teaching machines

CS 145 Lecture 7 – Random and Naming Our Code

September 17, 2014 by Chris Johnson. Filed under cs145, fall 2014, lectures.

Agenda

• what ?s
• grading twist
• weekly outside problems
• a parameterized circle
• a random parameterized circle
• methods
• a bunch of random parameterized circles
• hungry methods
• prepping data for mail merge

TODO

• Attend the first SACM meeting. Several students will be speaking on their internship experiences from this past summer. Ask a thoughtful question of one of the speakers, and share it and its answer on an extra credit 1/4 sheet.
• Read sections 1.4 and chapter 3 through section 3.3. Turn in a 1/4 sheet with two questions/two observations.

Code

Circle.java

package lecture0917;

import java.util.Random;

public class Circle {
  public static void main(String[] args) {
    Random generator = new Random();

    System.out.println("<svg xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\">");
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);
    printCircle(generator);

    System.out.println("</svg>");
  }
  
  public static void printCircle(Random g) {
    int cx = g.nextInt(1000);
    int cy = g.nextInt(600);
    int r = g.nextInt(23) + 1;
    int red = g.nextInt(256);
    int green = g.nextInt(256);
    int blue = g.nextInt(256);
    System.out.printf("<circle cx=\"%d\" cy=\"%d\" r=\"%d\" stroke=\"black\" stroke-width=\"2\" fill=\"rgb(%d, %d, %d)\" />%n",
                      cx, cy, r, red, green, blue);
  }
}

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