=========================  QUICK EXERCISE: Exam 1 Question 5

ExamPicture q = new ExamPicture( "/Users/wallingf/Desktop/wallingf-250x328.jpg" )
q.problemFive();
q.show();
q.write( "/Users/wallingf/Desktop/wallingf-problemFived.jpg" );

q = new ExamPicture( "/Users/wallingf/Desktop/wallingf-250x328.jpg" )
q.problemFiveOneIf();
q.show();

q = new ExamPicture( "/Users/wallingf/Desktop/wallingf-250x328.jpg" )
q.problemFiveAverage();
q.show();

=========================  TASK: chromakey on blue

Picture blueMark = new Picture( "/Users/wallingf/Desktop/blue-mark.jpg" );
blueMark.show();

Picture background = new Picture( "/Users/wallingf/Desktop/movie-background.jpg" );
background.show();

blueMark.chromakeyOnBlue( background );
blueMark.repaint();

                                 -----   pattern: "method for design choices"

=========================  SLIDES: sound encoding

=========================  DEMO: working with sound

> Sound preamble = new Sound( "/Users/wallingf/Desktop/preamble.wav" );
> preamble
Sound file: /Users/wallingf/Desktop/preamble.wav number of samples: 421110

> preamble.play();

> SoundSample[] samples = preamble.getSamples();
> samples.length
421110

> samples[0]
Sample at index 0 has value 36
> samples[10]
Sample at index 10 has value 46
> samples[100]
Sample at index 100 has value 24
> samples[1000]
Sample at index 1000 has value -2
> samples[10000]
Sample at index 10000 has value 416
> samples[100000]
Sample at index 100000 has value 4
> samples[1000000]
ArrayIndexOutOfBoundsException: 
  at java.lang.reflect.Array.get(Native Method)

> preamble.displaySamples( 10 );                    // I wrote this method
Sample at index 0 has value 36
Sample at index 1 has value 29
Sample at index 2 has value 22
Sample at index 3 has value 18
Sample at index 4 has value 10
Sample at index 5 has value 31
Sample at index 6 has value 34
Sample at index 7 has value 34
Sample at index 8 has value 40
Sample at index 9 has value 45

> preamble.getLength()
421110
> preamble.getSamplingRate()
22050.0

> preamble.explore()

> preamble.getSampleValueAt( 1 )
29
> preamble.getSampleValueAt( 10 )
46
> preamble.getSampleValueAt( 100 )
24
...
> preamble.getSampleValueAt( 1000000 )
You are trying to access the sample at index: 1000000, but the last valid index is at 421109
That index 1000000, does not exist. The last valid index is 421109
The index 1000000 isn't valid for this sound
0

                                 -----   what about a *real* audio file?

> Sound sweetDreams = new Sound( "/Users/wallingf/Desktop/SweetDreams.aiff" );
> sweetDreams
Sound file: /Users/wallingf/Desktop/SweetDreams.aiff number of samples: 9436032

> sweetDreams.getSampleValueAt( 100 )
0
> sweetDreams.getSampleValueAt( 100000 )
1138

                                 -----   how about a real for loop?

> preamble.amplify( 0.5 );                    // I wrote this method
> preamble.play();                            // ... and it's louder!