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| Viewing file: Select action/file-type: /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for
* full list of contributors). Published under the Clear BSD license.
* See http://svn.openlayers.org/trunk/openlayers/license.txt for the
* full text of the license. */
/**
* @requires OpenLayers/Geometry/Collection.js
* @requires OpenLayers/Geometry/LineString.js
*/
/**
* Class: OpenLayers.Geometry.MultiLineString
* A MultiLineString is a geometry with multiple <OpenLayers.Geometry.LineString>
* components.
*
* Inherits from:
* - <OpenLayers.Geometry.Collection>
* - <OpenLayers.Geometry>
*/
OpenLayers.Geometry.MultiLineString = OpenLayers.Class(
OpenLayers.Geometry.Collection, {
/**
* Property: componentTypes
* {Array(String)} An array of class names representing the types of
* components that the collection can include. A null value means the
* component types are not restricted.
*/
componentTypes: ["OpenLayers.Geometry.LineString"],
/**
* Constructor: OpenLayers.Geometry.MultiLineString
* Constructor for a MultiLineString Geometry.
*
* Parameters:
* components - {Array(<OpenLayers.Geometry.LineString>)}
*
*/
initialize: function(components) {
OpenLayers.Geometry.Collection.prototype.initialize.apply(this,
arguments);
},
/**
* Method: split
* Use this geometry (the source) to attempt to split a target geometry.
*
* Parameters:
* target - {<OpenLayers.Geometry>} The target geometry.
* options - {Object} Properties of this object will be used to determine
* how the split is conducted.
*
* Valid options:
* mutual - {Boolean} Split the source geometry in addition to the target
* geometry. Default is false.
* edge - {Boolean} Allow splitting when only edges intersect. Default is
* true. If false, a vertex on the source must be within the tolerance
* distance of the intersection to be considered a split.
* tolerance - {Number} If a non-null value is provided, intersections
* within the tolerance distance of an existing vertex on the source
* will be assumed to occur at the vertex.
*
* Returns:
* {Array} A list of geometries (of this same type as the target) that
* result from splitting the target with the source geometry. The
* source and target geometry will remain unmodified. If no split
* results, null will be returned. If mutual is true and a split
* results, return will be an array of two arrays - the first will be
* all geometries that result from splitting the source geometry and
* the second will be all geometries that result from splitting the
* target geometry.
*/
split: function(geometry, options) {
var results = null;
var mutual = options && options.mutual;
var splits, sourceLine, sourceLines, sourceSplit, targetSplit;
var sourceParts = [];
var targetParts = [geometry];
for(var i=0, len=this.components.length; i<len; ++i) {
sourceLine = this.components[i];
sourceSplit = false;
for(var j=0; j < targetParts.length; ++j) {
splits = sourceLine.split(targetParts[j], options);
if(splits) {
if(mutual) {
sourceLines = splits[0];
for(var k=0, klen=sourceLines.length; k<klen; ++k) {
if(k===0 && sourceParts.length) {
sourceParts[sourceParts.length-1].addComponent(
sourceLines[k]
);
} else {
sourceParts.push(
new OpenLayers.Geometry.MultiLineString([
sourceLines[k]
])
);
}
}
sourceSplit = true;
splits = splits[1];
}
if(splits.length) {
// splice in new target parts
splits.unshift(j, 1);
Array.prototype.splice.apply(targetParts, splits);
break;
}
}
}
if(!sourceSplit) {
// source line was not hit
if(sourceParts.length) {
// add line to existing multi
sourceParts[sourceParts.length-1].addComponent(
sourceLine.clone()
);
} else {
// create a fresh multi
sourceParts = [
new OpenLayers.Geometry.MultiLineString(
sourceLine.clone()
)
];
}
}
}
if(sourceParts && sourceParts.length > 1) {
sourceSplit = true;
} else {
sourceParts = [];
}
if(targetParts && targetParts.length > 1) {
targetSplit = true;
} else {
targetParts = [];
}
if(sourceSplit || targetSplit) {
if(mutual) {
results = [sourceParts, targetParts];
} else {
results = targetParts;
}
}
return results;
},
/**
* Method: splitWith
* Split this geometry (the target) with the given geometry (the source).
*
* Parameters:
* geometry - {<OpenLayers.Geometry>} A geometry used to split this
* geometry (the source).
* options - {Object} Properties of this object will be used to determine
* how the split is conducted.
*
* Valid options:
* mutual - {Boolean} Split the source geometry in addition to the target
* geometry. Default is false.
* edge - {Boolean} Allow splitting when only edges intersect. Default is
* true. If false, a vertex on the source must be within the tolerance
* distance of the intersection to be considered a split.
* tolerance - {Number} If a non-null value is provided, intersections
* within the tolerance distance of an existing vertex on the source
* will be assumed to occur at the vertex.
*
* Returns:
* {Array} A list of geometries (of this same type as the target) that
* result from splitting the target with the source geometry. The
* source and target geometry will remain unmodified. If no split
* results, null will be returned. If mutual is true and a split
* results, return will be an array of two arrays - the first will be
* all geometries that result from splitting the source geometry and
* the second will be all geometries that result from splitting the
* target geometry.
*/
splitWith: function(geometry, options) {
var results = null;
var mutual = options && options.mutual;
var splits, targetLine, sourceLines, sourceSplit, targetSplit, sourceParts, targetParts;
if(geometry instanceof OpenLayers.Geometry.LineString) {
targetParts = [];
sourceParts = [geometry];
for(var i=0, len=this.components.length; i<len; ++i) {
targetSplit = false;
targetLine = this.components[i];
for(var j=0; j<sourceParts.length; ++j) {
splits = sourceParts[j].split(targetLine, options);
if(splits) {
if(mutual) {
sourceLines = splits[0];
if(sourceLines.length) {
// splice in new source parts
sourceLines.unshift(j, 1);
Array.prototype.splice.apply(sourceParts, sourceLines);
j += sourceLines.length - 2;
}
splits = splits[1];
if(splits.length === 0) {
splits = [targetLine.clone()];
}
}
for(var k=0, klen=splits.length; k<klen; ++k) {
if(k===0 && targetParts.length) {
targetParts[targetParts.length-1].addComponent(
splits[k]
);
} else {
targetParts.push(
new OpenLayers.Geometry.MultiLineString([
splits[k]
])
);
}
}
targetSplit = true;
}
}
if(!targetSplit) {
// target component was not hit
if(targetParts.length) {
// add it to any existing multi-line
targetParts[targetParts.length-1].addComponent(
targetLine.clone()
);
} else {
// or start with a fresh multi-line
targetParts = [
new OpenLayers.Geometry.MultiLineString([
targetLine.clone()
])
];
}
}
}
} else {
results = geometry.split(this);
}
if(sourceParts && sourceParts.length > 1) {
sourceSplit = true;
} else {
sourceParts = [];
}
if(targetParts && targetParts.length > 1) {
targetSplit = true;
} else {
targetParts = [];
}
if(sourceSplit || targetSplit) {
if(mutual) {
results = [sourceParts, targetParts];
} else {
results = targetParts;
}
}
return results;
},
CLASS_NAME: "OpenLayers.Geometry.MultiLineString"
});
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