Drawing Backup Cam HUD Dynamically in Android

Question

So I'm implementing an RTSP backup cam in an Android application. The catch is this: various vehicles have cams w/ different FOV - so I can't just throw a PNG up. It needs to be easily adjustable.

Currently my setup is to use paths:

redPath.moveTo(xLeft, yLeft);   //set starting point
redPath.lineTo(xLeft = (float)(xLeft + length * Math.sin(angleRads)),yLeft = (float)(yLeft - length * Math.cos(angleRads))); //move up (based on angle)
        canvas.drawLine(xLeft + 5, yLeft + 3, xLeft - length + 5, yLeft + 3, paint);
redPath.moveTo(xLeft = (float)(xLeft + gap * Math.sin(angleRads)),yLeft = (float)(yLeft - gap * Math.cos(angleRads))); //add 10px gap
redPath.lineTo(xLeft = (float)(xLeft + length * Math.sin(angleRads)),yLeft = (float)(yLeft - length * Math.cos(angleRads))); //draw next segment

which looks something like this - (small tweaking issues like the pixels overhanging notwithstanding):

But,I'd like to achieve more of a perspective drawing look - something like this (note that the lines are parallelograms):

in an ideal world, it could be modified by changing startXLeft, startXRight, startY and angle, and maintain look.