Clifford Wolf:

	Added STL export



git-svn-id: http://svn.clifford.at/openscad/trunk@53 b57f626f-c46c-0410-a088-ec61d464b74c

2 files changed, 94 insertions, 2 deletions

diff --git a/example.scad b/example.scad
index f91d22f..193ec73 100644
--- a/example.scad
+++ b/example.scad
@@ -1,6 +1,7 @@
 
 module test001()
 {
+	$fn = 100;
 	function r_from_dia(d) = d / 2;
 
 	module rotcy(rot, r, h) {
@@ -80,7 +81,7 @@ module test005()
 				cylinder(h = 200, r=10);
 		}
 		translate([0 0 200])
-			cylinder(h = 80, r1 = 120, r2 = 0);
+			cylinder(h = 80, r1 = 120, r2 = 1);
 	}
 }
 
diff --git a/mainwin.cc b/mainwin.cc
index 0905d66..79aa0a9 100644
--- a/mainwin.cc
+++ b/mainwin.cc
@@ -644,7 +644,98 @@ void MainWindow::actionDisplayCSGProducts()
 void MainWindow::actionExportSTL()
 {
 	current_win = this;
-	PRINTA("Function %1 is not implemented yet!", QString(__PRETTY_FUNCTION__));
+
+	if (!root_N) {
+		PRINT("Nothing to export! Try building first (press F6).");
+		current_win = NULL;
+		return;
+	}
+
+	if (!root_N->is_simple()) {
+		PRINT("Object isn't a single polyeder or otherwise invalid! Modify your design..");
+		current_win = NULL;
+		return;
+	}
+
+	QString stl_filename = QFileDialog::getSaveFileName(this, "Export STL File", "", "STL Files (*.stl)");
+	if (stl_filename.isEmpty()) {
+		PRINT("No filename specified. STL export aborted.");
+		current_win = NULL;
+		return;
+	}
+
+	CGAL_Polyhedron P;
+	root_N->convert_to_Polyhedron(P);
+
+	typedef CGAL_Polyhedron::Vertex                                 Vertex;
+	typedef CGAL_Polyhedron::Vertex_const_iterator                  VCI;
+	typedef CGAL_Polyhedron::Facet_const_iterator                   FCI;
+	typedef CGAL_Polyhedron::Halfedge_around_facet_const_circulator HFCC;
+
+	FILE *f = fopen(stl_filename.toAscii().data(), "w");
+	if (!f) {
+		PRINT("Can't open STL file for STL export.");
+		current_win = NULL;
+		return;
+	}
+	fprintf(f, "solid\n");
+
+	QProgressDialog *pd = new QProgressDialog("Exporting object to STL file...",
+			QString(), 0, root_N->number_of_facets() + 1);
+	pd->setValue(0);
+	pd->setAutoClose(false);
+	pd->show();
+	QApplication::processEvents();
+
+	int facet_count = 0;
+	for (FCI fi = P.facets_begin(); fi != P.facets_end(); ++fi) {
+		HFCC hc = fi->facet_begin();
+		HFCC hc_end = hc;
+		Vertex v1, v2, v3;
+		v1 = *VCI((hc++)->vertex());
+		v3 = *VCI((hc++)->vertex());
+		do {
+			v2 = v3;
+			v3 = *VCI((hc++)->vertex());
+			double x1 = CGAL::to_double(v1.point().x());
+			double y1 = CGAL::to_double(v1.point().y());
+			double z1 = CGAL::to_double(v1.point().z());
+			double x2 = CGAL::to_double(v2.point().x());
+			double y2 = CGAL::to_double(v2.point().y());
+			double z2 = CGAL::to_double(v2.point().z());
+			double x3 = CGAL::to_double(v3.point().x());
+			double y3 = CGAL::to_double(v3.point().y());
+			double z3 = CGAL::to_double(v3.point().z());
+			QString vs1, vs2, vs3;
+			vs1.sprintf("%f %f %f", x1, y1, z1);
+			vs2.sprintf("%f %f %f", x2, y2, z2);
+			vs3.sprintf("%f %f %f", x3, y3, z3);
+			if (vs1 != vs2 && vs1 != vs3 && vs2 != vs3) {
+				
+				double nx = (y1-y2)*(z1-z3) - (z1-z2)*(y1-y3);
+				double ny = (z1-z2)*(x1-x3) - (x1-x2)*(z1-z3);
+				double nz = (x1-x2)*(y1-y3) - (y1-y2)*(x1-x3);
+				double n_scale = 1 / sqrt(nx*nx + ny*ny + nz*nz);
+				fprintf(f, "  facet normal %f %f %f\n",
+						nx * n_scale, ny * n_scale, nz * n_scale);
+				fprintf(f, "    outer loop\n");
+				fprintf(f, "      vertex %s\n", vs1.toAscii().data());
+				fprintf(f, "      vertex %s\n", vs2.toAscii().data());
+				fprintf(f, "      vertex %s\n", vs3.toAscii().data());
+				fprintf(f, "    endloop\n");
+				fprintf(f, "  endfacet\n");
+			}
+		} while (hc != hc_end);
+		pd->setValue(facet_count++);
+		QApplication::processEvents();
+	}
+
+	fprintf(f, "endsolid\n");
+	fclose(f);
+
+	PRINT("STL export finished.");
+
+	delete pd;
 	current_win = NULL;
 }