---
# System prepended metadata

title: Untitled

---

```.cpp

Canvas c1;
circle = c1.addCircle(blah);
c1.addRectangle(blah);
c1ircle.setColor(red);

Canvas c2;
circle = c2.addCircle(blah);
c2.addRectangle(blah);

SmartLeds.show(c1);
SmartLefs.show(c2);

blink(Circle& c) {
    if (millis() % 1000 < 500)
        c.setColor(red);
    else
        c.setColor(green);
}

c ...

f = c.render()

c....

e = c.render()

e!=f


frame f;

drawCircle(f);
drawRectangle(f);

frame e;

drawCircle(e);
drawCircle(e)


// 

```