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SAA_bezierCurveGetHandles
SAA_bezierCurveSetHandles
Sets and retrieves the positions of the handles for a bezier curve.
SAA_bezierCurveGetHandles sceneID modelID geomtype shapeid nbCtrlVertices
handles
SAA_bezierCurveSetHandles scene model geomtype shapeid nbCtrlVertices
handles
model
A spline of type SAA_SPL_BEZIER. You should verify that model
is a bezier spline before calling these functions. Use SAA_AllocElem to allocate it.
geomtype
Specifies what geometry you want to work with:
SAA_GEOM_ORIGINAL for the original, non-deformed geometry.SAA_GEOM_DEFORMED for deformed geometry (if any deformations, such as
lattice, curve, surface, wave, qstretch, flexible envelope, or other custom effects, are
applied to the model). To check if a model is deformed, use SAA_modelIsDeformed.SAA_GEOM_SHAPE to access shapes (the shapeid argument
specifies which shape).
For example if geometry is original call procedure with parameter $SAA_Constants(SAA_GEOM_ORIGINAL).
SAA_Constants is a global array.
shapeid
Identifies the shape if the geometry type is SAA_GEOM_SHAPE. To get the
shape identifiers, use SAA_modelGetNbShapes.
nbCtrlVertices
Number of control vertices in the curve.
handles
Array of handles in local coordinates. Use SAA_AllocDVector to allocate it.
The size of the array is (nbCtrlVertices * 2). There are always two bezier
handles for each control vertex. handles[2*i] and handles[2*i+1]
correspond to vertices[i].
The following functions reset the handles back to the positions of their corresponding
control vertices:
Example
proc SAA_bezierCurveGetHandlesExample {} {
global SAA_Constants
set sceneID [SAA_AllocScene]
SAA_sceneGetCurrent $sceneID
package require SW
set bezID [SW_name2Element spline1 $sceneID ]
SAA_splineGetClosed $sceneID $bezID closed
SAA_modelGetNbVertices $sceneID $bezID nbVert
set verticesID [SAA_AllocDVector $nbVert]
set handlesID [SAA_AllocDVector [expr $nbVert * 2]]
SAA_modelGetVertices $sceneID $bezID $SAA_Constants(SAA_GEOM_ORIGINAL)
0 \
$nbVert $verticesID
SAA_bezierCurveGetHandles $sceneID $bezID
$SAA_Constants(SAA_GEOM_ORIGINAL) \
0 $nbVert $handlesID
foreach item "$sceneID $bezID $verticesID $handlesID" {
SAA_Free $item
}
}
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SAA_bezierCurveGetHandles