248 lines
7.4 KiB
Java
248 lines
7.4 KiB
Java
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package net.sebastianopoggi.ui.GlowPadBackport;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Paint;
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import android.graphics.drawable.Drawable;
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import android.util.FloatMath;
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import android.util.Log;
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import java.util.ArrayList;
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public class PointCloud {
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private static final float MIN_POINT_SIZE = 2.0f;
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private static final float MAX_POINT_SIZE = 4.0f;
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private static int INNER_POINTS = 8;
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private static final String TAG = "PointCloud";
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private ArrayList<Point> mPointCloud = new ArrayList<Point>();
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private Drawable mDrawable;
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private float mCenterX;
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private float mCenterY;
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private Paint mPaint;
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private float mScale = 1.0f;
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private static final float PI = (float) Math.PI;
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// These allow us to have multiple concurrent animations.
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WaveManager waveManager = new WaveManager();
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GlowManager glowManager = new GlowManager();
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private float mOuterRadius, mInnerRadius;
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public class WaveManager {
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private float radius = 50;
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private float width = 200.0f; // TODO: Make configurable
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private float alpha = 0.0f;
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public void setRadius(float r) {
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radius = r;
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}
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public float getRadius() {
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return radius;
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}
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public void setAlpha(float a) {
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alpha = a;
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}
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public float getAlpha() {
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return alpha;
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}
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}
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public class GlowManager {
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private float x;
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private float y;
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private float radius = 0.0f;
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private float alpha = 0.0f;
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public void setX(float x1) {
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x = x1;
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}
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public float getX() {
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return x;
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}
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public void setY(float y1) {
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y = y1;
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}
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public float getY() {
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return y;
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}
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public void setAlpha(float a) {
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alpha = a;
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}
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public float getAlpha() {
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return alpha;
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}
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public void setRadius(float r) {
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radius = r;
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}
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public float getRadius() {
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return radius;
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}
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}
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class Point {
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float x;
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float y;
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float radius;
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public Point(float x2, float y2, float r) {
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x = x2;
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y = y2;
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radius = r;
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}
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}
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public PointCloud(Drawable drawable) {
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mPaint = new Paint();
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mPaint.setFilterBitmap(true);
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mPaint.setColor(Color.rgb(255, 255, 255)); // TODO: make configurable
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mPaint.setAntiAlias(true);
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mPaint.setDither(true);
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mDrawable = drawable;
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if (mDrawable != null) {
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drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
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}
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}
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/*package*/ void setPointsMultiplier(int mult) {
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INNER_POINTS = mult;
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makePointCloud(mInnerRadius, mOuterRadius);
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}
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/*package*/ int getPointsMultiplier() {
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return INNER_POINTS;
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}
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public void setCenter(float x, float y) {
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mCenterX = x;
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mCenterY = y;
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}
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public void makePointCloud(float innerRadius, float outerRadius) {
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if (innerRadius == 0) {
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Log.w(TAG, "Must specify an inner radius");
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return;
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}
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mOuterRadius = outerRadius;
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mInnerRadius = innerRadius;
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mPointCloud.clear();
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final float pointAreaRadius = (outerRadius - innerRadius);
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final float ds = (2.0f * PI * innerRadius / INNER_POINTS);
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final int bands = Math.round(pointAreaRadius / ds);
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final float dr = pointAreaRadius / bands;
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float r = innerRadius;
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for (int b = 0; b <= bands; b++, r += dr) {
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float circumference = 2.0f * PI * r;
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final int pointsInBand = (int) (circumference / ds);
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float eta = PI / 2.0f;
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float dEta = 2.0f * PI / pointsInBand;
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for (int i = 0; i < pointsInBand; i++) {
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float x = r * FloatMath.cos(eta);
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float y = r * FloatMath.sin(eta);
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eta += dEta;
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mPointCloud.add(new Point(x, y, r));
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}
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}
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}
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public void setScale(float scale) {
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mScale = scale;
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}
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public float getScale() {
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return mScale;
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}
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private static float hypot(float x, float y) {
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return FloatMath.sqrt(x * x + y * y);
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}
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private static float max(float a, float b) {
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return a > b ? a : b;
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}
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public int getAlphaForPoint(Point point) {
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// Contribution from positional glow
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float glowDistance = hypot(glowManager.x - point.x, glowManager.y - point.y);
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float glowAlpha = 0.0f;
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if (glowDistance < glowManager.radius) {
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float cosf = FloatMath.cos(PI * 0.25f * glowDistance / glowManager.radius);
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glowAlpha = glowManager.alpha * max(0.0f, (float) Math.pow(cosf, 10.0f));
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}
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// Compute contribution from Wave
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float radius = hypot(point.x, point.y);
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float distanceToWaveRing = (radius - waveManager.radius);
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float waveAlpha = 0.0f;
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if (distanceToWaveRing < waveManager.width * 0.5f && distanceToWaveRing < 0.0f) {
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float cosf = FloatMath.cos(PI * 0.25f * distanceToWaveRing / waveManager.width);
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waveAlpha = waveManager.alpha * max(0.0f, (float) Math.pow(cosf, 20.0f));
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}
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return (int) (max(glowAlpha, waveAlpha) * 255);
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}
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private float interp(float min, float max, float f) {
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return min + (max - min) * f;
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}
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public void draw(Canvas canvas) {
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ArrayList<Point> points = mPointCloud;
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canvas.save(Canvas.MATRIX_SAVE_FLAG);
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canvas.scale(mScale, mScale, mCenterX, mCenterY);
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for (int i = 0; i < points.size(); i++) {
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Point point = points.get(i);
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final float pointSize = interp(MAX_POINT_SIZE, MIN_POINT_SIZE,
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point.radius / mOuterRadius);
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final float px = point.x + mCenterX;
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final float py = point.y + mCenterY;
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int alpha = getAlphaForPoint(point);
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if (alpha == 0) continue;
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if (mDrawable != null) {
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canvas.save(Canvas.MATRIX_SAVE_FLAG);
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final float cx = mDrawable.getIntrinsicWidth() * 0.5f;
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final float cy = mDrawable.getIntrinsicHeight() * 0.5f;
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final float s = pointSize / MAX_POINT_SIZE;
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canvas.scale(s, s, px, py);
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canvas.translate(px - cx, py - cy);
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mDrawable.setAlpha(alpha);
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mDrawable.draw(canvas);
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canvas.restore();
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}
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else {
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mPaint.setAlpha(alpha);
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canvas.drawCircle(px, py, pointSize, mPaint);
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}
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}
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canvas.restore();
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}
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}
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