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#include <stdlib.h>
#include <math.h>
#include <assert.h>
#include <string.h>
#include "../gfxdevice.h"
#include "poly.h"
static edge_t*edge_new(int x1, int y1, int x2, int y2)
{
edge_t*s = malloc(sizeof(edge_t));
s->a.x = x1;
s->a.y = y1;
s->b.x = x2;
s->b.y = y2;
s->next = 0;
return s;
}
static inline void gfxpoly_add_edge(gfxpoly_t*poly, double _x1, double _y1, double _x2, double _y2)
{
int x1 = ceil(_x1);
int y1 = ceil(_y1);
int x2 = ceil(_x2);
int y2 = ceil(_y2);
if(x1!=x2 || y1!=y2) {
edge_t*s = edge_new(x1, y1, x2, y2);
s->next = poly->edges;
poly->edges = s;
}
}
gfxpoly_t* gfxpoly_fillToPoly(gfxline_t*line, double gridsize)
{
gfxpoly_t*p = gfxpoly_new(gridsize);
/* factor that determines into how many line fragments a spline is converted */
double subfraction = 2.4;//0.3
double z = 1.0 / gridsize;
double lastx=0, lasty=0;
assert(!line || line[0].type == gfx_moveTo);
while(line) {
double x = line->x*z;
double y = line->y*z;
if(line->type == gfx_moveTo) {
} else if(line->type == gfx_lineTo) {
gfxpoly_add_edge(p, lastx, lasty, x, y);
} else if(line->type == gfx_splineTo) {
int parts = (int)(sqrt(fabs(line->x-2*line->sx+lastx) +
fabs(line->y-2*line->sy+lasty))*subfraction);
if(!parts) parts = 1;
double stepsize = 1.0/parts;
int i;
for(i=0;i<parts;i++) {
double t = (double)i*stepsize;
double sx = (line->x*t*t + 2*line->sx*t*(1-t) + x*(1-t)*(1-t))*z;
double sy = (line->y*t*t + 2*line->sy*t*(1-t) + y*(1-t)*(1-t))*z;
gfxpoly_add_edge(p, lastx, lasty, sx, sy);
lastx = sx;
lasty = sy;
}
gfxpoly_add_edge(p, lastx, lasty, x, y);
}
lastx = x;
lasty = y;
line = line->next;
}
gfxline_free(line);
return p;
}
static char* readline(FILE*fi)
{
char c;
while(1) {
int l = fread(&c, 1, 1, fi);
if(!l)
return 0;
if(c!=10 || c!=13)
break;
}
char line[256];
int pos = 0;
while(1) {
line[pos++] = c;
line[pos] = 0;
int l = fread(&c, 1, 1, fi);
if(!l || c==10 || c==13) {
return strdup(line);
}
}
}
gfxpoly_t* gfxpoly_from_file(const char*filename, double gridsize)
{
gfxpoly_t*p = gfxpoly_new(gridsize);
double z = 1.0 / gridsize;
FILE*fi = fopen(filename, "rb");
if(!fi) {
perror(filename);
return 0;
}
int count = 0;
double lastx=0,lasty=0;
while(1) {
char*line = readline(fi);
if(!line)
break;
double x,y;
char s[256];
if(sscanf(line, "%lf %lf %s", &x, &y, &s) == 3) {
x*=z;
y*=z;
if(s && !strcmp(s,"moveto")) {
count++;
} else if(s && !strcmp(s,"lineto")) {
gfxpoly_add_edge(p, lastx, lasty, x, y);
count++;
} else {
printf("invalid command: %s\n", s);
}
lastx = x;
lasty = y;
}
free(line);
}
fclose(fi);
printf("loaded %d points from %s\n", count, filename);
return p;
}
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