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95 lines
3.0 KiB
95 lines
3.0 KiB
/*
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* Copyright 2010 Google Inc.
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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 com.levien.synthesizer.android.widgets.piano;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Rect;
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import com.levien.synthesizer.core.music.Note;
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/**
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* One of the black (non-natural) keys on the piano.
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*/
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public class BlackPianoKey extends NotePianoKey {
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/**
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* Creates a new key.
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* @param piano - the piano this key is on.
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* @param octaveOffset - octave of the key, relative to the leftmost octave of the piano.
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* @param key - offset of the key from the start of the octave.
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*/
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public BlackPianoKey(PianoView piano, int octave, int key) {
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super(piano, octave, key);
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}
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/**
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* Sets rect_ to the position of this key, based on the drawing rect of the piano it's on.
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* @param drawingRect - the position of the piano itself.
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* @param octaves - the number of octaves visible on the piano keyboard.
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*/
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public void layout(Rect drawingRect, int octaves) {
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int whiteKeyWidth = getWhiteKeyWidth(drawingRect, octaves);
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int blackKeyWidth = getBlackKeyWidth(drawingRect, octaves);
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rect_.top = 0;
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rect_.bottom = rect_.top + getBlackKeyHeight(drawingRect);
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rect_.left = ((octaveOffset_ * WHITE_KEYS.length + key_ + 2) * whiteKeyWidth) -
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(blackKeyWidth/2);
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rect_.right = rect_.left + blackKeyWidth;
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}
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/**
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* Returns the log frequency of the note of the key.
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*/
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public double getLogFrequency() {
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return Note.computeLog12TET(BLACK_KEYS[key_], octaveOffset_ + piano_.getFirstOctave());
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}
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/**
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* Draws the key in the current rect_.
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*/
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public void draw(Canvas canvas) {
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strokePaint_.setColor(Color.BLACK);
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if (isPressed()) {
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fillPaint_.setColor(Color.GREEN);
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} else {
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fillPaint_.setColor(Color.BLACK);
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}
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canvas.drawRect(rect_, fillPaint_);
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canvas.drawRect(rect_, strokePaint_);
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}
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/**
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* Returns true if this is one of the black key positions that should actually have a key.
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*/
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public static boolean isValid(int note) {
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return BLACK_KEYS[note] != Note.NONE;
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}
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/**
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* Utility function to calculate the width that a standard black key on this keyboard should be.
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*/
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protected static int getBlackKeyWidth(Rect drawingRect, int octaves) {
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return (getWhiteKeyWidth(drawingRect, octaves) * 2) / 3;
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}
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/**
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* Utility function to calculate the height that a standard black key on this keyboard should be.
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*/
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protected static int getBlackKeyHeight(Rect drawingRect) {
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return getWhiteKeyHeight(drawingRect) / 2;
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}
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}
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