Hi Felix,
Please try the attached patch on the original tile and see if it fixes
the problem.
Cheers,
Mark
diff --git a/src/uk/me/parabola/imgfmt/app/trergn/LinePreparer.java b/src/uk/me/parabola/imgfmt/app/trergn/LinePreparer.java
index 122d811..9fb07a2 100644
--- a/src/uk/me/parabola/imgfmt/app/trergn/LinePreparer.java
+++ b/src/uk/me/parabola/imgfmt/app/trergn/LinePreparer.java
@@ -68,7 +68,7 @@ class LinePreparer {
*
* @return A class containing the writen byte stream.
*/
- public BitWriter makeBitStream() {
+ public BitWriter makeBitStream(int minPointsRequired) {
assert xBase >= 0 && yBase >= 0;
@@ -117,12 +117,15 @@ class LinePreparer {
if (extraBit)
bw.put1(false);
+ int numPointsEncoded = 1;
for (int i = 0; i < deltas.length; i+=2) {
int dx = deltas[i];
int dy = deltas[i + 1];
if (dx == 0 && dy == 0)
continue;
+ ++numPointsEncoded;
+
if (log.isDebugEnabled())
log.debug("x delta", dx, "~", xbits);
assert dx >> xbits == 0 || dx >> xbits == -1;
@@ -154,6 +157,10 @@ class LinePreparer {
if (log.isDebugEnabled())
log.debug(bw);
+
+ if(numPointsEncoded < minPointsRequired)
+ return null;
+
return bw;
}
diff --git a/src/uk/me/parabola/imgfmt/app/trergn/Polyline.java b/src/uk/me/parabola/imgfmt/app/trergn/Polyline.java
index b52774c..66a913c 100644
--- a/src/uk/me/parabola/imgfmt/app/trergn/Polyline.java
+++ b/src/uk/me/parabola/imgfmt/app/trergn/Polyline.java
@@ -78,17 +78,17 @@ public class Polyline extends MapObject {
* @param file A reference to the file that should be written to.
*/
public void write(ImgFileWriter file) {
- // If there is nothing to do, then do nothing.
- if (points.size() < 2) {
- log.debug("less than two points, not writing");
- return;
- }
// Prepare for writing by doing all the required calculations.
// Prepare the information that we need.
LinePreparer w = new LinePreparer(this);
- BitWriter bw = w.makeBitStream();
+ int minPointsRequired = (this instanceof Polygon)? 3 : 2;
+ BitWriter bw = w.makeBitStream(minPointsRequired);
+ if(bw == null) {
+ log.warn("Encoded " + ((this instanceof Polygon)? "polygon" : "polyline") + " has less than " + minPointsRequired + " points, discarding");
+ return;
+ }
// The type of feature, also contains a couple of flags hidden inside.
byte b1 = (byte) getType();
@@ -149,6 +149,18 @@ public class Polyline extends MapObject {
int labelOff = getLabel().getOffset();
byte[] extraBytes = getExtTypeExtraBytes();
+ // need to prepare line info before outputing lat/lon
+ LinePreparer w = new LinePreparer(this);
+ int minPointsRequired = (this instanceof Polygon)? 3 : 2;
+ BitWriter bw = w.makeBitStream(minPointsRequired);
+ if(bw == null) {
+ log.warn("Encoded " + ((this instanceof Polygon)? "polygon" : "polyline") + " has less than " + minPointsRequired + " points, discarding");
+ return;
+ }
+ int blen = bw.getLength();
+ assert blen > 1 : "zero length bitstream";
+ assert blen < 0x10000 : "bitstream too long " + blen;
+
if(labelOff != 0)
type |= 0x20; // has label
if(extraBytes != null)
@@ -156,13 +168,6 @@ public class Polyline extends MapObject {
stream.write(type >> 8);
stream.write(type);
- // need to prepare line info before outputing lat/lon
- LinePreparer w = new LinePreparer(this);
- BitWriter bw = w.makeBitStream();
- int blen = bw.getLength();
- assert blen > 1 : "zero length bitstream";
- assert blen < 0x10000 : "bitstream too long " + blen;
-
int deltaLong = getDeltaLong();
int deltaLat = getDeltaLat();
stream.write(deltaLong);
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