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.TH xchange 2 "April 1993" "Scilab Group" "Scilab Function"
.so ../sci.an
.SH NAME
xchange - transform real to pixel coordinates
.SH CALLING SEQUENCE
.nf
[x1,y1,rect]=xchange(x,y,dir)
.fi
.SH PARAMETERS
.TP 7
x,y
: two matrices of size (n1,n2) (coordinates of a set of points).
.TP
x1,y1
: two matrices of size (n1,n2) (coordinates of the set of points).
.TP
rect
: a vector of size 4.
.SH DESCRIPTION
After having used a graphics function, \fVxchange\fR computes pixel
coordinates from real coordinates and conversely,
according to the value of the parameter \fVdir\fR:
"f2i" (float to int) means real to pixel and "i2f" (int to float)
means pixel to real.
\fVx1\fR and \fVy1\fR are the new coordinates of the set of points
defined by the old coordinates \fVx\fR and \fVy\fR.
\fVrect\fR is the coordinates in pixel
of the rectangle in which the plot was done: [upper-left point,
width, height].
.SH EXAMPLE
.nf
t=[0:0.1:2*%pi]';
plot2d(t,sin(t))
[x,y,rect]=xchange(1,1,"f2i")
[x,y,rect]=xchange(0,0,"i2f")
.fi
.SH AUTHOR
J.Ph.C.
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