TOUCH CONTROL METHOD

• US 20110012927A1
• Filed: 04/01/2010
• Published: 01/20/2011
• Est. Priority Date: 07/14/2009
• Status: Abandoned Application

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: LIN, WEI-TE, LEE, TE-HUA
• Application Number:
  US12/752,163
• Publication Number:
  US 20110012927A1
• Time in Patent Office: Days
• US Class Current: 345/650
• CPC Class Codes: G06F 3/0488 using a touch-screen or digitiser, e.g. input of commands through traced gestures

Abstract

A touch control method for operating a touch screen includes: obtaining a to-be-operated object according to user'"'"'s operations; detecting coordinates A(X_A, Y_A) of a first touch point with respect to the to-be-operated object on the touch screen; detecting coordinates B(X_B, Y_B) of an initial point of a second touch point; obtaining an operating center C(X_C, Y_C) according to the coordinates A(X_A, Y_A) and B(X_B, Y_B); detecting coordinates B′(X_B′, Y_B′) of the second touch point after the second touch point is moved; computing lengths of the two vectors CB and CB′ according to the coordinates C(X_c, Y_C), B(X_B, Y_B), and B′(X_B′, Y_B′), and computing a zoom coefficient K according to the lengths of the two vectors CB and CB′; and zooming in or out the to-be-operated object according to the zoom coefficient K around the operating center C(X_C, Y_C).

Claims

1. A touch control method for operating a touch screen, the touch control method comprising:

obtaining a to-be-operated object according to user'"'"'s operations;

detecting coordinates A(X_A, Y_A) of a first touch point with respect to the to-be-operated object on the touch screen;

detecting coordinates B(X_B, Y_B) of an initial point of a second touch point;

obtaining an operating center C(X_C, Y_C) according to the coordinates A(X_A, Y_A) and B(X_B, Y_B);

detecting coordinates B′

(X_B′

, Y_B′

) of the second touch point after the second touch point is moved;

computing lengths of the two vectors CB and CB′

according to the coordinates C(X_C, Y_C), B(X_B, Y_B), and B′

(X_B′

, Y_B′

), and computing a zoom coefficient K according to the lengths of the two vectors CB and CB′

; and

zooming in or out the to-be-operated object according to the zoom coefficient K around the operating center C(X_C, Y_C).

2. The touch control method according to claim 1, wherein the zoom coefficient K is computed by following equation:

3. The touch control method according to claim 1, further comprising:

computing a distance D1 between the first touch point and the initial point of the second touch point according to the coordinates A(X_A, Y_A) and B(X_B, Y_B);

determining whether the distance D1 is greater than or equal to a predetermined distance R; and

if the distance D1 is greater than or equal to the predetermined distance R, the step that obtaining the operating center C(X_C, Y_C) according to the coordinates A(X_A, Y_A) and B(X_B, Y_B) is further implemented.

4. The touch control method according to claim 3, further comprising:

if the distance D1 is less than the predetermined distance R, generating prompt information to remind the user that the initial point of the second touch point is invalid, and allowing the user to input the initial point of the second touch point again, and the step that detecting coordinates B(X_B, Y_B) of the initial point of the second touch point is further implemented.

5. The touch control method according to claim 1, further comprising:

determining whether the second touch point is released; and

if the second touch point is not released, making the coordinates B(X_B, Y_B) equal to coordinates B′

(X_B′

, Y_B′

), and the step that detecting the coordinates B′

(X_B′

, Y_B′

) of the second touch point after the second touch point is moved is further implemented.

6. The touch control method according to claim 5, further comprising:

indicating the first touch point by an image when coordinates A(X_A, Y_A) of the first touch point are detected; and

clearing the image indicated the first touch point if the second touch point is released.

7. The touch control method according to claim 5, further comprising:

indicating a movement path of the second touch point by an image; and

clearing the image indicating the second touch point when the second touch point is released.

8. The touch control method according to claim 1, wherein the operating center C(X_C, Y_C) is a middle point of a line segment between the first touch point and the initial point of the second touch point, where X_C=(X_A+X_B)/2, Y_C=(Y_A+Y_B)/2.

