euglena/lib/video/examples/Capture/HsvSpace/HsvSpace.pde

/**
 * HSV Space
 * by Ben Fry. 
 *
 * Arrange the pixels from live video into the HSV Color Cone.
 */
 
import processing.video.*;
import java.awt.Color;

Capture video;
int count;
boolean cheatScreen = true;

static final float BOX_SIZE        = 0.75;
static final float CONE_HEIGHT     = 1.2;
static final float MAX_RADIUS      = 10;
static final float ROT_INCREMENT   = 3.0;
static final float TRANS_INCREMENT = 1;
static final float STEP_AMOUNT     = 0.1;

Tuple[] farbe;
Tuple[] trans;

float[] hsb = new float[3];

float leftRightAngle;
float upDownAngle;
float fwdBackTrans;
float upDownTrans;
float leftRightTrans;
boolean motion;

boolean blobby = false;


void setup() {
  size(640, 480, P3D);

  // This the default video input, see the GettingStartedCapture 
  // example if it creates an error
  video = new Capture(this, 160, 120);
  
  // Start capturing the images from the camera
  video.start();  
  
  count = video.width * video.height;

  sphereDetail(60);

  upDownTrans = 0;
  leftRightTrans = 0;
  motion = false;

  leftRightAngle = 101.501297;
  upDownAngle = -180.098694;
  fwdBackTrans = 14.800003;

  farbe = new Tuple[count];
  trans = new Tuple[count];
  for (int i = 0; i < count; i++) {
    farbe[i] = new Tuple();
    trans[i] = new Tuple();
  }
}


void draw() {
  background(0);

  if (!blobby) {
    lights();
  }
  
  pushMatrix();
  translate(width/2, height/2);
  scale(min(width, height) / 10.0);

  translate(0, 0, -20 + fwdBackTrans);
  rotateY(radians(36 + leftRightAngle)); //, 0, 1, 0);
  rotateX(radians(-228 + upDownAngle)); //, 1, 0, 0);

  strokeWeight(0.1);
  if (blobby) {    
    stroke(0.35, 0.35, 0.25, 0.15);    
    wireCone(MAX_RADIUS, MAX_RADIUS * CONE_HEIGHT, 18, 18);
  } 
  else {
    stroke(0.35, 0.35, 0.25, 0.25);
    wireCone(MAX_RADIUS, MAX_RADIUS * CONE_HEIGHT, 180, 18);
  }

  noStroke();
  video.loadPixels();
  for (int i = 0; i < count; i++) {
    int pixelColor = video.pixels[i];
    int r = (pixelColor >> 16) & 0xff;
    int g = (pixelColor >> 8) & 0xff;
    int b = pixelColor & 0xff;
    Color.RGBtoHSB(r, g, b, hsb);

    float radius = hsb[1] * hsb[2];
    float angle = hsb[0] * 360.0 * DEG_TO_RAD;
    float nx = MAX_RADIUS * radius * cos(angle);
    float ny = MAX_RADIUS * radius * sin(angle);
    float nz = hsb[2] * MAX_RADIUS * CONE_HEIGHT;

    trans[i].set(trans[i].x - (trans[i].x - nx)*STEP_AMOUNT,
                 trans[i].y - (trans[i].y - ny)*STEP_AMOUNT,
                 trans[i].z - (trans[i].z - nz)*STEP_AMOUNT);

    farbe[i].set(farbe[i].x - (farbe[i].x - r)*STEP_AMOUNT,
                 farbe[i].y - (farbe[i].y - g)*STEP_AMOUNT,
                 farbe[i].z - (farbe[i].z - b)*STEP_AMOUNT);

    pushMatrix();
    farbe[i].phil();
    trans[i].tran();

    rotate(radians(45), 1, 1, 0);
    if (blobby) {
      sphere(BOX_SIZE * 2); //, 20, 20);
    } else {
      box(BOX_SIZE);
    }

    popMatrix();
  }
  popMatrix();

  if (motion) {
    upDownAngle--;
    leftRightAngle--;
  }

  if (cheatScreen) {
    image(video, 0, height - video.height);
  }
}


void captureEvent(Capture c) {
  c.read();
}


void keyPressed() {
  switch (key) {
  case 'g': 
    saveFrame(); 
    break;
  case 'c': 
    cheatScreen = !cheatScreen; 
    break;

  case 'm': 
    motion = !motion; 
    break;
  case '=': 
    fwdBackTrans += TRANS_INCREMENT; 
    break;
  case '-': 
    fwdBackTrans -= TRANS_INCREMENT; 
    break;
  case 'b': 
    blobby = !blobby; 
    break;
  }
}


void mouseDragged() {
  float dX, dY;

  switch (mouseButton) {
  case LEFT:  // left right up down
    dX = pmouseX - mouseX;
    dY = pmouseY - mouseY;
    leftRightAngle -= dX * 0.2;
    upDownAngle += dY * 0.4;
    break;

  case CENTER:
    dX = pmouseX - mouseX;
    dY = pmouseY - mouseY;
    leftRightTrans -= TRANS_INCREMENT * dX;
    upDownTrans -= TRANS_INCREMENT * dY;
    break;

  case RIGHT:  // in and out
    dY = (float) (pmouseY - mouseY);
    fwdBackTrans -= TRANS_INCREMENT * dY;
    break;
  }
}


void wireCone(float radius, float height, int stepX, int stepY) {
  int steps = 10;
  stroke(40);
  for (int i = 0; i < steps; i++) {
    float angle = map(i, 0, steps, 0, TWO_PI);
    float x = radius * cos(angle);
    float y = radius * sin(angle);
    line(x, y, height, 0, 0, 0);
  }
  noFill();
  pushMatrix();
  translate(0, 0, height);
  ellipseMode(CENTER);
  ellipse(0, 0, radius, radius);
  popMatrix();
}