swplot.patchfacefcn#

Syntax#

patchfacefcn(hPatch, hit, callbackFun, selection)

patchfacefcn(hPatch, hit, callbackFun, selection, dLim)

Description#

patchfacefcn(hPatch, hit, callbackFun, selection) finds the index of the face in a patch object which was clicked on by the mouse. The function should be used as a callback function for the ButtonDownFcn event of the patch object and it will call a user defined function with the same arguments as the ButtonDownFcn call, plus adding an extra argument, the face index. Thus the user defined callback function needs to have the following header:

callbackFun(hPatch,hit,faceIndex)

The function can detect if the mouse click was on a face or on an edge of the patch object.

patchfacefcn(hPatch, hit, callbackFun, selection, dLim) adds optional control on the selectivity whether the click was on a face of a patch object.

Examples#

The color of any face of the red triangulated icosahedron will be changed from red to green if clicked on with the mouse.

mesh = swplot.icomesh(1)
V = mesh.X
F = mesh.Triangulation
hPatch = patch('Faces',F,'Vertices',V,'FaceColor','r','EdgeColor','none')
axis equal
axis off
box on
view(3)
camlight('right')
hPatch.FaceColor = 'flat'
hPatch.FaceVertexCData = repmat([1 0 0],[size(F,1) 1])
fun = @(hPatch,hif,face)set(hPatch,'FaceVertexCData',[hPatch.FaceVertexCData(1:(face-1),:); [0 1 0]; hPatch.FaceVertexCData((face+1):end,:)])
hPatch.ButtonDownFcn = @(hPatch,hit)swplot.patchfacefcn(hPatch,hit,fun,'face')

Input Arguments#

hPatch

Handle of the patch object.

hit

Hit object that contains the point where the object was hit.

callbackFun

User function that will be called in case of a click event on hPatch object. It should have the following header: callbackFun(hPatch,hit,faceIndex) where faceIndex contains the index of the face that was clicked on, it can contain a single index or more depending on the selection type.

selection

String, that defines three diferent selection criteria when the callbackfun() function will be called:

  • 'face' The callbackFun() will be triggered if a face was clicked (numel(faceIndex)==1).

  • 'edge' The callbackfun() will be triggered if an edge is clicked (numel(faceIndex)==2).

  • 'all' The callbackfun() will be triggered for both faces and edges.

dLim

Upper limit of the absolute value of the determinant that determines whether a point is on a plane spanned by the two edges of a triangle. Default value is \(10^{-7}\) (tested).

See Also#

patch