/usr/share/doc/libplplot12/examples/c/x25c.c is in libplplot-dev 5.10.0+dfsg2-0.1ubuntu2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 | // $Id: x25c.c 11289 2010-10-29 20:44:17Z airwin $
//
// Filling and clipping polygons.
//
#include "plcdemos.h"
//--------------------------------------------------------------------------
// main
//
// Test program for filling polygons and proper clipping
//--------------------------------------------------------------------------
int
main( int argc, const char *argv[] )
{
int i, j, k;
int npts = 0;
PLFLT xextreme[10][2];
PLFLT yextreme[10][2];
PLFLT x0[10];
PLFLT y0[10];
// Parse and process command line arguments
(void) plparseopts( &argc, argv, PL_PARSE_FULL );
// Initialize plplot
plssub( 3, 3 );
plinit();
xextreme[0][0] = -120.0; xextreme[0][1] = 120.0; yextreme[0][0] = -120.0; yextreme[0][1] = 120.0;
xextreme[1][0] = -120.0; xextreme[1][1] = 120.0; yextreme[1][0] = 20.0; yextreme[1][1] = 120.0;
xextreme[2][0] = -120.0; xextreme[2][1] = 120.0; yextreme[2][0] = -20.0; yextreme[2][1] = 120.0;
xextreme[3][0] = -80.0; xextreme[3][1] = 80.0; yextreme[3][0] = -20.0; yextreme[3][1] = 120.0;
xextreme[4][0] = -220.0; xextreme[4][1] = -120.0; yextreme[4][0] = -120.0; yextreme[4][1] = 120.0;
xextreme[5][0] = -20.0; xextreme[5][1] = 20.0; yextreme[5][0] = -120.0; yextreme[5][1] = 120.0;
xextreme[6][0] = -20.0; xextreme[6][1] = 20.0; yextreme[6][0] = -20.0; yextreme[6][1] = 20.0;
xextreme[7][0] = -80.0; xextreme[7][1] = 80.0; yextreme[7][0] = -80.0; yextreme[7][1] = 80.0;
xextreme[8][0] = 20.0; xextreme[8][1] = 120.0; yextreme[8][0] = -120.0; yextreme[8][1] = 120.0;
for ( k = 0; k < 2; k++ )
{
for ( j = 0; j < 4; j++ )
{
if ( j == 0 )
{
// Polygon 1: a diamond
x0[0] = 0; y0[0] = -100;
x0[1] = -100; y0[1] = 0;
x0[2] = 0; y0[2] = 100;
x0[3] = 100; y0[3] = 0;
npts = 4;
}
if ( j == 1 )
{
// Polygon 1: a diamond - reverse direction
x0[3] = 0; y0[3] = -100;
x0[2] = -100; y0[2] = 0;
x0[1] = 0; y0[1] = 100;
x0[0] = 100; y0[0] = 0;
npts = 4;
}
if ( j == 2 )
{
// Polygon 2: a square with punctures
x0[0] = -100; y0[0] = -100;
x0[1] = -100; y0[1] = -80;
x0[2] = 80; y0[2] = 0;
x0[3] = -100; y0[3] = 80;
x0[4] = -100; y0[4] = 100;
x0[5] = -80; y0[5] = 100;
x0[6] = 0; y0[6] = 80;
x0[7] = 80; y0[7] = 100;
x0[8] = 100; y0[8] = 100;
x0[9] = 100; y0[9] = -100;
npts = 10;
}
if ( j == 3 )
{
// Polygon 2: a square with punctures - reversed direction
x0[9] = -100; y0[9] = -100;
x0[8] = -100; y0[8] = -80;
x0[7] = 80; y0[7] = 0;
x0[6] = -100; y0[6] = 80;
x0[5] = -100; y0[5] = 100;
x0[4] = -80; y0[4] = 100;
x0[3] = 0; y0[3] = 80;
x0[2] = 80; y0[2] = 100;
x0[1] = 100; y0[1] = 100;
x0[0] = 100; y0[0] = -100;
npts = 10;
}
for ( i = 0; i < 9; i++ )
{
pladv( 0 );
plvsta();
plwind( xextreme[i][0], xextreme[i][1], yextreme[i][0], yextreme[i][1] );
plcol0( 2 );
plbox( "bc", 1.0, 0, "bcnv", 10.0, 0 );
plcol0( 1 );
plpsty( 0 );
if ( k == 0 )
plfill( npts, x0, y0 );
else
plgradient( npts, x0, y0, 45. );
plcol0( 2 );
pllsty( 1 );
plline( npts, x0, y0 );
}
}
}
// Don't forget to call plend() to finish off!
plend();
exit( 0 );
}
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