/*
* 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.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.CountDownTimer;
import android.support.v7.app.ActionBarActivity;
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 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);
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;
}
@Override
public boolean onTouch(View view, MotionEvent event) {
int action = event.getActionMasked();
if (action == MotionEvent.ACTION_DOWN || action == MotionEvent.ACTION_MOVE) {
mTouching = true;
invalidate();
} else if (action == MotionEvent.ACTION_UP) {
mTouching = false;
invalidate();
return true;
} else {
return true;
}
mTouchX = event.getX();
mTouchY = event.getY();
return true;
}
private void drawTouch(Canvas canvas) {
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);
}
private void drawBall(Canvas canvas) {
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();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (mMode == 0) {
drawTouch(canvas);
} else {
drawBall(canvas);
}
}
public void changeMode(MenuItem item) {
final int NUM_MODES = 2;
final String modes[] = {"Touch", "Ball"};
mMode = (mMode + 1) % NUM_MODES;
invalidate();
item.setTitle(modes[mMode]);
}
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 ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_touch_latency);
mTouchView = (TouchLatencyView) findViewById(R.id.canvasView);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_touch_latency, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// 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);
}
return super.onOptionsItemSelected(item);
}
private TouchLatencyView mTouchView;
}