void frame_box_move_rotate(frame_box *src, int16_t angle, int16_t x_c, int16_t y_c, frame_box *dst1, frame_box *dst2)
{
float sin_ = sin_deg(angle);
float cos_ = cos_deg(angle);
if ( sin_ < 0.0 )
{
if ( cos_ < 0.0 )
{
dst1->x1 = x_c + ((src->x2 - x_c) * cos_) - ((src->y1 - y_c) * sin_);
dst1->y1 = y_c + ((src->x2 - x_c) * sin_) + ((src->y1 - y_c) * cos_);
dst1->x2 = x_c + ((src->x1 - x_c) * cos_) - ((src->y2 - y_c) * sin_);
dst1->y2 = y_c + ((src->x1 - x_c) * sin_) + ((src->y2 - y_c) * cos_);
dst2->x1 = -((src->y2 - src->y1) * sin_);
dst2->y1 = (src->y2 - src->y1) * cos_;
dst2->x2 = -(cos_ * (src->x2 - src->x1));
dst2->y2 = -(sin_ * (src->x2 - src->x1));
}
else
{
dst1->x1 = x_c + ((src->x1 - x_c) * cos_) - ((src->y1 - y_c) * sin_);
dst1->y1 = y_c + ((src->x1 - x_c) * sin_) + ((src->y1 - y_c) * cos_);
dst1->x2 = x_c + ((src->x2 - x_c) * cos_) - ((src->y2 - y_c) * sin_);
dst1->y2 = y_c + ((src->x2 - x_c) * sin_) + ((src->y2 - y_c) * cos_);
dst2->x1 = (src->x2 - src->x1) * cos_;
dst2->y1 = (src->x2 - src->x1) * sin_;
dst2->x2 = -(sin_ * (src->y2 - src->y1));
dst2->y2 = cos_ * (src->y2 - src->y1);
}
}
else
{
if ( cos_ < 0.0 )
{
dst1->x1 = x_c + ((src->x2 - x_c) * cos_) - ((src->y2 - y_c) * sin_);
dst1->y1 = y_c + ((src->y2 - y_c) * cos_) + ((src->x2 - x_c) * sin_);
dst1->x2 = x_c + ((src->x1 - x_c) * cos_) - ((src->y1 - y_c) * sin_);
dst1->y2 = y_c + ((src->y1 - y_c) * cos_) + ((src->x1 - x_c) * sin_);
dst2->x1 = -((src->x2 - src->x1) * cos_);
dst2->y1 = -((src->x2 - src->x1) * sin_);
dst2->x2 = sin_ * (src->y2 - src->y1);
dst2->y2 = -(cos_ * (src->y2 - src->y1));
}
else
{
dst1->x1 = x_c + ((src->x1 - x_c) * cos_) - ((src->y2 - y_c) * sin_);
dst1->y1 = y_c + ((src->y2 - y_c) * cos_) + ((src->x1 - x_c) * sin_);
dst1->x2 = x_c + ((src->x2 - x_c) * cos_) - ((src->y1 - y_c) * sin_);
dst1->y2 = y_c + ((src->y1 - y_c) * cos_) + ((src->x2 - x_c) * sin_);
dst2->x1 = (src->y2 - src->y1) * sin_;
dst2->y1 = -((src->y2 - src->y1) * cos_);
dst2->x2 = cos_ * (src->x2 - src->x1);
dst2->y2 = sin_ * (src->x2 - src->x1);
}
}
}
/*****************************************************************************
* Draw a faceted latitude band of the Boing ball.
*
* Parms: long_lo, long_hi
* Low and high longitudes of slice, resp.
*****************************************************************************/
void DrawBoingBallBand( GLfloat long_lo,
GLfloat long_hi )
{
vertex_t vert_ne; /* "ne" means south-east, so on */
vertex_t vert_nw;
vertex_t vert_sw;
vertex_t vert_se;
vertex_t vert_norm;
GLfloat lat_deg;
static int colorToggle = 0;
/*
* Iterate thru the points of a latitude circle.
* A latitude circle is a 2D set of X,Z points.
