전 자료

우크리스마스...

int step = 12;
int count = 0;
int lightNum = 200;

float tr_scale;
float tr_angle;
float tr_length;
float tr_startd;
float tr_startx;
float tr_starty;
float offset = -90;
float triangle = 30;


Light[] lights = {};

PGraphics backPg;
PGraphics frontPg;


void setup(){
  size (1366, 768);
  colorMode(RGB, 256);
  background(255);

  frontPg = createGraphics(width, height);
  backPg  = createGraphics(width, height);

  createLayer(backPg, 40, false);
  createLayer(frontPg, 20, true);

  for (int i = 0; i < lightNum; i++) {
    lights = (Light[])append(lights, new Light());
  }
}

void draw() {
  image(backPg, 0, 0);

  for (int i = 0; i < lightNum; i++) {
    lights[i].draw();
  }

  image(frontPg, 0, 0);
}


void createLayer(PGraphics context, int num, boolean hasBg) {
  tr_scale  = 0.99;
  tr_angle  = 24.0;
  tr_length = 180.0;
  tr_startd = 0.0;
  tr_startx = width / 2;
  tr_starty = height;

  context.beginDraw();

  if (hasBg == true) {
    backDraw(context);
  }


  createTree (context, tr_startx, tr_starty, tr_length, tr_startd, step);

  for (int i = 0; i < num; i++) {
    if (hasBg == true) {
      backDraw(context);
    }

    if (count == step) {
      count = 0;
      createTree(context, random (0, width), tr_starty, random(tr_length), tr_startd, step);
    }
  }

  context.endDraw();
}

void createTree (PGraphics context, float x01, float y01, float len, float deg, int n){
  context.stroke(color(#00695C, float(5 / (n + 1))));

  context.strokeWeight(int ((n + 1) / 4));

  float x02 = x01 + len * cos(radians(deg + offset));
  float y02 = y01 + len * sin(radians(deg + offset));

  context.line(x01, y01, x02, y02);

  if (n > 0) {
    float deg01 = random(-tr_angle, triangle);
    float scl01 = random(random(10, 20), len * tr_scale);
    createTree(context, x02, y02, scl01, deg + deg01, n - 1);

    float deg02 = random(-tr_angle, triangle);
    float scl02 = random(random(10, 20), len * tr_scale);
    createTree(context, x02, y02, scl02, deg + deg02, n - 1);
  }

  count = n;
}

void backDraw(PGraphics context) {
  context.noStroke();
  context.fill(#2a2f47, 9.5);

  context.rectMode(CORNER);

  context.rect(0, 0, width, height);
}

class Light {
  float x, y, brightness;
  float cnt;
  float v;

  Light() {
    x = random(width);
    y = random(height);
    cnt = 0;
    v = 0.6;
  }

  void draw() {
    noStroke();

    fill(color(#FFFF00, round(cnt -0.5)));
    ellipse(x + random(-1, 1), y + random(-1, 1), 8 + round(cnt / 10), 8 + round(cnt / 10));

    fill(color(#FFFF00, round(cnt)));
    ellipse(x, y, 5, 5);

    cnt += (v + random(-0.1, 0.5));

    if (cnt > 20.0) {
      v = -0.4;
    }

    if (cnt < 1.0) {
      v = 0.4;
    }
  }
}