/* Ball animation classes */

#include "Ball.h"
#include <qtimer.h>
#include <qbitmap.h>
#include <qimage.h>
#include <qpixmap.h>
#include <math.h>
#include <stdio.h>

Ball* Ball::first = 0; 
//QImage Ball::back;
int Ball::sizeX, Ball::sizeY;
double Ball::lightX, Ball::lightY, Ball::lightZ;
QColor Ball::lightColor;
double Ball::rippleCount, Ball::rippleDepth;

/* set global Ball parameter */
void Ball::setSize(int x, int y)
{
  sizeX = x;
  sizeY = y;
  
  invalidate();
}

void Ball::invalidate()
{
  Ball *b;

  /* invalidate all Balls... */
  for(b=first;b!=0;b=b->next)
    b->pm.resize(0,0);
}

void Ball::setLight(int x, int y, int z, const QColor& c)
{
  double len = sqrt(x*x + y*y + z*z);
  
  lightX = x/len;
  lightY = y/len;
  lightZ = z/len;

  lightColor = c;

  invalidate();
}


void Ball::setTexture(double c, double d)
{
  rippleCount = c;
  rippleDepth = d;

  invalidate();
}
  
  

Ball::Ball(const QColor& c, double a, int t)
{
  if (first ==0) {
    sizeX = sizeY = -1;
    setLight();
    setTexture(7,.3);
  }

  bColor = c;
  an = a;
  sina = sin(a), cosa = cos(a);

  zoom= 1.05, flip = 2.0, limit = 0;
  tex = TEX_RIPPLE;

  next = first;
  first = this;
}

Ball::~Ball()
{
  Ball* b;

  if (first == this)
    first = next;
  else {
    for(b = first; b!=0; b=b->next)
      if (b->next == this) break;
    if (b!=0)
      b->next = next;
  }
}
    
QPixmap* Ball::pixmap()
{
  if (pm.isNull() && sizeX>0 && sizeY>0)
    render();
  return &pm;
}

void Ball::render()
{
  int x,y;
  double xx,yy,zz, ll,lll, red,green,blue, tr;

  if (sizeX==0 || sizeY==0) 
    return;

  QImage image(sizeX,sizeY,32);
  image.fill(0);

  double vv=2./(sizeX+sizeY);

  /* Go through all pixels, mapping x/y to (-1..1,-1..1) */
  for(y=0;y<sizeY;y++) {
    yy = (2.*y-sizeY)/(sizeY-2) *zoom;
    for(x=0;x<sizeX;x++) {
      xx = (2.*x-sizeX)/(sizeX-2) *zoom;

      /* Change only if inside the ball */
      zz = 1 - (xx*xx + yy*yy);
      
      if (zz>flip) zz=2*flip-zz;
      else {
	zz -= limit;
      }

      if (zz>-vv) {
	zz = (zz<0) ? 0 : sqrt(zz);

	/* ll: light intensity at this point */ 
	ll = xx*lightX + yy*lightY + zz*lightZ;

	/* some face modification */
	double mapx = xx*(2-zz);
	double mapy = yy*(2-zz);
	double rmapx =  cosa*mapx + sina*mapy; /* rotate */
	double rmapy = -sina*mapx + cosa*mapy;	

	if (tex>0)
	  ll += rippleDepth* cos(rippleCount*rmapx)*cos(rippleCount*rmapy);

	ll = (ll<0.01) ? 0.0 : (ll>.99) ? 1.0 : ll;
	lll = ll*ll;

	//	printf("x %f, y %f, z %f : ll %f lll %f\n", xx,yy,zz,ll,lll);


	/* mix ball+light */
	red   = lll * lightColor.red() +   (1-lll) * bColor.red();
	green = lll * lightColor.green() + (1-lll) * bColor.green();
	blue  = lll * lightColor.blue() +  (1-lll) * bColor.blue();

