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//
// cdexpert highlights the expert functions in CD. You probably
// don't want to use these unless you have to.
//
//
// cdexpert.c: test program for the cgmdraw module.
//
// Written by G. Edward Johnson <mailto:lorax@nist.gov>
// Date: January 1997
// Copyright: cd software produced by NIST, an agency of the
// U.S. government, is by statute not subject to copyright
// in the United States. Recipients of this software assume all
// responsibilities associated with its operation, modification
// and maintenance.
//
//
#include <stdio.h>
#include <math.h>
#include <string.h>
#include <stdlib.h>
#include "defines.h"
#include "cd.h"
#define CD_CHECK_RETURN( x ) \
if ( !( x ) ) \
{ \
cdImageDestroy( im ); \
fclose( outf ); \
return 1; \
}
int main()
{
// you must create a pointer to the image(s) that you will be using
// not suprisingly, it is of type cdImagePtr
cdImagePtr im;
cdPoint points[2];
// this is a pointer to the output file you will be using
FILE *outf;
// these will be index's into the color palette containing
// the corresponding colors
int black, white, blue;
// Create an image
im = cdImageStartCgm();
// now open the file lets call it cdexpert1.cgm
outf = fopen( "cdexp1.cgm", "wb" );
if ( !outf )
{
cdImageDestroy( im );
return 1;
}
// set its size to 500x500
CD_CHECK_RETURN( cdImageSetSize( im, 500, 500 ) );
// set Line, Marker, and Edge specification modes to absolute (0)
// the default is scaled (1)
CD_CHECK_RETURN( cdImageSetLineSpec( im, 0 ) );
CD_CHECK_RETURN( cdImageSetMarkerSpec( im, 0 ) );
CD_CHECK_RETURN( cdImageSetEdgeSpec( im, 0 ) );
// Clear the font list, then set it to just contain 1 font
CD_CHECK_RETURN( cdImageClearFonts( im ) );
CD_CHECK_RETURN( cdImageAddFont( im, "TIMES_ROMAN" ) );
// start the picture
CD_CHECK_RETURN( cdCgmHeader( im ) );
CD_CHECK_RETURN( cdCgmPic( im, 2 ) );
// allocate some colors (isn't this fun?)
// the first color allocated is the background color
white = cdImageColorAllocate( im, 255, 255, 255 );
black = cdImageColorAllocate( im, 0, 0, 0 );
blue = cdImageColorAllocate( im, 0, 0, 255 );
// fill attributes: Empty
CD_CHECK_RETURN( cdSetShapeFillAttrib( im, 4, -1, -1 ) );
// Edge attributes: dots, width 3, blue, visible edges.
CD_CHECK_RETURN( cdSetShapeEdgeAttrib( im, 2, 3, blue, 1 ) );
// Text attributes: Times, black, size 25
CD_CHECK_RETURN( cdSetTextAttrib( im, 1, black, 25 ) );
// Line attributes: Solid Black Line of Width 5
CD_CHECK_RETURN( cdSetLineAttrib( im, 1, 5, black ) );
// Marker attributes: style pluses, size 3, black
CD_CHECK_RETURN( cdSetMarkerAttrib( im, 2, 3, black ) );
// Now that we have set some attributes, lets do some drawing
// Draw a rectangle (10,450) is upper left, (350,350) is lower right
CD_CHECK_RETURN( cdRectangle( im, 10, 450, 350, 350 ) );
// Draw a line (300,100) to (400,100)
CD_CHECK_RETURN( cdLine( im, 300, 100, 400, 100 ) );
// Add Two markers
CD_CHECK_RETURN( cdMarker( im, 325, 150 ) );
CD_CHECK_RETURN( cdMarker( im, 375, 150 ) );
// lets put some text in the picture too.
// (100,100) is the point at the lower left corner of the text
CD_CHECK_RETURN( cdText( im, 100, 100, "Hello World" ) );
// we could just finish off the CGM here with a
// cdImageCgm(im, outf), but lets put another picture in.
// close the picture
CD_CHECK_RETURN( cdImageEndPic( im ) );
// set the specifications modes back to the default
CD_CHECK_RETURN( cdImageSetLineSpec( im, 1 ) );
CD_CHECK_RETURN( cdImageSetMarkerSpec( im, 1 ) );
CD_CHECK_RETURN( cdImageSetEdgeSpec( im, 1 ) );
// start a new picture, keeping all the changes we made, including
// the color table
CD_CHECK_RETURN( cdCgmPic( im, 1 ) );
// draw the same image again, notice the Specification modes are
// different
// Draw a rectangle (10,450) is upper left, (350,350) is lower right
CD_CHECK_RETURN( cdRectangle( im, 10, 450, 350, 350 ) );
// Draw a line (300,100) to (400,100)
CD_CHECK_RETURN( cdLine( im, 300, 100, 400, 100 ) );
// Add Two markers
// we are doing the markers a little bit differently this time
points[0].x = 325;
points[0].y = 150;
points[1].x = 375;
points[1].y = 150;
CD_CHECK_RETURN( cdPolyMarker( im, points, 2 ) );
// lets put some text in the picture too.
// (100,100) is the point at the lower left corner of the text
CD_CHECK_RETURN( cdText( im, 100, 100, "Hello World" ) );
cdImageCgm( im, outf );
fclose( outf );
outf = 0;
// Remember to destroy the image when you are done
cdImageDestroy( im );
im = 0;
printf( "I am a CGM expert!!!\n" );
return 0;
}
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