Mercurial > dive4elements > gnv-client
comparison gnv-artifacts/ChangeLog @ 450:20a480753ff9
Render labels in vertical cross section charts.
gnv-artifacts/trunk@498 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
|---|---|
| date | Mon, 04 Jan 2010 02:49:42 +0000 |
| parents | c7ca2fce041f |
| children | bc5901bb4525 |
comparison
equal
deleted
inserted
replaced
| 449:c7ca2fce041f | 450:20a480753ff9 |
|---|---|
| 1 2010-01-04 Sascha L. Teichmann <sascha.teichmann@intevation.de> | |
| 2 | |
| 3 * src/main/java/de/intevation/gnv/jfreechart/PolygonSeriesLabelGenerator.java: | |
| 4 New. Interface to generate labels for polygon series. | |
| 5 | |
| 6 * src/main/java/de/intevation/gnv/jfreechart/PolygonRenderer.java: | |
| 7 Added logic to generate and render labels of polygons. | |
| 8 The implemented layout algorithm is greedy. For all | |
| 9 polygons with labels the label is placed on the center of | |
| 10 the ring, which center in terms of the indices of the vertices. | |
| 11 If the bounding box of the label intersects the bounding box | |
| 12 of a an already placed one alternative places are tried. | |
| 13 In level order positions at 1/4, 3/4, 1/8, 3/8, 5/8, 7/8 and | |
| 14 so on are evaluated for non intersections with former placed labels. | |
| 15 This terminates if a free place is found or all index positions | |
| 16 are exhausted. If no free position is found the label is omitted. | |
| 17 | |
| 18 The visual result is okay but could be improved by a more clever | |
| 19 algorithm e.g. tension reduction in the graph of labels. | |
| 20 | |
| 21 TODO: Improve clipping against chart borders. | |
| 22 | |
| 23 * src/main/java/de/intevation/gnv/jfreechart/LevelOrderIndices.java: | |
| 24 New. Little helper class to generate the level order index | |
| 25 traversal used in the label layout. Placed in the jfreechart | |
| 26 package to keep it clean from gnv dependencies. | |
| 27 | |
| 28 * src/main/java/de/intevation/gnv/jfreechart/PolygonPlot.java: | |
| 29 Added some methods to access the domain and range axis and | |
| 30 there edge position. Mainly C&P from JFreeCahrts XYPlot | |
| 31 to ease the coordinate transformation between Java2D and | |
| 32 the value spaces of the chart. Call the label generation | |
| 33 of the polygon renderer. | |
| 34 | |
| 35 * src/main/java/de/intevation/gnv/chart/VerticalCrossSectionChart.java: | |
| 36 Added an implementation of PolygonSeriesLabelGenerator to | |
| 37 generate localized labels for the iso lines. | |
| 38 | |
| 1 2010-01-03 Sascha L. Teichmann <sascha.teichmann@intevation.de> | 39 2010-01-03 Sascha L. Teichmann <sascha.teichmann@intevation.de> |
| 2 | 40 |
| 3 * src/main/java/de/intevation/gnv/chart/VerticalCrossSectionChart.java: | 41 * src/main/java/de/intevation/gnv/chart/VerticalCrossSectionChart.java: |
| 4 Only add colors to scale which are in the chart. | 42 Only add colors to scale which are in the chart. |
| 5 | 43 |