Data Structures |
class | GeisGroup |
| A collection of gesture frames. More...
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class | GeisGroupSet |
| A collection of GeisGroups. More...
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class | GeisTouch |
| An instance of a touch. More...
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class | GeisTouchId |
| Relates a touch in a frame to a touch object in a set. More...
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class | GeisTouchSet |
| A collection of GeisTouch. More...
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class | GeisFrame |
| A collection of information describing the state of a gesture. More...
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Functions |
GeisStatus | geis_gesture_accept (Geis geis, GeisGroup group, GeisGestureId gesture_id) |
| Marks a gesture as accepted.
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GeisStatus | geis_gesture_reject (Geis geis, GeisGroup group, GeisGestureId gesture_id) |
| Marks a gesture as rejected.
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GeisSize | geis_groupset_group_count (GeisGroupSet groupset) |
| Gets the number of gesture groups in a groupset.
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GeisGroup | geis_groupset_group (GeisGroupSet groupset, GeisSize index) |
| Gets an indicated gesture group from a groupset.
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GeisInteger | geis_group_id (GeisGroup group) |
| Gets the identifier of a gesture group.
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GeisSize | geis_group_frame_count (GeisGroup group) |
| Gets the number of gesture frames in a gesture group.
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GeisFrame | geis_group_frame (GeisGroup group, GeisSize index) |
| Gets an indicated gesture frame from a gesture group.
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void | geis_group_reject (GeisGroup group) |
| Marks a gesture group as rejected.
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GeisSize | geis_touchset_touch_count (GeisTouchSet touchset) |
| Gets the number of touches in a touchset.
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GeisTouch | geis_touchset_touch (GeisTouchSet touchset, GeisSize index) |
| Gets an indicated touch from a touchset.
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GeisTouch | geis_touchset_touch_by_id (GeisTouchSet touchset, GeisTouchId touchid) |
| Gets an identified touch from a touchset.
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GeisTouchId | geis_touch_id (GeisTouch touch) |
| Gets the identifier of a touch.
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GeisSize | geis_touch_attr_count (GeisTouch touch) |
| Gets the number of attrs associated with a touch.
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GeisAttr | geis_touch_attr (GeisTouch touch, GeisSize index) |
| Gets an indicated attr from a touch.
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GeisAttr | geis_touch_attr_by_name (GeisTouch touch, GeisString name) |
| Gets a named attr from a touch.
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GeisGestureId | geis_frame_id (GeisFrame frame) |
| Gets the identifier of a gesture frame.
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GeisBoolean | geis_frame_is_class (GeisFrame frame, GeisGestureClass gesture_class) |
| Indicates if a gesture frame belongs to a gesture class.
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GeisSize | geis_frame_attr_count (GeisFrame frame) |
| Gets the number of attrs associated with a gesture frame.
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GeisAttr | geis_frame_attr (GeisFrame frame, GeisSize index) |
| Gets an indicated attr from a gesture frame.
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GeisAttr | geis_frame_attr_by_name (GeisFrame frame, GeisString name) |
| Gets a named attr from a gesture frame.
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GeisFloat * | geis_frame_matrix (GeisFrame frame) |
| Gets the current transform matrix of a gesture.
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GeisSize | geis_frame_touchid_count (GeisFrame frame) |
| Gets the number of touches making up a gesture for the frame.
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GeisTouchId | geis_frame_touchid (GeisFrame frame, GeisSize index) |
| Gets the ID of the indicated touch within the gesture frame.
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Gesture Frame Event Attributes |
- A gesture event (GEIS_EVENT_GESTURE_BEGIN, GEIS_EVENT_GESTURE_UPDATE, GEIS_EVENT_GESTURE_END) should have two GEIS_ATTR_TYPE_POINTER attributes, one containing a GeisGroupSet and one containing a GeisTouchSet.
For example: If four fingers are being simultaneously moved over a touchpad or touchscreen surface, Geis could start generating gesture events containing two groups: One group having a single frame from a four-fingers gesture of some class and a second group having two frames, each from a different two-fingers gesture (like one from a Rotate and the other from a Pinch gesture). This means that geis could interpret the movements of those four touch points as both a single four-fingers gesture and as two separate two-fingers gestures.
There can be only a single frame per gesture in a gesture event. I.e. no two frames will return the same GeisGestureId in the same gesture event.
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#define | GEIS_EVENT_ATTRIBUTE_GROUPSET |
| The event attribute containing a pointer to a GeisGroupSet.
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#define | GEIS_EVENT_ATTRIBUTE_TOUCHSET |
| The event attribute containing a pointer to a GeisTouchSet.
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Touch Attributes |
- Each touch has zero or more attributes associated with it. Differing hardware is capable of reporting differing sets of touch attributes, so there is no guarantee that any or all of the defined touch attributes will bre present.
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#define | GEIS_TOUCH_ATTRIBUTE_ID |
| Identifies the touch.
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#define | GEIS_TOUCH_ATTRIBUTE_X |
| The X coordinate of the touch.
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#define | GEIS_TOUCH_ATTRIBUTE_Y |
| The Y coordinate of the touch.
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Gesture state information.
Gesture frames, and their associated groups and touches, convey information about the current state of recognized gestures.