Method of controlling projector and projector

A projector comprising:

• one or more processors programmed to:
• detect an installation angle of the projector with respect to a reference direction set in advance;
• determine a correction amount of correcting a shape of an image to be projected by the projector based on the installation angle detected;
• correct the shape of the image based on the correction amount determined;
• and
• project the image, wherein the one or more processors determine the correction amount by:
• dividing a range of the installation angle at which the projector is installed into a plurality of areas;
• setting a reference angle for each of four areas divided for projection including a first area that is greater than 315 degrees and less than or equal to 45 degrees, a second area greater than 45 degrees and less than or equal to 135 degrees, a third area greater than 135 degrees and less than or equal to 225 degrees, and a fourth area greater than 225 degrees and less than or equal to 315 degrees;
• determining which area of the first, second, third, and fourth areas the installation angle belongs to and identifying the reference angle associated with the determined area, and
• determining the correction amount based on a difference between the reference angle set in advance in the area to which the installation angle is determined to belong and the installation angle detected.