bugfix: #562 didn't take into account that it's allowed with all X coordinates being negative

src/PolySetCGALEvaluator.cc

@@ -455,19 +455,21 @@ PolySet *PolySetCGALEvaluator::rotateDxfData(const RotateExtrudeNode &node, DxfD
 
 	for (size_t i = 0; i < dxf.paths.size(); i++)
 	{
+		double min_x = 0;
 		double max_x = 0;
 		for (size_t j = 0; j < dxf.paths[i].indices.size(); j++) {
 			double point_x = dxf.points[dxf.paths[i].indices[j]][0];
-			if (point_x < 0) {
-				PRINT("ERROR: all points for rotate_extrude() must have non-negative X coordinates");
-				PRINTB("[Point %d on path %d has X coordinate %f]", j % i % point_x);
+			min_x = fmin(min_x, point_x);
+			max_x = fmax(max_x, point_x);
+
+			if ((max_x - min_x) > max_x && (max_x - min_x) > fabs(min_x)) {
+				PRINTB("ERROR: all points for rotate_extrude() must have the same X coordinate sign (range is %.2f -> %.2f)", min_x % max_x);
 				delete ps;
 				return NULL;
 			}
-			max_x = fmax(max_x, point_x);
 		}
 
-		int fragments = get_fragments_from_r(max_x, node.fn, node.fs, node.fa);
+		int fragments = get_fragments_from_r(max_x-min_x, node.fn, node.fs, node.fa);
 
 		double ***points;
 		points = new double**[fragments];

testdata/scad/features/rotate_extrude-tests.scad

@@ -32,3 +32,6 @@ translate([50,50,0]) {
 // Minimal $fn
 translate([0,-60,0]) rotate_extrude($fn=1) translate([20,0,0]) circle(r=10,$fn=1);
 
+// Object in negative X
+translate([0,60,0]) rotate_extrude() translate([-20,0]) square(10);
+

tests/regression/dumptest/rotate_extrude-tests-expected.csg

@@ -50,4 +50,11 @@ group() {
 			}
 		}
 	}
+	multmatrix([[1, 0, 0, 0], [0, 1, 0, 60], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+		rotate_extrude(convexity = 1, $fn = 0, $fa = 12, $fs = 2) {
+			multmatrix([[1, 0, 0, -20], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+				square(size = [10, 10], center = false);
+			}
+		}
+	}
 }