new to java need help with code asap

[stark123]

hi guy, this is my first post and i need help with one of my codes asap. I am trying to replace the ellipses and rect with my custom logo. I am having trouble doing that. I know it's sounds very noobish but i guess that's how u learn.

here is the code. I am using processing to write java

void setup()   
{  
  size(400, 400);   
  noStroke();  
  rectMode(CENTER);
}  

void mouseDragged()   
{     
  interact();
}

void draw () {
}
//
void interact () {
  background(51);   
  fill(255, 80, 190);
  customLogo(width-mouseX, height/2, ((height-mouseY)/2)+10, ((height-mouseY)/2)+10);
  fill(55, 80, 105); 
  customLogo(mouseX, height/2, mouseY/2+10, mouseY/2+10);  
  fill(0, 80, 219);  
  customLogo(width-mouseX+random(3), height/2, ((height-mouseY)/2)+10, ((height-mouseY)/2)+10);
  fill(200, 70, 119);  
  customLogo(width-mouseX, height/5, ((height-mouseY)/5)+10, ((height-mouseY)/5)+10);
}
void customLogo( ) {
   int x;
   int y;
    int squareSize;
  color fillColor = color (255, 0, 0); // color of square
  color strokeColor = fillColor;

  rectMode(CENTER);
  fill(fillColor);
  stroke(strokeColor);
  rect(x, y, squareSize, squareSize);
  textAlign(CENTER);
  fill(255);
  text("U", x, y+10);
} // function

I have another assignment with i need help with here are the instructions. I have no idea how to do the connect lines
i have to write a sketch as the user clicks on the screen, small pulses are created. When the user hits the 'd' key, the pulses are connected together by lines with the first line segment between the first and second points made, the second line segment between the second and third points made, etc. Allow the user the clear the canvas and start over by hitting the space bar. b. Rewrite so that the first connecting line has a stroke of 1, the next a stroke of 2, the third a stroke of 3, etc. c. Rewrite so that the order in which the line is drawn is reversed, i.e., the first line sgement is drawn between the last and next-to-last points, the second line segement is drawn between the next-to-last and third-from-last points, etc
the code

 // ----------------------------------------------------------------------
    // CUSTOM CLASSES
    // ----------------------------------------------------------------------
    //Pulse is a class that draws a pulsing dot on the screen
    class Pulse {
      /* properties */
      int SCALE = 50;
      int x;    // x-coordinate of the pulse
      int y;    // y-coordinate of the pulse
      float s;  // size of the pulse
      color myColor = color(255, 255, 255); //default color
      /* methods */
      // constructor 1
      public Pulse(int pulseX, int pulseY) {
        x = pulseX;
        y = pulseY;
        s = 5;
      }
      // constructor 2
      public Pulse(int pulseX, int pulseY, int pulseScale) {
        x = pulseX;
        y = pulseY;
        SCALE = pulseScale;
        s = 0;
      }
      // constructor 3
      public Pulse() {
        x = 0;
        y = 0;
        s = 0;
      }
      // constructor 4
      public Pulse(int pulseX, int pulseY, int pulseScale, color newColor) {
        x = pulseX;
        y = pulseY;
        SCALE = pulseScale;
        s = 0;
        myColor = newColor;
      }
      // moves the pulse to the given position
      void move(int newX, int newY) {
        x = newX;
        y = newY;
      }
      // draws the pulse and updates its size
      void display() {
        fill(myColor);
        stroke(0);
        ellipse(x, y, sin(s)*SCALE, sin(s)*SCALE);
        s += 0.1;
      }
    }
    // ----------------------------------------------------------------------
    // GLOBAL VARIABLES
    // ----------------------------------------------------------------------
    int numPulses = 100;
    //counter tracking how many pulse objects have been istantiated
    int pulseArrayCounter = 0;
    //create of any array type pulse pulse array with 1000 elements
    Pulse[] pulseArray = new Pulse[numPulses];
    int xPos, yPos; // x and y coordinates
    // boolean to check when the array is full,set its index to "0" and redraws the pulse.
    boolean arrayIsFull = false;
    // ----------------------------------------------------------------------
    // BUILT-IN FUNCTIONS
    // ----------------------------------------------------------------------
    void setup() {
      size(400, 400);
      smooth();
      color tempColor = color(random(255), random(255), random(255));
    }
    void draw() {
      background(0);
      // draw the pulse
      for (int index = 0; index < pulseArrayCounter; index++) {
        pulseArray[index].display();
      }
    }
    void mouseDragged() {
      stopMessage();
    }
    void mousePressed() {
      stopMessage();
    }
    void stopMessage() {
      color tempColor = color(random(255), random(255), random(255));
      int newScale = int(random(100));
      // initialize a new pulse object
      if (pulseArrayCounter < pulseArray.length) {
        pulseArray[pulseArrayCounter] = new Pulse(mouseX, mouseY, newScale, tempColor);
        pulseArrayCounter++;
      }
      else {
        arrayIsFull = true;
        pulseArrayCounter = 0;
      }
    }