| /* |
| * Copyright (C) 2016 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.prefabulated.touchlatency; |
| |
| import android.app.Activity; |
| import android.content.Context; |
| import android.graphics.Canvas; |
| import android.graphics.Color; |
| import android.graphics.Paint; |
| import android.os.CountDownTimer; |
| import android.os.Bundle; |
| import android.text.method.Touch; |
| import android.util.AttributeSet; |
| import android.util.Log; |
| import android.view.Menu; |
| import android.view.MenuItem; |
| import android.view.MotionEvent; |
| import android.view.View; |
| import android.os.Trace; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| |
| class TouchLatencyView extends View implements View.OnTouchListener { |
| private static final String LOG_TAG = "TouchLatency"; |
| private static final int BACKGROUND_COLOR = 0xFF400080; |
| private static final int INNER_RADIUS = 70; |
| private static final int BALL_RADIUS = 100; |
| |
| public TouchLatencyView(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| Trace.beginSection("TouchLatencyView constructor"); |
| setOnTouchListener(this); |
| setWillNotDraw(false); |
| mBluePaint = new Paint(Paint.ANTI_ALIAS_FLAG); |
| mBluePaint.setColor(0xFF0000FF); |
| mBluePaint.setStyle(Paint.Style.FILL); |
| mGreenPaint = new Paint(Paint.ANTI_ALIAS_FLAG); |
| mGreenPaint.setColor(0xFF00FF00); |
| mGreenPaint.setStyle(Paint.Style.FILL); |
| mYellowPaint = new Paint(Paint.ANTI_ALIAS_FLAG); |
| mYellowPaint.setColor(0xFFFFFF00); |
| mYellowPaint.setStyle(Paint.Style.FILL); |
| mRedPaint = new Paint(Paint.ANTI_ALIAS_FLAG); |
| mRedPaint.setColor(0xFFFF0000); |
| mRedPaint.setStyle(Paint.Style.FILL); |
| |
| mTouching = false; |
| |
| mBallX = 100.0f; |
| mBallY = 100.0f; |
| mVelocityX = 7.0f; |
| mVelocityY = 7.0f; |
| Trace.endSection(); |
| } |
| |
| @Override |
| public boolean onTouch(View view, MotionEvent event) { |
| Trace.beginSection("TouchLatencyView onTouch"); |
| int action = event.getActionMasked(); |
| if (action == MotionEvent.ACTION_DOWN || action == MotionEvent.ACTION_MOVE) { |
| mTouching = true; |
| invalidate(); |
| |
| mTouchX = event.getX(); |
| mTouchY = event.getY(); |
| } else if (action == MotionEvent.ACTION_UP) { |
| mTouching = false; |
| invalidate(); |
| } |
| Trace.endSection(); |
| return true; |
| } |
| |
| private void drawTouch(Canvas canvas) { |
| Trace.beginSection("TouchLatencyView drawTouch"); |
| |
| try { |
| if (!mTouching) { |
| Log.d(LOG_TAG, "Filling background"); |
| canvas.drawColor(BACKGROUND_COLOR); |
| return; |
| } |
| |
| float deltaX = (mTouchX - mLastDrawnX); |
| float deltaY = (mTouchY - mLastDrawnY); |
| float scaleFactor = (float) Math.sqrt(deltaX * deltaX + deltaY * deltaY) * 1.5f; |
| |
| mLastDrawnX = mTouchX; |
| mLastDrawnY = mTouchY; |
| |
| canvas.drawColor(BACKGROUND_COLOR); |
| canvas.drawCircle(mTouchX, mTouchY, INNER_RADIUS + 3 * scaleFactor, mRedPaint); |
| canvas.drawCircle(mTouchX, mTouchY, INNER_RADIUS + 2 * scaleFactor, mYellowPaint); |
| canvas.drawCircle(mTouchX, mTouchY, INNER_RADIUS + scaleFactor, mGreenPaint); |
