0;
+
+    private final RectF mBoundingBox = new RectF();
+
+    // the same as its instance ID
+    private long mGestureID;
+
+    private final ArrayList<GestureStroke> mStrokes = new ArrayList<GestureStroke>();
+
+    public Gesture() {
+        mGestureID = GESTURE_ID_BASE + sGestureCount++;
+    }
+
+    void recycle() {
+        mStrokes.clear();
+        mBoundingBox.setEmpty();
+    }
+
+    /**
+     * @return all the strokes of the gesture
+     */
+    public ArrayList<GestureStroke> getStrokes() {
+        return mStrokes;
+    }
+
+    /**
+     * @return the number of strokes included by this gesture
+     */
+    public int getStrokesCount() {
+        return mStrokes.size();
+    }
+
+    /**
+     * Add a stroke to the gesture
+     * 
+     * @param stroke
+     */
+    public void addStroke(GestureStroke stroke) {
+        mStrokes.add(stroke);
+        mBoundingBox.union(stroke.boundingBox);
+    }
+
+    /**
+     * Get the total length of the gesture. When there are multiple strokes in
+     * the gesture, this returns the sum of the lengths of all the strokes
+     * 
+     * @return the length of the gesture
+     */
+    public float getLength() {
+        int len = 0;
+        final ArrayList<GestureStroke> strokes = mStrokes;
+        final int count = strokes.size();
+
+        for (int i = 0; i < count; i++) {
+            len += strokes.get(i).length;
+        }
+
+        return len;
+    }
+
+    /**
+     * @return the bounding box of the gesture
+     */
+    public RectF getBoundingBox() {
+        return mBoundingBox;
+    }
+
+    public Path toPath() {
+        return toPath(null);
+    }
+
+    public Path toPath(Path path) {
+        if (path == null) path = new Path();
+
+        final ArrayList<GestureStroke> strokes = mStrokes;
+        final int count = strokes.size();
+
+        for (int i = 0; i < count; i++) {
+            path.addPath(strokes.get(i).getPath());
+        }
+
+        return path;
+    }
+
+    public Path toPath(int width, int height, int edge, int numSample) {
+        return toPath(null, width, height, edge, numSample);
+    }
+
+    public Path toPath(Path path, int width, int height, int edge, int numSample) {
+        if (path == null) path = new Path();
+
+        final ArrayList<GestureStroke> strokes = mStrokes;
+        final int count = strokes.size();
+
+        for (int i = 0; i < count; i++) {
+            path.addPath(strokes.get(i).toPath(width - 2 * edge, height - 2 * edge, numSample));
+        }
+
+        return path;
+    }
+
+    /**
+     * Set the id of the gesture
+     * 
+     * @param id
+     */
+    void setID(long id) {
+        mGestureID = id;
+    }
+
+    /**
+     * @return the id of the gesture
+     */
+    public long getID() {
+        return mGestureID;
+    }
+
+    /**
+     * draw the gesture
+     * 
+     * @param canvas
+     */
+    void draw(Canvas canvas, Paint paint) {
+        final ArrayList<GestureStroke> strokes = mStrokes;
+        final int count = strokes.size();
+
+        for (int i = 0; i < count; i++) {
+            strokes.get(i).draw(canvas, paint);
+        }
+    }
+
+    /**
+     * Create a bitmap of the gesture with a transparent background
+     * 
+     * @param width width of the target bitmap
+     * @param height height of the target bitmap
+     * @param edge the edge
+     * @param numSample
+     * @param color
+     * @return the bitmap
+     */
+    public Bitmap toBitmap(int width, int height, int edge, int numSample, int color) {
+        final Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
+        final Canvas canvas = new Canvas(bitmap);
+
+        canvas.translate(edge, edge);
+
+        final Paint paint = new Paint();
+        paint.setAntiAlias(BITMAP_RENDERING_ANTIALIAS);
+        paint.setDither(BITMAP_RENDERING_DITHER);
+        paint.setColor(color);
+        paint.setStyle(Paint.Style.STROKE);
+        paint.setStrokeJoin(Paint.Join.ROUND);
+        paint.setStrokeCap(Paint.Cap.ROUND);
+        paint.setStrokeWidth(BITMAP_RENDERING_WIDTH);
+
+        final ArrayList<GestureStroke> strokes = mStrokes;
+        final int count = strokes.size();
+
+        for (int i = 0; i < count; i++) {
