QPolygonF polygonFromPath(potrace_path_t *path,
int bezierPrecision)
{
QPolygonF poly;
if(!path) return poly;
int n = path->curve.n;
int *tag = path->curve.tag;
potrace_dpoint_t (*c)[3] = path->curve.c;
for(int i = 0; i < n; ++i)
{
switch (tag[i])
{
case POTRACE_CORNER:
poly << QPointF(c[i][1].x, c[i][1].y)
<< QPointF(c[i][2].x, c[i][2].y);
break;
case POTRACE_CURVETO:
{
QPointF pa, pb, pc, pd;
pa = poly.isEmpty()? QPointF(c[n-1][2].x, c[n-1][2].y) :
poly.last();
pb = QPointF(c[i][0].x, c[i][0].y);
pc = QPointF(c[i][1].x, c[i][1].y);
pd = QPointF(c[i][2].x, c[i][2].y);
for(int i = 1; i <= bezierPrecision; ++i)
{
poly << bezier(pa, pb, pc, pd, static_cast<qreal>(i)/bezierPrecision);
}
}
break;
}
}
if(!poly.isEmpty() && poly.first() == poly.last())
{
poly.remove(poly.size()-1);
}
return poly;
}
int main() {
int x, y, i;
potrace_bitmap_t *bm;
potrace_param_t *param;
potrace_path_t *p;
potrace_state_t *st;
int n, *tag;
potrace_dpoint_t(*c)[3];
/* create a bitmap */
bm = bm_new(WIDTH, HEIGHT);
if (!bm) {
fprintf(stderr, "Error allocating bitmap: %s\n", strerror(errno));
return 1;
}
/* fill the bitmap with some pattern */
for (y = 0; y < HEIGHT; y++) {
for (x = 0; x < WIDTH; x++) {
BM_PUT(bm, x, y, ((x * x + y * y * y) % 10000 < 5000) ? 1 : 0);
}
}
/* set tracing parameters, starting from defaults */
param = potrace_param_default();
if (!param) {
fprintf(stderr, "Error allocating parameters: %s\n", strerror(errno));
return 1;
}
param->turdsize = 0;
/* trace the bitmap */
st = potrace_trace(param, bm);
if (!st || st->status != POTRACE_STATUS_OK) {
fprintf(stderr, "Error tracing bitmap: %s\n", strerror(errno));
return 1;
}
bm_free(bm);
/* output vector data, e.g. as a rudimentary EPS file */
printf("%%!PS-Adobe-3.0 EPSF-3.0\n");
printf("%%%%BoundingBox: 0 0 %d %d\n", WIDTH, HEIGHT);
printf("gsave\n");
/* draw each curve */
p = st->plist;
while (p != NULL) {
n = p->curve.n;
tag = p->curve.tag;
c = p->curve.c;
printf("%f %f moveto\n", c[n - 1][2].x, c[n - 1][2].y);
for (i = 0; i < n; i++) {
switch (tag[i]) {
case POTRACE_CORNER:
printf("%f %f lineto\n", c[i][1].x, c[i][1].y);
printf("%f %f lineto\n", c[i][2].x, c[i][2].y);
break;
case POTRACE_CURVETO:
printf("%f %f %f %f %f %f curveto\n", c[i][0].x, c[i][0].y, c[i][1].x, c[i][1].y,
c[i][2].x, c[i][2].y);
break;
}
}
/* at the end of a group of a positive path and its negative
children, fill. */
if (p->next == NULL || p->next->sign == '+') {
printf("0 setgray fill\n");
}
p = p->next;
}
printf("grestore\n");
printf("%%EOF\n");
potrace_state_free(st);
potrace_param_free(param);
return 0;
}
void BITMAPCONV_INFO::CreateOutputFile( BMP2CMP_MOD_LAYER aModLayer )
{
std::vector <potrace_dpoint_t> cornersBuffer;
// polyset_areas is a set of polygon to draw
SHAPE_POLY_SET polyset_areas;
// polyset_holes is the set of holes inside polyset_areas outlines
SHAPE_POLY_SET polyset_holes;
potrace_dpoint_t( *c )[3];
LOCALE_IO toggle; // Temporary switch the locale to standard C to r/w floats
// The layer name has meaning only for .kicad_mod files.
// For these files the header creates 2 invisible texts: value and ref
// (needed but not usefull) on silk screen layer
OuputFileHeader( getBrdLayerName( MOD_LYR_FSILKS ) );
bool main_outline = true;
/* draw each as a polygon with no hole.
* Bezier curves are approximated by a polyline
*/
potrace_path_t* paths = m_Paths; // the list of paths
while( paths != NULL )
{
int cnt = paths->curve.n;
int* tag = paths->curve.tag;
c = paths->curve.c;
potrace_dpoint_t startpoint = c[cnt - 1][2];
for( int i = 0; i < cnt; i++ )
{
switch( tag[i] )
{
case POTRACE_CORNER:
cornersBuffer.push_back( c[i][1] );
cornersBuffer.push_back( c[i][2] );
startpoint = c[i][2];
break;
case POTRACE_CURVETO:
BezierToPolyline( cornersBuffer, startpoint, c[i][0], c[i][1], c[i][2] );
startpoint = c[i][2];
break;
}
}
// Store current path
if( main_outline )
{
main_outline = false;
// build the current main polygon
polyset_areas.NewOutline();
for( unsigned int i = 0; i < cornersBuffer.size(); i++ )
{
polyset_areas.Append( int( cornersBuffer[i].x * m_ScaleX ),
int( cornersBuffer[i].y * m_ScaleY ) );
}
}
else
{
// Add current hole in polyset_holes
polyset_holes.NewOutline();
for( unsigned int i = 0; i < cornersBuffer.size(); i++ )
{
polyset_holes.Append( int( cornersBuffer[i].x * m_ScaleX ),
int( cornersBuffer[i].y * m_ScaleY ) );
}
}
cornersBuffer.clear();
/* at the end of a group of a positive path and its negative children, fill.
*/
if( paths->next == NULL || paths->next->sign == '+' )
{
// Substract holes to main polygon:
polyset_areas.Simplify( SHAPE_POLY_SET::PM_FAST );
polyset_holes.Simplify( SHAPE_POLY_SET::PM_FAST );
polyset_areas.BooleanSubtract( polyset_holes, SHAPE_POLY_SET::PM_FAST );
polyset_areas.Fracture( SHAPE_POLY_SET::PM_STRICTLY_SIMPLE );
// Output current resulting polygon(s)
for( int ii = 0; ii < polyset_areas.OutlineCount(); ii++ )
{
SHAPE_LINE_CHAIN& poly = polyset_areas.Outline( ii );
OuputOnePolygon(poly, getBrdLayerName( aModLayer ) );
}
polyset_areas.RemoveAllContours();
polyset_holes.RemoveAllContours();
main_outline = true;
}
paths = paths->next;
}
OuputFileEnd();
}