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scale.c
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scale.c
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/*
* Written by Marc Khoury
*/
#include <stdio.h>
#include <stdlib.h>
#include <graphviz/cgraph.h>
char* pos_to_str(double x, double y)
{
char buffer[256];
char* s;
int i,length;
length = sprintf(buffer, "%lf, %lf", x, y);
s = (char*) malloc(sizeof(char)*(length+1));
for(i = 0; i < length; i++) {
s[i] = buffer[i];
}
s[length] = '\0';
return s;
}
void usage()
{
printf("Usage: scale <scale> <infile>\n");
exit(1);
}
int main(int argc, char* argv[])
{
if(argc != 3)
usage();
float scale = atof(argv[1]);
FILE* fin = fopen(argv[2],"r");
Agraph_t* g = agread(fin, (Agdisc_t*)NULL);
Agnode_t* n;
for(n = agfstnode(g); n; n = agnxtnode(g,n)) {
char* pos = agget(n,"pos");
double x,y;
sscanf(pos,"%lf,%lf",&x,&y);
x *= scale;
y *= scale;
char* s = pos_to_str(x,y);
agset(n,"pos",s);
free(s);
}
agwrite(g,stdout);
agclose(g);
return 0;
}