Method and apparatus for in-place line width selection for graphics applications

• US 5,877,750 A
• Filed: 09/17/1996
• Issued: 03/02/1999
• Est. Priority Date: 09/17/1996
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Hanson, Gary Robert
• Primary Examiner(s): Hofsass, Jeffery A.
• Assistant Examiner(s): MANNAVA, ASHOK K
• Application Number:
  US08/713,681
• Time in Patent Office: 896 Days
• Field of Search: 345/173, 345/157, 345/179, 345/180, 345/181, 345/443, 178/18-20, 178/18.01, 178/18.03, 178/19.01, 364/709.01, 364/709.11, 349/12
• US Class Current: 345/173
• CPC Class Codes: G06F 3/04845 for image manipulation, e.g. dragging, rotation, expansion or change of colour

Abstract

In-place line width selection for use in a computer based graphics application employing a drawing tool includes the steps of (i) activating a line width selection mode upon an occurrence of a first event designating an initial point of contact in a drawing area by the drawing tool; (ii) growing an "ink-spill" to a desired line width dimension at the initial point of contact in the drawing area; and (iii) entering a graphic line drawing mode with the drawing tool for drawing a graphic line having the desired line width dimension selected according to the "ink-spill" grown in the previous step.

Claims

1. An in-place line width selection method for use in a computer based graphics application employing a drawing tool, said method comprising the steps of:

activating a line width selection mode upon an occurrence of a "pen-down" event designating an initial point of contact in a drawing area by the drawing tool;

starting a timer upon the occurrence of said "pen-down" event;

upon expiration of the timer, growing an "ink-spill" to a desired line width dimension at the initial point of contact in the drawing area until an occurrence of either a "pen-up" event or a "pen-move" event; and

,

entering a graphic line drawing mode with the drawing tool for drawing a graphic line having the desired line width dimension selected according to the "ink-spill" grown in the previous step.

2. The line width selection method of claim 1, further comprising the step of:

stopping the timer and aborting the activation step upon an occurrence of either a "pen-up" event or a "pen-move" event prior to said "ink-still" growing step.

3. The line width selection method of claim 1, further comprising, subsequent to said "ink-spill" growing step, the step of erasing the "ink-spill" upon the occurrence of said "pen-up" event during said "ink-spill" growing step.

4. The line width selection method of claim 1, further wherein said step of entering the graphic line drawing mode includes entering the drawing mode upon the occurrence of said "pen-move" event during said "ink-spill" growing step.

5. The line width selection method of claim 1, wherein said "ink-spill" growing step further includes the step of changing a direction of growth of the "ink-spill" upon an occurrence of a fourth event during said "ink-spill" growing step, the fourth event corresponding to a "single-tap" event.

6. The line width selection method of claim 5, wherein the occurrence of the fourth event during said "ink-spill" growing step results in a change in the direction of growth from incremental to decremental.

7. The line width selection method of claim 5, wherein the occurrence of the fourth event during said "ink-spill" growing step results in a change in the direction of growth from decremental to incremental.

8. An apparatus for implementing in-place line width selection for use in a computer based graphics application employing a drawing tool, said apparatus comprising:

means for activating a line width selection mode upon an occurrence of a "pen-down" event designating an initial point of contact in a drawing area by the drawing tool;

means for starting a timer upon the occurrence of said "pen-down" event;

means operable upon expiration of the timer, and until an occurrence of either a "pen-up" event or a "pen-move" event, for growing an "ink-spill" to a desired line width dimension at the initial point of contact in the drawing area; and

,

means for entering a graphic line drawing mode with the drawing tool for drawing a graphic line having the desired line width dimension selected according to the "ink-spill" grown.

9. The apparatus of claim 8, further comprising:

means for stopping the timer and aborting said activation means upon an occurrence of either a "pen-up" event or a "pen-move" event prior to operation of said "ink-spill" growing means.

10. The apparatus of claim 8, further comprising means for erasing the "ink-spill" upon the occurrence of said "pen-up" event during a growing of the "ink-spill" by said "ink-spill" growing means.

11. The apparatus of claim 8, further wherein said means for entering the graphic line drawing mode includes means for entering the drawing mode upon the occurrence of said "pen-up" event during a growing of the "ink-spill" by said "ink-spill" growing means.

12. The apparatus of claim 8, wherein said "ink-spill" growing means further includes means for changing a direction of growth of the "ink-spill" upon an occurrence of a fourth event during a growing of the "ink-spill" by said "ink-spill" growing means, the fourth event corresponding to a "single-tap" event.

13. The apparatus of claim 12, wherein the occurrence of the fourth event during the growing of the "ink-spill" by said "ink-spill" growing means results in a change in the direction of growth from incremental to decremental.

14. The apparatus of claim 12, wherein the occurrence of the fourth event during the growing of the "ink-spill" by said "ink-spill" growing means results in a change in the direction of growth from decremental to incremental.

15. A computer based graphics application drawing apparatus comprising:

a drawing cursor input device;

a display device having a drawing display area; and

a processor for processing an input received from said drawing cursor input device, said processor processing the input and providing an output to said display device for said display device to display the output in the drawing area, said processor further for implementing an in-place line width selection, wherein the in-place line width selection includes (i) activating a line width selection mode upon an occurrence of a first event carried out by said drawing cursor input device for designating an initial point of contact in the drawing area and starting a timer upon the occurrence of the first event, the first event corresponding to a "pen-down" event, (ii) upon expiration of the activation timer, growing an "ink-spill" to a desired line width dimension at the initial point of contact in the drawing area, until an occurrence of either a "pen-up" event or a "pen-move" event and (iii) entering a graphic line drawing mode with said drawing cursor input device for drawing a graphic line having the desired line width dimension selected according to the "ink-spill" grown.

16. The apparatus of claim 15, wherein activating the in-place line width selection by said processor further includes erasing the "ink-spill" upon the occurrence of said "pen-up" event during a growing of the "ink-spill".

17. The apparatus of claim 15, wherein activating the in-place line width selection by said processor further includes entering the graphic line drawing mode upon the occurrence of said "pen-move" event during a growing of the "ink-spill".