METHOD AND APPARATUS FOR CONTROLLING DOT RENDERING ON A TOUCH SCREEN

• US 20130229360A1
• Filed: 03/05/2012
• Published: 09/05/2013
• Est. Priority Date: 03/05/2012
• Status: Active Grant

• Current Assignee: Adobe Inc.
• Original Assignee: Adobe Systems Incorporated (Adobe Inc.)
• Inventors: Liang, Mao, Zhang, Mingjun
• Granted Patent: US 9,459,790 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/04883 for inputting data by handwriting, e.g. gesture or text

Abstract

A method and apparatus for controlling dot rendering for a touch screen. The method and apparatus receives indicia of pressure on the touch screen, where the pressure indicia represents an amount of force applied to the touch screen. From the indicia, the method and apparatus computes a dot size and renders a dot having the computed dot size on the touch screen.

Claims

1. A method for controlling dot rendering for a touch screen, the method comprising:

receiving indicia of pressure on a touch screen, where the pressure indicia represents an amount of force applied to the touch screen;

computing a dot size based on the pressure indicia;

rendering a dot having the computed dot size on the touch screen.

2. The method of claim 1, wherein receiving indicia of pressure on the touch screen comprises touching the touch screen, generating a touch event in response to touching the touch screen, and reading the touch event to access the indicia of pressure therefrom.

3. The method of claim 1 wherein the force is applied to the touch screen by at least one finger or a stylus.

4. The method of claim 1, wherein computing the dot size uses a minimum and a maximum dot size, and a minimum and a maximum pressure value, a current dot size, and a current pressure.

5. The method of claim 4, wherein the current dot size is computed as a summation of the minimum dot size and a change in the dot size corresponding to a change in pressure calculated as a difference in the current pressure and the minimum pressure.

6. The method of claim 5, further comprising dynamically controlling changes in the dot size based on changes in the pressure indicia.

7. The method of claim 1 further comprising repeatedly computing the dot size and rendering the dot as a contact location on the touch screen changes, where a plurality of rendered dots form a stroke having a variable width.

8. An apparatus for controlling dot rendering for a touch screen, the apparatus comprising:

an operating system for generating a touch event in response to a force being applied to a touch screen;

a rendering controller for receiving indicia of pressure from the touch event and computing a dot size based on the indicia; and

a display controller for rendering a dot having the computed dot size.

9. The apparatus of claim 8, wherein the touch screen is pressure sensitive and the pressure indicia represents an amount of force applied to the touch screen.

10. The apparatus of claim 8, wherein the operating system repeatedly generates a plurality of touch events in response to a contact location of the force moving across the touch screen.

11. The apparatus of claim 8, wherein the rendering controller is at least one of a component of, a plug in and an extension for, the operating system.

12. The apparatus of claim 8, wherein the rendering controller is launched in response to generation of the touch event by the operating system.

13. The apparatus of claim 8, wherein computing the dot size uses a minimum and a maximum dot size, and a minimum and a maximum pressure value, a current dot size, and a current pressure.

14. The apparatus of claim 13, wherein the current dot size is computed as a summation of the minimum dot size and a change in the dot size corresponding to a change in pressure calculated as a difference in the current pressure and the minimum pressure.

15. The apparatus of claim 14, wherein the rendering controller dynamically controls changes in the dot size based on changes in the pressure indicia.

16. The apparatus of claim 8 wherein the rendering controller repeatedly computes the dot size and renders the dot as a contact location on the touch screen changes, where a plurality of rendered dots form a stroke having a variable width.

17. A computer readable medium for storing executable code that, when executed by a processor, causes the processor to perform a method for controlling dot rendering for a touch screen, the method comprising:

receiving indicia of pressure on a touch screen, where the pressure indicia represents an amount of force applied to the touch screen;

computing a dot size based on the pressure indicia;

rendering a dot having the computed dot size on the touch screen.

18. The computer readable medium of claim 17, wherein receiving indicia of pressure on the touch screen comprises touching the touch screen, generating a touch event in response to touching the touch screen, and reading the touch event to access the indicia of pressure therefrom.

19. The computer readable medium of claim 17 wherein the force is applied to the touch screen by at least one finger or a stylus.

20. The computer readable medium of claim 17, further comprising dynamically controlling changes in the dot size based on changes in the pressure indicia.