Rotating the View
Photoshop CS6 Tutorial
How to Rotate the View in Photoshop
You may find yourself painting or sketching in Photoshop. For better brush control, you may want to rotate the canvas temporarily. The document still retains it's original rotation, the view is just temporarily rotated.
Open a new 500 pixel by 500 pixel Photoshop document (File > New).
Select the Brush tool (b key) and set the Foreground color.
Paint a series of lines in the image.
To rotate the canvas, press and hold the r key, then drag the canvas to change the angle.
Once you release the r key, you are returned to the Brush tool so you can continue your painting.
To reset the canvas back to the original setting, press and hold the r key and click Reset View in the Tool options.