void Ball::draw( const gl::VboMesh &mesh, bool useMotionBlur )
{
// store the current modelview matrix
gl::pushModelView();
if(useMotionBlur) {
// determine the number of balls that make up the motion blur trail (minimum of 3, maximum of 30)
float trailsize = math<float>::clamp( math<float>::floor(mPrevPosition.distance(mPosition)), 3.0f, 30.0f );
float segments = trailsize - 1.0f;
// draw ball with motion blur (using additive blending)
gl::color( mColor / trailsize );
Vec2f offset(0.0f, 0.0f);
for(size_t i=0;i<trailsize;++i) {
Vec2f difference = mPrevPosition.lerp( i / segments, mPosition ) - offset;
offset += difference;
gl::translate( difference );
gl::draw( mesh );
}
}
else {
// draw ball without motion blur
gl::color( mColor );
gl::translate( mPosition );
gl::draw( mesh );
}
// restore the modelview matrix
gl::popModelView();
//
mHasBeenDrawn = true;
}
void Ball::draw( const gl::VboMesh &mesh, bool useMotionBlur )
{
float trailsize = math<float>::clamp( math<float>::floor(mPrevPosition.distance(mPosition)), 3.0f, 30.0f );
float segments = trailsize - 1.0f;
gl::pushModelView();
if(useMotionBlur) {
// draw ball with motion blur (using additive blending)
gl::color( mColor / trailsize );
Vec2f offset(0.0f, 0.0f);
for(size_t i=0;i<trailsize;++i) {
Vec2f difference = mPrevPosition.lerp( i / segments, mPosition ) - offset;
offset += difference;
gl::translate( difference );
gl::draw( mesh );
}
}
else {
// draw ball without motion blur
gl::color( mColor );
gl::translate( mPosition );
gl::draw( mesh );
}
gl::popModelView();
//
mHasBeenDrawn = true;
}
