gluttonous_squid.pde

/* based on:
1. https://www.openprocessing.org/sketch/184838
2. https://www.openprocessing.org/sketch/720376
3. https://www.openprocessing.org/sketch/728303
*/

float maxDistance;
Squid squid;
Stars stars;
void setup() {
  fullScreen();
  colorMode(HSB, 360);
  ellipseMode(CENTER);
  
  maxDistance = sqrt((width / 2) * (width / 2) + (height / 2) * (height / 2)); 
  squid = new Squid(0, 0, 8);
  stars = new Stars(0, 0, 40);
}

void draw() {
  background(0); 
  translate(width / 2, height / 2); 
  
  PVector velocity = velocityByDistanceToCenter();
  
  if (stars.findFood()) {
    squid.grow();
  }
  
  squid.update(velocity); 
  velocity.mult( - 1);
  stars.update(velocity);
  
  stars.display();
  squid.display();
}


PVector velocityByDistanceToCenter() {
  PVector mouse = new PVector(mouseX, mouseY); 
  PVector center = new PVector(width / 2, height / 2); 
  PVector direction = PVector.sub(mouse, center);
  float distance = direction.mag(); 
  direction.normalize();
  float speed = map(distance, 0, maxDistance, 5, 30); 
  direction.mult(speed);
  return direction;
}

class Squid {
  Tentacle[] tens; 
  float scaleRatio;
  PVector location;
  
  Squid(float x, float y, int cnt) {
    tens = new Tentacle[cnt];
    
    //初始化触手
    for (int i = 0; i < tens.length; i++) {
      float theta = map(i, 0, tens.length, 0, TWO_PI); 
      float minHue = map(i, 0, tens.length, 0, 946); 
      float maxHue = map(i + 1, 0, tens.length, 0, 946); 
      tens[i] = new Tentacle(theta, minHue, maxHue);
    }
    
    location  = new PVector(x, y);
  }
  
  void grow() {
    for (int i = 0; i < tens.length; i++) {
      tens[i].addLimb();
    }
  }
  
  void update(PVector velocity) {
    scaleRatio = map(velocity.mag(), 5, 35, 1, 5); 
    location.add(velocity);
    for (Tentacle t : tens) {
      t.update(location.x, location.y);
    }
  }
  
  void display() {
    // transforms
    scale(scaleRatio);
    translate( - location.x, -location.y); 
    	
    
    //触角
    for (int i = 0; i < tens.length; i++) {
      tens[i].display();
    }
    
    //脸
    translate(location.x, location.y); 
    fill(30); 
    stroke(30); 
    strokeWeight(3.5); 
    drawNoiseLoop(0, 0, 30); 
    drawEye(15, 0, 20); 
    drawEye( - 15, 0, 20);
  }
}

void drawNoiseLoop(float cx, float cy, float cr) {
  int cnt = 50; 
  beginShape(); 
  float time = float(frameCount) / 100; 
  for (int i = 0; i <= cnt; i++) {
    float theta = map(i, 0, cnt, 0, TWO_PI); 
    float r = cr * (1 + noise(sin(theta) + 1, cos(theta) + 1, time) * 0.7); 
    float x = cx + r * cos(theta); 
    float y = cy + r * sin(theta); 
    vertex(x, y);
  }
  endShape();
}

void drawEye(float x, float y, int size) {
  float angle = atan2(mouseX - width / 2, mouseY - height / 2);
  pushMatrix();
  
  translate(x, y); 
  
  // first cirlce
  fill(360); 
  stroke(360); 
  ellipse(0, 0, size, size); 
  
  // second circle
  rotate(angle); 
  fill(0); 
  noStroke(); 
  ellipse(size / 5, 0, size / 1.5, size / 1.5); 
  
  popMatrix();
}
class Limb {
  float startX, startY, endX, endY; 
  float offsetX, offsetY; 
  float currentX, currentY; 
  float size; 
  float amt; 
  