9. The touch control method according to claim 1, further comprising:

computing an angle α

between two vectors CB and CB′

according to the coordinates C(X_C, Y_C), B(X_B, Y_B);

determining whether the angle α

is greater than or equal to a predetermined value; and

if the angle α

is less than the predetermined value, the step that computing the lengths of the two vectors CB and CB′

according to the coordinates C(X_C, Y_C), B(X_B, Y_B), and B′

(X_B′

, Y_B′

), and computing the zoom coefficient K according to the lengths of the two vectors CB and CB′

is implemented.

10. The touch control method according to claim 9, further comprising:

if the angle α

is greater than or equal to the predetermined value, computing a rotation direction from the vector CB to the vector CB′

according to the coordinates B(X_B, Y_B) and B′

(X_B′

, Y_B′

); and

rotating the to-be-operated object by the angle α

in the rotation direction around the operating center.

11. A touch control method for operating a touch screen, the touch control method comprising:

obtaining a to-be-operated object according to user'"'"'s operations;

detecting coordinates A(X_A, Y_A) of a first touch point;

detecting coordinates B(X_B, Y_B) of an initial point of a second touch point;

obtaining an operating center C(X_C, Y_C) according to coordinates A(X_A, Y_A);

detecting coordinates B′

(X_B′

, Y_B′

) of the second touch point after the second touch point is moved;

computing lengths of the two vectors CB and CB′

according to the coordinates C(X_C, Y_C), B(X_B, Y_B), and B′

(X_B′

, Y_B′

), and computing a zoom coefficient K according to the lengths of the two vectors CB and CB′

; and

zooming in or out the to-be-operated object according to the zoom coefficient K around the operating center C(X_C, Y_C).

12. The touch control method according to claim 11, wherein the zoom coefficient K is computed by following equation:

13. The touch control method according to claim 11, further comprising:

computing a distance D1 between the first touch point and the initial point of the second touch point according to the coordinates A(X_A, Y_A) and B(X_B, Y_B);

determining whether the distance D1 is greater than or equal to a predetermined distance R; and

if the distance D1 is greater than or equal to the predetermined distance R, the step that obtaining the operating center C(X_C, Y_C) according to the coordinates A(X_A, Y_A) is further implemented.

14. The touch control method according to claim 13, further comprising:

if the distance D1 is less than the predetermined distance R, generating prompt information to remind the user that the initial point of the second touch point is invalid, and allowing the user to input the initial point of the second touch point again, and the step that detecting the coordinates B(X_B, Y_B) of the initial point of the second touch point is further implemented.

15. The touch control method according to claim 11, further comprising:

determining whether the second touch point is released; and

if the second touch point is not released, making the coordinates B(X_B, Y_B) equal to coordinates B′

(X_B′

, Y_B′

), and the step that detecting coordinates B′

(X_B′

, Y_B′

) of the second touch point after the second touch point is moved is further implemented.

16. The touch control method according to claim 15, further comprising:

indicating the first touch point by an image when coordinates A(X_A, Y_A) of the first touch point are detected; and

clearing the image indicated the first touch point if the second touch point is released.

17. The touch control method according to claim 15, further comprising:

indicating a movement path of the second touch point by an image; and

clearing the image indicating the second touch point when the second touch point is released.

18. The touch control method according to claim 11, wherein the operating center C(X_C, Y_C) is the first touch point, where X_C=(X_A+X_B)/2, Y_C=(Y_A+Y_B)/2.

19. The touch control method according to claim 11, further comprising:

computing an angle α

between two vectors CB and CB′

according to the coordinates C(X_C, Y_C), B(X_B, Y_B);

determining whether the angle α

is greater than or equal to a predetermined value; and

if the angle α

is less than the predetermined value, step that computing the lengths of the two vectors CB and CB′

according to the coordinates C(X_C, Y_C), B(X_B, Y_B), and B′

(X_B′

, Y_B′

), and computing the zoom coefficient K according to the lengths of the two vectors CB and CB′

is implemented.

20. The touch control method according to claim 19, further comprising:

if the angle α

is greater than or equal to the predetermined value, computing a rotation direction from the vector CB to the vector CB′

according to the coordinates B(X_B, Y_B) and B′

(X_B′

, Y_B′

); and

rotating the to-be-operated object by the angle α

in the rotation direction around the operating center.