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See the recommended documentation of this function
xfpolys
fill a set of polygons
Calling Sequence
xfpolys(xpols,ypols,[fill])
Arguments
- 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 painting
In this case
fill
should be a vector of sizen
. The pattern for filling polygon number i is given byfill(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 idfill(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 asxpols
andypols
. Note thatp
must be equal to 3 or 4.fill(k,i)
gives the color at thek
th edge of polygoni
.
Examples
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
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