  Limb(float _size, float theta) {
    size = _size; 
    offsetX = 6 * cos(theta); 
    offsetY = 6 * sin(theta); 
    amt = 0.4;
  }
  
  void update(float x, float y) {
    startX = x; 
    startY = y; 
    endX = startX + offsetX; 
    endY = startY + offsetY; 
    
    shake(); 
    transition();
  }
  
  void transition() {
    currentX = lerp(currentX, endX, amt); 
    currentY = lerp(currentY, endY, amt);
  }
  
  void shake() {
    endX += (.5 - noise((endX + frameCount) * .008, 0)) * 20; 
    endY += (.5 - noise(0,(endY + frameCount) * .008)) * 20;
  }
  
  void display() {
    //画一条线
    strokeWeight(size + 7); 
    line(startX, startY, currentX, currentY); 
    
    //画一个点
    strokeWeight(size / 2 + 7); 
    point(startX + (offsetX * 1.5), startY + (offsetY * 1.5));
  }
}
class Stars { 
  PVector[] stars;
  PVector center;
  Stars(float x, float y, int cnt) {
    stars = new PVector[cnt];
    for (int i = 0; i < cnt; i++) {
      stars[i] = new PVector(random( - width, width), random( - height, height), random(10, 20));
    }
    center = new PVector(x, y);
  }
  
  void update(PVector velocity) {
    center.add(velocity);
    
    for (int i = 0; i < stars.length; i++) {
      PVector s = stars[i];
      if (velocity.x > 0 && s.x + center.x > width) {
        s.x -= width * 2;
      } else if (velocity.x < 0 && s.x + center.x < - width) {
        s.x += width * 2;
      }
      
      if (velocity.y > 0 && s.y + center.y > height) {
        s.y -= height * 2;
      } else if (velocity.y < 0 && s.y + center.y < - height) {
        s.y += height * 2;
      }
    }
  }
  
  boolean findFood() {
    int len = stars.length;
    PVector food = stars[len - 1];
    PVector location = PVector.add(food, center);
    
    if (location.mag() < 100) {
      food.set(random( - width, width), random( - height, height), random(10, 30));
      return true;
    }
    return false;
  }
  
  void display() {
    pushMatrix();
    translate(center.x, center.y); 
    for (int i = 0; i < stars.length; i++) {
      PVector s = stars[i];
      if (i == stars.length - 1) {
        float hue = map(s.z, 10, 30, 0, 360);
        fill(hue, 360, 360);
        drawStar(s.x, s.y, s.z, s.z);
      } else {
        fill(360);
        ellipse(s.x, s.y, s.z, s.z);
      }
    }
    popMatrix();
  }
  
  void drawStar(float x, float y, float w, float h) {
    pushMatrix();
    float period = 3000;
    float intensity = 5;
    float t = atan(sin((millis() % period) / period * 2 * PI) * intensity) / PI + 0.5;
    float rate = t + 1;
    translate(x, y);
    scale(rate * 3);
    ellipse(0, 0, w, h);
    popMatrix();
  }
}

class Tentacle {
  Limb[] segments = new Limb[5]; 
  float minHue, maxHue; 
  float theta;
  Tentacle(float _theta, float _minHue, float _maxHue) {
    theta = _theta;
    for (int i = 0; i < segments.length; i++) {
      float size = 45 - (i * 1.75); 
      segments[i] = new Limb(size, theta); 
      minHue = _minHue; 
      maxHue = _maxHue;
    }
  }
  
  void addLimb() {
    float size = 45 - segments.length * 1.75;
    int len = segments.length;
    size = size > 4 ? size : 4;
    Limb l = new Limb(size, theta);
    l.currentX = segments[len - 1].endX;
    l.currentY = segments[len - 1].endY;
    segments = (Limb[]) append(segments, l);
  }
  
  void update(float x, float y) {
    for (int i = 0; i < segments.length; i++) {
      if (i == 0) {   
        segments[i].update(x, y);
      } else {   
        segments[i].update(segments[i - 1].currentX, segments[i - 1].currentY);
      }
    }
  }
  