*/
for ( lat_deg = 0;
lat_deg <= (360 - STEP_LATITUDE);
lat_deg += STEP_LATITUDE )
{
/*
* Color this polygon with red or white.
*/
if ( colorToggle )
glColor3f( 0.8f, 0.1f, 0.1f );
else
glColor3f( 0.95f, 0.95f, 0.95f );
#if 0
if ( lat_deg >= 180 )
if ( colorToggle )
glColor3f( 0.1f, 0.8f, 0.1f );
else
glColor3f( 0.5f, 0.5f, 0.95f );
#endif
colorToggle = ! colorToggle;
/*
* Change color if drawing shadow.
*/
if ( drawBallHow == DRAW_BALL_SHADOW )
glColor3f( 0.35f, 0.35f, 0.35f );
/*
* Assign each Y.
*/
vert_ne.y = vert_nw.y = (float) cos_deg(long_hi) * RADIUS;
vert_sw.y = vert_se.y = (float) cos_deg(long_lo) * RADIUS;
/*
* Assign each X,Z with sin,cos values scaled by latitude radius indexed by longitude.
* Eg, long=0 and long=180 are at the poles, so zero scale is sin(longitude),
* while long=90 (sin(90)=1) is at equator.
*/
vert_ne.x = (float) cos_deg( lat_deg ) * (RADIUS * (float) sin_deg( long_lo + STEP_LONGITUDE ));
vert_se.x = (float) cos_deg( lat_deg ) * (RADIUS * (float) sin_deg( long_lo ));
vert_nw.x = (float) cos_deg( lat_deg + STEP_LATITUDE ) * (RADIUS * (float) sin_deg( long_lo + STEP_LONGITUDE ));
vert_sw.x = (float) cos_deg( lat_deg + STEP_LATITUDE ) * (RADIUS * (float) sin_deg( long_lo ));
vert_ne.z = (float) sin_deg( lat_deg ) * (RADIUS * (float) sin_deg( long_lo + STEP_LONGITUDE ));
vert_se.z = (float) sin_deg( lat_deg ) * (RADIUS * (float) sin_deg( long_lo ));
vert_nw.z = (float) sin_deg( lat_deg + STEP_LATITUDE ) * (RADIUS * (float) sin_deg( long_lo + STEP_LONGITUDE ));
vert_sw.z = (float) sin_deg( lat_deg + STEP_LATITUDE ) * (RADIUS * (float) sin_deg( long_lo ));
/*
* Draw the facet.
*/
glBegin( GL_POLYGON );
CrossProduct( vert_ne, vert_nw, vert_sw, &vert_norm );
glNormal3f( vert_norm.x, vert_norm.y, vert_norm.z );
glVertex3f( vert_ne.x, vert_ne.y, vert_ne.z );
glVertex3f( vert_nw.x, vert_nw.y, vert_nw.z );
glVertex3f( vert_sw.x, vert_sw.y, vert_sw.z );
glVertex3f( vert_se.x, vert_se.y, vert_se.z );
glEnd();
#if BOING_DEBUG
printf( "----------------------------------------------------------- \n" );
printf( "lat = %f long_lo = %f long_hi = %f \n", lat_deg, long_lo, long_hi );
printf( "vert_ne x = %.8f y = %.8f z = %.8f \n", vert_ne.x, vert_ne.y, vert_ne.z );
printf( "vert_nw x = %.8f y = %.8f z = %.8f \n", vert_nw.x, vert_nw.y, vert_nw.z );
printf( "vert_se x = %.8f y = %.8f z = %.8f \n", vert_se.x, vert_se.y, vert_se.z );
printf( "vert_sw x = %.8f y = %.8f z = %.8f \n", vert_sw.x, vert_sw.y, vert_sw.z );
#endif
}
/*
* Toggle color so that next band will opposite red/white colors than this one.
*/
colorToggle = ! colorToggle;
/*
* This circular band is done.
*/
return;
}
void ball::calculateNewDeltasByAngle() {
//angle = atan(tan(angle));
dx = speed_mult * cos_deg(angle);
dy = speed_mult * sin_deg(angle);
}
