coneplot

Plot velocity vectors as cones in 3-D vector field

Syntax

coneplot(X,Y,Z,U,V,W,Cx,Cy,Cz) coneplot(U,V,W,Cx,Cy,Cz) coneplot(...,s) coneplot(...,color) coneplot(...,'quiver') coneplot(...,'method') coneplot(X,Y,Z,U,V,W,'nointerp') coneplot(axes_handle,...) h = coneplot(...)

Description

coneplot(X,Y,Z,U,V,W,Cx,Cy,Cz)plots velocity vectors as cones pointing in the direction of the velocity vector and having a length proportional to the magnitude of the velocity vector.X,Y,Zdefine the coordinates for the vector field.U,V,Wdefine the vector field. These arrays must be the same size, monotonic, and represent a Cartesian, axis-aligned grid (such as the data produced bymeshgrid).Cx,Cy,Czdefine the location of the cones in the vector field. The sectionSpecifying Starting Points for Stream Plotsin Visualization Techniques provides more information on defining starting points.

coneplot(U,V,W,Cx,Cy,Cz)(omitting theX,Y, andZarguments) assumes[X,Y,Z] = meshgrid(1:n,1:m,1:p), where[m,n,p]= size(U).

coneplot(...,s)automatically scales the cones to fit the graph and then stretches them by the scale factors. If you do not specify a value fors,coneplotuses a value of 1. Uses = 0to plot the cones without automatic scaling.

coneplot(...,color)interpolates the arraycoloronto the vector field and then colors the cones according to the interpolated values. The size of thecolorarray must be the same size as theU,V,Warrays. This option works only with cones (that is, not with thequiveroption).

coneplot(...,'quiver')draws arrows instead of cones (seequiver3for an illustration of a quiver plot).

coneplot(...,'method')specifies the interpolation method to use.methodcan belinear,cubic, ornearest.linearis the default. (Seeinterp3for a discussion of these interpolation methods.)

coneplot(X,Y,Z,U,V,W,'nointerp')does not interpolate the positions of the cones into the volume. The cones are drawn at positions defined byX,Y,Zand are oriented according toU,V,W. ArraysX,Y,Z,U,V,Wmust all be the same size.

coneplot(axes_handle,...)plots into the axes with the handleaxes_handleinstead of into the current axes (gca).

h = coneplot(...)returns the handle to thepatchobject used to draw the cones.

coneplotautomatically scales the cones to fit the graph, while keeping them in proportion to the respective velocity vectors.

Examples

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3-D Cone Plot

Open Script

Plot velocity vector cones for vector volume data representing motion of air through a rectangular region of space.

Load the data. Thewinddata set contains the arraysu,v, andwthat specify the vector components and the arraysx,y, andzthat specify the coordinates.

loadwind

Establish the range of the data to place the slice planes and to specify where you want the cone plots.

xmin = min(x(:)); xmax = max(x(:)); ymin = min(y(:)); ymax = max(y(:)); zmin = min(z(:));

Define where to plot the cones. Select the full range inxandyand select the range 3 to 15 inz.

xrange = linspace(xmin,xmax,8); yrange = linspace(ymin,ymax,8); zrange = 3:4:15; [cx,cy,cz] = meshgrid(xrange,yrange,zrange);

Plot the cones and set the scale factor to 5 to make the cones larger than the default size.

figure hcone = coneplot(x,y,z,u,v,w,cx,cy,cz,5);

Set the cone colors.

hcone.FaceColor =“红色”; hcone.EdgeColor ='none';

Calculate the magnitude of the vector field (which represents wind speed) to generate scalar data for theslicecommand.

holdonwind_speed = sqrt(u.^2 + v.^2 + w.^2);

Create slice planes along thex-axis atxminandxmax, along they-axis atymax, and along thez-axis atzmin. Specify interpolated face color so the slice coloring indicates wind speed, and do not draw edges.

hsurfaces = slice(x,y,z,wind_speed,[xmin,xmax],ymax,zmin); set(hsurfaces,'FaceColor','interp','EdgeColor','none') hold从

Change the axes view and set the data aspect ratio.

view(30,40) daspect([2,2,1])

Add a light source to the right of the camera and use Gouraud lighting to give the cones and slice planes a smooth, three-dimensional appearance.

camlightrightlightinggouraudset(hsurfaces,'AmbientStrength',0.6) hcone.DiffuseStrength = 0.8;

Documentation

coneplot

Syntax

Description

Examples

3-D Cone Plot

See Also

Topics

Introduced before R2006a

MATLAB Documentation

Other Documentation

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