| canvas.drawCircle(mTouchX, mTouchY, INNER_RADIUS, mBluePaint); |
| } finally { |
| Trace.endSection(); |
| } |
| } |
| |
| private void drawBall(Canvas canvas) { |
| Trace.beginSection("TouchLatencyView drawBall"); |
| int width = canvas.getWidth(); |
| int height = canvas.getHeight(); |
| |
| // Update position |
| mBallX += mVelocityX; |
| mBallY += mVelocityY; |
| |
| // Clamp and change velocity if necessary |
| float left = mBallX - BALL_RADIUS; |
| if (left < 0) { |
| left = 0; |
| mVelocityX *= -1; |
| } |
| |
| float top = mBallY - BALL_RADIUS; |
| if (top < 0) { |
| top = 0; |
| mVelocityY *= -1; |
| } |
| |
| float right = mBallX + BALL_RADIUS; |
| if (right > width) { |
| right = width; |
| mVelocityX *= -1; |
| } |
| |
| float bottom = mBallY + BALL_RADIUS; |
| if (bottom > height) { |
| bottom = height; |
| mVelocityY *= -1; |
| } |
| |
| // Draw the ball |
| canvas.drawColor(BACKGROUND_COLOR); |
| canvas.drawOval(left, top, right, bottom, mYellowPaint); |
| invalidate(); |
| Trace.endSection(); |
| } |
| |
| @Override |
| protected void onDraw(Canvas canvas) { |
| super.onDraw(canvas); |
| Trace.beginSection("TouchLatencyView onDraw"); |
| if (mMode == 0) { |
| drawTouch(canvas); |
| } else { |
| drawBall(canvas); |
| } |
| Trace.endSection(); |
| } |
| |
| public void changeMode(MenuItem item) { |
| Trace.beginSection("TouchLatencyView changeMode"); |
| final int NUM_MODES = 2; |
| final String modes[] = {"Touch", "Ball"}; |
| mMode = (mMode + 1) % NUM_MODES; |
| invalidate(); |
| item.setTitle(modes[mMode]); |
| Trace.endSection(); |
| } |
| |
| private Paint mBluePaint, mGreenPaint, mYellowPaint, mRedPaint; |
| private int mMode; |
| |
| private boolean mTouching; |
| private float mTouchX, mTouchY; |
| private float mLastDrawnX, mLastDrawnY; |
| |
| private float mBallX, mBallY; |
| private float mVelocityX, mVelocityY; |
| } |
| |
| public class TouchLatencyActivity extends Activity { |
| |
| @Override |
| protected void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| Trace.beginSection("TouchLatencyActivity onCreate"); |
| setContentView(R.layout.activity_touch_latency); |
| |
| mTouchView = findViewById(R.id.canvasView); |
| Trace.endSection(); |
| } |
| |
| |
| @Override |
| public boolean onCreateOptionsMenu(Menu menu) { |
| Trace.beginSection("TouchLatencyActivity onCreateOptionsMenu"); |
| // Inflate the menu; this adds items to the action bar if it is present. |
| getMenuInflater().inflate(R.menu.menu_touch_latency, menu); |
| Trace.endSection(); |
| return true; |
| } |
| |
| @Override |
| public boolean onOptionsItemSelected(MenuItem item) { |
| Trace.beginSection("TouchLatencyActivity onOptionsItemSelected"); |
| // Handle action bar item clicks here. The action bar will |
| // automatically handle clicks on the Home/Up button, so long |
| // as you specify a parent activity in AndroidManifest.xml. |
| int id = item.getItemId(); |
| |
| //noinspection SimplifiableIfStatement |
| if (id == R.id.action_settings) { |
| mTouchView.changeMode(item); |
| } |
| |
| Trace.endSection(); |
| return super.onOptionsItemSelected(item); |
| } |
| |
| private TouchLatencyView mTouchView; |
| } |