How to plot over a home blueprint?

Hello researchers,

I stumbled upon a visualization problem. Let say i want to plot the indoor navigation coordinates over my home blueprint. say i start from point (0,0) and moove forward 5 units to (5,0) at this point i turn 20deg on the left and move another 5 units so angle theta=20, hypotenuse = 5. So the second point coordinates would be (H*cos(th),H*sin(th).

My questions are, is it a simpler way to calculate coordinates when turn with an angle? How to plot this over my blueprint?

Thanks in advance.