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path: root/misc/openlayers/examples/simplify-linestring.js
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Diffstat (limited to 'misc/openlayers/examples/simplify-linestring.js')
-rw-r--r--misc/openlayers/examples/simplify-linestring.js599
1 files changed, 599 insertions, 0 deletions
diff --git a/misc/openlayers/examples/simplify-linestring.js b/misc/openlayers/examples/simplify-linestring.js
new file mode 100644
index 0000000..3f4c6f6
--- /dev/null
+++ b/misc/openlayers/examples/simplify-linestring.js
@@ -0,0 +1,599 @@
+// global variables
+var map, map2;
+
+// wrap the instanciation code in an anonymous function that gets executed
+// immedeately
+(function(){
+ // style the vectorlayer
+ var styleMap = new OpenLayers.StyleMap({
+ 'default': new OpenLayers.Style({
+ strokeColor: "#333333",
+ strokeWidth: 1.2,
+ strokeOpacity: 1
+ })
+ });
+
+ // the vectorlayer
+ var vectorlayer = new OpenLayers.Layer.Vector('Vectorlayer', {
+ isBaseLayer: true,
+ styleMap: styleMap
+ });
+
+ var original = OpenLayers.Geometry.fromWKT("LINESTRING(" +
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+ );
+ vectorlayer.addFeatures([new OpenLayers.Feature.Vector(original)]);
+ var maxExtent = vectorlayer.getDataExtent();
+ // instanciate the map
+ map = new OpenLayers.Map("map", {
+ fractionalZoom: true,
+ maxExtent: maxExtent,
+ layers: [vectorlayer]
+ });
+ map.zoomToMaxExtent();
+ map.events.register('moveend', map, function(){
+ map2.setCenter(map.getCenter(), map.getZoom());
+ });
+
+
+ var vectorlayer2 = new OpenLayers.Layer.Vector('Vectorlayer simplified', {
+ isBaseLayer: true,
+ styleMap: styleMap
+ });
+
+ map2 = new OpenLayers.Map("map-simplify", {
+ fractionalZoom: true,
+ maxExtent: maxExtent,
+ controls: [],
+ layers: [vectorlayer2]
+ });
+ map2.zoomToExtent(maxExtent);
+
+ // Control behaviour
+ var lastValue = 0.1;
+ var simplify = function() {
+ var min = 0;
+ var max = 1;
+ var givenVal= parseFloat(document.getElementById('tolerance').value);
+ var useVal = lastValue;
+ if (!isNaN(givenVal)) {
+ if (givenVal >= min && givenVal <= max) {
+ useVal = givenVal;
+ } else {
+ useVal = (givenVal < min) ? min : max;
+ }
+ }
+ document.getElementById('tolerance').value = useVal;
+ vectorlayer2.removeFeatures(vectorlayer2.features);
+ var newLineString = original.simplify(useVal);
+ vectorlayer2.addFeatures([new OpenLayers.Feature.Vector(newLineString)]);
+ var originalVerticesCnt = original.getVertices().length;
+ var simplifiedVerticesCnt = newLineString.getVertices().length;
+ var infotxt = '<ul><li>Original LineString: <strong>';
+ infotxt += originalVerticesCnt + ' vertices</strong></li>';
+ infotxt += ' <li>Simplified geometry: <strong>' + simplifiedVerticesCnt + ' vertices</strong></li>';
+ infotxt += ' <li>Decreased by <strong>' + (((originalVerticesCnt-simplifiedVerticesCnt)/originalVerticesCnt)*100).toFixed(2) + ' per cent</strong></li></ul>';
+ document.getElementById('info').innerHTML = infotxt;
+ lastValue = useVal;
+ };
+ document.getElementById('tolerance').value = lastValue;
+ document.getElementById('simplify').onclick = simplify;
+ simplify();
+
+ var animationInterval;
+ var animationHandler = function(){
+ if (this.value === 'Start animation') {
+ document.getElementById('simplify').disabled = true;
+ document.getElementById('animation').value = "Stop animation";
+ animationInterval = window.setInterval(function(){
+ var tolerance = parseFloat(document.getElementById('tolerance').value);
+ if (tolerance < 1) {
+ tolerance+=0.02;
+ } else {
+ tolerance = 0.02;
+ }
+ document.getElementById('tolerance').value = tolerance.toFixed(2);
+ simplify();
+ }, 500);
+ simplify();
+ } else {
+ if (animationInterval) {
+ window.clearInterval(animationInterval);
+ }
+ document.getElementById('simplify').disabled = false;
+ document.getElementById('animation').value = "Start animation";
+ }
+ };
+ document.getElementById('animation').onclick = animationHandler;
+})();
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-22 14:16:58 +0000