xfpolys - fill a set of polygons

Calling Sequence

xfpolys(xpols,ypols,[fill])

Parameters

• xpols,ypols : matrices of the same size (p,n) (points of the polygons).
• fill : vector of size n or of size (p,n)

Description

xfpolys fills a set of polygons of the same size defined by the two matrices xpols and ypols . The coordinates of each polygon are stored in a column of xpols and ypols .

The polygons may be filled with a given color (flat) or painted with interpolated (shaded) colors.

flat color paintingIn this case fill should be a vector of size n . The pattern for filling polygon number i is given by fill(i) :

-if fill(i)<0 , the polygon is filled with pattern id -fill(i) .

-if fill(i)=0 , the polygon is drawn with the current dash style (or current color) and not filled.

-if fill(i)>0 , the polygon is filled with pattern id fill(i) . Then its contour is drawn with the current dash (or color) and closed if necessary.

interpolated color painting

In this case fill should be a matrix with same sizes as xpols and ypols . Note that p must be equal to 3 or 4.

fill(k,i) gives the color at the k th edge of polygon i .

Examples

    
    set('figure_style','new')
    a=gca();a.data_bounds=[0,-10;210,40];a.foreground=color('red');
    x1=[0,10,20,30,20,10,0]';
    y1=[15,30,30,15,0,0,15]';
    xpols=[x1 x1 x1 x1]; xpols=xpols+[0,60,120,180].*.ones(x1);
    ypols=[y1 y1 y1 y1];
    xfpolys(xpols,ypols,[-1,0,1,2])

    // interpolated colors
    clf()
    f=gcf();
    a=gca();a.data_bounds=[0,-10;40,30];a.isoview='on';
    x1=[0,10,20,10]';
    y1=[10,0,10,20]';
    c=linspace(2,100,4)';
    xpols=[x1 x1+20 x1+10 x1+10];
    ypols=[y1 y1    y1+10 y1-10];
    cols= [c c($:-1:1) c([3 4 1 2]) c]
    f.color_map=jetcolormap(max(cols));
    xfpolys(xpols,ypols,cols)
  
    // interpolated colors
    clf()
    f=gcf();
    x11=[0;20;20;0];y11=[10;10;30;30];c11=[10;10;30;30];
    x12=x11;y12=y11+20;c12=[20;20;1;1];c12=[30;30;10;10];
    x21=[0;30;30;0]+22;y21=[20;20;30;30];c21=[20;20;30;30];
    x22=x21;y22=y21+10;c22=[30;30;20;20];
    x31=[0;40;40;0]+55;y31=[0;0;30;30];c31=[0;0;30;30];
    x32=x31;y32=y31+30;c32=[30;30;0;0];
    X=[x11 x12 x21 x22 x31 x32];Y=[y11 y12 y21 y22 y31 y32];C=([c11 c12 c21 c22  c31 c32]+1)*5;
    a=gca();a.isoview='on';
    a.data_bounds=[min(X),min(Y);max(X),max(Y)];
    f=gcf();f.color_map=graycolormap(max(C));
    xfpolys(X,Y,C)

    
  

See Also

xfpoly ,   xpoly ,   xpolys ,  

Author

J.Ph.C.