Fixed issue #305 (CIF reader issue with rotated boxes)

src/plugins/streamers/cif/db_plugin/dbCIFReader.cc

@@ -592,11 +592,13 @@ CIFReader::read_cell (db::Layout &layout, db::Cell &cell, double sf, int level)
           double xw = sf * w * 0.5 * rx * n, yw = sf * w * 0.5 * ry * n;
           double xh = -sf * h * 0.5 * ry * n, yh = sf * h * 0.5 * rx * n;
 
+          db::Point c (sf * x, sf * y);
+
           db::Point points [4];
-          points [0] = db::Point (x - xw - xh, y - yw - yh);
+          points [0] = c + db::Vector (-xw - xh, -yw - yh);
-          points [1] = db::Point (x - xw + xh, y - yw + yh);
+          points [1] = c + db::Vector (-xw + xh, -yw + yh);
-          points [2] = db::Point (x + xw + xh, y + yw + yh);
+          points [2] = c + db::Vector (xw + xh, yw + yh);
-          points [3] = db::Point (x + xw - xh, y + yw - yh);
+          points [3] = c + db::Vector (xw - xh, yw - yh);
 
           db::Polygon p;
           p.assign_hull (points, points + 4);

src/plugins/streamers/cif/unit_tests/dbCIFReader.cc

@@ -189,3 +189,8 @@ TEST(lasi)
   run_test (_this, tl::testsrc (), "lasi.cif.gz", "lasi_au.gds.gz");
 }
 
+//  Issue #305
+TEST(rot_boxes)
+{
+  run_test (_this, tl::testsrc (), "issue_305.cif", "issue_305_au.gds");
+}

testdata/cif/issue_305.cif

@@ -0,0 +1,18 @@
+DS 1 10 1;
+9 test;
+L TEST;
+
+(Origin marker)
+B 1 1 0,0;
+
+(Draw two offset boxes without rotation)
+B 10 1 20,-10;
+B 10 1 20,10;
+
+(Try drawing the same boxes with rotation)
+(They appear nearly centered on the origin in Klayout, the offset is wrong?)
+B 10 1 20,-10 5,-2;
+B 10 1 20,10 5,2;
+
+DF;
+E