Map with German electoral districts: Difference between revisions

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Line 15: Line 15:
     i, col = 0;
     i, col = 0;
      
      
brd = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[minX-1000,maxY+1000,maxX+1000,minY-1000],
brd = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[minX-1000,maxY+1000,maxX+1000,minY-1000],keepaspectratio:true});
                                    keepaspectratio:true});


for(i=0;i<len;i++) {
for(i=0;i<len;i++) {
Line 41: Line 40:
             c.push(new JXG.Coords(JXG.COORDS_BY_USER, [1*a[0], 1*a[1]], brd));
             c.push(new JXG.Coords(JXG.COORDS_BY_USER, [1*a[0], 1*a[1]], brd));
         }
         }
         c = brd.renderer.RamenDouglasPeuker(c,1.3);
         c = JXG.Math.Numerics.RamerDouglasPeuker(c,1.3);
         len = c.length;
         len = c.length;
         for (i=0;i<len;i++) {
         for (i=0;i<len;i++) {
Line 47: Line 46:
             y.push(c[i].usrCoords[2]);
             y.push(c[i].usrCoords[2]);
         }
         }
         graph = brd.createElement('curve', [x,y],  
         graph = brd.create('curve', [x,y],  
                     {fillColor:JXG.hsv2rgb(col++,0.6,0.9),
                     {fillColor:JXG.hsv2rgb(0.5*(col++),0.5,0.9),
                     highlightFillColor:'yellow',
                     highlightFillColor:'yellow',
                     strokeWidth:1,strokeColor:'black',highlightStrokeColor:'black'});
                     strokeWidth:1,strokeColor:'black',highlightStrokeColor:'black'});
         if (k==0) {
         if (k==0) {
             JXG.addEvent(graph.rendNode, 'mouseover', (function(g){ return function(){g.highlight(); wahlkreisNode.nodeValue=area[1];};})(graph), graph);
             JXG.addEvent(graph.rendNode, 'mouseover', function(){graph.nohcol = graph.visProp.fillcolor; graph.setAttribute({fillColor: 'yellow'});}, graph);
             JXG.addEvent(graph.rendNode, 'mouseout', (function(g){ return function(){g.noHighlight();};})(graph), graph);
             JXG.addEvent(graph.rendNode, 'mouseout', function(){graph.setAttribute({fillColor: graph.nohcol});}, graph);
         }
         }
         graph.hasPoint = function(){return false; };
         graph.hasPoint = function(){return false; };
Line 61: Line 60:
function final() {
function final() {
     brd.unsuspendUpdate();
     brd.unsuspendUpdate();
}
//Copyright 2009 Nicholas C. Zakas. All rights reserved.
//MIT Licensed
function timedChunk(items, process, context, callback){
    var todo = items.concat();  //create a clone of the original
    setTimeout(function(){
        var start = +new Date();
        do {
            process.call(context, todo.shift());
        } while (todo.length > 0 && (+new Date() - start < 300));
        if (todo.length > 0){
            setTimeout(arguments.callee, 1);
        } else {
            callback(items);
        }
    }, 1);
}
}


brd.suspendUpdate();
brd.suspendUpdate();
timedChunk(points, createCurve, null, final);
JXG.timedChunk(points, createCurve, null, final);
</jsxgraph>
</jsxgraph>


Line 95: Line 77:
<script type="text/javascript" src="/ajax/germany.js"></script>
<script type="text/javascript" src="/ajax/germany.js"></script>
<div id="wahlkreis">&nbsp;</div>
<div id="wahlkreis">&nbsp;</div>
<jsxgraph width="500" height="700">
</source>
<source lang="javascript">
var minX =-289319.4,
var minX =-289319.4,
     maxY = 6827620,
     maxY = 6827620,
Line 107: Line 90:
     i, col = 0;
     i, col = 0;
      
      
brd = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[minX-1000,maxY+1000,maxX+1000,minY-1000],
brd = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[minX-1000,maxY+1000,maxX+1000,minY-1000],keepaspectratio:true});
                                    keepaspectratio:true});


