Question

Original: Sound Visualization Write a program that uses StdAudio and Picture to create an interesting two-dimensional color visualization of a sound file while it is playing. Be creative! Additional Notes: double[] data = StdAudio.read(<filename>); -> Takes a sound file and store it as a 2D array of real numbers. Picture pic = new Picture(300,200); -> Creates a picture 300 pixels wide and 200 pixels high Color c= new Color(<red>,<green>,<blue>); -> Each value of <red>, <green>, <blue> is between 0 and 255. pic.set(x,y,c); -> Changes the color of a single pixel in the image. x and y are locations in the Picture and c is the color to make the pixel. pic.show(); -> So you can see your drawing, Optional Version: For Those using repl.it for coding Write a program that uses StdAudioRepl and Std DrawAscil to create an interesting two-dimensional ASCII visualization of a randomly generated mixture of sin and cos waves. Additional Notes: double[] data StdAudioRepl.generateData(); -> Generates a random set of reals based on sin and cos. 320 total values. char(10) data = new char[x][y];

in java

Answer 1

 import java.awt.Color; import java.io.IOException; public class Solution { private static int IMAGE_WIDTH = 500; private static int IMAGE_HEIGHT = 100; static String filename = "O:\\1.wav"; public static void main(final String[] args) throws IOException { // reading sound file to samples double[] samples = StdAudio.read(filename); // creating empty image Picture p = new Picture(IMAGE_WIDTH, IMAGE_HEIGHT); // filling image from left to right for (int i = 0; i < IMAGE_WIDTH; i++) { // filling image from top to bottom for (int j = 0; j < IMAGE_HEIGHT; j++) { // adding 44100 to skip 1s of silence at the beginning p.set(i, j, doubleToColor(samples[44100 + i])); } } p.show(); } // convert number from range -1.0..1.0 to 0..255 private static Color doubleToColor(double d) { int val = (int) (((d + 1) / 2) * 255); return new Color(val, val, val); } }