Changeset 11696 in josm for trunk/src/org

Timestamp:

2017-03-07T19:51:27+01:00 (8 years ago)

Author:

michael2402

Message:

Move offset iterator to new file.

Location:

trunk/src/org/openstreetmap/josm/data/osm/visitor/paint

Files:

• OffsetIterator.java (added)
• StyledMapRenderer.java (modified) (4 diffs)

trunk/src/org/openstreetmap/josm/data/osm/visitor/paint/StyledMapRenderer.java

@@ -34 +34 @@
 import java.util.List;
 import java.util.Map;
-import java.util.NoSuchElementException;
 import java.util.Optional;
 import java.util.concurrent.ForkJoinPool;
@@ -97 +96 @@
 
     /**
-     * Iterates over a list of Way Nodes and returns screen coordinates that
-     * represent a line that is shifted by a certain offset perpendicular
-     * to the way direction.
-     *
-     * There is no intention, to handle consecutive duplicate Nodes in a
-     * perfect way, but it should not throw an exception.
-     */
-    private class OffsetIterator implements Iterator<MapViewPoint> {
-
-        private final List<Node> nodes;
-        private final double offset;
-        private int idx;
-
-        private MapViewPoint prev;
-        /* 'prev0' is a point that has distance 'offset' from 'prev' and the
-         * line from 'prev' to 'prev0' is perpendicular to the way segment from
-         * 'prev' to the current point.
-         */
-        private double xPrev0;
-        private double yPrev0;
-
-        OffsetIterator(List<Node> nodes, double offset) {
-            this.nodes = nodes;
-            this.offset = offset;
-            idx = 0;
-        }
-
-        @Override
-        public boolean hasNext() {
-            return idx < nodes.size();
-        }
-
-        @Override
-        public MapViewPoint next() {
-            if (!hasNext())
-                throw new NoSuchElementException();
-
-            MapViewPoint current = getForIndex(idx);
-
-            if (Math.abs(offset) < 0.1d) {
-                idx++;
-                return current;
-            }
-
-            double xCurrent = current.getInViewX();
-            double yCurrent = current.getInViewY();
-            if (idx == nodes.size() - 1) {
-                ++idx;
-                if (prev != null) {
-                    return mapState.getForView(xPrev0 + xCurrent - prev.getInViewX(),
-                                               yPrev0 + yCurrent - prev.getInViewY());
-                } else {
-                    return current;
-                }
-            }
-
-            MapViewPoint next = getForIndex(idx + 1);
-            double dxNext = next.getInViewX() - xCurrent;
-            double dyNext = next.getInViewY() - yCurrent;
-            double lenNext = Math.sqrt(dxNext*dxNext + dyNext*dyNext);
-
-            if (lenNext < 1e-11) {
-                lenNext = 1; // value does not matter, because dy_next and dx_next is 0
-            }
-
-            // calculate the position of the translated current point
-            double om = offset / lenNext;
-            double xCurrent0 = xCurrent + om * dyNext;
-            double yCurrent0 = yCurrent - om * dxNext;
-
-            if (idx == 0) {
-                ++idx;
-                prev = current;
-                xPrev0 = xCurrent0;
-                yPrev0 = yCurrent0;
-                return mapState.getForView(xCurrent0, yCurrent0);
-            } else {
-                double dxPrev = xCurrent - prev.getInViewX();
-                double dyPrev = yCurrent - prev.getInViewY();
-                // determine intersection of the lines parallel to the two segments
-                double det = dxNext*dyPrev - dxPrev*dyNext;
-                double m = dxNext*(yCurrent0 - yPrev0) - dyNext*(xCurrent0 - xPrev0);
-
-                if (Utils.equalsEpsilon(det, 0) || Math.signum(det) != Math.signum(m)) {
-                    ++idx;
-                    prev = current;
-                    xPrev0 = xCurrent0;
-                    yPrev0 = yCurrent0;
-                    return mapState.getForView(xCurrent0, yCurrent0);
-                }
-
-                double f = m / det;
-                if (f < 0) {
-                    ++idx;
-                    prev = current;
-                    xPrev0 = xCurrent0;
-                    yPrev0 = yCurrent0;
-                    return mapState.getForView(xCurrent0, yCurrent0);
-                }
-                // the position of the intersection or intermittent point
-                double cx = xPrev0 + f * dxPrev;
-                double cy = yPrev0 + f * dyPrev;
-
-                if (f > 1) {
-                    // check if the intersection point is too far away, this will happen for sharp angles
-                    double dxI = cx - xCurrent;
-                    double dyI = cy - yCurrent;
-                    double lenISq = dxI * dxI + dyI * dyI;
-
-                    if (lenISq > Math.abs(2 * offset * offset)) {
-                        // intersection point is too far away, calculate intermittent points for capping
-                        double dxPrev0 = xCurrent0 - xPrev0;
-                        double dyPrev0 = yCurrent0 - yPrev0;
-                        double lenPrev0 = Math.sqrt(dxPrev0 * dxPrev0 + dyPrev0 * dyPrev0);
-                        f = 1 + Math.abs(offset / lenPrev0);
-                        double cxCap = xPrev0 + f * dxPrev;
-                        double cyCap = yPrev0 + f * dyPrev;
-                        xPrev0 = cxCap;
-                        yPrev0 = cyCap;
-                        // calculate a virtual prev point which lies on a line that goes through current and
-                        // is perpendicular to the line that goes through current and the intersection
-                        // so that the next capping point is calculated with it.
-                        double lenI = Math.sqrt(lenISq);
-                        double xv = xCurrent + dyI / lenI;
-                        double yv = yCurrent - dxI / lenI;
-
-                        prev = mapState.getForView(xv, yv);
-                        return mapState.getForView(cxCap, cyCap);
-                    }
-                }
-                ++idx;
-                prev = current;
-                xPrev0 = xCurrent0;
-                yPrev0 = yCurrent0;
-                return mapState.getForView(cx, cy);
-            }
-        }
-
-        private MapViewPoint getForIndex(int i) {
-            return mapState.getPointFor(nodes.get(i));
-        }
-
-        @Override
-        public void remove() {
-            throw new UnsupportedOperationException();
-        }
-    }
-
-    /**
      * This stores a style and a primitive that should be painted with that style.
      */
@@ -840 +690 @@
         int dy2 = dy1 + imgHeight;
 
-        OffsetIterator it = new OffsetIterator(way.getNodes(), offset);
+        OffsetIterator it = new OffsetIterator(mapState, way.getNodes(), offset);
         MapViewPath path = new MapViewPath(mapState);
         if (it.hasNext()) {
@@ -1509 +1359 @@
 
         MapViewPoint lastPoint = null;
-        Iterator<MapViewPoint> it = new OffsetIterator(wayNodes, offset);
+        Iterator<MapViewPoint> it = new OffsetIterator(mapState, wayNodes, offset);
         boolean initialMoveToNeeded = true;
         while (it.hasNext()) {