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 
17 package com.android.incallui.widget.multiwaveview;
18 
19 import android.graphics.Canvas;
20 import android.graphics.Color;
21 import android.graphics.Paint;
22 import android.graphics.drawable.Drawable;
23 import android.util.Log;
24 
25 import java.util.ArrayList;
26 
27 public class PointCloud {
28     private static final float MIN_POINT_SIZE = 2.0f;
29     private static final float MAX_POINT_SIZE = 4.0f;
30     private static final int INNER_POINTS = 8;
31     private static final String TAG = "PointCloud";
32     private ArrayList<Point> mPointCloud = new ArrayList<Point>();
33     private Drawable mDrawable;
34     private float mCenterX;
35     private float mCenterY;
36     private Paint mPaint;
37     private float mScale = 1.0f;
38     private static final float PI = (float) Math.PI;
39 
40     // These allow us to have multiple concurrent animations.
41     WaveManager waveManager = new WaveManager();
42     GlowManager glowManager = new GlowManager();
43     private float mOuterRadius;
44 
45     public class WaveManager {
46         private float radius = 50;
47         private float width = 200.0f; // TODO: Make configurable
48         private float alpha = 0.0f;
setRadius(float r)49         public void setRadius(float r) {
50             radius = r;
51         }
52 
getRadius()53         public float getRadius() {
54             return radius;
55         }
56 
setAlpha(float a)57         public void setAlpha(float a) {
58             alpha = a;
59         }
60 
getAlpha()61         public float getAlpha() {
62             return alpha;
63         }
64     };
65 
66     public class GlowManager {
67         private float x;
68         private float y;
69         private float radius = 0.0f;
70         private float alpha = 0.0f;
71 
setX(float x1)72         public void setX(float x1) {
73             x = x1;
74         }
75 
getX()76         public float getX() {
77             return x;
78         }
79 
setY(float y1)80         public void setY(float y1) {
81             y = y1;
82         }
83 
getY()84         public float getY() {
85             return y;
86         }
87 
setAlpha(float a)88         public void setAlpha(float a) {
89             alpha = a;
90         }
91 
getAlpha()92         public float getAlpha() {
93             return alpha;
94         }
95 
setRadius(float r)96         public void setRadius(float r) {
97             radius = r;
98         }
99 
getRadius()100         public float getRadius() {
101             return radius;
102         }
103     }
104 
105     class Point {
106         float x;
107         float y;
108         float radius;
109 
Point(float x2, float y2, float r)110         public Point(float x2, float y2, float r) {
111             x = (float) x2;
112             y = (float) y2;
113             radius = r;
114         }
115     }
116 
PointCloud(Drawable drawable)117     public PointCloud(Drawable drawable) {
118         mPaint = new Paint();
119         mPaint.setFilterBitmap(true);
120         mPaint.setColor(Color.rgb(255, 255, 255)); // TODO: make configurable
121         mPaint.setAntiAlias(true);
122         mPaint.setDither(true);
123 
124         mDrawable = drawable;
125         if (mDrawable != null) {
126             drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
127         }
128     }
129 
setCenter(float x, float y)130     public void setCenter(float x, float y) {
131         mCenterX = x;
132         mCenterY = y;
133     }
134 
makePointCloud(float innerRadius, float outerRadius)135     public void makePointCloud(float innerRadius, float outerRadius) {
136         if (innerRadius == 0) {
137             Log.w(TAG, "Must specify an inner radius");
138             return;
139         }
140         mOuterRadius = outerRadius;
141         mPointCloud.clear();
142         final float pointAreaRadius =  (outerRadius - innerRadius);
143         final float ds = (2.0f * PI * innerRadius / INNER_POINTS);
144         final int bands = (int) Math.round(pointAreaRadius / ds);
145         final float dr = pointAreaRadius / bands;
146         float r = innerRadius;
147         for (int b = 0; b <= bands; b++, r += dr) {
148             float circumference = 2.0f * PI * r;
149             final int pointsInBand = (int) (circumference / ds);
150             float eta = PI/2.0f;
151             float dEta = 2.0f * PI / pointsInBand;
152             for (int i = 0; i < pointsInBand; i++) {
153                 float x = r * (float) Math.cos(eta);
154                 float y = r * (float) Math.sin(eta);
155                 eta += dEta;
156                 mPointCloud.add(new Point(x, y, r));
157             }
158         }
159     }
160 
setScale(float scale)161     public void setScale(float scale) {
162         mScale  = scale;
163     }
164 
getScale()165     public float getScale() {
166         return mScale;
167     }
168 
hypot(float x, float y)169     private static float hypot(float x, float y) {
170         return (float) Math.hypot(x, y);
171     }
172 
max(float a, float b)173     private static float max(float a, float b) {
174         return a > b ? a : b;
175     }
176 
getAlphaForPoint(Point point)177     public int getAlphaForPoint(Point point) {
178         // Contribution from positional glow
179         float glowDistance = hypot(glowManager.x - point.x, glowManager.y - point.y);
180         float glowAlpha = 0.0f;
181 
182         if (glowDistance < glowManager.radius) {
183             double cos = Math.cos(Math.PI * 0.25d * glowDistance / glowManager.radius);
184             glowAlpha = glowManager.alpha * max(0.0f, (float) Math.pow(cos, 10.0d));
185         }
186 
187         // Compute contribution from Wave
188         float radius = hypot(point.x, point.y);
189         float distanceToWaveRing = (radius - waveManager.radius);
190         float waveAlpha = 0.0f;
191         if (distanceToWaveRing < waveManager.width * 0.5f && distanceToWaveRing < 0.0f) {
192             double cos = Math.cos(Math.PI * 0.25d * distanceToWaveRing / waveManager.width);
193             waveAlpha = waveManager.alpha * max(0.0f, (float) Math.pow(cos, 20.0d));
194         }
195 
196         return (int) (max(glowAlpha, waveAlpha) * 255);
197     }
198 
interp(float min, float max, float f)199     private float interp(float min, float max, float f) {
200         return min + (max - min) * f;
201     }
202 
draw(Canvas canvas)203     public void draw(Canvas canvas) {
204         ArrayList<Point> points = mPointCloud;
205         canvas.save(Canvas.MATRIX_SAVE_FLAG);
206         canvas.scale(mScale, mScale, mCenterX, mCenterY);
207         for (int i = 0; i < points.size(); i++) {
208             Point point = points.get(i);
209             final float pointSize = interp(MAX_POINT_SIZE, MIN_POINT_SIZE,
210                     point.radius / mOuterRadius);
211             final float px = point.x + mCenterX;
212             final float py = point.y + mCenterY;
213             int alpha = getAlphaForPoint(point);
214 
215             if (alpha == 0) continue;
216 
217             if (mDrawable != null) {
218                 canvas.save(Canvas.MATRIX_SAVE_FLAG);
219                 final float cx = mDrawable.getIntrinsicWidth() * 0.5f;
220                 final float cy = mDrawable.getIntrinsicHeight() * 0.5f;
221                 final float s = pointSize / MAX_POINT_SIZE;
222                 canvas.scale(s, s, px, py);
223                 canvas.translate(px - cx, py - cy);
224                 mDrawable.setAlpha(alpha);
225                 mDrawable.draw(canvas);
226                 canvas.restore();
227             } else {
228                 mPaint.setAlpha(alpha);
229                 canvas.drawCircle(px, py, pointSize, mPaint);
230             }
231         }
232         canvas.restore();
233     }
234 
235 }
236