The Interactive Image (Fall 2005)

Code

//Leonardo Covarrubias
//Exercise013
//
//trail of lines follow the mouse, lines are perpendicular to most recent mouse vector, and equal to the vector length

int mousex1 = mouseX;
int mousey1 = mouseY;
int mousex2;
int mousey2;

Line [] lineArray = new Line[100];

void setup(){
  size(400, 400);
  strokeWeight(3);
  
  background(0);
}


void draw(){
  background(0);
  stroke(255);
  framerate(20);
  smooth();
  
  mousex2 = mousex1;
  mousey2 = mousey1;
  
  mousex1 = mouseX;
  mousey1 = mouseY;
  
  //Fills the array if empty
  if(lineArray[1] == null){
    for(int i = 0; i < 10; i++){
      lineArray[i] = new Line(mousey1, mousex1, mousey2, mousex2);
    }
  }
  
  //shifts lines in the array
  for(int i = 99; i > 0; i--){
    lineArray[i] = lineArray[i-1];
  }
  
  //adds a new line at array 0
  lineArray[0] = new Line(mousex1-(mousey1-mousey2), mousey1+(mousex1-mousex2), mousex1+(mousey1-mousey2), mousey1-(mousex1-mousex2));
  
  //draws the lines from the array
  for(int i = 0; i < 100; i++){
    if(lineArray[i] == null){
      break;
    }
    lineArray[i].drawLine();
  }


  
}

//defines a Line
class Line {
  
  int x1,y1,x2,y2;
  
  Line(int x,int y,int X,int Y){
    
    x1 = x;
    y1 = y;
    x2 = X;
    y2 = Y;
  
  }
  
  void drawLine(){
    line(x1,y1,x2,y2);
  }
}