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<head>
<title>addpt(3) - Plan 9 from User Space</title>
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<tr><td width=20><td><b>ADDPT(3)</b><td align=right><b>ADDPT(3)</b>
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<br>
<p><font size=+1><b>NAME </b></font><br>
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addpt, subpt, mulpt, divpt, rectaddpt, rectsubpt, insetrect, canonrect,
eqpt, eqrect, ptinrect, rectinrect, rectXrect, rectclip, combinerect,
Dx, Dy, Pt, Rect, Rpt – arithmetic on points and rectangles<br>
</table>
<p><font size=+1><b>SYNOPSIS </b></font><br>
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<tt><font size=+1>#include <u.h><br>
#include <libc.h><br>
#include <draw.h>
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<tt><font size=+1>Point addpt(Point p, Point q)
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<tt><font size=+1>Point subpt(Point p, Point q)
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<tt><font size=+1>Point mulpt(Point p, int a)
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<tt><font size=+1>Point divpt(Point p, int a)
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<tt><font size=+1>Rectangle rectaddpt(Rectangle r, Point p)
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<tt><font size=+1>Rectangle rectsubpt(Rectangle r, Point p)
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<tt><font size=+1>Rectangle insetrect(Rectangle r, int n)
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</font></tt>
<tt><font size=+1>Rectangle canonrect(Rectangle r)
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</font></tt>
<tt><font size=+1>int eqpt(Point p, Point q)
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<tt><font size=+1>int eqrect(Rectangle r, Rectangle s)
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<tt><font size=+1>int ptinrect(Point p, Rectangle r)
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<tt><font size=+1>int rectinrect(Rectangle r, Rectangle s)
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<tt><font size=+1>int rectXrect(Rectangle r, Rectangle s)
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<tt><font size=+1>int rectclip(Rectangle *rp, Rectangle b)
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</font></tt>
<tt><font size=+1>void combinerect(Rectangle *rp, Rectangle b)
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<tt><font size=+1>int Dx(Rectangle r)
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<tt><font size=+1>int Dy(Rectangle r)
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<tt><font size=+1>Point Pt(int x, int y)
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<tt><font size=+1>Rectangle Rect(int x0, int y0, int x1, int y1)
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<tt><font size=+1>Rectangle Rpt(Point p, Point q)<br>
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<p><font size=+1><b>DESCRIPTION </b></font><br>
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The functions <i>Pt</i>, <i>Rect</i> and <i>Rpt</i> construct geometrical data types
from their components.
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<i>Addpt</i> returns the Point sum of its arguments: <tt><font size=+1>Pt(</font></tt><i>p</i><tt><font size=+1>.x+</font></tt><i>q</i><tt><font size=+1>.x,</font></tt> <i>p</i><tt><font size=+1>.y+</font></tt><i>q</i><tt><font size=+1>.y)</font></tt>.
<i>Subpt</i> returns the Point difference of its arguments: <tt><font size=+1>Pt(</font></tt><i>p</i><tt><font size=+1>.x−</font></tt><i>q</i><tt><font size=+1>.x,</font></tt>
<i>p</i><tt><font size=+1>.y−</font></tt><i>q</i><tt><font size=+1>.y)</font></tt>. <i>Mulpt</i> returns the Point <tt><font size=+1>Pt(</font></tt><i>p</i><tt><font size=+1>.x*</font></tt><i>a</i><tt><font size=+1>,</font></tt> <i>p</i><tt><font size=+1>.y*</font></tt><i>a</i><tt><font size=+1>)</font></tt>. <i>Divpt</i> returns
the Point <tt><font size=+1>Pt(</font></tt><i>p</i><tt><font size=+1>.x/</font></tt><i>a</i><tt><font size=+1>,</font></tt> <i>p</i><tt><font size=+1>.y/</font></tt><i>a</i><tt><font size=+1>)</font></tt>.
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<i>Rectaddpt</i> returns the Rectangle <tt><font size=+1>Rect(add(</font></tt><i>r</i><tt><font size=+1>.min,</font></tt> <i>p</i><tt><font size=+1>)</font></tt>, <tt><font size=+1>add(</font></tt><i>r</i><tt><font size=+1>.max,</font></tt>
<i>p</i><tt><font size=+1>))</font></tt>; <i>rectsubpt</i> returns the Rectangle <tt><font size=+1>Rpt(sub(</font></tt><i>r</i><tt><font size=+1>.min,</font></tt> <i>p</i><tt><font size=+1>), sub(</font></tt><i>r</i><tt><font size=+1>.max,</font></tt>
<i>p</i><tt><font size=+1>))</font></tt>.
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<i>Insetrect</i> returns the Rectangle <tt><font size=+1>Rect(</font></tt><i>r</i><tt><font size=+1>.min.x+</font></tt><i>n</i>, <i>r</i><tt><font size=+1>.min.y+</font></tt><i>n</i>, <i>r</i><tt><font size=+1>.max.x−</font></tt><i>n</i>,
<i>r</i><tt><font size=+1>.max.y−</font></tt><i>n</i><tt><font size=+1>)</font></tt>.
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<i>Canonrect</i> returns a rectangle with the same extent as <i>r</i>, canonicalized
so that <tt><font size=+1>min.x </font></tt>≤ <tt><font size=+1>max.x</font></tt>, and <tt><font size=+1>min.y </font></tt>≤ <tt><font size=+1>max.y</font></tt>.
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<i>Eqpt</i> compares its argument Points and returns 0 if unequal, 1
if equal. <i>Eqrect</i> does the same for its argument Rectangles.
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<i>Ptinrect</i> returns 1 if <i>p</i> is a point within <i>r</i>, and 0 otherwise.
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<i>Rectinrect</i> returns 1 if all the pixels in <i>r</i> are also in <i>s</i>, and
0 otherwise.
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<i>RectXrect</i> returns 1 if <i>r</i> and <i>s</i> share any point, and 0 otherwise.
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<i>Rectclip</i> clips in place the Rectangle pointed to by <i>rp</i> so that
it is completely contained within <i>b</i>. The return value is 1 if
any part of *<i>rp</i> is within <i>b</i>. Otherwise, the return value is 0
and *<i>rp</i> is unchanged.
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<i>Combinerect</i> overwrites <tt><font size=+1>*rp</font></tt> with the smallest rectangle sufficient
to cover all the pixels of <tt><font size=+1>*rp</font></tt> and <tt><font size=+1>b</font></tt>.
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The functions <i>Dx</i> and <i>Dy</i> give the width (Δx) and height (Δy) of
a Rectangle. They are implemented as macros.<br>
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<p><font size=+1><b>SOURCE </b></font><br>
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<tt><font size=+1>/usr/local/plan9/src/libdraw<br>
</font></tt>
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<p><font size=+1><b>SEE ALSO </b></font><br>
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<a href="../man3/graphics.html"><i>graphics</i>(3)</a><br>
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