e9e2aec77d
git-svn-id: http://svn.openlayers.org/trunk/openlayers@10969 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
600 lines
19 KiB
JavaScript
600 lines
19 KiB
JavaScript
// global variables
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var map, map2;
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// wrap the instanciation code in an anonymous function that gets executed
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// immedeately
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(function(){
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// style the vectorlayer
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var styleMap = new OpenLayers.StyleMap({
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'default': new OpenLayers.Style({
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strokeColor: "#333333",
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strokeWidth: 1.2,
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strokeOpacity: 1
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})
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});
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// the vectorlayer
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var vectorlayer = new OpenLayers.Layer.Vector('Vectorlayer', {
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isBaseLayer: true,
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styleMap: styleMap
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});
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"2.396376 8.837933," +
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"2.408946 8.879078," +
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"2.432218 8.894878," +
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"2.414995 8.963022," +
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"2.390961 8.983722," +
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"2.340091 8.969389," +
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"2.332091 8.946244," +
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"2.340091 8.927722," +
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"2.332091 8.912289," +
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"2.316093 8.904067," +
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"2.288975 8.861244," +
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"2.247727 8.856233," +
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"2.233180 8.861889," +
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"2.209436 8.859233," +
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"2.277548 8.869600," +
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"2.247727 8.925256," +
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"2.225734 8.920756," +
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"2.214352 8.931822," +
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"2.031530 9.607422," +
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"1.835167 9.695656," +
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"1.746196 9.760744," +
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"1.667446 9.789667," +
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"1.575400 9.797622," +
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"1.562104 9.828722," +
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"1.531422 9.846800," +
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"1.415859 9.888744," +
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"1.315206 9.942167," +
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"1.175573 10.083667," +
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"1.147394 10.090267," +
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"1.118064 10.086567," +
|
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"0.990883 9.998400," +
|
|
"0.778930 9.990856," +
|
|
"0.592924 10.033144," +
|
|
"0.507490 10.125422," +
|
|
"0.419562 10.320811," +
|
|
"0.375403 10.344533," +
|
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"0.276464 10.431189," +
|
|
"0.220170 10.534911," +
|
|
"0.181271 10.571000," +
|
|
"0.153745 10.620156," +
|
|
"0.114973 10.653889," +
|
|
"0.103274 10.707756," +
|
|
"0.097914 10.761511," +
|
|
"0.076256 10.811522," +
|
|
"0.061935 10.867833," +
|
|
"0.000000 10.960167)"
|
|
);
|
|
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;
|
|
})();
|