/**
 * Future Calligraphy IV
 * by Joseph Gray
 * 
 * March 5th 2009
 *
 */

float distance = 0;
float px = 0, py = 0;
int rand = 0, prevRand = 0, randDistance = 10;
int i=0;
//
int curveMod = 30;
//
float randX = 0, randY = 0, prevRandX = 0,  prevRandY = 0;

// effects scale
int mod = 5;
int newOffX = -mod;
int newOffY = -mod;
int newWidth = (mod*2)+width;
int newHeight = (mod*2)+height;


void setup() {
  size(400, 400);
  frameRate(30);
  cursor(CROSS);
  smooth();
}

void draw() {
  if (focused) {


    //
    ++i;
    if (i>255) i=222;
    fill(255, 255, i, 11);
    noStroke();
    rect(0, 0, width, height);
    //
    randDistance = abs(prevRand-rand);
    rand = round(random(randDistance+50));
    distance = abs(pmouseX-mouseX)*.5;

    stroke(10, 0, 255-i-33, 255);
    strokeWeight((distance+rand)*.1);

    

    randX = mouseX+(((curveMod*distance)*.5)-random((curveMod*distance)));
    randY = mouseY+(((curveMod*distance)*.5)-random((curveMod*distance)));

    bezier(pmouseX, pmouseY, prevRandX, prevRandY, randX, randY, mouseX, mouseY);
    //
    prevRand = rand;
    prevRandX = randX;  
    prevRandY = randY;
    //
    filter(DILATE);
    blend(0, 0, width, height, -2, -1, width+2, height+1, BLEND);
    filter(ERODE);
    filter(INVERT);
    blend(0, 0, width, height, newOffX, newOffY, newWidth, newHeight, OVERLAY);
    filter(DILATE);
    filter(INVERT);
    //
    if(mousePressed) {
      blend(0, 0, width, height, newOffX, newOffY, newWidth, newHeight, ADD);
      filter(DILATE);
    }

  }
}