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/*
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License: LGPL as per: http://www.gnu.org/copyleft/lesser.html
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Dependancies: Context
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$Id$
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*/
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// Ensure this object's dependancies are loaded.
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mapbuilder.loadScript(baseDir+"/tool/ToolBase.js");
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mapbuilder.loadScript(baseDir+"/model/Proj.js");
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/**
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* Controller for the locator map widget.
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* Specify the context that this widget follows by setting the targetModel
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* property in config.
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* This will display the AOI of the target model using the AoiBox tool.
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* This will also process mouse events (click and dragbox) to recenter the
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* target model and includes coordinate projection transformations if required.
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* Checking for extent limits is not yet implemented.
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* @constructor
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* @base ToolBase
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* @author Adair
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* @param toolNode The tool node from the config document for this tool
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* @param model Reference to the widget object that creates this tool
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*/
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function ZoomToAoi(toolNode, model) {
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ToolBase.apply(this, new Array(toolNode, model));
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/**
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* Target model loadModel change listener. This resets the projection objects
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* if the target model changes.
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* @param tool Pointer to this ZoomToAoi object.
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*/
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this.initProj = function( toolRef ) {
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if( toolRef.model.doc && toolRef.targetModel.doc ) {
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if ( toolRef.model.getSRS() != toolRef.targetModel.getSRS() ) {
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toolRef.model.proj = new Proj( toolRef.model.getSRS() );
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toolRef.targetModel.proj = new Proj( toolRef.targetModel.getSRS() );
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}
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}
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}
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this.setListeners = function( toolRef ) {
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toolRef.model.addListener( "loadModel", toolRef.initProj, toolRef );
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toolRef.targetModel.addListener( "loadModel", toolRef.initProj, toolRef );
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toolRef.initProj( toolRef );
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}
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this.model.addListener( "loadModel", this.setListeners, this);
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/**
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* Target model bbox change listener. This sets this model's AOI to be the
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* same as the target model bounding box.
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* @param tool Pointer to this ZoomToAoi object.
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*/
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this.showTargetAoi = function( tool ) {
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if( tool.targetModel.doc ) {
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var bbox = tool.targetModel.getBoundingBox();
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var ul = new Array(bbox[0],bbox[3]);
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var lr = new Array(bbox[2],bbox[1]);
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if ( tool.model.getSRS() != tool.targetModel.getSRS() ) {
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ul = tool.targetModel.proj.Inverse( ul ); //to lat-long
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lr = tool.targetModel.proj.Inverse( lr );
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if (ul[0]>lr[0]) ul[0] = ul[0]-360.0; //make sure ul is left of lr
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ul = tool.model.proj.Forward( ul ); //back to XY
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lr = tool.model.proj.Forward( lr );
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}
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tool.model.setParam("aoi", new Array(ul, lr) );
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}
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}
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this.firstInit = function(tool) {
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tool.targetModel.addListener( "loadModel", tool.showTargetAoi, tool );
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tool.targetModel.addListener( "bbox", tool.showTargetAoi, tool );
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tool.showTargetAoi(tool);
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}
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this.model.addListener( "loadModel", this.firstInit, this );
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/**
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* Process a mouse up action. This will recenter the target model's bbox
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* to be equal to this model's AOI.
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* @param tool Pointer to this ZoomToAoi object.
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* @param targetNode The node for the enclosing HTML tag for this widget, not used.
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*/
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this.mouseUpHandler = function(tool,targetNode) {
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var bbox = tool.model.getParam("aoi");
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var ul = bbox[0];
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var lr = bbox[1];
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if ( tool.model.getSRS() != tool.targetModel.getSRS() ) {
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//TBD: convert XY to lat/long first
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ul = tool.targetModel.proj.Forward( ul ); //to target XY
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lr = tool.targetModel.proj.Forward( lr );
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}
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if ( ( ul[0]==lr[0] ) && ( ul[1]==lr[1] ) ) {
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tool.targetModel.extent.centerAt( ul, tool.targetModel.extent.res[0] );
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} else {
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tool.targetModel.extent.zoomToBox( ul, lr );
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}
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}
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this.model.addListener('mouseup',this.mouseUpHandler,this);
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}
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