  void display() {
    for (int i = 0; i < segments.length; i++) {
      float hue = map(i, 0, segments.length, minHue, maxHue); 
      int index = int(hue); 
      stroke(colorScale[index]); 
      segments[i].display();
    }
  }
}

int[] colorScale = {#6d3fa9, #6e3faa, #6f3faa, #703faa, #703fab, #713fab, #723fab, #733fac, #743fac, #753fac, 
  #753fac, #763fad, #773fad, #783fad, #793ead, #7a3eae, #7a3eae, #7b3eae, #7c3eae, #7d3eaf, 
  #7e3eaf, #7f3eaf, #803eaf, #803eaf, #813eb0, #823eb0, #833eb0, #843eb0, #853eb0, #863eb0, 
  #863db1, #873db1, #883db1, #893db1, #8a3db1, #8b3db1, #8c3db1, #8d3db2, #8d3db2, #8e3db2, 
  #8f3db2, #903db2, #913db2, #923db2, #933db2, #933db2, #943db2, #953db2, #963db2, #973db2, 
  #983cb3, #993cb3, #9a3cb3, #9b3cb3, #9b3cb3, #9c3cb3, #9d3cb3, #9e3cb3, #9f3cb3, #a03cb3, 
  #a13cb3, #a23cb3, #a23cb3, #a33cb2, #a43cb2, #a53cb2, #a63cb2, #a73cb2, #a83cb2, #a93cb2, 
  #a93cb2, #aa3cb2, #ab3cb2, #ac3cb2, #ad3cb2, #ae3cb2, #af3cb1, #b03cb1, #b03cb1, #b13cb1, 
  #b23cb1, #b33cb1, #b43cb1, #b53cb0, #b63cb0, #b63cb0, #b73cb0, #b83cb0, #b93caf, #ba3caf, 
  #bb3caf, #bc3caf, #bc3caf, #bd3cae, #be3cae, #bf3cae, #c03cae, #c13cae, #c13cad, #c23cad, 
  #c33cad, #c43cac, #c53cac, #c63cac, #c63cac, #c73cab, #c83cab, #c93cab, #ca3daa, #ca3daa, 
  #cb3daa, #cc3da9, #cd3da9, #ce3da9, #ce3da8, #cf3da8, #d03da8, #d13da7, #d23da7, #d23da7, 
  #d33da6, #d43ea6, #d53ea6, #d53ea5, #d63ea5, #d73ea4, #d83ea4, #d83ea4, #d93ea3, #da3ea3, 
  #db3ea2, #db3fa2, #dc3fa1, #dd3fa1, #de3fa1, #de3fa0, #df3fa0, #e03f9f, #e03f9f, #e1409e, 
  #e2409e, #e2409d, #e3409d, #e4409c, #e4409c, #e5419b, #e6419b, #e6419a, #e7419a, #e84199, 
  #e84199, #e94298, #ea4298, #ea4297, #eb4297, #ec4296, #ec4396, #ed4395, #ed4395, #ee4394, 
  #ef4394, #ef4493, #f04492, #f04492, #f14491, #f24491, #f24590, #f34590, #f3458f, #f4458e, 
  #f4468e, #f5468d, #f5468d, #f6468c, #f7478b, #f7478b, #f8478a, #f8478a, #f94889, #f94888, 
  #fa4888, #fa4887, #fb4987, #fb4986, #fb4985, #fc4a85, #fc4a84, #fd4a83, #fd4b83, #fe4b82, 
  #fe4b82, #ff4b81, #ff4c80, #ff4c80, #ff4c7f, #ff4d7e, #ff4d7e, #ff4d7d, #ff4e7c, #ff4e7c, 
  #ff4e7b, #ff4f7a, #ff4f7a, #ff5079, #ff5078, #ff5078, #ff5177, #ff5176, #ff5176, #ff5275, 
  #ff5274, #ff5274, #ff5373, #ff5372, #ff5472, #ff5471, #ff5470, #ff5570, #ff556f, #ff566e, 
