EP0367405A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Graphics system
Assignee: Individual
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Filing: 1989-10-02
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Granted: —
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Expires: 2009-10-02
Abstract
Abstract A graphics system comprises an input device, and a computer for detecting changes in the position of the input device relative to a surface, and a monitor (63) for displaying patterns which follow the movement of the input device. The computer calculates at least one differential derivative with respect to time of the input device position and controls characteristics of the display patterns in dependance upon the or each calculated derivative.
Inventors
- 👤 Stephen Brian Willan
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 12:52
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/048; G06F3/0487; G06F3/0488; G06F3/04883; G06F3/0484; G06F3/04845; G06T; G06T11/00; G06T11/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
74 words
A graphics system comprising an input device, means for detecting changes in the position of the input device relative to a surface, and means for displaying patterns which follow the movement of the input device, wherein means are provided for determining at least one differential derivative with respect to time of the input device position, and means are provided for controlling characteristics of the displayed patterns in dependence upon the or each determined derivative.
Claim 2
Dependent Claim
74 words
A graphics system comprising an input device, means for detecting changes in the position of the input device relative to a surface, and means for displaying patterns which follow the movement of the input device, wherein means are provided for determining at least one differential derivative with respect to time of the input device position, and means are provided for controlling characteristics of the displayed patterns in dependence upon the or each determined derivative.
Claim 3
Dependent Claim
52 words
A system according to claim 1, wherein the components defining the input device position comprise first and second components defining the displacement of the input device and a third component defining the pressure with which the device is applied to the surface or the displacement of the device away from the surface.
Claim 4
Dependent Claim
41 words
A system according to claim 1 or claim 2, wherein the means for determining at least one differential derivative with respect to time is adapted to calculate the derivative of one or more of the components defining the input device position.
Claim 5
Independent Claim
29 words
A system according to any of the preceding claims, wherein the determined derivatives control one or more of the shape, width, density, texture and colour of the displayed patterns.
Claim 6
Independent Claim
49 words
A system according to any of the preceding claims, wherein the acceleration of the input device relative to the surface is determined, the means for controlling characteristics of the display pattern determining whether the acceleration exceeds a threshold and, if it does, causing a splash effect to be displayed.
Claim 7
Dependent Claim
84 words
A graphics system comprising an input device, means for detecting changes in the position of the input device relative to a surface, means for displaying patterns which follow the movement of the input device, and storage means for storing data defining the form of a simulated surface on which the patterns are being drawn, wherein the means for displaying patterns is responsive to movement of the input device and the stored data to simulate the effect of underlying surface on the pattern being drawn.
Claim 8
Dependent Claim
84 words
A graphics system comprising an input device, means for detecting changes in the position of the input device relative to a surface, means for displaying patterns which follow the movement of the input device, and storage means for storing data defining the form of a simulated surface on which the patterns are being drawn, wherein the means for displaying patterns is responsive to movement of the input device and the stored data to simulate the effect of underlying surface on the pattern being drawn.
Claim 9
Dependent Claim
21 words
A system according to claim 6, wherein the stored data simulates the thickness of a simulated colour medium laid down previously.
Claim 10
Dependent Claim
16 words
A system according to any of claims 1 to 6 and claim 7 or claim 8.
References Cited (Backward Citations)
No citation records indexed.
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