Cameras

Extends: WEBCAM > CONTROL > WIDGET

A Webcam control controls a built-in or attached camera. It adds a few properties to the CONTROL properties.

CAMERA

Part of: WEBCAM

Controls which camera is active.

Syntax

GPROP name "CAMERA
PPROP name "CAMERA what

Description

CAMERA selects the camera whose feed Logo should display. Its input is either a number between 1 and the number of cameras attached to the computer, or the case-insensitive start of a camera name as returned by the CAMERAS property.

CAMERA also accepts a two-element list, where the first element is the camera name or number, and the second element is the desired width of the camera resolution in pixels. Many cameras support different resolutions, and Logo tries to match the supplied value as closely to the next available resolution as possible.

If there is no camera attached, the return value is -1.

Examples

DRAW ; Drop a WEBCAM widget from the Toolbox > Controls WEBCAM dropped GPROP “WEBCAM “CAMERA Result: Built-in camera

CAMERAS

Part of: WEBCAM

Outputs a list of camera names.

Syntax

GPROP name "CAMERAS

Description

CAMERAS outputs a list of cameras attached to the computer. You can use the name of a camera to select it with the CAMERA property.

Examples

DRAW ; Drop a WEBCAM widget from the Toolbox > Controls WEBCAM dropped GPROP “WEBCAM “CAMERAS Result: [Built-in camera]

RESOLUTION

Part of: WEBCAM

Outputs a two-element list of the current camera resolution.

Syntax

GPROP name "RESOLUTION

Description

RESOLUTION outputs a two-element list describing the resolution of the currently selected camera. The first element is the width and the second element is the height, both measured in pixels.

If no camera is attached, both values are 0.

Examples

DRAW ; Drop a WEBCAM widget from the Toolbox > Controls WEBCAM dropped GPROP “WEBCAM “RESOLUTION Result: [1080 768]

TITLE

Part of: WEBCAM

Outputs the name of the currently attached camera.

Syntax

GPROP name "TITLE

Description

The TITLE property outputs the name of the currently attached camera if there is one. If no camera is attached, it outputs the empty word.

Examples

DRAW ; Drop a WEBCAM widget from the Toolbox > Controls WEBCAM dropped GPROP “WEBCAM “TITLE Result: Built-in camera