Stripchart recorder

/**

 * Demonstration for a "stripchart recorder" class.

 */

​

Stripchart s1;

Stripchart s2;

Stripchart s3;

Stripchart s4;

int n = 0;

​

void setup() {

  size(400, 250, P2D); // animation is much smoother in P2D; text looks better with JAVA2D

  background(255);

  /*

   * Parameters to constructor are:

   * x position, y position

   * number of data points to display at any time

   * height of "recording" area

   * interval at which to draw the gray vertical bar; set to zero for no bar

   * color of stripchart plot

   * minimum and maximum values to plot (will constrain to those values)

   *

   * The actual height of the stripchart includes some extra vertical space

   * above and below the recording area. The actual width of the stripchart

   * includes room for the minimum and maximum values.

   */

  s1 = new Stripchart(10, 50, 180, 50, 45, color(0, 128, 0), -1.0, 1.0); 

  s2 = new Stripchart(10, 110, 180, 50, 45, color(255, 0, 0), -1.0, 1.0);

  s3 = new Stripchart(10, 170, 120, 50, 0, color(0, 128, 128), 0, 400);

  s4 = new Stripchart(200, 170, 120, 50, 0, color(128, 0, 128), 0, 250);

  frameRate(30);

}

​

void draw() {

  /*

   * The first chart draws a cosine wave, one dot per frame

   */

  s1.plot(cos(radians(frameCount % 360)));

  /*

   * The next chart draws a sine wave, but is "faster" because

   * it adds three pieces of data every time it displays the chart.

   */

  s2.addData(sin(radians(n)));

  s2.addData(sin(radians(n + 1)));

  s2.addData(sin(radians(n + 2)));

  s2.display();

  n = (n + 3) % 360; 

  /* The last two charts track mouseX and mouseY movement */

  s3.plot(mouseX);

  s4.plot(mouseY);

​

}

​

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