gpatch

Below is a demonstration of the features of the gpatch function

Syntax
Description
Examples
Example: Introduction to using gpatch for mesh visualization
Using gpatch with cell arrays containing patch data

clear; close all; clc;

Syntax

[hp]=gpatch(F,V,C,CE,A,L);

Description

This function is a short-hand version of the patch command. The inputs for gpatch are the faces (F), the vertices (V), the color description (C), the edge color description CE, the transparancy (A), and the edge width (L). The color data descriptions C (or equivalently CE for edges) can be: 1) A string such as 'g' for green 2) A triplet of RGD values e.g. [1 0 0] is blue 3) A nx1 or a mx1 array of colormapped colors (where n=size(F,1) or m=size(V,1)) 4) (simiarl to 3) A nx3 or a mx3 RGB color value array for the faces or vertices respectively.

Examples

Create example mesh data

[F,V,~]=geoSphere(2,1); %Faces and vertices
CV=V(:,1); %Color information for vertices
CF=vertexToFaceMeasure(F,CV); %Color information for faces
CF_rgb=abs(vertexToFaceMeasure(F,V)); %Color information for faces

Example: Introduction to using `gpatch` for mesh visualization

The below visualization show the syntax require using patch and gpatch. Essentially gpatch is just a short-hand version of patch allowing for quick and easy visualization using patch graphics.

Using patch graphics in MATLAB see documentation on patch for more information

cFigure;
subplot(2,3,1);
title('Single face and edge color');
patch('Faces',F,'Vertices',V,'FaceColor','r','EdgeColor','g','FaceAlpha',0.5);
axisGeom;

subplot(2,3,2);
title('Colormapped face colors');
patch('Faces',F,'Vertices',V,'FaceColor','flat','CData',CF,'EdgeColor','k','FaceAlpha',1);
colormap gjet; colorbar;
axisGeom;

subplot(2,3,3);
title('RGB driven face colors');
patch('Faces',F,'Vertices',V,'FaceColor','flat','FaceVertexCData',CF_rgb,'EdgeColor','k','FaceAlpha',1,'LineWidth',3);
axisGeom;

subplot(2,3,4);
title('Colormapped edge colors');
patch('Faces',F,'Vertices',V,'FaceColor',grayColor(0.5),'EdgeColor','flat','CData',CV,'LineWidth',3);
colormap gjet; colorbar;
axisGeom;

subplot(2,3,5);
title('alpha mapping');
patch('Faces',F,'Vertices',V,'FaceColor','g','FaceVertexAlphaData',CV,'EdgeColor','none','FaceAlpha','flat');
axisGeom;

drawnow;

% Using |gpatch| shorthand alternative to |patch|

cFigure;
subplot(2,3,1);
title('Single face and edge color');
gpatch(F,V,'r','g',0.5);
axisGeom;

subplot(2,3,2);
title('Colormapped face colors');
gpatch(F,V,CF);
colormap gjet; colorbar;
axisGeom;

subplot(2,3,3);
title('RGB driven face colors');
gpatch(F,V,CF_rgb,'k',1,3);
axisGeom;

subplot(2,3,4);
title('Colormapped edge colors');
gpatch(F,V,'kw',CV,1,3); %kw -> grayColor(0.5)
colormap gjet; colorbar;
axisGeom;

subplot(2,3,5);
title('alpha mapping');
gpatch(F,V,'g','none',CV);
axisGeom;

drawnow;

Using `gpatch` with cell arrays containing patch data

Use of gpatch when both the faces and vertices are stored in a cell array

% Create example cell arrays
[F1,V1]=graphicsModels(1); V1=V1-mean(V1,1); V1=V1./max(V1(:)); V1=V1-1;
[F2,V2]=graphicsModels(2); V2=V2-mean(V2,1); V2=V2./max(V2(:));
[F3,V3]=graphicsModels(3); V3=V3-mean(V3,1); V3=V3./max(V3(:)); V3=V3+1;
F={F1,F2,F3}; %Cell array containing faces
V={V1,V2,V3}; %Cell array containing vertices
C={ones(size(F1,1),1),2*ones(size(F2,1),1),3*ones(size(F3,1),1)}; %Cell array containing color labels

cFigure;
title('Cell array of patch data');
hp=gpatch(F,V,C,'none',1);
axisGeom; camlight headlight;
colormap spectral; icolorbar;
drawnow;

Use of gpatch when only the faces are stored in a cell array

% Create example cell array

[F1,V1]=graphicsModels(1); V1=V1-mean(V1,1); V1=V1./max(V1(:)); V1=V1-1;
[F2,V2]=graphicsModels(2); V2=V2-mean(V2,1); V2=V2./max(V2(:));
[F3,V3]=graphicsModels(3); V3=V3-mean(V3,1); V3=V3./max(V3(:)); V3=V3+1;
F={F1,F2+size(V1,1),F3+size(V1,1)+size(V2,1)}; %Cell array containing faces
V=[V1;V2;V3]; %Normal array containing all vertices
C={ones(size(F1,1),1),2*ones(size(F2,1),1),3*ones(size(F3,1),1)}; %Cell array containing color labels

cFigure;
title('Cell array of patch data');
hp=gpatch(F,V,C,'none',1);
axisGeom; camlight headlight;
colormap spectral; icolorbar;
drawnow;

GIBBON www.gibboncode.org

Kevin Mattheus Moerman, [email protected]

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License: https://github.com/gibbonCode/GIBBON/blob/master/LICENSE

GIBBON: The Geometry and Image-based Bioengineering add-On. A toolbox for image segmentation, image-based modeling, meshing, and finite element analysis.

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

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gpatch

Contents

Syntax

Description

Examples

Example: Introduction to using gpatch for mesh visualization

Using gpatch with cell arrays containing patch data

Example: Introduction to using `gpatch` for mesh visualization

Using `gpatch` with cell arrays containing patch data