#import <math.h>

#import "sprite.h"

@implementation Sprite

-(id) initWithX:(double)initX y:(double)initY radius:(double)r
{
  [super init];

  x = initX;
  y = initY;
  vx = 0.0;
  vy = 0.0;
  radius = r;
  color = [[UIColor blackColor] retain];
  state = 0;
  stateTime = 0.0;

  return self;
}
  
-(id) initWithX:(double)initX y:(double)initY vx:(double)initVx vy:(double)initVy radius:(double)r
{
  [super init];

  x = initX;
  y = initY;
  vx = initVx;
  vy = initVy;
  radius = r;
  color = [[UIColor blackColor] retain];
  state = STATE_NORMAL;
  stateTime = 0.0;

  return self;
}

-(id) initWithX:(double)initX y:(double)initY vx:(double)initVx vy:(double)initVy radius:(double)r color:(UIColor *)c
{
  [super init];

  x = initX;
  y = initY;
  vx = initVx;
  vy = initVy;
  radius = r;
  color = [c retain];
  state = 0;
  stateTime = 0.0;

  return self;
}

-(double) getX
{
  return x;
}

-(double) getY
{
  return y;
}

-(UIColor*) getColor
{
  return color;
}

-(double) getMaximumSpeed
{
  return 1e+10;
}

-(void) setVelocityX:(double)newVx y:(double)newVy
{
  vx = newVx;
  vy = newVy;

  // limit speed to max velocity

  double v = sqrt(vx * vx + vy * vy);
  double maxV = [self getMaximumSpeed];

  if (v > maxV)
    {
      vx = vx / (v / maxV);
      vy = vy / (v / maxV);
    }
}

-(double) getBoundingRadius
{
  return radius;
}

-(BOOL) collidesWith:(Sprite*)s
{
  double dx = x - [s getX];
  double dy = y - [s getY];
  double dist = sqrt(dx * dx + dy * dy);

  return (dist < radius + [s getBoundingRadius]);
}

-(void) updateForTime:(double)t model:(GameModel*)m
{
  stateTime += t;

  x += vx * t;
  y += vy * t;
}

-(int) getState
{
  return state;
}

-(void) setState:(int)s
{
  state = s;
  stateTime = 0.0;
}

-(double) getStateTime
{
  return stateTime;
}

-(void) dealloc
{
  [color release];
  
  [super dealloc];
}
@end