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@springmeyer
springmeyer / node-mapnik-install.md
Created February 12, 2014 18:41
testing node-mapnik install via node-pre-gyp binaries
View node-mapnik-install.md

install protoc

For now you still need the protobuf depedency installed.

For OS X do:

brew install protobuf

The protoc command should then be on your path.

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@springmeyer
springmeyer / gist:9630512
Created March 18, 2014 21:51
g++4.8 / gdal warning
View gist:9630512
/home/ubuntu/mapnik-packaging/osx/out/build-cpp11-libstdcpp-gcc-x86_64/lib/libgdal.a(cpl_minixml.o): In function `_ZL19CPLSerializeXMLNodePK10CPLXMLNodeiPPcPjS4_.constprop.4':
cpl_minixml.cpp:(.text+0xf57): warning: memset used with constant zero length parameter; this could be due to transposed parameters
@springmeyer
springmeyer / gist:9675127
Created March 20, 2014 22:16
libosmium osm-testdata output
View gist:9675127
./testdata-multipolygon ../../../osm-testdata/grid/data/all.osm
Pass 1...
relations: 57
node members: 0
way members: 136
relation members: 0
Pass 1 done
Pass 2...
Build relation id()=701900 members.size()=2 segments.size()=4
@springmeyer
springmeyer / 14_10083_6161.vector.pbf.z
Last active August 29, 2015 13:57
AGG line-join:round triangle artifacts bug testcase
View agg_math_stroke.h.diff
diff --git a/deps/agg/include/agg_math_stroke.h b/deps/agg/include/agg_math_stroke.h
index 4806dcd..7ba45f6 100644
--- a/deps/agg/include/agg_math_stroke.h
+++ b/deps/agg/include/agg_math_stroke.h
@@ -22,6 +22,7 @@
#include "agg_math.h"
#include "agg_vertex_sequence.h"
+#include <mapnik/debug.hpp>
@springmeyer
springmeyer / README.md
Last active August 29, 2015 13:57
numerical instability in collinear segments
View README.md

Results in a massive dx2 value which breaks return values for dx and dy:

Output is:

$ ./calc-intersection-test
m_width * (v1.y - v0.y): 0.200000000023408
m_width * (v2.y - v1.y): 0.300000000000018
dx2: 9771986970684.640625000000000

1 9771986970692.2246093750000000 8934388088183.3027343750000000

@springmeyer
springmeyer / agg_vcgen_stroke.cpp.diff
Created March 22, 2014 02:08
agg_vcgen_stroke.cpp diff to avoid bogus line joins from numerical instability with nearly collinear segments (https://github.com/mapnik/mapnik/issues/2186)
View agg_vcgen_stroke.cpp.diff
diff --git a/deps/agg/src/agg_vcgen_stroke.cpp b/deps/agg/src/agg_vcgen_stroke.cpp
index 3ee336f..f00014f 100644
--- a/deps/agg/src/agg_vcgen_stroke.cpp
+++ b/deps/agg/src/agg_vcgen_stroke.cpp
@@ -20,6 +20,7 @@
#include "agg_vcgen_stroke.h"
#include "agg_shorten_path.h"
+const static double eps = 1e-2;
namespace agg
@springmeyer
springmeyer / failures.txt
Created April 1, 2014 03:38
visual test failures with mapnik 2.3.x and 'vertex_dist_epsilon:1e-5' https://github.com/mapnik/mapnik/issues/2196
View failures.txt
Visual rendering: 19 failed / 776 passed
1) 1104 different pixels:
/tmp/mapnik-visual-images/image-filters-multi-blur-inflate-512-512-1.0-agg.png (actual)
tests/visual_tests/images/image-filters-multi-blur-inflate-512-512-1.0-agg-reference.png (expected)
2) 180 different pixels:
/tmp/mapnik-visual-images/image-filters-multi-blur-inflate-512-512-2.0-agg.png (actual)
tests/visual_tests/images/image-filters-multi-blur-inflate-512-512-2.0-agg-reference.png (expected)
3) 68 different pixels:
/tmp/mapnik-visual-images/lines-5-800-800-1.0-agg.png (actual)
tests/visual_tests/images/lines-5-800-800-1.0-agg-reference.png (expected)
View gist:9925729
Process: Python [10242]
Path: /System/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python
Identifier: Python
Version: 2.7.5 (2.7.5)
Code Type: X86-64 (Native)
Parent Process: sh [10221]
Responsible: Terminal [78893]
User ID: 501
PlugIn Path: /opt/mapnik/*/_mapnik.so