	/* lightness */
	red   = .2 * bColor.red()   + .8 * ll * red;
	green = .2 * bColor.green() + .8 * ll * green;
	blue  = .2 * bColor.blue()  + .8 * ll * blue;

	image.setPixel(x,y, qRgb( (int)red,  (int)green, (int)blue ));
      }
    }
  }
  const QImage iMask = image.createHeuristicMask();
  QBitmap bMask;
  bMask = iMask;
  pm.convertFromImage( image, 0 );
  pm.setMask(bMask);
}


/* Class BallAnimation */

BallAnimation::BallAnimation(int s, Ball* ball1, Ball* ball2)
{
  QColor c1 = ball1->ballColor();
  double a1 = ball1->angle();
  int r1 = c1.red(), g1 = c1.green(), b1 = c1.blue();

  QColor c2 = ball2->ballColor();
  double a2 = ball2->angle();
  int r2 = c2.red(), g2 = c2.green(), b2 = c2.blue();

  QColor c;
  double t,a;
  int i;

  steps = s;
  s--;
  
  balls.append( new Ball( c1,a1 ) );

  for(i=1; i< s; i++) {
    c.setRgb( r1+(r2-r1)*i/s, g1+(g2-g1)*i/s, b1+(b2-b1)*i/s );
    a = a1+(a2-a1)*i/s;

    balls.append( new Ball( c,a ) );
  }

  balls.append( new Ball( c2,a2 ) );
}
  

/* Class BallPosition */
BallPosition::BallPosition(int xp,int yp, Ball* d)
{
  x=xp; 
  y=yp;
  def=d;
  actStep = -1;
  actType = ANIMATION_STOPPED;
  actAnimation=0;
}


/*  Class BallWidget */

BallWidget::BallWidget( int hz, int bFr, QWidget *parent, const char *name )
  : QWidget(parent,name), positions(MAX_POSITION), animations(MAX_ANIMATION)
{
  int i;
  
  for(i=0;i<MAX_POSITION;i++)
    positions[i] = 0;

  for(i=0;i<MAX_ANIMATION;i++)
    animations[i] = 0;

  freq = hz;
  ballFraction = bFr;
  realSize = -1;
  timer = new QTimer(this);
  connect( timer, SIGNAL(timeout()), SLOT(animate()) );
}

BallWidget::~BallWidget()
{
  if (timer !=0)
    delete timer;
}

void BallWidget::createBlending(int no, int s, Ball* b1, Ball* b2)
{
  if (no<0 || no>= MAX_ANIMATION) return;

  if (animations[no] !=0)
    delete animations[no];

  animations[no] = new BallAnimation(s,b1,b2);
}


/* X, Y are coordinates in a virtual 1000x1000 area */
void BallWidget::createBallPosition(int no, int x, int y, Ball* def)
{
  if (no<0 || no>= MAX_POSITION) return;

  if (positions[no] !=0)
    delete positions[no];

  positions[no] = new BallPosition(x,y, def);
}

void BallWidget::startAnimation(int pos, int anim, int type)
{
  BallPosition *p;

  if (pos<0 || pos>=MAX_POSITION || positions[pos]==0) return;
  if (anim<0 || anim>=MAX_ANIMATION || animations[anim]==0) return;

  p = positions.at(pos);
  p->actAnimation = animations.at(anim);

  /* One step *BEFORE* start */
  p->actStep = -1;
  p->actDir = 1;
  p->actType = type;

  if (!timer->isActive())
    timer->start( 1000 / freq );
}

/* If LOOP: Set to ONESHOT, otherwise set to last frame */
void BallWidget::stopAnimation(int pos)
{
  BallPosition *p;

  if (pos<0 || pos>=MAX_POSITION || positions[pos]==0) return;

  p = positions.at(pos);
  if (p->actType == ANIMATION_STOPPED ||
      p->actAnimation == 0) return;
  
  if (p->actType == ANIMATION_LOOP ||
      p->actType == ANIMATION_CYCLE) {
    p->actType = ANIMATION_FORWARD;
    return;
  }
  /* Set last step: animate() does the rest */
  p->actDir = 1;
  p->actStep = p->actAnimation->steps;
}

void BallWidget::resizeEvent(QResizeEvent *)
{
  int w = width() *10/12, h = height();

  realSize = (w>h) ? h:w;

