1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.gallery3d.filtershow.imageshow;
18
19import android.content.Context;
20import android.graphics.Canvas;
21import android.graphics.Color;
22import android.graphics.Matrix;
23import android.graphics.Paint;
24import android.graphics.RadialGradient;
25import android.graphics.Rect;
26import android.graphics.RectF;
27import android.graphics.Shader;
28import android.util.Log;
29
30import com.android.gallery3d.R;
31
32public class EclipseControl {
33    private float mCenterX = Float.NaN;
34    private float mCenterY = 0;
35    private float mRadiusX = 200;
36    private float mRadiusY = 300;
37    private static int MIN_TOUCH_DIST = 80;// should be a resource & in dips
38    private static String LOGTAG = "EclipseControl";
39    private float[] handlex = new float[9];
40    private float[] handley = new float[9];
41    private int mSliderColor;
42    private int mCenterDotSize = 40;
43    private float mDownX;
44    private float mDownY;
45    private float mDownCenterX;
46    private float mDownCenterY;
47    private float mDownRadiusX;
48    private float mDownRadiusY;
49    private Matrix mScrToImg;
50
51    private boolean mShowReshapeHandles = true;
52    public final static int HAN_CENTER = 0;
53    public final static int HAN_NORTH = 7;
54    public final static int HAN_NE = 8;
55    public final static int HAN_EAST = 1;
56    public final static int HAN_SE = 2;
57    public final static int HAN_SOUTH = 3;
58    public final static int HAN_SW = 4;
59    public final static int HAN_WEST = 5;
60    public final static int HAN_NW = 6;
61    private Rect mImageBounds;
62
63    public EclipseControl(Context context) {
64        mSliderColor = Color.WHITE;
65    }
66
67    public void setRadius(float x, float y) {
68        mRadiusX = x;
69        mRadiusY = y;
70    }
71
72    public void setCenter(float x, float y) {
73        mCenterX = x;
74        mCenterY = y;
75    }
76
77    public int getCloseHandle(float x, float y) {
78        float min = Float.MAX_VALUE;
79        int handle = -1;
80        for (int i = 0; i < handlex.length; i++) {
81            float dx = handlex[i] - x;
82            float dy = handley[i] - y;
83            float dist = dx * dx + dy * dy;
84            if (dist < min) {
85                min = dist;
86                handle = i;
87            }
88        }
89
90        if (min < MIN_TOUCH_DIST * MIN_TOUCH_DIST) {
91            return handle;
92        }
93        for (int i = 0; i < handlex.length; i++) {
94            float dx = handlex[i] - x;
95            float dy = handley[i] - y;
96            float dist = (float) Math.sqrt(dx * dx + dy * dy);
97        }
98
99        return -1;
100    }
101
102    public void setScrImageInfo(Matrix scrToImg, Rect imageBounds) {
103        mScrToImg = scrToImg;
104        mImageBounds = new Rect(imageBounds);
105    }
106
107    private boolean centerIsOutside(float x1, float y1) {
108        return (!mImageBounds.contains((int) x1, (int) y1));
109    }
110
111    public void actionDown(float x, float y, Oval oval)  {
112        float[] point = new float[]{
113                x, y};
114        mScrToImg.mapPoints(point);
115        mDownX = point[0];
116        mDownY = point[1];
117        mDownCenterX = oval.getCenterX();
118        mDownCenterY = oval.getCenterY();
119        mDownRadiusX = oval.getRadiusX();
120        mDownRadiusY = oval.getRadiusY();
121    }
122
123
124    public void actionMove(int handle, float x, float y, Oval oval) {
125        float[] point = new float[]{
126                x, y};
127        mScrToImg.mapPoints(point);
128        x = point[0];
129        y = point[1];
130
131        // Test if the matrix is swapping x and y
132        point[0] = 0;
133        point[1] = 1;
134        mScrToImg.mapVectors(point);
135        boolean swapxy = (point[0] > 0.0f);
136
137        int sign = 1;
138        switch (handle) {
139            case HAN_CENTER:
140                float ctrdx = mDownX - mDownCenterX;
141                float ctrdy = mDownY - mDownCenterY;
142                if (centerIsOutside(x - ctrdx, y - ctrdy)) {
143                    break;
144                }
145                oval.setCenter((x - ctrdx), (y - ctrdy));
146                // setRepresentation(mVignetteRep);
147                break;
148            case HAN_NORTH:
149                sign = -1;
150            case HAN_SOUTH:
151                if (swapxy) {
152                    float raddx = mDownRadiusY - Math.abs(mDownX - mDownCenterY);
153                    oval.setRadiusY(Math.abs(x - oval.getCenterY() + sign * raddx));
154                } else {
155                    float raddy = mDownRadiusY - Math.abs(mDownY - mDownCenterY);
156                    oval.setRadiusY(Math.abs(y - oval.getCenterY() + sign * raddy));
157                }
158                break;
159            case HAN_EAST:
160                sign = -1;
161            case HAN_WEST:
162                if (swapxy) {
163                    float raddy = mDownRadiusX - Math.abs(mDownY - mDownCenterX);
164                    oval.setRadiusX(Math.abs(y - oval.getCenterX() + sign * raddy));
165                } else {
166                    float raddx = mDownRadiusX - Math.abs(mDownX - mDownCenterX);
167                    oval.setRadiusX(Math.abs(x - oval.getCenterX() -  sign * raddx));
168                }
169                break;
