Split rectangle into two equal shapes at diagonal?
I'm not looking to copy the exact headers as shown below, but I want to try the basic idea of splitting a rectangle in half in a similar angle so I have two layers and can try different things to them, such as an image on one half and text on the other, keeping each piece equal.
How do I do this in Photoshop? I was playing with the direct selection tool, but grabbing random points just makes a mess.


