Hi,

I have only recently started learning processing. I am in the process of writing a code where particles react to the presence of objects.

Currently my entire code works if i use rectangles - the moment i attempt to add a triangle or a quad with the same properties as the rectangle it produces an error.

I have attached both my original rectangle and my 'triangle' script - i'm not too sure whether i am perhaps missing something?

Thanks,
Anna


The Problem Script:
//Declaring a global variable of type ArrayList
ArrayList particles;

//A "rectangle" will bounce particles
Rectangle blackhole1;
Rectangle blackhole3;
//A "triangle" will bounce particles
Triangle blackhole2;

int x1;
int y1;
int x2;
int y2;
int x3;
int y3;

void setup()
{
 size(800,800);
 x1 = 100;
 y1 = 20;
 x2 = 30;
 y2 = 400;
 x3 = 300;
 y3 = 200;
 
 blackhole1 = new Rectangle(50,50,100,25);
 //Specify triangle
 blackhole2 = new Triangle(100,20,30,400,300,200);
 blackhole3 = new Rectangle(400,500,100,50);
 particles = new ArrayList ();
 smooth();
}

void draw()
{
 background(255);

 //Displaying the rectangle
 stroke(0);
 fill(175);
 rect(blackhole1.x, blackhole1.y, blackhole1.width, blackhole1.height);
 //Add triangle variables
 triangle(blackhole2.x1, blackhole2.y1,blackhole2.x2, blackhole2.y2,blackhole2.x3, blackhole2.y3);
 rect(blackhole3.x, blackhole3.y, blackhole3.width, blackhole3.height);
 //MAKE THIS TRIANGLE
 //triangle(blackhole2.x1,blackhole2.y1, blackhole2.x2,blackhole2.y2,blackhole2.x3,blackhole2.y3);

 
 //Add a new particle at mouse location
 particles.add(new Particle(mouseX, mouseY));
 
 //Loop through all particles
 for (int i = particles.size()-1; i >= 0; i--)
 {
   Particle p = (Particle) particles.get(i);
   p.run();
   p.direction();
   p.display();
   
   if (blackhole1.contains(p.x,p.y))
   {
     p.bounce();
   }
   
   //Add triangle properties to bounce off
   if (blackhole2.contains(p.x1,p.y1,p.x2,p.y2,p.x3,p.y3))
   {
     p.bounce();
   }

   
   if (blackhole3.contains(p.x,p.y))
   {
     p.bounce();
   }

 }
}

//A simple Particle Class
class Particle
{
 float x;
 float y;
 float xspeed;
 float yspeed;
 float life;
 
 //Make the Particle
 Particle (float tempX, float tempY)
 {
   x = tempX;
   y = tempY;
   //Change angle of particle movement
   xspeed = random(-2,1);
   yspeed = random(-2,0);
   life = 255;
 }
 
 //Move
 void run()
 {
   x = x - xspeed;
   //Y at + when particles move down screen; and at - when they move up
   y = y + yspeed;
 }
 
 //Fall down
 void direction()
 {
   //yspeed for horizontal movement
   //yspeed = - 0.01;
   //xspeed for vertical movement
   xspeed = - 0.4;
 }
 
 //Make balls bounce of walls
 void bounce()
 {
   xspeed = (-xspeed/1.01);
   yspeed = (-yspeed/1.01);
 }
 
 //Show
 void display()
 {
   stroke(0);
   fill(255,0, life);
   ellipse(x,y,8,8);
 }
}





Original Script:

//Declaring a global variable of type ArrayList
ArrayList particles;

//A "rectangle" will bounce particles
Rectangle blackhole1;
Rectangle blackhole3;


void setup()
{
 size(800,800);
 blackhole1 = new Rectangle(50,50,100,25);
 blackhole3 = new Rectangle(400,500,100,50);
 particles = new ArrayList ();
 smooth();
}

void draw()
{
 background(255);

 //Displaying the rectangle
 stroke(0);
 fill(175);
 rect(blackhole1.x, blackhole1.y, blackhole1.width, blackhole1.height);
 rect(blackhole3.x, blackhole3.y, blackhole3.width, blackhole3.height);
 //MAKE THIS TRIANGLE
 //triangle(blackhole2.x1,blackhole2.y1, blackhole2.x2,blackhole2.y2,blackhole2.x3,blackhole2.y3);

 
 //Add a new particle at mouse location
 particles.add(new Particle(mouseX, mouseY));
 
 //Loop through all particles
 for (int i = particles.size()-1; i >= 0; i--)
 {
   Particle p = (Particle) particles.get(i);
   p.run();
   p.direction();
   p.display();
   
   if (blackhole1.contains(p.x,p.y))
   {
     p.bounce();
   }

   
   if (blackhole3.contains(p.x,p.y))
   {
     p.bounce();
   }

 }
}

//A simple Particle Class
class Particle
{
 float x;
 float y;
 float xspeed;
 float yspeed;
 float life;
 
 //Make the Particle
 Particle (float tempX, float tempY)
 {
   x = tempX;
   y = tempY;
   //Change angle of particle movement
   xspeed = random(-2,1);
   yspeed = random(-2,0);
   life = 255;
 }
 
 //Move
 void run()
 {
   x = x - xspeed;
   //Y at + when particles move down screen; and at - when they move up
   y = y + yspeed;
 }
 
 //Fall down
 void direction()
 {
   //yspeed for horizontal movement
   //yspeed = - 0.01;
   //xspeed for vertical movement
   xspeed = - 0.4;
 }
 
 //Make balls bounce of walls
 void bounce()
 {
   xspeed = (-xspeed/1.01);
   yspeed = (-yspeed/1.01);
 }
 
 //Show
 void display()
 {
   stroke(0);
   fill(255,0, life);
   ellipse(x,y,8,8);
 }
}