Method for controlling cursor

A computer program product embodied in a non-transitory device readable medium, wherein when the computer program product is loaded into and executed by a portable electronic device which comprises a display screen and a motion sensor, the portable electronic device practices a method for controlling a cursor, the display screen having a short side and a long side and displaying the cursor, wherein the portable electronic device is defined as having a first axis and a second axis, the first axis being parallel to the short side of the display screen, the second axis being parallel to the long side of the display screen, and the first axis and the second axis perpendicularly intersecting at a center point of the display screen, the computer program product comprising:

• a first program code for setting a maximum first-axis rotation angle of the portable electronic device around the first axis and a maximum second-axis rotation angle of the portable electronic device around the second axis;
• a second program code for detecting a first-axis rotation angle of the portable electronic device around the first axis and a second-axis rotation angle of the portable electronic device around the second axis by the motion sensor;
• a third program code for determining a second-axis coordinate of the cursor according to a first proportion of the first-axis rotation angle to the maximum first-axis rotation angle and a relationship between the first proportion and a length of the long side;
• a fourth program code for determining a first-axis coordinate of the cursor according to a second proportion of the second-axis rotation angle to the maximum second-axis rotation angle and a relationship between the second proportion and a length of the short side;
• and
• a fifth program code for moving the cursor on the displaying screen according to the first-axis coordinate and the second-axis coordinate of the cursor.