Method of using a touch display screen to adjust and determine a reticle of electronic firearm sight

A method of using a touch display screen to adjust and determine a reticle of an electronic firearm sight, comprising:

• providing an object to fire at;
• setting an origin of a Cartesian coordinate system at a center of the touch display screen;
• displaying an image of the object on the touch display screen, superimposing the Cartesian coordinate system, saved in a memory, over the image of the object, and aligning the image of the object with the origin of the Cartesian coordinate system;
• firing a first bullet toward the object by a firearm to get a first bullet hole on the object and displaying an image of the first bullet hole through the touch display screen;
• finding a corresponding place of the first bullet hole appearing on the touch display screen;
• obtaining a coordinate value of the corresponding place of the first bullet hole appearing on the touch display screen;
• clicking on a place on the touch display screen of a coordinate value opposite the coordinate value of the first bullet hole;
• thereby moving the origin of the Cartesian coordinate system to the place of the opposite value;
• aiming at the object with the moved origin of the Cartesian coordinate system by moving a lens of the electronic firearm sight, so that the touch display screen and the firearm are synchronously moved, in such a manner that the image of the object is aligned with the moved origin of the Cartesian coordinate system, thereby positioning the place of the first bullet hole at the center of the touch display screen;
• firing a second bullet toward the object by the firearm to get a second bullet hole on the object and displaying an image of the second bullet hole through the touch display screen, wherein a corresponding place of the second bullet hole appears on the touch display screen as substantially the same place as the first bullet hole at the center of the touch display screen;
• removing the Cartesian coordinate system from the touch display screen;
• clicking on the corresponding place of the second bullet hole on the touch display screen, wherein a reticle appears at the corresponding place of the second bullet hole at the center of the touch display screen such that a ballistic trajectory of the firearm may thereafter be adjusted to align the image of the object with the reticle at the center of the touch display screen;
• and
• obtaining a coordinate value of the corresponding place of the second bullet hole appearing on the touch display screen and storing the coordinate value of the second bullet hole in the memory.