170            case HAN_SE:
171            case HAN_NE:
172            case HAN_SW:
173            case HAN_NW:
174                float sin45 = (float) Math.sin(45);
175                float dr = (mDownRadiusX + mDownRadiusY) * sin45;
176                float ctr_dx = mDownX - mDownCenterX;
177                float ctr_dy = mDownY - mDownCenterY;
178                float downRad = Math.abs(ctr_dx) + Math.abs(ctr_dy) - dr;
179                float rx = oval.getRadiusX();
180                float ry = oval.getRadiusY();
181                float r = (Math.abs(rx) + Math.abs(ry)) * sin45;
182                float dx = x - oval.getCenterX();
183                float dy = y - oval.getCenterY();
184                float nr = Math.abs(Math.abs(dx) + Math.abs(dy) - downRad);
185                oval.setRadius((rx * nr / r), (ry * nr / r));
186
187                break;
188        }
189    }
190
191    public void paintGrayPoint(Canvas canvas, float x, float y) {
192        if (Float.isNaN(x)) {
193            return;
194        }
195
196        Paint paint = new Paint();
197
198        paint.setStyle(Paint.Style.FILL);
199        paint.setColor(Color.BLUE);
200        int[] colors3 = new int[]{
201                Color.GRAY, Color.LTGRAY, 0x66000000, 0};
202        RadialGradient g = new RadialGradient(x, y, mCenterDotSize, colors3, new float[]{
203                0, .3f, .31f, 1}, Shader.TileMode.CLAMP);
204        paint.setShader(g);
205        canvas.drawCircle(x, y, mCenterDotSize, paint);
206    }
207
208    public void paintPoint(Canvas canvas, float x, float y) {
209        if (Float.isNaN(x)) {
210            return;
211        }
212
213        Paint paint = new Paint();
214
215        paint.setStyle(Paint.Style.FILL);
216        paint.setColor(Color.BLUE);
217        int[] colors3 = new int[]{
218                mSliderColor, mSliderColor, 0x66000000, 0};
219        RadialGradient g = new RadialGradient(x, y, mCenterDotSize, colors3, new float[]{
220                0, .3f, .31f, 1}, Shader.TileMode.CLAMP);
221        paint.setShader(g);
222        canvas.drawCircle(x, y, mCenterDotSize, paint);
223    }
224
225    void paintRadius(Canvas canvas, float cx, float cy, float rx, float ry) {
226        if (Float.isNaN(cx)) {
227            return;
228        }
229        int mSliderColor = 0xFF33B5E5;
230        Paint paint = new Paint();
231        RectF rect = new RectF(cx - rx, cy - ry, cx + rx, cy + ry);
232        paint.setAntiAlias(true);
233        paint.setStyle(Paint.Style.STROKE);
234        paint.setStrokeWidth(6);
235        paint.setColor(Color.BLACK);
236        paintOvallines(canvas, rect, paint, cx, cy, rx, ry);
237
238        paint.setStrokeWidth(3);
239        paint.setColor(Color.WHITE);
240        paintOvallines(canvas, rect, paint, cx, cy, rx, ry);
241    }
242
243    public void paintOvallines(
244            Canvas canvas, RectF rect, Paint paint, float cx, float cy, float rx, float ry) {
245        canvas.drawOval(rect, paint);
246        float da = 4;
247        float arclen = da + da;
248        if (mShowReshapeHandles) {
249            paint.setStyle(Paint.Style.STROKE);
250
251            for (int i = 0; i < 361; i += 90) {
252                float dx = rx + 10;
253                float dy = ry + 10;
254                rect.left = cx - dx;
255                rect.top = cy - dy;
256                rect.right = cx + dx;
257                rect.bottom = cy + dy;
258                canvas.drawArc(rect, i - da, arclen, false, paint);
259                dx = rx - 10;
260                dy = ry - 10;
261                rect.left = cx - dx;
262                rect.top = cy - dy;
263                rect.right = cx + dx;
264                rect.bottom = cy + dy;
265                canvas.drawArc(rect, i - da, arclen, false, paint);
266            }
267        }
268        da *= 2;
269        paint.setStyle(Paint.Style.FILL);
270
271        for (int i = 45; i < 361; i += 90) {
272            double angle = Math.PI * i / 180.;
273            float x = cx + (float) (rx * Math.cos(angle));
274            float y = cy + (float) (ry * Math.sin(angle));
275            canvas.drawRect(x - da, y - da, x + da, y + da, paint);
276        }
277        paint.setStyle(Paint.Style.STROKE);
278        rect.left = cx - rx;
279        rect.top = cy - ry;
280        rect.right = cx + rx;
281        rect.bottom = cy + ry;
282    }
283
284    public void fillHandles(Canvas canvas, float cx, float cy, float rx, float ry) {
285        handlex[0] = cx;
286        handley[0] = cy;
287        int k = 1;
288
289        for (int i = 0; i < 360; i += 45) {
290            double angle = Math.PI * i / 180.;
291
292            float x = cx + (float) (rx * Math.cos(angle));
293            float y = cy + (float) (ry * Math.sin(angle));
294            handlex[k] = x;
295            handley[k] = y;
296
297            k++;
298        }
299    }
300
301    public void draw(Canvas canvas) {
302        paintRadius(canvas, mCenterX, mCenterY, mRadiusX, mRadiusY);
303        fillHandles(canvas, mCenterX, mCenterY, mRadiusX, mRadiusY);
304        paintPoint(canvas, mCenterX, mCenterY);
305    }
306
307    public boolean isUndefined() {
308        return Float.isNaN(mCenterX);
309    }
310
311    public void setShowReshapeHandles(boolean showReshapeHandles) {
312        this.mShowReshapeHandles = showReshapeHandles;
313    }
314}
315