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EqualizerView.java
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EqualizerView.java
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// Copyright (C) 2010 Paul Marks http://www.pmarks.net/
//
// This file is part of Chroma Doze.
//
// Chroma Doze is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Chroma Doze is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Chroma Doze. If not, see <http://www.gnu.org/licenses/>.
package net.pmarks.chromadoze;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.MotionEvent;
public class EqualizerView extends android.view.View implements UIState.LockListener {
public static final int BAND_COUNT = SpectrumData.BAND_COUNT;
private final Paint mBarColor[] = new Paint[BAND_COUNT];
private final Paint mBaseColor[] = new Paint[4];
private final Paint mWhite = new Paint();
private UIState mUiState;
private float mWidth;
private float mHeight;
private float mBarWidth;
private float mZeroLineY;
public EqualizerView(Context context, AttributeSet attrs) {
super(context, attrs);
makeColors();
}
public void setUiState(UIState uiState) {
mUiState = uiState;
invalidate();
}
private void makeColors() {
Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.spectrum);
for (int i = 0; i < BAND_COUNT; i++) {
Paint p = new Paint();
int x = (bmp.getWidth() - 1) * i / (BAND_COUNT - 1);
p.setColor(bmp.getPixel(x, 0));
mBarColor[i] = p;
}
int i = 0;
for (int v : new int[]{100, 75, 55, 50}) {
Paint p = new Paint();
p.setColor(Color.rgb(v, v,v));
mBaseColor[i++] = p;
}
mWhite.setColor(Color.WHITE);
}
@Override
protected void onDraw(Canvas canvas) {
final Phonon ph = mUiState != null ? mUiState.getPhonon() : null;
final boolean isLocked = mUiState != null ? mUiState.getLocked() : false;
for (int i = 0; i < BAND_COUNT; i++) {
float bar = ph != null ? ph.getBar(i) : .5f;
float startX = mBarWidth * i;
float stopX = startX + mBarWidth;
float startY = barToY(bar);
float midY = startY + mBarWidth;
if (bar > 0) {
canvas.drawRect(startX, startY, stopX, midY, mBarColor[i]);
}
// Lower the brightness and contrast when locked.
canvas.drawRect(startX, midY, stopX, mHeight,
mBaseColor[i % 2 + (isLocked ? 2 : 0)]);
}
canvas.drawLine(0, mZeroLineY, mWidth, mZeroLineY, mWhite);
}
private float mLastX;
private float mLastY;
@Override
public boolean onTouchEvent(MotionEvent event) {
if (mUiState.getLocked()) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mUiState.setLockBusy(true);
return true;
case MotionEvent.ACTION_UP:
mUiState.setLockBusy(false);
return true;
case MotionEvent.ACTION_MOVE:
return true;
}
return false;
}
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mLastX = event.getX();
mLastY = event.getY();
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_MOVE:
break;
default:
return false;
}
PhononMutable phm = mUiState.getPhononMutable();
for (int i = 0; i < event.getHistorySize(); i++) {
touchLine(phm, event.getHistoricalX(i), event.getHistoricalY(i));
}
touchLine(phm, event.getX(), event.getY());
if (mUiState.sendIfDirty()) {
invalidate();
}
return true;
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
mWidth = getWidth();
mHeight = getHeight();
mBarWidth = mWidth / BAND_COUNT;
mZeroLineY = mHeight * .9f;
}
private float yToBar(float y) {
float barHeight = 1f - (y / (mZeroLineY - mBarWidth));
if (barHeight < 0) {
return 0;
}
if (barHeight > 1) {
return 1;
}
return barHeight;
}
private float barToY(float barHeight) {
return (1f - barHeight) * (mZeroLineY - mBarWidth);
}
private int getBarIndex(float x) {
int out = (int)(x / mBarWidth);
if (out < 0) {
out = 0;
}
if (out > BAND_COUNT - 1) {
out = BAND_COUNT - 1;
}
return out;
}
// Starting bar?
// Ending bar?
// For each bar it exits:
// set Y to exit-Y.
// For the ending point:
// set Y to final-Y.
// Exits:
// Right:
// 0->3: 0, 1, 2 [endpoint in 3]
// Left:
// 3->0: 3, 2, 1 [endpoint in 0]
private void touchLine(PhononMutable phm, float stopX, float stopY) {
float startX = mLastX;
float startY = mLastY;
mLastX = stopX;
mLastY = stopY;
int startBand = getBarIndex(startX);
int stopBand = getBarIndex(stopX);
int direction = stopBand > startBand ? 1 : -1;
for (int i = startBand; i != stopBand; i += direction) {
// Get the x-coordinate where we exited band i.
float exitX = i * mBarWidth;
if (direction > 0) {
exitX += mBarWidth;
}
// Get the Y value at exitX.
float slope = (stopY - startY) / (stopX - startX);
float exitY = startY + slope * (exitX - startX);
phm.setBar(i, yToBar(exitY));
}
// Set the Y endpoint.
phm.setBar(stopBand, yToBar(stopY));
}
@Override
public void onLockStateChange(LockEvent e) {
// Only spend time redrawing if this is an on/off event.
if (e == LockEvent.TOGGLE) {
invalidate();
}
}
}