Merge remote-tracking branch 'origin/unstable' into testing

[gpl/argeo-suite.git] / org.argeo.app.core / src / org / argeo / app / geo / GeoToSvg.java

diff --git a/org.argeo.app.core/src/org/argeo/app/geo/GeoToSvg.java b/org.argeo.app.core/src/org/argeo/app/geo/GeoToSvg.java
new file mode 100644 (file)
index 0000000..abb5b39
--- /dev/null
+++ b/org.argeo.app.core/src/org/argeo/app/geo/GeoToSvg.java
@@ -0,0 +1,69 @@
+package org.argeo.app.geo;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.Writer;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+/** Converts a geographical feature to an SVG. */
+public class GeoToSvg {
+       public void convertGeoJsonToSvg(Path source, Path target) {
+               ObjectMapper objectMapper = new ObjectMapper();
+               try (InputStream in = Files.newInputStream(source);
+                               Writer out = Files.newBufferedWriter(target, StandardCharsets.UTF_8)) {
+                       JsonNode tree = objectMapper.readTree(in);
+                       JsonNode coord = tree.get("features").get(0).get("geometry").get("coordinates");
+                       double ratio = 100;
+                       double minX = Double.POSITIVE_INFINITY;
+                       double maxX = Double.NEGATIVE_INFINITY;
+                       double minY = Double.POSITIVE_INFINITY;
+                       double maxY = Double.NEGATIVE_INFINITY;
+                       List<String> shapes = new ArrayList<>();
+                       for (JsonNode shape : coord) {
+                               StringBuffer sb = new StringBuffer();
+                               sb.append("<polyline style=\"stroke-width:0.00000003;stroke:#000000;\" points=\"");
+                               for (JsonNode latlng : shape) {
+                                       double lat = latlng.get(0).asDouble();
+                                       double y = lat * ratio;
+                                       if (y < minY)
+                                               minY = y;
+                                       if (y > maxY)
+                                               maxY = y;
+                                       double lng = latlng.get(1).asDouble();
+                                       double x = lng * ratio;
+                                       if (x < minX)
+                                               minX = x;
+                                       if (x > maxX)
+                                               maxX = x;
+                                       sb.append(y + "," + x + " ");
+                               }
+                               sb.append("\">");
+                               sb.append("</polyline>\n");
+                               shapes.add(sb.toString());
+                       }
+
+                       double width = maxX - minX;
+                       double height = maxY - minY;
+                       out.write("<svg xmlns=\"http://www.w3.org/2000/svg\"\n");
+                       out.write(" width=\"" + (int) (width * 1000) + "\"\n");
+                       out.write(" height=\"" + (int) (height * 1000) + "\"\n");
+                       out.write(" viewBox=\"" + minX + "," + minY + "," + width + "," + height + "\"\n");
+                       out.write(">\n");
+                       for (String shape : shapes) {
+                               out.write(shape);
+                               out.write("\n");
+                       }
+                       out.write("</svg>");
+               } catch (IOException e) {
+                       throw new RuntimeException("Cannot convert " + source + " to " + target, e);
+               }
+       }
+
+}