  #ff566e, #ff576d, #ff576c, #ff576c, #ff586b, #ff586a, #ff596a, #ff5969, #ff5a68, #ff5a68, 
  #ff5a67, #ff5b66, #ff5b66, #ff5c65, #ff5c64, #ff5d64, #ff5d63, #ff5e62, #ff5e62, #ff5f61, 
  #ff5f61, #ff6060, #ff605f, #ff615f, #ff615e, #ff625d, #ff625d, #ff635c, #ff635b, #ff645b, 
  #ff645a, #ff6559, #ff6559, #ff6658, #ff6658, #ff6757, #ff6756, #ff6856, #ff6855, #ff6954, 
  #ff6954, #ff6a53, #ff6a53, #ff6b52, #ff6c51, #ff6c51, #ff6d50, #ff6d50, #ff6e4f, #ff6e4e, 
  #ff6f4e, #ff704d, #ff704d, #ff714c, #ff714b, #ff724b, #ff724a, #ff734a, #ff7449, #ff7449, 
  #ff7548, #ff7548, #ff7647, #ff7746, #ff7746, #ff7845, #ff7845, #ff7944, #ff7a44, #ff7a43, 
  #ff7b43, #ff7c42, #ff7c42, #ff7d41, #ff7d41, #ff7e40, #ff7f40, #ff7f3f, #ff803f, #ff813e, 
  #ff813e, #ff823e, #ff823d, #ff833d, #ff843c, #ff843c, #ff853b, #ff863b, #ff863b, #ff873a, 
  #ff883a, #ff8839, #ff8939, #ff8a39, #ff8a38, #ff8b38, #ff8c37, #ff8c37, #ff8d37, #ff8e36, 
  #ff8e36, #fe8f36, #fe9035, #fe9035, #fd9135, #fd9234, #fc9234, #fc9334, #fc9433, #fb9433, 
  #fb9533, #fa9633, #fa9732, #f99732, #f99832, #f89932, #f89931, #f89a31, #f79b31, #f79b31, 
  #f69c30, #f69d30, #f59d30, #f59e30, #f49f30, #f4a030, #f3a02f, #f3a12f, #f2a22f, #f2a22f, 
  #f1a32f, #f1a42f, #f0a42f, #f0a52e, #efa62e, #efa62e, #eea72e, #eda82e, #eda92e, #eca92e, 
  #ecaa2e, #ebab2e, #ebab2e, #eaac2e, #eaad2e, #e9ad2e, #e9ae2e, #e8af2e, #e7b02e, #e7b02e, 
  #e6b12e, #e6b22e, #e5b22e, #e5b32e, #e4b42e, #e3b42e, #e3b52e, #e2b62e, #e2b62e, #e1b72e, 
  #e1b82e, #e0b92e, #dfb92e, #dfba2f, #debb2f, #debb2f, #ddbc2f, #dcbd2f, #dcbd2f, #dbbe30, 
  #dbbf30, #dabf30, #dac030, #d9c130, #d8c131, #d8c231, #d7c331, #d7c331, #d6c431, #d5c532, 
  #d5c532, #d4c632, #d4c733, #d3c733, #d2c833, #d2c933, #d1c934, #d1ca34, #d0cb34, #cfcb35, 
  #cfcc35, #cecd35, #cecd36, #cdce36, #cdce36, #cccf37, #cbd037, #cbd038, #cad138, #cad238, 
  #c9d239, #c8d339, #c8d43a, #c7d43a, #c7d53b, #c6d53b, #c6d63c, #c5d73c, #c5d73d, #c4d83d, 
  #c3d83e, #c3d93e, #c2da3f, #c2da3f, #c1db40, #c1db40, #c0dc41, #c0dd41, #bfdd42, #bfde42, 
  #bede43, #bddf44, #bddf44, #bce045, #bce045, #bbe146, #bbe247, #bae247, #bae348, #b9e349, 
  #b9e449, #b8e44a, #b8e54b, #b7e54b, #b7e64c, #b6e64d, #b6e74d, #b6e74e, #b5e84f, #b5e94f, 
