void GeometryApp::createGrid()
{
mGrid = gl::VertBatch::create( GL_LINES );
mGrid->begin( GL_LINES );
for( int i = -10; i <= 10; ++i ) {
mGrid->color( Color( 0.25f, 0.25f, 0.25f ) );
mGrid->color( Color( 0.25f, 0.25f, 0.25f ) );
mGrid->color( Color( 0.25f, 0.25f, 0.25f ) );
mGrid->color( Color( 0.25f, 0.25f, 0.25f ) );
mGrid->vertex( float( i ), 0.0f, -10.0f );
mGrid->vertex( float( i ), 0.0f, +10.0f );
mGrid->vertex( -10.0f, 0.0f, float( i ) );
mGrid->vertex( +10.0f, 0.0f, float( i ) );
}
mGrid->end();
}
void ImmediateModeApp::draw()
{
gl::clear();
gl::VertBatch vb( GL_TRIANGLES );
vb.color( 1, 0, 0 );
vb.vertex( getWindowWidth() / 2, 50 );
vb.color( 0, 1, 0 );
vb.vertex( getWindowWidth() - 50, getWindowHeight() - 50 );
vb.color( 0, 0, 1 );
vb.vertex( 50, getWindowHeight() - 50 );
vb.draw();
// draw
mBatch->begin( GL_LINE_STRIP );
for( const vec2 &point : mPoints ) {
mBatch->vertex( vec4( point, 0, 1 ), Color( 1.0f, 0.5f, 0.25f ) );
}
mBatch->draw();
}