  Ball::setSize( realSize/ballFraction, realSize/ballFraction );
  repaint();
}

void BallWidget::paintEvent(QPaintEvent *)
{
  paint(this);
}


void BallWidget::paint(QPaintDevice *pd)
{
  int i;
  BallPosition *p;
  int xReal, yReal;

  int w = width(), h = height();

  if (realSize<0) return;

  for(i=0;i<MAX_POSITION;i++) {
    p = positions.at(i);
    if (p==0) continue;

    xReal = (w + p->x * realSize / 500 - Ball::w() )/2;
    yReal = (h + p->y * realSize / 500 - Ball::h() )/2;

    if (p->actAnimation==0 || p->actStep==-1) {
      if (p->def !=0 )
	bitBlt( pd, xReal, yReal, p->def->pixmap() );
    }
    else {
      int s = p->actStep;
      if (s>= p->actAnimation->steps) 
	s = p->actAnimation->steps-1;
      Ball* b = p->actAnimation->balls.at(s);
      bitBlt( pd, xReal, yReal, b->pixmap() );
    }
  }
}

void BallWidget::animate()
{
  bool doAnimation = false;

  int i;
  BallPosition *p;

  for(i=0;i<MAX_POSITION;i++) {
    p = positions.at(i);
    if (p==0) continue;
    
    if (p->actType == ANIMATION_STOPPED ||
	p->actAnimation ==0) continue;
     
    p->actStep += p->actDir;
    if (p->actStep <= -1) {
      p->actDir = 1;
      p->actStep = 1;
      doAnimation = true;
    }
    else if (p->actStep >= p->actAnimation->steps) {
      if (p->actType == ANIMATION_CYCLE) {
	p->actDir = -1;
	p->actStep = p->actAnimation->steps -2;
	doAnimation = true;
      }
      else if (p->actType == ANIMATION_LOOP) {
	p->actStep = 1; /*skip first frame for smooth animation */
	doAnimation = true;
      }
      else {
	p->actType = ANIMATION_STOPPED;
	p->actAnimation = 0;
	emit animationFinished(i);
      }
    }
    else {
      doAnimation = true;
    }      
  }
  if (!doAnimation) {
    timer->stop();
    emit animationsFinished();
  }

  repaint( false );
}


/* Ball Test */


BallTest::BallTest( QWidget *parent, const char *name )
  : BallWidget(10,2,parent,name)
{
  int w,h;

  w = h = 150;
  resize(w,h);
  //  Ball::setSize( w/2, h/2, this );

  Ball *b1 = new Ball( green );
  Ball *b2 = new Ball( yellow );
  Ball *b3 = new Ball( red );
  Ball *b4 = new Ball( red, 3.14/2 );

  createBlending(0,5,b1,b2);
  createBallPosition( 0,250, 250, b1);

  createBlending(1,10,b1,b3);
  createBallPosition(1, 250, 750, b1);

  createBlending(2,15,b3,b2);
  createBallPosition( 2, 750, 250, b3);

  createBlending(3,20,b3,b4);
  createBallPosition(3, 750, 750, b3);
}

/*
void BallTest::paintEvent( QPaintEvent * )
{
  bitBlt(this,0,0, b.pixmap());
}
*/

void BallTest::mousePressEvent( QMouseEvent * )
{
  startAnimation(0,0, ANIMATION_CYCLE);
  startAnimation(1,1);
  startAnimation(2,2);
  startAnimation(3,3, ANIMATION_LOOP);
}

void BallTest::mouseReleaseEvent( QMouseEvent * )
{
  stopAnimation(0);
  stopAnimation(1);
  stopAnimation(3);
}

/* Test...

#include <kapp.h>

int main(int argc, char *argv[])
{
  zoom=.52;
  flip=.85;
  limit=.75;

        KApplication app(argc, argv, "BallTest");
        BallTest top;

	app.setMainWidget( &top );	
	top.show();
        return app.exec();
}

*/
