Difference between revisions of "Bearing"

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(Version 2)
Line 50: Line 50:
 
<form>
 
<form>
 
<input type="text" id="degrees2">
 
<input type="text" id="degrees2">
<input type="button" value="set direction" onclick="setDirection()">
+
<input type="button" value="set direction" onclick="setDirection2()">
 
</form>
 
</form>
 
</html>
 
</html>
Line 65: Line 65:
 
             });
 
             });
  
var setDirection = function() {
+
var setDirection2 = function() {
 
   var phi = 1*document.getElementById('degrees2').value*Math.PI/180.0;
 
   var phi = 1*document.getElementById('degrees2').value*Math.PI/180.0;
 
   var r = a.Radius();
 
   var r = a.Radius();
Line 73: Line 73:
 
</jsxgraph>
 
</jsxgraph>
  
 +
===The underlying JavaScript code===
 +
<source lang="html4strict">
 +
<form>
 +
<input type="text" id="degrees">
 +
<input type="button" value="set direction" onclick="setDirection2()">
 +
</form>
 +
</source>
 +
 +
<source lang="javascript">
 +
var brd2 = JXG.JSXGraph.initBoard('box2',{axis:true,boundingbox:[-2,1.5,2,-1.5],keepaspectratio:true});
 +
var p1 = brd2.create('point',[0,0]);
 +
var p2 = brd2.create('point',[1,0]);
 +
var p3 = brd2.create('point',[0,1]);
 +
var a = brd2.create('arc',[p1,p2,p3]);
 +
 +
var q = brd2.create('glider',[0.5,0.5,a],{name:'drag me'}); // global variable
 +
brd2.addHook(function(){
 +
                  document.getElementById('degrees2').value = (Math.atan2(q.Y(),q.X())*180/Math.PI).toFixed(0);
 +
            });
 +
 +
var setDirection2 = function() {
 +
  var phi = 1*document.getElementById('degrees2').value*Math.PI/180.0;
 +
  var r = a.Radius();
 +
  q.moveTo([r*Math.cos(phi),r*Math.sin(phi)]);
 +
 +
}
 +
</source>
  
 
[[Category:Examples]]
 
[[Category:Examples]]

Revision as of 18:32, 16 June 2010

The underlying JavaScript code

<form>
<input type="text" id="degrees">
<input type="button" value="set direction" onclick="setDirection()">
</form>
var brd = JXG.JSXGraph.initBoard('jxgbox',{axis:true,boundingbox:[-2,1.5,2,-1.5],keepaspectratio:true});
var c = brd.create('circle',[[0,0],1]);
var p = brd.create('glider',[-1,0.5,c],{name:'drag me'}); // global variable
brd.addHook(function(){
                  document.getElementById('degrees').value = (Math.atan2(p.Y(),p.X())*180/Math.PI).toFixed(0);
            });

var setDirection = function() {
   var phi = 1*document.getElementById('degrees').value*Math.PI/180.0;
   var r = c.Radius();
   p.moveTo([r*Math.cos(phi),r*Math.sin(phi)]);

}

Version 2

The underlying JavaScript code

<form>
<input type="text" id="degrees">
<input type="button" value="set direction" onclick="setDirection2()">
</form>
var brd2 = JXG.JSXGraph.initBoard('box2',{axis:true,boundingbox:[-2,1.5,2,-1.5],keepaspectratio:true});
var p1 = brd2.create('point',[0,0]);
var p2 = brd2.create('point',[1,0]);
var p3 = brd2.create('point',[0,1]);
var a = brd2.create('arc',[p1,p2,p3]);

var q = brd2.create('glider',[0.5,0.5,a],{name:'drag me'}); // global variable
brd2.addHook(function(){
                  document.getElementById('degrees2').value = (Math.atan2(q.Y(),q.X())*180/Math.PI).toFixed(0);
            });

var setDirection2 = function() {
   var phi = 1*document.getElementById('degrees2').value*Math.PI/180.0;
   var r = a.Radius();
   q.moveTo([r*Math.cos(phi),r*Math.sin(phi)]);

}