  #b4e950, #b4ea51, #b3ea52, #b3eb52, #b2eb53, #b2eb54, #b2ec55, #b1ec55, #b1ed56, #b0ed57, 
  #b0ee58, #b0ee58, #afef59, #afef5a, #aeef5a, #adf05a, #acf059, #abf059, #aaf059, #a9f059, 
  #a8f058, #a7f058, #a6f158, #a4f158, #a3f158, #a2f158, #a1f157, #a0f157, #9ff157, #9ef257, 
  #9df257, #9cf257, #9bf257, #9af257, #99f257, #98f257, #97f356, #96f356, #95f356, #94f356, 
  #93f356, #92f356, #91f356, #90f356, #8ff356, #8ef456, #8df456, #8cf456, #8bf456, #8af456, 
  #89f456, #88f457, #87f457, #86f457, #85f457, #84f557, #82f557, #81f557, #80f557, #7ff557, 
  #7ef557, #7df558, #7cf558, #7bf558, #7af558, #79f558, #78f558, #77f559, #76f659, #75f659, 
  #74f659, #73f659, #72f65a, #71f65a, #70f65a, #70f65a, #6ff65b, #6ef65b, #6df65b, #6cf65c, 
  #6bf65c, #6af65c, #69f65c, #68f65d, #67f65d, #66f65d, #65f65e, #64f65e, #63f65e, #62f65f, 
  #61f65f, #60f65f, #5ff660, #5ff660, #5ef661, #5df661, #5cf661, #5bf662, #5af662, #59f663, 
  #58f663, #57f663, #56f664, #56f664, #55f665, #54f665, #53f666, #52f566, #51f567, #51f567, 
  #50f567, #4ff568, #4ef568, #4df569, #4cf569, #4cf56a, #4bf56a, #4af56b, #49f46c, #48f46c, 
  #48f46d, #47f46d, #46f46e, #45f46e, #45f46f, #44f46f, #43f470, #42f370, #42f371, #41f372, 
  #40f372, #3ff373, #3ff373, #3ef274, #3df274, #3df275, #3cf276, #3bf276, #3af277, #3af178, 
  #39f178, #38f179, #38f179, #37f17a, #36f07b, #36f07b, #35f07c, #35f07d, #34f07d, #33ef7e, 
  #33ef7e, #32ef7f, #32ef80, #31ee80, #30ee81, #30ee82, #2fee82, #2fed83, #2eed84, #2eed84, 
  #2ded85, #2dec86, #2cec86, #2cec87, #2bec88, #2beb89, #2aeb89, #2aeb8a, #29ea8b, #29ea8b, 
  #28ea8c, #28ea8d, #27e98d, #27e98e, #26e98f, #26e88f, #25e890, #25e891, #25e792, #24e792, 
  #24e793, #23e694, #23e694, #23e695, #22e596, #22e596, #22e597, #21e498, #21e499, #21e399, 
  #20e39a, #20e39b, #20e29b, #1fe29c, #1fe29d, #1fe19e, #1ee19e, #1ee09f, #1ee0a0, #1ee0a0, 
  #1ddfa1, #1ddfa2, #1ddea2, #1ddea3, #1cdda4, #1cdda5, #1cdda5, #1cdca6, #1cdca7, #1bdba7, 
  #1bdba8, #1bdaa9, #1bdaa9, #1bd9aa, #1ad9ab, #1ad9ab, #1ad8ac, #1ad8ad, #1ad7ad, #1ad7ae, 
  #1ad6af, #1ad6af, #19d5b0, #19d5b1, #19d4b1, #19d4b2, #19d3b3, #19d3b3, #19d2b4, #19d2b5, 
  #19d1b5, #19d1b6, #19d0b7, #19d0b7, #19cfb8, #19cfb9, #19ceb9, #19ceba, #19cdba, #19cdbb, 
