Method draw

test/SphereProjection/src/SphereProjectionApp.cpp:90–152

}

void SphereProjectionApp::draw()
{
	gl::enableDepthRead();
	gl::enableDepthWrite();
	gl::enableAlphaBlending();
	
	gl::setMatrices( mCam );
	gl::clear( Color( 0, 0, 0 ) );

	gl::color( 1, 1, 1 );
	mPlaneBatch->draw();
	
	gl::color( 1, 0, 0 );
	gl::drawSphere( mSpherePositions[0], mSphereRadii[0], 40 );
	gl::color( 0, 1, 0 );
	gl::drawSphere( mSpherePositions[1], mSphereRadii[1], 40 );
	gl::color( 0, 0, 1 );
	gl::drawSphere( mSpherePositions[2], mSphereRadii[2], 40 );
	
	gl::setMatricesWindow( getWindowSize() );

	for( int i = 0; i < 3; ++i ) {
		vec3 cameraSpaceSpherePos( mCam.getViewMatrix() * vec4( mSpherePositions[i], 1 ) );
		vec2 center, axisA, axisB;
		Sphere worldSpaceSphere( mSpherePositions[i], mSphereRadii[i] );
		Sphere cameraSpaceSphere( cameraSpaceSpherePos, mSphereRadii[i] );
		cameraSpaceSphere.calcProjection( mCam.getFocalLength(), &center, &axisA, &axisB );

		// draw ellipse projection
		gl::color( 1, 1, 0 );
		gl::disableDepthRead();
		gl::drawSolidCircle( clipToScreenCoords( center ), 4.0f );
		gl::drawLine( clipToScreenCoords( center - axisA ), clipToScreenCoords( center + axisA ) );
		gl::drawLine( clipToScreenCoords( center - axisB ), clipToScreenCoords( center + axisB ) );
		gl::color( 1, 1, 1, 1 );
		
		// draw bounding circle
		mCam.calcScreenProjection( worldSpaceSphere, getWindowSize(), &center, &axisA, &axisB );
		gl::drawStrokedCircle( center, std::max( length( axisA ), length( axisB ) ) );
	}
	
	ImGui::ScopedWindow window( "Sphere Projection Controls" );
	float fov = mFov;
	if( ImGui::SliderFloat( "Field of View", &fov, 1.0f, 120.0f, "%.1f deg" ) )
		mFov = fov;

	bool paused = mTimer.isStopped();
	if( ImGui::Checkbox( "Pause Animation", &paused ) ) {
		if( paused )
			mTimer.stop();
		else
			mTimer.resume();
	}

	if( ImGui::Button( "Frame Sphere 1" ) )
		mCam = mCam.calcFraming( Sphere( mSpherePositions[0], mSphereRadii[0] ) );
	ImGui::SameLine();
	if( ImGui::Button( "Sphere 2" ) )