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GestureUtils
class GestureUtils
Utility functions for gesture processing & analysis, including methods for:
- feature extraction (e.g., samplers and those for calculating bounding boxes and gesture path lengths);
- geometric transformation (e.g., translation, rotation and scaling);
- gesture similarity comparison (e.g., calculating Euclidean or Cosine distances between two gestures).
Summary
| Public methods |
| static OrientedBoundingBox! |
Computes an oriented, minimum bounding box of a set of points.
|
| static OrientedBoundingBox! |
Computes an oriented, minimum bounding box of a set of points.
|
| static FloatArray! |
Samples the gesture spatially by rendering the gesture into a 2D grayscale bitmap.
|
| static FloatArray! |
Samples the gesture spatially by rendering the gesture into a 2D grayscale bitmap.
|
| static FloatArray! |
Samples a stroke temporally into a given number of evenly-distributed points.
|
Public methods
computeOrientedBoundingBox
static fun computeOrientedBoundingBox(originalPoints: FloatArray!): OrientedBoundingBox!
Computes an oriented, minimum bounding box of a set of points.
spatialSampling
static fun spatialSampling(
gesture: Gesture!,
bitmapSize: Int
): FloatArray!
Samples the gesture spatially by rendering the gesture into a 2D grayscale bitmap. Scales the gesture to fit the size of the bitmap. The scaling does not necessarily keep the aspect ratio of the gesture.
| Parameters |
gesture |
Gesture!: the gesture to be sampled |
bitmapSize |
Int: the size of the bitmap |
| Return |
FloatArray! |
a bitmapSize x bitmapSize grayscale bitmap that is represented as a 1D array. The float at index i represents the grayscale value at pixel [i%bitmapSize, i/bitmapSize] |
spatialSampling
static fun spatialSampling(
gesture: Gesture!,
bitmapSize: Int,
keepAspectRatio: Boolean
): FloatArray!
Samples the gesture spatially by rendering the gesture into a 2D grayscale bitmap. Scales the gesture to fit the size of the bitmap.
| Parameters |
gesture |
Gesture!: the gesture to be sampled |
bitmapSize |
Int: the size of the bitmap |
keepAspectRatio |
Boolean: if the scaling should keep the gesture's aspect ratio |
| Return |
FloatArray! |
a bitmapSize x bitmapSize grayscale bitmap that is represented as a 1D array. The float at index i represents the grayscale value at pixel [i%bitmapSize, i/bitmapSize] |
temporalSampling
static fun temporalSampling(
stroke: GestureStroke!,
numPoints: Int
): FloatArray!
Samples a stroke temporally into a given number of evenly-distributed points.
| Parameters |
stroke |
GestureStroke!: the gesture stroke to be sampled |
numPoints |
Int: the number of points |
| Return |
FloatArray! |
the sampled points in the form of [x1, y1, x2, y2, ..., xn, yn] |
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Last updated 2025-02-10 UTC.
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