void WisteriaApp::update()
{
// Iterate all the blossoms, update each one and notice if they are all idle
bool isIdle = true;
for( vector<Branch>::iterator blossomIt = mBlossoms.begin(); blossomIt != mBlossoms.end(); ++blossomIt ) {
blossomIt->update();
if( blossomIt->isAlive() )
isIdle = false;
}
if( isIdle && ( ! mIsIdle ) ) {
mIsIdle = true; // first frame of idleness
mIdleFrames = 0;
}
else if( isIdle ) { // the blossoms have all not changed in a while, let's clear them out and put up some new ones
if( mIdleFrames++ > IDLE_RESTART_FRAMES ) {
// clear the context
mOffscreenContext.setSourceRgb( 0.23f, 0.23f, 0.23f );
mOffscreenContext.paint();
mBlossoms.clear();
mBlossoms.push_back( Branch( Vec2f( Rand::randFloat( WIDTH ), Rand::randFloat( HEIGHT ) ), Branch::randomHue(), 0 ) );
mBlossoms.push_back( Branch( Vec2f( Rand::randFloat( WIDTH ), Rand::randFloat( HEIGHT ) ), Branch::randomHue(), 180 ) );
mBlossoms.push_back( Branch( Vec2f( Rand::randFloat( WIDTH ), Rand::randFloat( HEIGHT ) ), Branch::randomHue(), 320 ) );
mIsIdle = false;
}
}
}
void CairoBasicApp::renderScene( cairo::Context &ctx )
{
// clear the context with our radial gradient
cairo::GradientRadial radialGrad( getWindowCenter(), 0, getWindowCenter(), getWindowWidth() );
radialGrad.addColorStop( 0, Color( 1, 1, 1 ) );
radialGrad.addColorStop( 1, Color( 0.6, 0.6, 0.6 ) );
ctx.setSource( radialGrad );
ctx.paint();
for( vector<Flower>::const_iterator flIt = mFlowers.begin(); flIt != mFlowers.end(); ++flIt )
flIt->draw( ctx );
}
void WisteriaApp::setup()
{
// allocate our offscreen buffer
mOffscreenBuffer = cairo::SurfaceImage( WIDTH, HEIGHT, false );
mOffscreenContext = cairo::Context( mOffscreenBuffer );
// fill the buffer with gray
mOffscreenContext.setSourceRgb( 0.23f, 0.23f, 0.23f );
mOffscreenContext.paint();
// Let the Branches know how big our windows is
Branch::setWindowSize( WIDTH, HEIGHT );
// Create some starting blossoms
mBlossoms.push_back( Branch( Vec2f( WIDTH - 50, 50 ), 0.619444444f, 0 ) );
mBlossoms.push_back( Branch( Vec2f( 60, HEIGHT - 60 ), 0.905f, 180 ) );
mBlossoms.push_back( Branch( Vec2f( WIDTH / 2, HEIGHT / 2 ), 0.105555556f, 320 ) );
mIsIdle = false;
mIdleFrames = 0;
}