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/*
* TASK 1: Scalable Vector Graphics (SVG)
*
* Example:
*
* 53,10
* 53,10,23,30
* 23,30
*
* GUEST LANGUAGE: This is my attempt to translate ch-1.pl and MySVG.pm into C
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <ctype.h>
#include <assert.h>
#include "MySVG.h"
bool debug=0;
// process_noarg( argc, argv );
// Process the -d flag, and check that there are NO
// arguments left.
void process_noarg( int argc, char **argv )
{
int arg=1;
if( argc>1 && strcmp( argv[arg], "-d" ) == 0 )
{
debug = true;
arg++;
}
int left = argc-arg;
if( left != 0 )
{
fprintf( stderr,
"Usage: mk-svg [-d] < inputfile\n" );
exit(1);
}
}
typedef struct { int x, y; } datapoint;
typedef struct { int x1, y1, x2, y2; } dataline;
#define MAXITEMS 1024
int npoints = 0;
datapoint pt[MAXITEMS]; // input points
int nlines = 0;
dataline ln[MAXITEMS]; // lines, each line an [x1,y1,x2,y2] tuple
datapoint wh; // wh.x == width of our data, wh.y == height of our data
/*
* updatewh( x, y );
* Update wh to include x and y.
*/
void updatewh( int x, int y )
{
assert( x>=0 );
assert( y>=0 );
if( x > wh.x ) wh.x = x;
if( y > wh.y ) wh.y = y;
}
/*
* bool lineread = readline( in, buf, maxlen );
* read a single line from in (a FILE * open for input)
* into a character buffer (char *), reading no more than
* maxlen characters, removing a trailing '\n' from the
* buffer (if there is one).
*
* If the input line is longer than that, the REMAINDER OF
* THE LINE IS LEFT IN the file's input buffer for later reading.
* If readline() is called again immediately, the remainder of
* the line will be treated as a separate line.
*
* In caller-space, buf must be a writable character buffer of
* size >= maxlen, i.e. typically either a char [n]
* or a malloc(n * sizeof(char)) chunk,
* where (in both cases) n >= maxlen
*/
bool readline( FILE *in, char *buf, int maxlen )
{
if( fgets( buf, maxlen, in ) == 0 )
{
return false;
}
int l = strlen(buf);
if( l>0 && buf[l-1]=='\n' )
{
buf[l-1] = '\0';
}
return true;
}
/*
*
* read_data( in );
* Read data (points and lines) from in.
*/
void read_data( FILE *in )
{
#define MAXLINELEN 100
char line[MAXLINELEN];
npoints = 0;
nlines = 0;
while( readline(in, line, MAXLINELEN ) )
{
int x1, y1, x2, y2;
char *s;
char *p;
s = line;
assert( isdigit(*s) );
p = strchr(s,',');
assert( p != NULL );
*p = '\0';
x1 = atoi(s);
s = p+1;
assert( isdigit(*s) );
y1 = atoi(s);
p = strchr(s,',');
if( p != NULL ) // must be a line
{
*p = '\0';
s = p+1;
assert( isdigit(*s) );
p = strchr(s,',');
assert( p != NULL );
*p = '\0';
x2 = atoi(s);
s = p+1;
assert( isdigit(*s) );
y2 = atoi(s);
//printf( "debug: read line %d,%d, %d,%d\n", x1, y1, x2, y2 );
ln[nlines].x1 = x1;
ln[nlines].y1 = y1;
ln[nlines].x2 = x2;
ln[nlines].y2 = y2;
nlines++;
updatewh( x1, y1 );
updatewh( x2, y2 );
} else
{
//printf( "debug: read point %d,%d\n", x1, y1 );
pt[npoints].x = x1;
pt[npoints].y = y1;
npoints++;
updatewh( x1, y1 );
}
}
}
int main( int argc, char **argv )
{
process_noarg( argc, argv );
wh.x = -1;
wh.y = -1;
read_data( stdin );
int w = wh.x;
int h = wh.y;
w += (10-w%10);
h += (10-h%10);
int xscale = w < 200 ? 200/w : 1;
int yscale = h < 200 ? 200/h : 1;
fprintf( stderr, "maxxy rectangle is w %d, h %d, xscale %d, yscale %d\n", w, h, xscale, yscale );
start_svg( w * xscale, h * yscale );
setcolour( "blue" );
setlinewidth( 1 );
for( int i=0; i<nlines; i++ )
{
// printf( "debug: generating line for ln[%d]: %d,%d, %d,%d\n",
// i, ln[i].x1, ln[i].y1, ln[i].x2, ln[i].y2 );
line( ln[i].x1*xscale, ln[i].y1*yscale,
ln[i].x2*xscale, ln[i].y2*yscale );
}
setcolour( "orange" );
for( int i=0; i<npoints; i++ )
{
point( pt[i].x*xscale, pt[i].y*yscale );
}
end_svg();
return 0;
}
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