| /* |
| * 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.internal.widget.multiwaveview; |
| |
| import java.util.ArrayList; |
| |
| import android.graphics.Canvas; |
| import android.graphics.Color; |
| import android.graphics.Paint; |
| import android.graphics.drawable.Drawable; |
| import android.util.Log; |
| |
| public class PointCloud { |
| private static final float MIN_POINT_SIZE = 2.0f; |
| private static final float MAX_POINT_SIZE = 4.0f; |
| private static final int INNER_POINTS = 8; |
| private static final String TAG = "PointCloud"; |
| private ArrayList<Point> mPointCloud = new ArrayList<Point>(); |
| private Drawable mDrawable; |
| private float mCenterX; |
| private float mCenterY; |
| private Paint mPaint; |
| private float mScale = 1.0f; |
| private static final float PI = (float) Math.PI; |
| |
| // These allow us to have multiple concurrent animations. |
| WaveManager waveManager = new WaveManager(); |
| GlowManager glowManager = new GlowManager(); |
| private float mOuterRadius; |
| |
| public class WaveManager { |
| private float radius = 50; |
| private float alpha = 0.0f; |
| |
| public void setRadius(float r) { |
| radius = r; |
| } |
| |
| public float getRadius() { |
| return radius; |
| } |
| |
| public void setAlpha(float a) { |
| alpha = a; |
| } |
| |
| public float getAlpha() { |
| return alpha; |
| } |
| }; |
| |
| public class GlowManager { |
| private float x; |
| private float y; |
| private float radius = 0.0f; |
| private float alpha = 0.0f; |
| |
| public void setX(float x1) { |
| x = x1; |
| } |
| |
| public float getX() { |
| return x; |
| } |
| |
| public void setY(float y1) { |
| y = y1; |
| } |
| |
| public float getY() { |
| return y; |
| } |
| |
| public void setAlpha(float a) { |
| alpha = a; |
| } |
| |
| public float getAlpha() { |
| return alpha; |
| } |
| |
| public void setRadius(float r) { |
| radius = r; |
| } |
| |
| public float getRadius() { |
| return radius; |
| } |
| } |
| |
| class Point { |
| float x; |
| float y; |
| float radius; |
| |
| public Point(float x2, float y2, float r) { |
| x = (float) x2; |
| y = (float) y2; |
| radius = r; |
| } |
| } |
| |
| public PointCloud(Drawable drawable) { |
| mPaint = new Paint(); |
| mPaint.setFilterBitmap(true); |
| mPaint.setColor(Color.rgb(255, 255, 255)); // TODO: make configurable |
| mPaint.setAntiAlias(true); |
| mPaint.setDither(true); |
| |
| mDrawable = drawable; |
| if (mDrawable != null) { |
| drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight()); |
| } |
| } |
| |
| public void setCenter(float x, float y) { |
| mCenterX = x; |
| mCenterY = y; |
| } |
| |
| public void makePointCloud(float innerRadius, float outerRadius) { |
| if (innerRadius == 0) { |
| Log.w(TAG, "Must specify an inner radius"); |
| return; |
| } |
| mOuterRadius = outerRadius; |
| mPointCloud.clear(); |
| final float pointAreaRadius = (outerRadius - innerRadius); |
| final float ds = (2.0f * PI * innerRadius / INNER_POINTS); |
| final int bands = (int) Math.round(pointAreaRadius / ds); |
| final float dr = pointAreaRadius / bands; |
| float r = innerRadius; |
| for (int b = 0; b <= bands; b++, r += dr) { |
| float circumference = 2.0f * PI * r; |
| final int pointsInBand = (int) (circumference / ds); |
| float eta = PI/2.0f; |
| float dEta = 2.0f * PI / pointsInBand; |
| for (int i = 0; i < pointsInBand; i++) { |
| float x = r * (float) Math.cos(eta); |
| float y = r * (float) Math.sin(eta); |
| eta += dEta; |
| mPointCloud.add(new Point(x, y, r)); |
| } |
| } |
| } |
| |
| public void setScale(float scale) { |
| mScale = scale; |
| } |
| |
| public float getScale() { |
| return mScale; |
| } |
| |
| public int getAlphaForPoint(Point point) { |
| // Contribution from positional glow |
| float glowDistance = (float) Math.hypot(glowManager.x - point.x, glowManager.y - point.y); |
| float glowAlpha = 0.0f; |
| if (glowDistance < glowManager.radius) { |
| float cosf = (float) Math.cos(PI * 0.25f * glowDistance / glowManager.radius); |
| glowAlpha = glowManager.alpha * Math.max(0.0f, (float) Math.pow(cosf, 10.0f)); |
| } |
| |
| // Compute contribution from Wave |
| float radius = (float) Math.hypot(point.x, point.y); |
| float waveAlpha = 0.0f; |
| if (radius < waveManager.radius * 2) { |
| float distanceToWaveRing = (radius - waveManager.radius); |
| float cosf = (float) Math.cos(PI * 0.5f * distanceToWaveRing / waveManager.radius); |
| waveAlpha = waveManager.alpha * Math.max(0.0f, (float) Math.pow(cosf, 6.0f)); |
| } |
| return (int) (Math.max(glowAlpha, waveAlpha) * 255); |
| } |
| |
| private float interp(float min, float max, float f) { |
| return min + (max - min) * f; |
| } |
| |
| public void draw(Canvas canvas) { |
| ArrayList<Point> points = mPointCloud; |
| canvas.save(Canvas.MATRIX_SAVE_FLAG); |
| canvas.scale(mScale, mScale, mCenterX, mCenterY); |
| for (int i = 0; i < points.size(); i++) { |
| Point point = points.get(i); |
| final float pointSize = interp(MAX_POINT_SIZE, MIN_POINT_SIZE, |
| point.radius / mOuterRadius); |
| final float px = point.x + mCenterX; |
| final float py = point.y + mCenterY; |
| int alpha = getAlphaForPoint(point); |
| |
| if (alpha == 0) continue; |
| |
| if (mDrawable != null) { |
| canvas.save(Canvas.MATRIX_SAVE_FLAG); |
| final float cx = mDrawable.getIntrinsicWidth() * 0.5f; |
| final float cy = mDrawable.getIntrinsicHeight() * 0.5f; |
| final float s = pointSize / MAX_POINT_SIZE; |
| canvas.scale(s, s, px, py); |
| canvas.translate(px - cx, py - cy); |
| mDrawable.setAlpha(alpha); |
| mDrawable.draw(canvas); |
| canvas.restore(); |
| } else { |
| mPaint.setAlpha(alpha); |
| canvas.drawCircle(px, py, pointSize, mPaint); |
| } |
| } |
| canvas.restore(); |
| } |
| |
| } |