+            Path path = strokes.get(i).toPath(width - 2 * edge, height - 2 * edge, numSample);
+            canvas.drawPath(path, paint);
+        }
+
+        return bitmap;
+    }
+
+    /**
+     * Create a bitmap of the gesture with a transparent background
+     * 
+     * @param width
+     * @param height
+     * @param inset
+     * @param color
+     * @return the bitmap
+     */
+    public Bitmap toBitmap(int width, int height, int inset, int color) {
+        final Bitmap bitmap = Bitmap.createBitmap(width, height,
+                Bitmap.Config.ARGB_8888);
+        final Canvas canvas = new Canvas(bitmap);
+
+        final Paint paint = new Paint();
+        paint.setAntiAlias(BITMAP_RENDERING_ANTIALIAS);
+        paint.setDither(BITMAP_RENDERING_DITHER);
+        paint.setColor(color);
+        paint.setStyle(Paint.Style.STROKE);
+        paint.setStrokeJoin(Paint.Join.ROUND);
+        paint.setStrokeCap(Paint.Cap.ROUND);
+        paint.setStrokeWidth(BITMAP_RENDERING_WIDTH);
+
+        final Path path = toPath();
+        final RectF bounds = new RectF();
+        path.computeBounds(bounds, true);
+
+        final float sx = (width - 2 * inset) / bounds.width();
+        final float sy = (height - 2 * inset) / bounds.height();
+        final float scale = sx > sy ? sy : sx;
+        paint.setStrokeWidth(2.0f / scale);
+
+        path.offset(-bounds.left + (width - bounds.width() * scale) / 2.0f,
+                -bounds.top + (height - bounds.height() * scale) / 2.0f);
+
+        canvas.translate(inset, inset);
+        canvas.scale(scale, scale);
+
+        canvas.drawPath(path, paint);
+
+        return bitmap;
+    }
+
+    void serialize(DataOutputStream out) throws IOException {
+        final ArrayList<GestureStroke> strokes = mStrokes;
+        final int count = strokes.size();
+
+        // Write gesture ID
+        out.writeLong(mGestureID);
+        // Write number of strokes
+        out.writeInt(count);
+
+        for (int i = 0; i < count; i++) {
+            strokes.get(i).serialize(out);
+        }
+    }
+
+    static Gesture deserialize(DataInputStream in) throws IOException {
+        final Gesture gesture = new Gesture();
+
+        // Gesture ID
+        gesture.mGestureID = in.readLong();
+        // Number of strokes
+        final int count = in.readInt();
+
+        for (int i = 0; i < count; i++) {
+            gesture.addStroke(GestureStroke.deserialize(in));
+        }
+
+        return gesture;
+    }
+
+    public static final Parcelable.Creator<Gesture> CREATOR = new Parcelable.Creator<Gesture>() {
+        public Gesture createFromParcel(Parcel in) {
+            Gesture gesture = null;
+            final long gestureID = in.readLong();
+
+            final DataInputStream inStream = new DataInputStream(
+                    new ByteArrayInputStream(in.createByteArray()));
+
+            try {
+                gesture = deserialize(inStream);
+            } catch (IOException e) {
+                Log.e(GestureConstants.LOG_TAG, "Error reading Gesture from parcel:", e);
+            } finally {
+                GestureUtilities.closeStream(inStream);
+            }
+
+            if (gesture != null) {
+                gesture.mGestureID = gestureID;
+            }
+
+            return gesture;
+        }
+
+        public Gesture[] newArray(int size) {
+            return new Gesture[size];
+        }
+    };
+
+    public void writeToParcel(Parcel out, int flags) {
+        out.writeLong(mGestureID);
+
+        boolean result = false;
+        final ByteArrayOutputStream byteStream =
+                new ByteArrayOutputStream(GestureConstants.IO_BUFFER_SIZE);
+        final DataOutputStream outStream = new DataOutputStream(byteStream);
+
+        try {
+            serialize(outStream);
+            result = true;
+        } catch (IOException e) {
+            Log.e(GestureConstants.LOG_TAG, "Error writing Gesture to parcel:", e);
+        } finally {
+            GestureUtilities.closeStream(outStream);
+            GestureUtilities.closeStream(byteStream);
+        }
+
+        if (result) {
+            out.writeByteArray(byteStream.toByteArray());
+        }
+    }
+
+    public int describeContents() {
+        return 0;
+    }
+}
+