  #19ccbc, #19cbbc, #19cbbd, #19cabe, #19cabe, #19c9bf, #19c9bf, #19c8c0, #19c8c1, #19c7c1, 
  #19c7c2, #19c6c2, #19c5c3, #19c5c3, #1ac4c4, #1ac4c5, #1ac3c5, #1ac3c6, #1ac2c6, #1ac1c7, 
  #1ac1c7, #1ac0c8, #1bc0c8, #1bbfc9, #1bbfc9, #1bbeca, #1bbdca, #1bbdcb, #1cbccb, #1cbccc, 
  #1cbbcc, #1cbacd, #1cbacd, #1db9ce, #1db9ce, #1db8cf, #1db7cf, #1db7d0, #1eb6d0, #1eb5d1, 
  #1eb5d1, #1eb4d2, #1fb4d2, #1fb3d2, #1fb2d3, #1fb2d3, #20b1d4, #20b0d4, #20b0d4, #20afd5, 
  #21afd5, #21aed6, #21add6, #22add6, #22acd7, #22abd7, #23abd7, #23aad8, #23aad8, #24a9d8, 
  #24a8d9, #24a8d9, #25a7d9, #25a6da, #25a6da, #26a5da, #26a4db, #26a4db, #27a3db, #27a2db, 
  #27a2dc, #28a1dc, #28a1dc, #29a0dc, #299fdd, #299fdd, #2a9edd, #2a9ddd, #2a9dde, #2b9cde, 
  #2b9bde, #2c9bde, #2c9ade, #2c99de, #2d99df, #2d98df, #2e97df, #2e97df, #2f96df, #2f95df, 
  #2f95e0, #3094e0, #3093e0, #3193e0, #3192e0, #3292e0, #3291e0, #3290e0, #3390e0, #338fe0, 
  #348ee1, #348ee1, #358de1, #358ce1, #368ce1, #368be1, #368ae1, #378ae1, #3789e1, #3888e1, 
  #3888e1, #3987e1, #3987e1, #3a86e1, #3a85e1, #3b85e1, #3b84e1, #3c83e1, #3c83e1, #3d82e1, 
  #3d81e0, #3d81e0, #3e80e0, #3e7fe0, #3f7fe0, #3f7ee0, #407ee0, #407de0, #417ce0, #417ce0, 
  #427bdf, #427adf, #437adf, #4379df, #4479df, #4478df, #4577de, #4577de, #4676de, #4675de, 
  #4675de, #4774dd, #4774dd, #4873dd, #4872dd, #4972dd, #4971dc, #4a71dc, #4a70dc, #4b6fdc, 
  #4b6fdb, #4c6edb, #4c6edb, #4d6dda, #4d6cda, #4e6cda, #4e6bda, #4e6bd9, #4f6ad9, #4f69d9, 
  #5069d8, #5068d8, #5168d8, #5167d7, #5267d7, #5266d7, #5265d6, #5365d6, #5364d6, #5464d5, 
  #5463d5, #5563d4, #5562d4, #5661d4, #5661d3, #5660d3, #5760d2, #575fd2, #585fd1, #585ed1, 
  #595ed1, #595dd0, #595dd0, #5a5ccf, #5a5ccf, #5b5bce, #5b5ace, #5b5acd, #5c59cd, #5c59cc, 
  #5d58cc, #5d58cb, #5d57cb, #5e57ca, #5e56ca, #5f56c9, #5f55c9, #5f55c8, #6054c8, #6054c7, 
  #6053c7, #6153c6, #6152c6, #6152c5, #6251c4, #6251c4, #6250c3, #6350c3, #634fc2, #634fc2, 
  #644ec1, #644ec0, #644ec0, #654dbf, #654dbf, #654cbe, #664cbd, #664bbd, #664bbc, #674abc, 
  #674abb, #6749ba, #6849ba, #6849b9, #6848b8, #6848b8, #6947b7, #6947b6, #6946b6, #6946b5, 
  #6a46b4, #6a45b4, #6a45b3, #6a44b2, #6b44b2, #6b44b1, #6b43b0, #6b43b0, #6c42af, #6c42ae, 
  #6c42ae, #6c41ad, #6c41ac, #6d40ac, #6d40ab, #6d40aa};