rem

positions.txt

100, 100, 0.09
20, 20, 0.1
220, 220, 0.1
20, 200, 0.05
20, 20, 0.05

rem.pde

float beginX = 0.0;  // Initial x-coordinate
float beginY = 0.0;  // Initial y-coordinate
float endX = 0.0;   // Final x-coordinate
float endY = 0.0;   // Final y-coordinate
float distX;          // X-axis distance to move
float distY;          // Y-axis distance to move
float exponent = 1;   // Determines the curve
float x = 0.0;        // Current x-coordinate
float y = 0.0;        // Current y-coordinate
float step = 0.09;    // Size of each step along the path
float pct = 0.0;      // Percentage traveled (0.0 to 1.0)
ArrayList positions = new ArrayList();
int countPositions = 0;
	
BufferedReader reader;
String line;


void setup() {
  size(640, 360);
  noStroke();
  smooth();
  distX = endX - beginX;
  distY = endY - beginY;
  reader = createReader("/home/vilson/livecoding/positions.txt");
  do {
  try {
    line = reader.readLine();
  } catch (IOException e) {
    e.printStackTrace();
    line = null;
  }
  if (line != null) {
    String[] s = split(line, ',');
    Position p = new Position(float(s[0]), float(s[1]), float(s[2]));
    positions.add(p);
  }
  } while (line != null);
}

void draw() 
{ background(0);
  //fill(0, 2);
  //rect(0, 0, width, height);
  pct += step;
  if (pct < 1.0) {
    //x = beginX + (pct * distX);
    //y = beginY + (pow(pct, exponent) * distY);
    x = beginX + pct*distX;
    y = beginY + pct*distY;
  } else {
    Position p = new Position(0,0,0);
    p = (Position)positions.get(countPositions++%positions.size());
    pct = 0.0;
    step = p.speed;
    beginX = x;
    beginY = y;
    endX = p.targetX;
    endY = p.targetY;
    distX = endX - beginX;
    distY = endY - beginY;
  }
  
  fill(255);
  ellipse(x, y, 20, 20);
}

void mousePressed() {
  pct = 0.0;
  beginX = x;
  beginY = y;
  endX = mouseX;
  endY = mouseY;
  distX = endX - beginX;
  distY = endY - beginY;
}

class Position {
  float targetX, targetY, speed;
  Position(float targetX, float targetY, float speed) {
     this.targetX = targetX;
     this.targetY = targetY;
     this.speed = speed;
  } 
}