for(i=0;i<len;i++) {
for(i=0;i<len;i++) {
Line 133: Line 115:
             c.push(new JXG.Coords(JXG.COORDS_BY_USER, [1*a[0], 1*a[1]], brd));
             c.push(new JXG.Coords(JXG.COORDS_BY_USER, [1*a[0], 1*a[1]], brd));
         }
         }
         c = brd.renderer.RamenDouglasPeuker(c,1.3);
         c = JXG.Math.Numerics.RamerDouglasPeuker(c,1.3);
         len = c.length;
         len = c.length;
         for (i=0;i<len;i++) {
         for (i=0;i<len;i++) {
Line 139: Line 121:
             y.push(c[i].usrCoords[2]);
             y.push(c[i].usrCoords[2]);
         }
         }
         graph = brd.createElement('curve', [x,y],  
         graph = brd.create('curve', [x,y],  
                     {fillColor:JXG.hsv2rgb(col++,0.6,0.9),
                     {fillColor:JXG.hsv2rgb(0.5*(col++),0.5,0.9),
                     highlightFillColor:'yellow',
                     highlightFillColor:'yellow',
                     strokeWidth:1,strokeColor:'black',highlightStrokeColor:'black'});
                     strokeWidth:1,strokeColor:'black',highlightStrokeColor:'black'});
         if (k==0) {
         if (k==0) {
             JXG.addEvent(graph.rendNode, 'mouseover', (function(g){ return function(){g.highlight(); wahlkreisNode.nodeValue=area[1];};})(graph), graph);
             JXG.addEvent(graph.rendNode, 'mouseover', function(){graph.nohcol = graph.visProp.fillcolor; graph.setAttribute({fillColor: 'yellow'});}, graph);
             JXG.addEvent(graph.rendNode, 'mouseout', (function(g){ return function(){g.noHighlight();};})(graph), graph);
             JXG.addEvent(graph.rendNode, 'mouseout', function(){graph.setAttribute({fillColor: graph.nohcol});}, graph);
         }
         }
         graph.hasPoint = function(){return false; };
         graph.hasPoint = function(){return false; };
     }
     }
}
//Copyright 2009 Nicholas C. Zakas. All rights reserved.
//MIT Licensed
function timedChunk(items, process, context, callback){
    var todo = items.concat();  //create a clone of the original
    setTimeout(function(){
        var start = +new Date();
        do {
            process.call(context, todo.shift());
        } while (todo.length > 0 && (+new Date() - start < 300));
        if (todo.length > 0){
            setTimeout(arguments.callee, 1);
        } else {
            callback(items);
        }
    }, 1);
}
}


brd.suspendUpdate();
brd.suspendUpdate();
timedChunk(points, createCurve, null, final);
JXG.timedChunk(points, createCurve, null, final);
</jsxgraph>
 
</source>
</source>


[[Category:Examples]]
[[Category:Examples]]
[[Category:Charts]]
[[Category:Charts]]

Latest revision as of 13:33, 3 March 2021

 

For a more elaborate version see http://vis.uell.net/wahlatlas/.

© Bundeswahlleiter, Statistisches Bundesamt, Wiesbaden 2008, Wahlkreiskarte für die Wahl zum 17. Deutschen Bundestag

Geoinformationen © Bundesamt für Kartographie und Geodäsie www.bkg.bund.de


The underlying JavaScript code

<script type="text/javascript" src="/ajax/germany.js"></script>
<div id="wahlkreis">&nbsp;</div>

var minX =-289319.4,
    maxY = 6827620,
    maxX = 351315.7,
    minY = 5960587,
    brd,
    wahlkreisNode = document.getElementById('wahlkreis').firstChild,    
    points = [],
    len = data.length, // from germany.js
    lastWk = null,
    i, col = 0;
    
brd = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[minX-1000,maxY+1000,maxX+1000,minY-1000],keepaspectratio:true});

for(i=0;i<len;i++) {
    if(i%6==1) {
        lastWk = data[i];
    }
    else if(i%6 == 5) {
        points.push([data[i],lastWk]);
    }
}

function createCurve(area)  {
    var compos = area[0].split(';'), // Connected component
        x = [], y = [],
        c = [], num, i, a, graph, k, a;
        
    num = compos.length;
    for (k=0;k<num;k++) {
        x = []; y = []; c = [];
        xy = compos[k].split(',');
        len = xy.length;
        for(i=0;i<len;i++) {
            a = xy[i].split(' ');
            c.push(new JXG.Coords(JXG.COORDS_BY_USER, [1*a[0], 1*a[1]], brd));
        }
        c = JXG.Math.Numerics.RamerDouglasPeuker(c,1.3);
        len = c.length;
        for (i=0;i<len;i++) {
            x.push(c[i].usrCoords[1]);
            y.push(c[i].usrCoords[2]);
        }
        graph = brd.create('curve', [x,y], 
                    {fillColor:JXG.hsv2rgb(0.5*(col++),0.5,0.9),
                     highlightFillColor:'yellow',
                     strokeWidth:1,strokeColor:'black',highlightStrokeColor:'black'});
        if (k==0) {
            JXG.addEvent(graph.rendNode, 'mouseover', function(){graph.nohcol = graph.visProp.fillcolor; graph.setAttribute({fillColor: 'yellow'});}, graph);
            JXG.addEvent(graph.rendNode, 'mouseout', function(){graph.setAttribute({fillColor: graph.nohcol});}, graph);
        }
        graph.hasPoint = function(){return false; };
    }
}

brd.suspendUpdate();
JXG.timedChunk(points, createCurve, null, final);
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