Colour_Splash

Ball_Class
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​
​
// set up ball class
// setup random colours
// setup random x and y speeds
// make balls on click
​
private float horizontal_friction;
private float bounce_elasticity;
​
private int background_color;
private boolean draw_circles;
private float start_speed;
​
private float y_acc;  // gravity value
​
private float ball_size;
private int num_balls;
Ball_Class[] balls;
​
private int num_colours;
color[] colours;
​
void setup()
{
  size(800, 800);
  initValues();
​
  balls = new Ball_Class[num_balls];
  for (int i = 0; i < num_balls; i++)
  {
    balls[i] = new Ball_Class();
    balls[i].x_pos = random(width);
    balls[i].y_pos = random(height);
    balls[i].circle_diameter = random(ball_size);
    balls[i].fill_colour = randColor();
    balls[i].stroke_colour = randColor();
  }
​
  colours = new color[num_colours];
  generateColourArray();
}
​
void draw()
{
  if (draw_circles)
  {
    // background(background_color);
    for (int i =0; i < num_balls; i++)
    {
      fill(balls[i].fill_colour);
      stroke(balls[i].stroke_colour);
      ellipse(balls[i].x_pos, balls[i].y_pos, balls[i].circle_diameter, balls[i].circle_diameter);
      updatePhysics(balls[i]);
    }
  }
}
void mousePressed()
{
  generateShapes();
}
​
void mouseDragged()
{
  generateShapes();
}
​
void initValues()
{
​
  horizontal_friction = 0.7f;
  bounce_elasticity = 0.7f;
​
  background_color = 255;
  draw_circles = false;
  start_speed = 50.0f;
​
  y_acc = 2f;
​
  ball_size = 100.0f;
  num_balls = 30;
​
  num_colours = 100;
}
​
void generateColourArray()
{
  for (int j =0; j < num_colours; j++)
  {
    colours[j] = randColor();
  }
}
​
void generateShapes()
{
​
  generateColourArray();
​
  for (int i = 0; i < num_balls; i++)
  {
    balls[i].x_pos = mouseX;
    balls[i].y_pos = mouseY;
    balls[i].x_speed = random(-start_speed, start_speed);
    balls[i].y_speed = random(-start_speed, start_speed);
    balls[i].circle_diameter = random(ball_size);
    // redo colors
​
​
​
    int random_colour_index = (int)random(num_colours);
    balls[i].fill_colour = colours[random_colour_index];
    random_colour_index = (int)random(num_colours);
    balls[i].stroke_colour = colours[random_colour_index];
​
    draw_circles = true;
  }
}
​
color randColor()
{
  return color(random(255), random(255), random(255), 255);
}
​
​
​
void updatePhysics(Ball_Class ball)
{
  // bounce off walls
  //ball.x_speed = wallBounceX(ball.x_speed, ball.x_pos);
​
  // update positions using speed
  ball.x_pos += ball.x_speed;
  ball.y_pos += ball.y_speed;
​
  if (ball.y_pos > height - ball.circle_diameter/2)
  {
    ball.y_pos = height - ball.circle_diameter/2;
    ball.y_speed *= -bounce_elasticity; // -1.0f * ball.y_speed * bounce_elasticity;
    ball.x_speed *= horizontal_friction;
  }
  if (ball.x_pos > width - ball.circle_diameter/2 || ball.x_pos < 0 + ball.circle_diameter/2)
  {
    if (ball.x_pos > width - ball.circle_diameter/2)
      ball.x_pos = width - ball.circle_diameter/2;
​
    if (ball.x_pos < 0 + ball.circle_diameter/2)
      ball.x_pos = 0 + ball.circle_diameter/2;
​
    ball.x_speed *= -1.0f;
  }
​
  // update speeds
  ball.y_speed = accelerateY(ball.y_speed, y_acc);
}
​
float accelerateY(float current_speed, float acc)
{
  // add acceleration to speed
  return current_speed + acc;
}