Method draw

src/app/Scene.cpp:25–33

	math::Vec size;

	void draw(const DrawArgs& args) override {
		nvgBeginPath(args.vg);
		nvgMoveTo(args.vg, box.size.x, box.size.y);
		nvgLineTo(args.vg, 0, box.size.y);
		nvgLineTo(args.vg, box.size.x, 0);
		nvgClosePath(args.vg);
		nvgFillColor(args.vg, nvgRGBAf(1, 1, 1, 0.15));
		nvgFill(args.vg);
	}

	void onDragStart(const DragStartEvent& e) override {
		size = APP->window->getSize();